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9控件讲解 ? 在 Windows 下搭建 Android 开发环境 ? Android 项目的目录结构说明 ? 写一个简单的 Hello World 程序 一、在 Windows 下搭建 Android 开发环境 1、安装 JDK (Java Development Kit) http://download.java.net/jdk6/ 2、安装 Android SDK http://developer.android.com/sdk 3、安装 Eclipse http://www.eclipse.org/ 4、打开 Eclipse ,并安装其 Android 插件(ADT) 打开菜单 "Help" -> "Install New Software",在 "Availabe Software" 中加入地址 http://dl-ssl.google.com/android/eclipse/ ,然后安装 ADT(Android Development Tools) 5、新建 Android 项目 "New" -> Android Project,Project Name - 项目名称;Build Target - 编译项目的 SDK 版本;Application name - 程序名称;Package name - 包名;Min SDK Version - 程序所支持的最低 SDK 版本代号(2 对应 1.1,3 对应 1.5,4 对应 1.6) 6、运行 Android 项目 打开菜单 "Run" -> "Run Configurations" -> New launch configuration,设置启动项目名称,在 Android 选项卡中选择启动项目,在 Target 选项卡中设置模拟器 7、创建/使用模拟 SD 卡 创建 SD 卡,运行类似如下命令:mksdcard -l sdcard 512M d:androidsdcard.img 模拟器中使用 SD 卡,在项目配置的 Target 选项卡的 "Additional Emulator Command Line Options" 框中输入类似如下参数:-sdcard d:androidsdcard.img 8、配置模拟器 运行类似如下命令:android create avd --name android15 --target 2。或者直接在菜单 "Window" -> "Android AVD Manager" 中配置模拟器 9、浏览模拟 SD 卡中的内容 调试程序,在 DDMS 中选择 "File Explorer" ,在其中的 sdcard 目录下就是模拟 SD 卡中的内容 10、查看日志 LogCat Window -> Show View -> Other -> Android -> LogCat 11、在模拟器中安装/卸载 apk 安装 apk 运行类似如下命令:adb install name.apk;卸载 apk 运行类似如下命令:adb uninstall packagename(注:这里的参数是需要卸载的包名) 12、反编译 Android 程序 解压 apk 文件,取出其中的 classes.dex 文件,运行类似如下命令:dexdump.exe -d classes.dex > dump.txt(其意思是将 classes.dex dump 出来,并将反编译后的代码保存到指定的文本文件中) 13、人品不好是出现的某些错误的解决办法 如果出现类似如下的错误等 no classfiles specified Conversion to Dalvik format failed with error 1 解决办法:Project -> Clean 出现 Android SDK Content Loader 60% (一直卡在 60%) 解决办法:Project -> 去掉 Build Automatically 前面的勾 14、查看 SDK 源代码 先想办法搞到源代码,如这个地址 http://www.digginmobile.com/android.asp ,然后将其解压到 SDK 根路径下的 sources 文件夹内即可 二、Android 项目的目录结构 1、src - 用于放置源程序 2、gen - 自动生成 R.java 文件,用于引用资源文件(即 res 目录下的数据) 3、assets - 用于放置原始文件,Android 不会对此目录下的文件做任何处理,这是其与 res 目录不同的地方 4、res/drawable - 用于放置图片之类的资源;res/layout - 用于放置布局用的 xml 文件;res/values - 用于放置一些常量数据 5、AndroidManifest.xml - Android 程序的清单文件,相当于配置文件,配置应用程序名称、图标、Activity、Service、Receiver等 三、Hello World 程序 1、res/layout/main.xml 代码 <?xml version="1.0" encoding="utf-8"?> <!-- 设置 ID 的方式:ID前加前缀,@+id/ 引用资源文件内字符串资源的方式:指定的资源名称前加前缀,@string/ --> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" android:id="@+id/layout" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/txt" /> </LinearLayout> 2、res/values/strings.xml 代码 <?xml version="1.0" encoding="utf-8"?> <resources> <string name="hello">layout 直接调用 values 中的字符串</string> <string name="hello2">编程方式调用 values 中的字符串</string> <string name="app_name">webabcd_hello</string> </resources> 3、res/drawable 目录下放置一个名为 icon.png 的图片文件 4、AndroidManifest.xml 代码 <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.webabcd.hello" android:versionCode="1" android:versionName="1.0"> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".Main" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> <uses-sdk android:minSdkVersion="3" /> </manifest> 5、Main.java 代码 package com.webabcd.hello; import android.app.Activity; import android.os.Bundle; import android.widget.LinearLayout; import android.widget.TextView; public class Main extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // 将指定的布局文件作为 Activity 所显示的内容 setContentView(R.layout.main); // 动态地在指定的容器控件上添加新的控件 TextView txt = new TextView(this); txt.setText("动态添加控件"); // setContentView(txt); ((LinearLayout)this.findViewById(R.id.layout)).addView(txt); // 引用资源文件内的内容作为输出内容 TextView txt1 = (TextView)this.findViewById(R.id.txt); txt1.setText(this.getString(R.string.hello2)); } } 四、系出名门Android(2) - 布局(Layout)和菜单(Menu) 介绍 在 Android 中各种布局的应用,以及菜单效果的实现 ? 各种布局方式的应用,FrameLayout, LinearLayout, TableLayout, AbsoluteLayout, RelativeLayout ? 为指定元素配置上下文菜单,为应用程序配置选项菜单,以及多级菜单的实现 1、各种布局方式的演示(FrameLayout, LinearLayout, TableLayout, AbsoluteLayout, RelativeLayout) res/layout/main.xml 代码 <?xml version="1.0" encoding="utf-8"?> <!-- layout_width - 宽。fill_parent: 宽度跟着父元素走;wrap_content: 宽度跟着本身的内容走;直接指定一个 px 值来设置宽 layout_height - 高。fill_parent: 高度跟着父元素走;wrap_content: 高度跟着本身的内容走;直接指定一个 px 值来设置高 --> <!-- LinearLayout - 线形布局。 orientation - 容器内元素的排列方式。vertical: 子元素们垂直排列;horizontal: 子元素们水平排列 gravity - 内容的排列形式。常用的有 top, bOTTom, left, right, center 等,详见文档 --> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:gravity="right" android:layout_width="fill_parent" android:layout_height="fill_parent"> <!-- FrameLayout - 层叠式布局。以左上角为起点,将 FrameLayout 内的元素一层覆盖一层地显示 --> <FrameLayout android:layout_height="wrap_content" android:layout_width="fill_parent"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="FrameLayout"> </TextView> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Frame Layout"> </TextView> </FrameLayout> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/hello" /> <!-- TableLayout - 表格式布局。 TableRow - 表格内的行,行内每一个元素算作一列 collapseColumns - 设置 TableLayout 内的 TableRow 中需要隐藏的列的列索引,多个用“,”隔开 stretchColumns - 设置 TableLayout 内的 TableRow 中需要拉伸(该列会拉伸到所有可用空间)的列的列索引,多个用“,”隔开 shrinkColumns - 设置 TableLayout 内的 TableRow 中需要收缩(为了使其他列不会被挤到屏幕外,此列会自动收缩)的列的列索引,多个用“,”隔开 --> <TableLayout android:id="@+id/TableLayout01" android:layout_width="fill_parent" android:layout_height="wrap_content" android:collapseColumns="1"> <TableRow android:id="@+id/TableRow01" android:layout_width="fill_parent" android:layout_height="wrap_content"> <TextView android:layout_width="wrap_content" android:layout_weight="1" android:layout_height="wrap_content" android:text="行1列1" /> <TextView android:layout_width="wrap_content" android:layout_weight="1" android:layout_height="wrap_content" android:text="行1列2" /> <TextView android:layout_width="wrap_content" android:layout_weight="1" android:layout_height="wrap_content" android:text="行1列3" /> </TableRow> <TableRow android:id="@+id/TableRow01" android:layout_width="wrap_content" android:layout_height="wrap_content"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="行2列1" /> </TableRow> </TableLayout> <!-- AbsoluteLayout - 绝对定位布局。 layout_x - x 坐标。以左上角为顶点 layout_y - y 坐标。以左上角为顶点 --> <AbsoluteLayout android:layout_height="wrap_content" android:layout_width="fill_parent"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="AbsoluteLayout" android:layout_x="100px" android:layout_y="100px" /> </AbsoluteLayout> <!-- RelativeLayout - 相对定位布局。 layout_centerInParent - 将当前元素放置到其容器内的水平方向和垂直方向的中央位置(类似的属性有 :layout_centerHorizontal, layout_alignParentLeft 等) layout_marginLeft - 设置当前元素相对于其容器的左侧边缘的距离 layout_below - 放置当前元素到指定的元素的下面 layout_alignRight - 当前元素与指定的元素右对齐 --> <RelativeLayout android:id="@+id/RelativeLayout01" android:layout_width="fill_parent" android:layout_height="fill_parent"> <TextView android:layout_width="wrap_content" android:id="@+id/abc" android:layout_height="wrap_content" android:text="centerInParent=true" android:layout_centerInParent="true" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="marginLeft=20px" android:layout_marginLeft="20px" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="xxx" android:layout_below="@id/abc" android:layout_alignRight="@id/abc" /> </RelativeLayout> </LinearLayout> res/values/strings.xml <?xml version="1.0" encoding="utf-8"?> <resources> <string name="hello">Hello Layout</string> <string name="app_name">webabcd_layout</string> </resources> Main.java 代码 package com.webabcd.layout; import android.app.Activity; import android.os.Bundle; public class Main extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); } } 2、上下文菜单,选项菜单,子菜单 res/layout/main.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <TextView android:id="@+id/txt1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello_contextMenu" /> <TextView android:id="@+id/txt2" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello_subMenu" /> </LinearLayout> res/values/strings.xml 代码 <?xml version="1.0" encoding="utf-8"?> <resources> <string name="hello_contextMenu">Hello Context Menu</string> <string name="hello_subMenu">Hello Context Sub Menu</string> <string name="app_name">webabcd_menu</string> </resources> Main.java 代码 package com.webabcd.menu; import android.app.Activity; import android.os.Bundle; import android.view.ContextMenu; import android.view.Menu; import android.view.MenuItem; import android.view.SubMenu; import android.view.View; import android.view.ContextMenu.ContextMenuInfo; import android.widget.TextView; import android.widget.Toast; // 演示两种菜单的实现方式:上下文菜单(通过在某元素上长按,来呼出菜单)和选项菜单(通过按手机上的菜单按钮,来呼出菜单) public class Main extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // 为 R.id.txt1 注册一个上下文菜单(在此 TextView 上长按,则会呼出上下文菜单) // 具体呼出的菜单内容需要重写 onCreateContextMenu 来创建 TextView txt1 = (TextView) this.findViewById(R.id.txt1); this.registerForContextMenu(txt1); // 为 R.id.txt2 注册一个上下文菜单 TextView txt2 = (TextView) this.findViewById(R.id.txt2); this.registerForContextMenu(txt2); } // 重写 onCreateContextMenu 用以创建上下文菜单 // 重写 onContextItemSelected 用以响应上下文菜单 @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { super.onCreateContextMenu(menu, v, menuInfo); // 创建 R.id.txt1 的上下文菜单 if (v == (TextView) this.findViewById(R.id.txt1)) { // ContextMenu.setIcon() - 设置菜单的图标 // ContextMenu.setHeaderTitle() - 设置菜单的标题 menu.setHeaderIcon(R.drawable.icon01); menu.setHeaderTitle("我是菜单"); // 用 ContextMenu.add() 来增加菜单项,返回值为 MenuItem // 第一个参数:组ID // 第二个参数:菜单项ID // 第三个参数:顺序号 // 第四个参数:菜单项上显示的内容 menu.add(1, 0, 0, "菜单1"); // MenuItem - 新增菜单项后的返回类型,针对菜单项的其他设置在此对象上操作 menu.add(1, 1, 1, "菜单2").setCheckable(true); } // 创建 R.id.txt2 的上下文菜单(多级上下文菜单) else if (v == (TextView) this.findViewById(R.id.txt2)) { // ContextMenu.addSubMenu("菜单名称") - 用来添加子菜单。子菜单其实就是一个特殊的菜单 SubMenu sub = menu.addSubMenu("父菜单1"); sub.setIcon(R.drawable.icon01); sub.add(0, 0, 0, "菜单1"); sub.add(0, 1, 1, "菜单2"); sub.setGroupCheckable(1, true, true); SubMenu sub2 = menu.addSubMenu("父菜单2"); sub2.setIcon(R.drawable.icon01); sub2.add(1, 0, 0, "菜单3"); sub2.add(1, 1, 1, "菜单4"); sub2.setGroupCheckable(1, true, false); } } // 重写 onCreateOptionsMenu 用以创建选项菜单 @Override public boolean onCreateOptionsMenu(Menu menu) { MenuItem menuItem = menu.add(0, 0, 0, "菜单111111111111111111111"); // MenuItem.setIcon() - 设置菜单项的图标 // MenuItem.setTitleCondensed() - 菜单的简标题,如果指定了简标题的话,菜单项上的标题将会以此简标题为准 // MenuItem.setAlphabeticShortcut() - 设置选中此菜单项的快捷键 // 注:菜单项超过 6 个的话,第 6 个菜单将会变为 More 菜单,多余的菜单会在单击 More 菜单之后显示出来 menuItem.setIcon(R.drawable.icon01); menuItem.setTitleCondensed("菜单1"); menuItem.setAlphabeticShortcut(a); menu.add(0, 1, 1, "菜单2").setIcon(R.drawable.icon02); menu.add(0, 2, 2, "菜单3").setIcon(R.drawable.icon03); menu.add(0, 3, 3, "菜单4"); menu.add(0, 4, 4, "菜单5"); menu.add(0, 5, 5, "菜单6"); menu.add(0, 6, 6, "菜单7").setIcon(R.drawable.icon04); menu.add(0, 7, 7, "菜单8").setIcon(R.drawable.icon05); return true; } // 重写 onOptionsItemSelected 用以响应选项菜单 @Override public boolean onOptionsItemSelected(MenuItem item) { super.onOptionsItemSelected(item); Toast.makeText(Main.this, "被单击的菜单项为:" + String.valueOf(item.getItemId()), Toast.LENGTH_SHORT).show(); return false; } } 对话框(Dialog)和通知(Notification) 作者:webabcd 介绍 在 Android 中种对话框及各种通知效果的应用 ? 常用对话框的使用,弹出式对话框、日期选择对话框、时间选择对话框、进度条对话框 ? 通知(出现在通知列表)和提示性通知(Toast)的演示 3、常用对话框的演示 res/layout/main.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <TextView android:id="@+id/txtMsg" android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView> <Button android:id="@+id/btn1" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button> <Button android:id="@+id/btn2" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button> <Button android:id="@+id/btn3" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button> <Button android:id="@+id/btn4" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button> <Button android:id="@+id/btn5" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button> <Button android:id="@+id/btn6" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button> </LinearLayout> res/layout/view.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <TextView android:text="我是一个 View" android:layout_width="wrap_content" android:layout_height="wrap_content"> </TextView> </LinearLayout> res/values/array.xml <?xml version="1.0" encoding="utf-8"?> <resources> <!-- 定义一个名为 ary 的 string 类型的数组 --> <string-array name="ary"> <item>项目 1</item> <item>项目 2</item> </string-array> </resources> Main.java 代码 package com.webabcd.dialog; import java.util.Calendar; import android.app.Activity; import android.app.AlertDialog; import android.app.DatePickerDialog; import android.app.Dialog; import android.app.ProgressDialog; import android.app.TimePickerDialog; import android.app.DatePickerDialog.OnDateSetListener; import android.app.TimePickerDialog.OnTimeSetListener; import android.content.DialogInterface; import android.content.DialogInterface.OnClickListener; import android.os.Bundle; import android.view.View; import android.widget.DatePicker; import android.widget.TextView; import android.widget.TimePicker; import android.widget.Button; public class Main extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // 弹出式对话框的 Demo。先调用 Builder(),在 Create(), 需要显示对话框的是后再调用 show() AlertDialog dialog = new AlertDialog.Builder(this).setTitle("弹出对话框").create(); dialog.show(); // 以下是各种对话框的 Demo MyButtonClickListener listener = new MyButtonClickListener(); Button btn1 = (Button) this.findViewById(R.id.btn1); btn1.setText("简单的对话框的 Demo"); btn1.setOnClickListener(listener); Button btn2 = (Button) this.findViewById(R.id.btn2); btn2.setText("包括常用设置的对话框(数据来自 xml)"); btn2.setOnClickListener(listener); Button btn3 = (Button) this.findViewById(R.id.btn3); btn3.setText("弹出的对话框的内容是一个 View"); btn3.setOnClickListener(listener); Button btn4 = (Button) this.findViewById(R.id.btn4); btn4.setText("日期选择对话框"); btn4.setOnClickListener(listener); Button btn5 = (Button) this.findViewById(R.id.btn5); btn5.setText("时间选择对话框"); btn5.setOnClickListener(listener); Button btn6 = (Button) this.findViewById(R.id.btn6); btn6.setText("进度条对话框"); btn6.setOnClickListener(listener); } class MyButtonClickListener implements View.OnClickListener { @Override public void onClick(View v) { // 具体的对话框的实现可以通过重写 onCreateDialog 完成 switch (v.getId()) { case R.id.btn1: Main.this.showDialog(0); break; case R.id.btn2: Main.this.showDialog(1); break; case R.id.btn3: Main.this.showDialog(2); break; case R.id.btn4: Main.this.showDialog(3); break; case R.id.btn5: Main.this.showDialog(4); break; case R.id.btn6: Main.this.showDialog(5); break; } } } @Override public Dialog onCreateDialog(int id) { switch (id) { case 0: // 一个简单的弹出对话框 return new AlertDialog.Builder(this).setTitle("这是一个简单的弹出对话框的 Demo") .create(); case 1: // 一个相对复杂的弹出对话框 return new AlertDialog.Builder(this) .setTitle("标题") // 设置标题 // .setCustomTitle(View) // 以一个 View 作为标题 .setIcon(R.drawable.icon01) // 设置标题图片 // .setMessage("信息") // 需要显示的弹出内容 .setPositiveButton("确定", new OnClickListener() { // 设置弹框的确认按钮所显示的文本,以及单击按钮后的响应行为 @Override public void onClick(DialogInterface a0, int a1) { TextView txtMsg = (TextView) Main.this.findViewById(R.id.txtMsg); txtMsg.append("单击了对话框上的“确认”按钮
"); } }) .setItems(R.array.ary, new DialogInterface.OnClickListener() { // 弹框所显示的内容来自一个数组。数组中的数据会一行一行地依次排列 public void onClick(DialogInterface dialog, int which) { } }) // 其他常用方法如下 // .setMultiChoiceItems(arg0, arg1, arg2) // .setSingleChoiceItems(arg0, arg1, arg2) // .setNeutralButton(arg0, arg1) // .setNegativeButton(arg0, arg1) .create(); case 2: // 弹出对话框为指定的 View 的 Demo return new AlertDialog.Builder(this).setTitle("此对话框的内容是一个 View") .setView(this.findViewById(R.layout.view)).create(); case 3: // 弹出日期选择对话框 Calendar c = Calendar.getInstance(); return new DatePickerDialog(this, new OnDateSetListener() { @Override public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) { TextView txtMsg = (TextView) Main.this.findViewById(R.id.txtMsg); txtMsg.append("新设置的日期为:" + String.valueOf(year) + "-" + String.valueOf(monthOfYear) + "-" + String.valueOf(dayOfMonth) + "
"); } }, c.get(Calendar.YEAR), c.get(Calendar.MONTH), c.get(Calendar.DATE)); case 4: // 弹出时间选择对话框 Calendar c2 = Calendar.getInstance(); return new TimePickerDialog(this, new OnTimeSetListener() { @Override public void onTimeSet(TimePicker view, int hourOfDay, int minute) { TextView txtMsg = (TextView) Main.this.findViewById(R.id.txtMsg); txtMsg.append("新设置的时间为:" + String.valueOf(hourOfDay) + ":" + String.valueOf(minute) + "
"); } }, c2.get(Calendar.HOUR), c2.get(Calendar.MINUTE), true); case 5: // 弹出进度条对话框 ProgressDialog progress = new ProgressDialog(this); progress.setMessage("loading..."); return progress; default: return null; } } } 4、各种提示效果的演示 res/layout/main.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <Button android:id="@+id/btn1" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button> <Button android:id="@+id/btn2" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button> <Button android:id="@+id/btn3" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button> <Button android:id="@+id/btn4" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button> </LinearLayout> res/layout/view.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <TextView android:id="@+id/txtMsg" android:layout_width="wrap_content" android:layout_height="wrap_content"> </TextView> </LinearLayout> Main.java 代码 package com.webabcd.notification; import android.app.Activity; import android.app.Notification; import android.app.NotificationManager; import android.app.PendingIntent; import android.content.Context; import android.content.Intent; import android.os.Bundle; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.widget.Button; import android.widget.TextView; import android.widget.Toast; public class Main extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // 通过 Tost.makeText().show() 来实现提示性的通知效果 // 短时间的提示性通知的 Demo Button btn1 = (Button) this.findViewById(R.id.btn1); btn1.setText("短时间提示"); btn1.setOnClickListener(new Button.OnClickListener() { public void onClick(View v) { Toast.makeText(Main.this, "我是短时间提示", Toast.LENGTH_SHORT).show(); } }); // 长时间的提示性通知的 Demo Button btn2 = (Button) this.findViewById(R.id.btn2); btn2.setText("长时间提示"); btn2.setOnClickListener(new Button.OnClickListener() { public void onClick(View v) { Toast.makeText(Main.this, "我是长时间提示", Toast.LENGTH_LONG).show(); } }); // 以一个 View 作为提示性通知的 Demo Button btn3 = (Button) this.findViewById(R.id.btn3); btn3.setText("以一个 View 做提示"); btn3.setOnClickListener(new Button.OnClickListener() { public void onClick(View v) { View view = inflateView(R.layout.view); TextView txtMsg = (TextView) view.findViewById(R.id.txtMsg); txtMsg.setText("提示内容"); Toast toast = new Toast(Main.this); toast.setView(view); toast.setDuration(Toast.LENGTH_LONG); toast.show(); } }); Button btn4 = (Button) this.findViewById(R.id.btn4); btn4.setText("发出一个通知(Notification)"); btn4.setOnClickListener(new Button.OnClickListener() { public void onClick(View v) { // 实例化通知管理器 NotificationManager nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); // 指定单击通知后所打开的详细的通知页面(单击通知后打开 NotificationView) PendingIntent contentIntent = PendingIntent.getActivity( Main.this, 0, new Intent(Main.this, NotificationView.class), 0); // 实例化一个通知,并指定其图标和标题(在提示栏上显示) Notification n = new Notification(R.drawable.icon01, "我是滚动的通知信息我是滚动的通知信息我是滚动的通知信息", System.currentTimeMillis()); // 设置通知的发送人和通知的详细内容(打开提示栏后在通知列表中显示) n.setLatestEventInfo(Main.this, "通知发送人", "我是详细的通知信息我是详细的通知信息我是详细的通知信息", contentIntent); // 100 毫秒延迟后,震动 250 毫秒,暂停 100 毫秒后,再震动 500 毫秒 n.vibrate = new long[] { 100, 250, 100, 500 }; // 发出通知(其中第一个参数为通知标识符) nm.notify(0, n); } }); } // 将指定的 xml 资源转换为一个 View private View inflateView(int resource) { LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); return vi.inflate(resource, null); } // 打开详细通知页后此 Activity 会被 Pause,从详细通知页返回后此 Activity 会被 Resume @Override protected void onPause() { // TODO Auto-generated method stub super.onPause(); Log.d("MyDebug", "onPause"); } @Override protected void onResume() { // TODO Auto-generated method stub super.onResume(); Log.d("MyDebug", "onResume"); } } NotificationView.java 代码 package com.webabcd.notification; import android.app.Activity; import android.app.NotificationManager; import android.os.Bundle; import android.widget.TextView; // 单击通知列表的某个通知后,所打开的详细的通知页 public class NotificationView extends Activity { protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.view); TextView txtMsg = (TextView)this.findViewById(R.id.txtMsg); txtMsg.setText("点通知之后所链接到的 Activity"); NotificationManager nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); // 取消显示在通知列表中的指定通知(参数为通知标识符) nm.cancel(0); // 需要关闭此 Activity 的话就 finish 它既可 // this.finish(); } } 五、活动(Activity), 服务(Service), 广播(Broadcast), 广播接收器(BroadcastReceiver) 介绍 在 Android 中使用 Activity, Service, Broadcast, BroadcastReceiver ? 活动(Activity) - 用于表现功能 ? 服务(Service) - 相当于后台运行的 Activity ? 广播(Broadcast) - 用于发送广播 ? 广播接收器(BroadcastReceiver) - 用于接收广播 ? Intent - 用于连接以上各个组件,并在其间传递消息 1、演示 Activity 的基本用法,一个 Activity 启动另一个 Activity,启动另一个 Activity 时为其传递参数,被启动的 Activity 返回参数给启动者的 Activity Main.java 代码 package com.webabcd.activity; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.TextView; public class Main extends Activity { TextView txt; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); this.setContentView(R.layout.main); txt = (TextView) this.findViewById(R.id.txt); txt.setText("Activity 1"); Button btn = (Button) this.findViewById(R.id.btn); btn.setText("启动另一个Activity"); btn.setOnClickListener(new Button.OnClickListener() { @Override public void onClick(View v) { // 实例化 Intent,指定需要启动的 Activity Intent intent = new Intent(); intent.seTCLass(Main.this, MyActivity.class); // 实例化 Bundle,设置需要传递的参数 Bundle bundle = new Bundle(); bundle.putString("name", "webabcd"); bundle.putDouble("salary", 100.13); // 将需要传递的参数赋值给 Intent 对象 intent.putExtras(bundle); // startActivity(intent); // 启动指定的 Intent(不等待返回结果) // Main.this.finish(); // 启动指定的 Intent,并等待返回结果 // 其中第二个参数如果大于等于零,则返回结果时会回调 onActivityResult() 方法 startActivityForResult(intent, 0); } }); Log.d("MyDebug", "onCreate"); } // 被启动的 Activity 返回结果时的回调函数 @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (resultCode == Activity.RESULT_OK){ Bundle bundle = data.getExtras(); String name = bundle.getString("name"); double salary = bundle.getDouble("salary"); txt.setText("Activity 1" + "
名字:" + name + "
薪水:" + String.valueOf(salary)); } } @Override protected void onStart() { // TODO Auto-generated method stub super.onStart(); Log.d("MyDebug", "onStart"); } @Override protected void onStop() { // TODO Auto-generated method stub super.onStop(); Log.d("MyDebug", "onStop"); } @Override protected void onRestart() { // TODO Auto-generated method stub super.onRestart(); Log.d("MyDebug", "onRestart"); } @Override protected void onPause() { // TODO Auto-generated method stub super.onPause(); Log.d("MyDebug", "onPause"); } @Override protected void onResume() { // TODO Auto-generated method stub super.onResume(); Log.d("MyDebug", "onResume"); } @Override protected void onDestroy() { // TODO Auto-generated method stub super.onDestroy(); Log.d("MyDebug", "onDestroy"); } } MyActivity.java 代码 package com.webabcd.activity; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.TextView; // 被另一个 Activity 所启动的 Activity public class MyActivity extends Activity { Intent intent; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); this.setContentView(R.layout.main2); // 获取启动者传递过来的参数 intent = this.getIntent(); Bundle bundle = intent.getExtras(); String name = bundle.getString("name"); double salary = bundle.getDouble("salary"); TextView txt = (TextView) this.findViewById(R.id.txt); txt.setText("Activity 2" + "
名字:" + name + "
薪水:" + String.valueOf(salary)); Button btn = (Button) this.findViewById(R.id.btn); btn.setText("返回前一个Activity"); btn.setOnClickListener(new Button.OnClickListener() { public void onClick(View v) { // 返回参数给启动者 MyActivity.this.setResult(Activity.RESULT_OK, intent); MyActivity.this.finish(); } }); } } AndroidManifest.xml 代码 <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.webabcd.activity" android:versionCode="1" android:versionName="1.0"> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".Main" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <!-- 如果有需要用到的 Activity ,则都要在这里做相应的配置 --> <activity android:name=".MyActivity" android:label="Activity 2" /> </application> <uses-sdk android:minSdkVersion="3" /> </manifest> 2、Service, Broadcast, BroadcastReceiver 的演示 Main.java 代码 package com.webabcd.service; import android.app.Activity; import android.content.BroadcastReceiver; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.ServiceConnection; import android.os.Bundle; import android.os.IBinder; import android.view.View; import android.view.View.OnClickListener; import android.widget.TextView; /* * startService() 和 bindService() 的区别 * startService() - 正常理解就好 * bindService() - 使当前上下文对象(本例中就是 Activity)通过一个 ServiceConnection 对象邦定到指定的 Service 。这样,如果上下文对象销毁了的话,那么其对应的 Service 也会被销毁 */ public class Main extends Activity implements OnClickListener { private TextView txtMsg; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); setTitle("android 之 service"); this.findViewById(R.id.btnStart).setOnClickListener(this); this.findViewById(R.id.btnStop).setOnClickListener(this); this.findViewById(R.id.btnBind).setOnClickListener(this); this.findViewById(R.id.btnUnbind).setOnClickListener(this); txtMsg = (TextView)this.findViewById(R.id.txtMsg); // 实例化自定义的 BroadcastReceiver receiver = new UpdateReceiver(); IntentFilter filter = new IntentFilter(); // 为 BroadcastReceiver 指定 action ,使之用于接收同 action 的广播 filter.addAction("com.webabcd.service.msg"); // 以编程方式注册 BroadcastReceiver 。配置方式注册 BroadcastReceiver 的例子见 AndroidManifest.xml 文件 // 一般在 OnStart 时注册,在 OnStop 时取消注册 this.registerReceiver(receiver, filter); // this.unregisterReceiver(receiver); } @Override public void onClick(View v) { Intent intent = new Intent(Main.this, MyService.class); switch (v.getId()) { case R.id.btnStart: this.startService(intent); break; case R.id.btnStop: this.stopService(intent); break; case R.id.btnBind: this.bindService(intent, conn, Context.BIND_AUTO_CREATE); break; case R.id.btnUnbind: this.unbindService(conn); break; } } // bindService() 所需的 ServiceConnection 对象 private ServiceConnection conn = new ServiceConnection() { @Override public void onServiceConnected(ComponentName className, IBinder service) { } @Override public void onServiceDisconnected(ComponentName className) { } }; private String msg=""; private UpdateReceiver receiver; // 实现一个 BroadcastReceiver,用于接收指定的 Broadcast public class UpdateReceiver extends BroadcastReceiver{ @Override public void onReceive(Context context, Intent intent) { msg = intent.getStringExtra("msg"); txtMsg.append(msg + "
"); } } } MyService.java 代码 package com.webabcd.service; import android.app.Service; import android.content.Intent; import android.os.IBinder; import android.util.Log; // 演示 Service 的生命周期。具体信息运行程序后在 LogCat 中查看 public class MyService extends Service { @Override public IBinder onBind(Intent intent) { Log.d("MyDebug", "onBind"); sendMsg("onBind"); // TODO Auto-generated method stub return null; } @Override public void onCreate() { // TODO Auto-generated method stub super.onCreate(); Log.d("MyDebug", "onCreate"); sendMsg("onCreate"); } @Override public void onDestroy() { // TODO Auto-generated method stub super.onDestroy(); Log.d("MyDebug", "onDestroy"); sendMsg("onDestroy"); } @Override public void onRebind(Intent intent) { // TODO Auto-generated method stub super.onRebind(intent); Log.d("MyDebug", "onRebind"); sendMsg("onRebind"); } @Override public void onStart(Intent intent, int startId) { super.onStart(intent, startId); Log.d("MyDebug", "onStart"); sendMsg("onStart"); } @Override public boolean onUnbind(Intent intent) { Log.d("MyDebug", "onUnbind"); sendMsg("onUnbind"); // TODO Auto-generated method stub return super.onUnbind(intent); } // 发送广播信息 private void sendMsg(String msg){ // 指定广播目标的 action (注:指定了此 action 的 receiver 会接收此广播) Intent intent = new Intent("com.webabcd.service.msg"); // 需要传递的参数 intent.putExtra("msg", msg); // 发送广播 this.sendBroadcast(intent); } } MyBootReceiver.java 代码 package com.webabcd.service; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.util.Log; public class MyBootReceiver extends BroadcastReceiver { // 用于接收满足条件的 Broadcast(相应的 Broadcast 的注册信息详见 AndroidManifest.xml ,当系统启动完毕后会调用这个广播接收器) @Override public void onReceive(Context arg0, Intent arg1) { Log.d("MyDebug", "onReceive"); // 启动服务 Intent service = new Intent(arg0, MyService.class); arg0.startService(service); } } AndroidManifest.xml 代码 <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.webabcd.service" android:versionCode="1" android:versionName="1.0"> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".Main" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <!-- 如果有需要用到的 service ,则都要在这里做相应的配置 --> <service android:name=".MyService"></service> <!-- 注册一个 BroadcastReceiver 其 intent-filter 为 android.intent.action.BOOT_COMPLETED(用于接收系统启动完毕的 Broadcast) --> <receiver android:name=".MyBootReceiver"> <intent-filter> <action android:name="android.intent.action.BOOT_COMPLETED" /> </intent-filter> </receiver> </application> <!-- 接受系统启动完毕的 Broadcast 的权限 --> <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" /> <uses-sdk android:minSdkVersion="3" /> </manifest> Android控件 在 Android 中使用各种控件(View) ? TextView - 文本显示控件 ? Button - 按钮控件 ? ImageButton - 图片按钮控件 ? ImageView - 图片显示控件 ? CheckBox - 复选框控件 ? RadioButton - 单选框控件 ? AnalogClock - 钟表(带表盘的那种)控件 ? DigitalClock - 电子表控件 1、TextView(文本显示控件) 的 Demo textview.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <!-- TextView - 文本显示控件 --> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/textView" /> </LinearLayout> _TextView.java 代码 package com.webabcd.view; import android.app.Activity; import android.os.Bundle; import android.widget.TextView; public class _TextView extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.textview); // 设置 Activity 的标题 setTitle("TextView"); TextView txt = (TextView) this.findViewById(R.id.textView); // 设置文本显示控件的文本内容,需要换行的话就用“
” txt.setText("我是 TextView
显示文字用的"); } } 2、Button(按钮控件) 的 Demo button.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/textView" /> <!-- Button - 按钮控件 --> <Button android:id="@+id/button" android:layout_width="wrap_content" android:layout_height="wrap_content"> </Button> </LinearLayout> _Button.java 代码 package com.webabcd.view; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.TextView; public class _Button extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.button); setTitle("Button"); Button btn = (Button) this.findViewById(R.id.button); btn.setText("click me"); // setOnClickListener() - 响应按钮的鼠标单击事件 btn.setOnClickListener(new Button.OnClickListener(){ @Override public void onClick(View v) { TextView txt = (TextView) _Button.this.findViewById(R.id.textView); txt.setText("按钮被单击了"); } }); } } 3、ImageButton(图片按钮控件) 的 Demo imagebutton.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/textView" /> <!-- ImageButton - 图片按钮控件 --> <ImageButton android:id="@+id/imageButton" android:layout_width="wrap_content" android:layout_height="wrap_content"> </ImageButton> </LinearLayout> _ImageButton.java 代码 package com.webabcd.view; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.ImageButton; import android.widget.TextView; public class _ImageButton extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.imagebutton); setTitle("ImageButton"); ImageButton imgButton = (ImageButton) this.findViewById(R.id.imageButton); // 设置图片按钮的背景 imgButton.setBackgroundResource(R.drawable.icon01); // setOnClickListener() - 响应图片按钮的鼠标单击事件 imgButton.setOnClickListener(new Button.OnClickListener(){ @Override public void onClick(View v) { TextView txt = (TextView) _ImageButton.this.findViewById(R.id.textView); txt.setText("图片按钮被单击了"); } }); } } 4、ImageView(图片显示控件) 的 Demo imageview.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <!-- ImageView - 图片显示控件 --> <ImageView android:id="@+id/imageView" android:layout_width="wrap_content" android:layout_height="wrap_content"></ImageView> </LinearLayout> _ImageView.java 代码 package com.webabcd.view; import android.app.Activity; import android.os.Bundle; import android.widget.ImageView; public class _ImageView extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.imageview); setTitle("ImageView"); ImageView imgView = (ImageView) this.findViewById(R.id.imageView); // 指定需要显示的图片 imgView.setBackgroundResource(R.drawable.icon01); } } 5、CheckBox(复选框控件) 的 Demo checkbox.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/textView" /> <!-- CheckBox - 复选框控件 --> <CheckBox android:text="CheckBox01" android:id="@+id/chk1" android:layout_width="wrap_content" android:layout_height="wrap_content"></CheckBox> <CheckBox android:text="CheckBox02" android:id="@+id/chk2" android:layout_width="wrap_content" android:layout_height="wrap_content"></CheckBox> <CheckBox android:text="CheckBox03" android:id="@+id/chk3" android:layout_width="wrap_content" android:layout_height="wrap_content"></CheckBox> </LinearLayout> _CheckBox.java 代码 package com.webabcd.view; import android.app.Activity; import android.os.Bundle; import android.widget.CheckBox; import android.widget.CompoundButton; import android.widget.TextView; public class _CheckBox extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.checkbox); setTitle("CheckBox"); CheckBox chk = (CheckBox) this.findViewById(R.id.chk1); // setOnCheckedChangeListener() - 响应复选框的选中状态改变事件 chk.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { TextView txt = (TextView) _CheckBox.this.findViewById(R.id.textView); txt.setText("CheckBox01 的选中状态:" + String.valueOf(isChecked)); } }); } } 6、RadioButton(单选框控件) 的 Demo radiobutton.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/textView" /> <!-- RadioButton - 单选框控件 RadioGroup - 对其内的单选框控件做分组 checkedButton - 指定组内被选中的单选框的 ID --> <RadioGroup android:id="@+id/radioGroup" android:layout_width="fill_parent" android:layout_height="fill_parent" android:checkedButton="@+id/rad3" android:orientation="horizontal" android:gravity="center_vertical|center_horizontal"> <RadioButton android:text="rad1" android:id="@+id/rad1" android:layout_width="wrap_content" android:layout_height="wrap_content"></RadioButton> <RadioButton android:text="rad2" android:id="@+id/rad2" android:layout_width="wrap_content" android:layout_height="wrap_content"></RadioButton> <RadioButton android:text="rad3" android:id="@+id/rad3" android:layout_width="wrap_content" android:layout_height="wrap_content"></RadioButton> </RadioGroup> </LinearLayout> _RadioButton.java 代码 package com.webabcd.view; import android.app.Activity; import android.os.Bundle; import android.widget.RadioButton; import android.widget.RadioGroup; import android.widget.TextView; public class _RadioButton extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.radiobutton); setTitle("RadioButton"); RadioGroup group = (RadioGroup) this.findViewById(R.id.radioGroup); // setOnCheckedChangeListener() - 响应单选框组内的选中项发生变化时的事件 group.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() { @Override public void onCheckedChanged(RadioGroup group, int checkedId) { TextView txt = (TextView) _RadioButton.this.findViewById(R.id.textView); txt.setText(((RadioButton)findViewById(checkedId)).getText() + " 被选中"); } }); } } 7、AnalogClock(钟表(带表盘的那种)控件) 的 Demo analogclock.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <!-- AnalogClock - 钟表(带表盘的那种)控件 --> <AnalogClock android:id="@+id/analogClock" android:layout_width="wrap_content" android:layout_height="wrap_content"> </AnalogClock> </LinearLayout> _AnalogClock.java 代码 package com.webabcd.view; import android.app.Activity; import android.os.Bundle; public class _AnalogClock extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.analogclcok); setTitle("AnalogClock"); } } 运行例图: 8、DigitalClock(电子表控件) 的 Demo digitalclock.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <!-- DigitalClock - 电子表控件 --> <DigitalClock android:id="@+id/digitalClock" android:layout_width="wrap_content" android:layout_height="wrap_content"> </DigitalClock> </LinearLayout> _DigitalClock.java 代码 package com.webabcd.view; import android.app.Activity; import android.os.Bundle; public class _DigitalClock extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.digitalclcok); setTitle("DigitalClcok"); } } ? DatePicker - 日期选择控件 ? TimePicker - 时间选择控件 ? ToggleButton - 双状态按钮控件 ? EditText - 可编辑文本控件 ? ProgressBar - 进度条控件 ? SeekBar - 可拖动的进度条控件 ? AutoCompleteTextView - 支持自动完成功能的可编辑文本控件 ? MultiAutoCompleteTextView - 支持自动完成功能的可编辑文本控件,允许输入多值(多值之间会自动地用指定的分隔符分开) 9、DatePicker (日期选择控件)的 Demo datepicker.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <!-- DatePicker - 日期选择控件 --> <DatePicker android:id="@+id/datePicker" android:layout_width="wrap_content" android:layout_height="wrap_content"> </DatePicker> </LinearLayout> _DatePicker.java 代码 package com.webabcd.view; import android.app.Activity; import android.os.Bundle; public class _DatePicker extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.datepicker); // 具体的应用可参见对话框中的示例 setTitle("DatePicker"); } } 10、TimePicker(时间选择控件) 的 Demo timepicker.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <!-- TimePicker - 时间选择控件 --> <TimePicker android:id="@+id/timePicker" android:layout_width="wrap_content" android:layout_height="wrap_content"> </TimePicker> </LinearLayout> _TimePicker.java 代码 package com.webabcd.view; import android.app.Activity; import android.os.Bundle; public class _TimePicker extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.timepicker); // 具体的应用可参见对话框中的示例 setTitle("TimePicker"); } } 11、ToggleButton(双状态按钮控件) 的 Demo togglebutton.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/textView" /> <!-- ToggleButton - 双状态按钮控件 textOn - 当按钮状态为 true 时所显示的文本 textOff - 当按钮状态为 false 时所显示的文本 --> <ToggleButton android:id="@+id/toggleButton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textOn="关闭" android:textOff="打开" /> </LinearLayout> _ToggleButton.java 代码 package com.webabcd.view; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.TextView; import android.widget.ToggleButton; public class _ToggleButton extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.togglebutton); setTitle("ToggleButton"); final ToggleButton btn = (ToggleButton) this.findViewById(R.id.toggleButton); // setOnClickListener() - 响应按钮的鼠标单击事件 btn.setOnClickListener(new Button.OnClickListener(){ @Override public void onClick(View v) { TextView txt = (TextView) _ToggleButton.this.findViewById(R.id.textView); // ToggleButton.isChecked() - 双状态按钮的按钮状态 txt.setText("按钮状态:" + String.valueOf(btn.isChecked())); } }); } } 12、EditText(可编辑文本控件) 的 Demo edittext.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <!-- EditText - 可编辑文本控件 --> <EditText android:id="@+id/editText" android:layout_width="fill_parent" android:layout_height="wrap_content"> </EditText> </LinearLayout> _EditText.java 代码 package com.webabcd.view; import android.app.Activity; import android.os.Bundle; import android.widget.EditText; public class _EditText extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.edittext); setTitle("EditText"); EditText txt = (EditText) this.findViewById(R.id.editText); txt.setText("我可编辑"); } } 13、ProgressBar(进度条控件) 的 Demo progressbar.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <!-- ProgressBar - 进度条控件 --> <!--以下分别为大、中、小的进度条控件(圆圈状)--> <ProgressBar android:id="@+android:id/progress_large" style="?android:attr/progressBarStyleLarge" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <ProgressBar android:id="@+android:id/progress" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <ProgressBar android:id="@+android:id/progress_small" style="?android:attr/progressBarStyleSmall" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <!-- 进度条控件(条状)的演示 style - 进度条的样式,本例使用内置样式 max - 进度的最大值 progress - 第一进度位置 secondaryProgress - 第二进度位置 --> <ProgressBar android:id="@+id/progress_horizontal" style="?android:attr/progressBarStyleHorizontal" android:layout_width="200px" android:layout_height="wrap_content" android:max="100" android:progress="50" android:secondaryProgress="75" /> </LinearLayout> _ProgressBar.java 代码 package com.webabcd.view; import android.app.Activity; import android.os.Bundle; import android.view.Window; // 另见对话框中的进度条 public class _ProgressBar extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); // 设置特性以允许在应用程序的标题栏上显示进度条(条状) requestWindowFeature(Window.FEATURE_PROGRESS); // 设置特性以允许在应用程序的标题栏上显示进度条(圆圈状) requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS); this.setContentView(R.layout.progressbar); setTitle("ProgressBar"); // 在标题栏上显示进度条(条状) setProgressBarVisibility(true); // 在标题栏上显示进度条(圆圈状) setProgressBarIndeterminateVisibility(true); // 指定进度条的进度 setProgress(50 * 100); setSecondaryProgress(75 * 100); } } 例图: 14、SeekBar(可拖动的进度条控件) 的 Demo seekbar.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <!-- SeekBar - 可拖动的进度条控件 max - 进度的最大值 progress - 第一进度位置 secondaryProgress - 第二进度位置 --> <SeekBar android:id="@+id/seekBar" android:layout_width="fill_parent" android:layout_height="wrap_content" android:max="100" android:progress="50" android:secondaryProgress="75" /> <TextView android:id="@+id/progress" android:layout_width="fill_parent" android:layout_height="wrap_content" /> <TextView android:id="@+id/tracking" android:layout_width="fill_parent" android:layout_height="wrap_content" /> </LinearLayout> _SeekBar.java 代码 package com.webabcd.view; import android.app.Activity; import android.os.Bundle; import android.widget.SeekBar; import android.widget.TextView; public class _SeekBar extends Activity implements SeekBar.OnSeekBarChangeListener { SeekBar mSeekBar; TextView mProgressText; TextView mTrackingText; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.seekbar); setTitle("SeekBar"); mSeekBar = (SeekBar) findViewById(R.id.seekBar); // setOnSeekBarChangeListener() - 响应拖动进度条事件 mSeekBar.setOnSeekBarChangeListener(this); mProgressText = (TextView) findViewById(R.id.progress); mTrackingText = (TextView) findViewById(R.id.tracking); } // 拖动进度条后,进度发生改变时的回调事件 public void onProgressChanged(SeekBar seekBar, int progress, boolean fromTouch) { mProgressText.setText(progress + "%"); } // 拖动进度条前开始跟踪触摸 public void onStartTrackingTouch(SeekBar seekBar) { mTrackingText.setText("开始跟踪触摸"); } // 拖动进度条后停止跟踪触摸 public void onStopTrackingTouch(SeekBar seekBar) { mTrackingText.setText("停止跟踪触摸"); } } 例图: 15、AutoCompleteTextView(支持自动完成功能的可编辑文本控件) 的 Demo autocompletetextview.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <!-- AutoCompleteTextView - 支持自动完成功能的可编辑文本控件 --> <AutoCompleteTextView android:id="@+id/editText" android:layout_width="fill_parent" android:layout_height="wrap_content" /> </LinearLayout> _AutoCompleteTextView.java 代码 package com.webabcd.view; import android.app.Activity; import android.os.Bundle; import android.widget.ArrayAdapter; import android.widget.AutoCompleteTextView; public class _AutoCompleteTextView extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.autocompletetextview); setTitle("AutoCompleteTextView"); // 实例化适配器,指定显示格式及数据源 ArrayAdapter<String> adapter = new ArrayAdapter<String>( this, android.R.layout.simple_dropdown_item_1line, ary); AutoCompleteTextView textView = (AutoCompleteTextView) findViewById(R.id.editText); // 指定自动完成控件的适配器 textView.setAdapter(adapter); } // 自动完成控件的所需数据的数据源 private String[] ary = new String[] { "abc", "abcd", "abcde", "abcdef", "abcdefg", "hij", "hijk", "hijkl", "hijklm", "hijklmn", }; } 例图: 16、MultiAutoCompleteTextView(支持自动完成功能的可编辑文本控件,允许输入多值【多值之间会自动地用指定的分隔符分开】) 的 Demo multiautocompletetextview.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <!-- MultiAutoCompleteTextView - 支持自动完成功能的可编辑文本控件,允许输入多值(多值之间会自动地用指定的分隔符分开) --> <MultiAutoCompleteTextView android:id="@+id/editText" android:layout_width="fill_parent" android:layout_height="wrap_content" /> </LinearLayout> _MultiAutoCompleteTextView.java 代码 package com.webabcd.view; import android.app.Activity; import android.os.Bundle; import android.widget.ArrayAdapter; import android.widget.MultiAutoCompleteTextView; public class _MultiAutoCompleteTextView extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.multiautocompletetextview); setTitle("MultiAutoCompleteTextView"); // 实例化适配器,指定显示格式及数据源 ArrayAdapter<String> adapter = new ArrayAdapter<String>( this, android.R.layout.simple_dropdown_item_1line, ary); MultiAutoCompleteTextView textView = (MultiAutoCompleteTextView) findViewById(R.id.editText); textView.setAdapter(adapter); // 设置多个值之间的分隔符,此处为逗号 textView.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer()); } // 自动完成控件的所需数据的数据源 private String[] ary = new String[] { "abc", "abcd", "abcde", "abcdef", "abcdefg", "hij", "hijk", "hijkl", "hijklm", "hijklmn", }; } ? ZoomControls - 放大/缩小按钮控件 ? Include - 整合控件 ? VideoView - 视频播放控件 ? WebView - 浏览器控件 ? RatingBar - 评分控件 ? Tab - 选项卡控件 ? Spinner - 下拉框控件 ? Chronometer - 计时器控件 ? ScrollView - 滚动条控件 17、ZoomControls(放大/缩小按钮控件) 的 Demo zoomcontrols.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <!-- 放大/缩小按钮控件 --> <ZoomControls android:id="@+id/zoomControls" android:layout_width="wrap_content" android:layout_height="wrap_content"></ZoomControls> </LinearLayout> _ZoomControls.java 代码 package com.webabcd.view; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Toast; import android.widget.ZoomControls; public class _ZoomControls extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.zoomcontrols); setTitle("ZoomControls"); ZoomControls zoomControls = (ZoomControls) this.findViewById(R.id.zoomControls); // setOnZoomInClickListener() - 响应单击放大按钮的事件 zoomControls.setOnZoomInClickListener(new OnClickListener() { public void onClick(View v) { Toast.makeText(_ZoomControls.this, "单击了放大按钮", Toast.LENGTH_SHORT).show(); } }); // setOnZoomOutClickListener() - 响应单击缩小按钮的事件 zoomControls.setOnZoomOutClickListener(new OnClickListener() { public void onClick(View v) { Toast.makeText(_ZoomControls.this, "单击了缩小按钮", Toast.LENGTH_SHORT).show(); } }); } } 例图: 18、Include(整合控件) 的 Demo include.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <!-- include - 整合控件,将指定的 layout 整合进来 layout - 指定需要整合 layout --> <include android:id="@+id/cell1" layout="@layout/include_1" /> <include android:id="@+id/cell2" android:layout_width="fill_parent" layout="@layout/include_2" /> </LinearLayout> include_1.xml 代码 <?xml version="1.0" encoding="utf-8"?> <TextView xmlns:android="http://schemas.android.com/apk/res/android" android:text="TextView01" android:layout_width="wrap_content" android:layout_height="wrap_content"> </TextView> include_2.xml 代码 <?xml version="1.0" encoding="utf-8"?> <TextView xmlns:android="http://schemas.android.com/apk/res/android" android:text="TextView02" android:layout_width="wrap_content" android:layout_height="wrap_content"> </TextView> _Include.java 代码 package com.webabcd.view; import android.app.Activity; import android.os.Bundle; public class _Include extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.include); setTitle("Include"); } } 19、VideoView(视频播放控件) 的 Demo videoview.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <!-- VideoView - 视频播放控件 --> <VideoView android:id="@+id/videoView" android:layout_width="wrap_content" android:layout_height="wrap_content"> </VideoView> </LinearLayout> _VideoView.java 代码 package com.webabcd.view; import android.app.Activity; import android.net.Uri; import android.os.Bundle; import android.widget.MediaController; import android.widget.VideoView; public class _VideoView extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.videoview); setTitle("VideoView"); VideoView videoView = (VideoView) findViewById(R.id.videoView); // 指定需要播放的视频的地址 videoView.setVideoURI(Uri.parse("android.resource://com.webabcd.view/" + R.raw.demo)); // videoView.setVideoPath(); // 设置播放器的控制条 videoView.setMediaController(new MediaController(this)); // 开始播放视频 videoView.start(); } } 20、WebView(浏览器控件) 的 Demo webview.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <!-- WebView - 浏览器控件(WebKit 内核) --> <WebView android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/webView" /> </LinearLayout> _WebView.java 代码 package com.webabcd.view; import android.app.Activity; import android.os.Bundle; import android.webkit.WebSettings; import android.webkit.WebView; public class _WebView extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.webview); setTitle("WebView"); WebView webView = (WebView) findViewById(R.id.webView); // 配置浏览器,使其可支持 JavaScript WebSettings webSettings = webView.getSettings(); webSettings.setJavaScriptEnabled(true); // 清除浏览器缓存 webView.clearCache(true); // 指定浏览器需要解析的 url 地址 webView.loadUrl("http://webabcd.cnblogs.com/"); // 指定浏览器需要解析的 html 数据 // webView.loadData("<a >webabcd</a>", "text/html", "utf-8"); } } 21、RatingBar(评分控件) 的 Demo ratingbar.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <!-- RatingBar - 评分控件 numStars - 评分控件的星星的数量 rating - 当前评分的值 --> <RatingBar android:id="@+id/ratingBar" android:numStars="5" android:rating="1.5" android:layout_width="wrap_content" android:layout_height="wrap_content"> </RatingBar> <TextView android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </LinearLayout> _RatingBar.java 代码 package com.webabcd.view; import android.app.Activity; import android.os.Bundle; import android.widget.RatingBar; import android.widget.TextView; public class _RatingBar extends Activity implements RatingBar.OnRatingBarChangeListener { private RatingBar mRatingBar; private TextView mTextView; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.ratingbar); setTitle("RatingBar"); mTextView = (TextView) findViewById(R.id.textView); mRatingBar = (RatingBar) findViewById(R.id.ratingBar); // setOnRatingBarChangeListener() - 响应评分值发生改变的事件 mRatingBar.setOnRatingBarChangeListener(this); } @Override public void onRatingChanged(RatingBar ratingBar, float rating, boolean fromUser) { mTextView.setText(String.valueOf(rating)); } } 例图: 22、Tab(选项卡控件) 的 Demo tab.xml 代码 <?xml version="1.0" encoding="utf-8"?> <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent"> <!-- Tab 1 的内容 --> <TextView android:id="@+id/view1" android:layout_width="fill_parent" android:layout_height="fill_parent" android:text="tab1 content" /> <!-- Tab 2 的内容 --> <TextView android:id="@+id/view2" android:layout_width="fill_parent" android:layout_height="fill_parent" android:text="tab2 content" /> </FrameLayout> _Tab.java 代码 package com.webabcd.view; import android.app.TabActivity; import android.content.Intent; import android.os.Bundle; import android.view.LayoutInflater; import android.widget.TabHost; // 实现 Tab 功能的话要继承 TabActivity public class _Tab extends TabActivity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); TabHost tabHost = getTabHost(); LayoutInflater.from(this).inflate(R.layout.tab, tabHost.getTabContentView(), true); // Tab 1 的内容 tabHost.addTab(tabHost.newTabSpec("tab1") .setIndicator("tab1") .setContent(R.id.view1)); // Tab 2 的内容(设置了 Tab 图片) tabHost.addTab(tabHost.newTabSpec("tab2") .setIndicator("tab2", getResources().getDrawable(R.drawable.icon01)) .setContent(R.id.view2)); // Tab 3 的内容(设置 Tab 的内容为指定的 Activity) tabHost.addTab(tabHost.newTabSpec("tab3") .setIndicator("tab3") .setContent(new Intent(this, _TextView.class))); } } 23、Spinner(下拉框控件) 的 Demo spinner.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/textView" /> <!-- Spinner - 下拉框控件 --> <Spinner android:id="@+id/spinner" android:layout_width="fill_parent" android:layout_height="wrap_content" /> </LinearLayout> Values/select.xml 代码 <?xml version="1.0" encoding="utf-8"?> <resources> <string-array name="colors"> <item>red</item> <item>blue</item> <item>green</item> <item>yellow</item> <item>black</item> </string-array> </resources> _Spinner.java 代码 package com.webabcd.view; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.Spinner; import android.widget.TextView; public class _Spinner extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.spinner); setTitle("Spinner"); Spinner spinner = (Spinner) findViewById(R.id.spinner); // 设置下拉框控件的标题文本 spinner.setPrompt("请选择"); // 实例化适配器,指定显示格式及数据源 ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource( this, R.array.colors, android.R.layout.simple_spinner_item); adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); spinner.setAdapter(adapter); // setOnItemSelectedListener() - 响应下拉框的选中值发生变化的事件 spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) { TextView textView = (TextView)_Spinner.this.findViewById(R.id.textView); textView.setText(((TextView)arg1).getText()); } @Override public void onNothingSelected(AdapterView<?> arg0) { } }); } } 24、Chronometer(计时器控件) 的 Demo chronometer.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <!-- Chronometer - 计时器控件 --> <Chronometer android:id="@+id/chronometer" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <Button android:id="@+id/btnStart" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="开始计时"> <requestFocus /> </Button> <Button android:id="@+id/btnStop" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="停止计时"> </Button> <Button android:id="@+id/btnReset" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="计时器复位"> </Button> </LinearLayout> _Chronometer.java 代码 package com.webabcd.view; import android.app.Activity; import android.os.Bundle; import android.os.SystemClock; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.Chronometer; public class _Chronometer extends Activity { private Chronometer mChronometer; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.chronometer); setTitle("Chronometer"); Button button; mChronometer = (Chronometer) findViewById(R.id.chronometer); // 设置计时器所显示的时间格式 mChronometer.setFormat("计时:(%s)"); button = (Button) findViewById(R.id.btnStart); button.setOnClickListener(mStartListener); button = (Button) findViewById(R.id.btnStop); button.setOnClickListener(mStopListener); button = (Button) findViewById(R.id.btnReset); button.setOnClickListener(mResetListener); } View.OnClickListener mStartListener = new OnClickListener() { public void onClick(View v) { // 启动计时器 mChronometer.start(); } }; View.OnClickListener mStopListener = new OnClickListener() { public void onClick(View v) { // 暂停计时器 mChronometer.stop(); } }; View.OnClickListener mResetListener = new OnClickListener() { public void onClick(View v) { // 复位计时器,即停止计时器 mChronometer.setBase(SystemClock.elapsedRealtime()); } }; } 25、ScrollView(滚动条控件) 的 Demo scrollview.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <!-- ScrollView - 滚动条控件 scrollbarStyle - 滚动条的样式 --> <ScrollView android:id="@+id/scrollView" android:layout_width="fill_parent" android:layout_height="200px" android:scrollbarStyle="outsideOverlay" android:background="@android:drawable/edit_text"> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/textView" /> </ScrollView> </LinearLayout> _ScrollView.java 代码 package com.webabcd.view; import android.app.Activity; import android.os.Bundle; import android.widget.TextView; public class _ScrollView extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.scrollview); setTitle("ScrollView"); TextView textView = (TextView)this.findViewById(R.id.textView); textView.setText("a
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a"); } } 例图: ? TextSwitcher - 文字转换器控件(改变文字时增加一些动画效果) ? Gallery - 缩略图浏览器控件 ? ImageSwitcher - 图片转换器控件(改变图片时增加一些动画效果) ? GridView - 网格控件 ? ListView - 列表控件 ? ExpandableList - 支持展开/收缩功能的列表控件 26、TextSwitcher(文字转换器控件(改变文字时增加一些动画效果)) 的 Demo textswitcher.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <Button android:id="@+id/btnChange" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="改变文字" /> <!-- TextSwitcher - 文字转换器控件(改变文字时增加一些动画效果) --> <TextSwitcher android:id="@+id/textSwitcher" android:layout_width="fill_parent" android:layout_height="wrap_content" /> </LinearLayout> _TextSwitcher.java 代码 package com.webabcd.view; import java.util.Random; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.animation.Animation; import android.view.animation.AnimationUtils; import android.widget.Button; import android.widget.TextSwitcher; import android.widget.TextView; import android.widget.ViewSwitcher; public class _TextSwitcher extends Activity implements ViewSwitcher.ViewFactory { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.textswithcer); setTitle("TextSwithcer"); final TextSwitcher switcher = (TextSwitcher) findViewById(R.id.textSwitcher); // 指定转换器的 ViewSwitcher.ViewFactory switcher.setFactory(this); // 设置淡入和淡出的动画效果 Animation in = AnimationUtils.loadAnimation(this, android.R.anim.fade_in); Animation out = AnimationUtils.loadAnimation(this, android.R.anim.fade_out); switcher.setInAnimation(in); switcher.setOutAnimation(out); // 单击一次按钮改变一次文字 Button btnChange = (Button) this.findViewById(R.id.btnChange); btnChange.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { switcher.setText(String.valueOf(new Random().nextInt())); } }); } // 重写 ViewSwitcher.ViewFactory 的 makeView(),返回一个 View @Override public View makeView() { TextView textView = new TextView(this); textView.setTextSize(36); return textView; } } 例图: 27、Gallery(缩略图浏览器控件) 的 Demo gallery.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <!-- Gallery - 缩略图浏览器控件 spacing - 缩略图列表中各个缩略图之间的间距 --> <Gallery android:id="@+id/gallery" android:layout_width="fill_parent" android:layout_height="wrap_content" android:spacing="20px" /> </LinearLayout> _Gallery.java 代码 package com.webabcd.view; import android.app.Activity; import android.content.Context; import android.os.Bundle; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.BaseAdapter; import android.widget.Gallery; import android.widget.ImageView; import android.widget.Toast; import android.widget.Gallery.LayoutParams; public class _Gallery extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.gallery); setTitle("Gallery"); Gallery gallery = (Gallery) findViewById(R.id.gallery); // 为缩略图浏览器指定一个适配器 gallery.setAdapter(new ImageAdapter(this)); // 响应 在缩略图列表上选中某个缩略图后的 事件 gallery.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> parent, View v, int position, long id) { Toast.makeText(_Gallery.this, String.valueOf(position), Toast.LENGTH_SHORT).show(); } @Override public void onNothingSelected(AdapterView<?> arg0) { } }); } // 继承 BaseAdapter 用以实现自定义的图片适配器 public class ImageAdapter extends BaseAdapter { private Context mContext; public ImageAdapter(Context context) { mContext = context; } public int getCount() { return mThumbIds.length; } public Object getItem(int position) { return position; } public long getItemId(int position) { return position; } public View getView(int position, View convertView, ViewGroup parent) { ImageView image = new ImageView(mContext); image.setImageResource(mThumbIds[position]); image.setAdjustViewBounds(true); image.setLayoutParams(new Gallery.LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); return image; } } // 需要显示的图片集合 private Integer[] mThumbIds = { R.drawable.icon01, R.drawable.icon02, R.drawable.icon03, R.drawable.icon04, R.drawable.icon05 }; } 28、ImageSwitcher(图片转换器控件(改变图片时增加一些动画效果)) 的 Demo imageswitcher.xml 代码 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <Gallery android:id="@+id/gallery" android:layout_width="fill_parent" android:layout_height="wrap_content" android:spacing="20px" /> <!-- ImageSwitcher - 图片转换器控件(改变图片时增加一些动画效果) --> <ImageSwitcher android:id="@+id/imageSwitcher" android:layout_width="fill_parent" android:layout_height="wrap_content" /> </LinearLayout> _ImageSwitcher.java 代码 package com.webabcd.view; import android.app.Activity; import android.content.Context; import android.os.Bundle; import android.view.View; import android.view.ViewGroup; import android.view.animation.AnimationUtils; import android.widget.AdapterView; import android.widget.BaseAdapter; import android.widget.Gallery; import android.widget.ImageSwitcher; import android.widget.ImageView; import android.widget.ViewSwitcher; import android.widget.Gallery.LayoutParams; // 图片转换器的使用基本同文字转换器 // 以下是一个用 ImageSwitcher + Gallery 实现的经典的图片浏览器的 Demo public class _ImageSwitcher extends Activity implements ViewSwitcher.ViewFactory { private ImageSwitcher mSwitcher; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.imageswithcer); setTitle("ImageSwithcer"); mSwitcher = (ImageSwitcher) findViewById(R.id.imageSwitcher); mSwitcher.setFactory(this); mSwitcher.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_in)); mSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_out)); Gallery gallery = (Gallery) findViewById(R.id.gallery); gallery.setAdapter(new ImageAdapter(this)); gallery.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> parent, View v, int position, long id) { mSwitcher.setImageResource(mImageIds[position]); } @Override public void onNothingSelected(AdapterView<?> arg0) { } }); } public class ImageAdapter extends BaseAdapter { private Context mContext; public ImageAdapter(Context context) { mContext = context; } public int getCount() { return mThumbIds.length; } public Object getItem(int position) { return position; } public long getItemId(int position) { return position; } public View getView(int position, View convertView, ViewGroup parent) { ImageView image = new ImageView(mContext); image.setImageResource(mThumbIds[position]); image.setAdjustViewBounds(true); image.setLayoutParams(new Gallery.LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); return image; } } private Integer[] mThumbIds = { R.drawable.icon01, R.drawable.icon02, R.drawable.icon03, R.drawable.icon04, R.drawable.icon05 }; private Integer[] mImageIds = { R.drawable.icon01, R.drawable.icon02, R.drawable.icon03, R.drawable.icon04, R.drawable.icon05 }; @Override public View makeView() { ImageView image = new ImageView(this); image.setMinimumHeight(200); image.setMinimumWidth(200); image.setScaleType(ImageView.ScaleType.FIT_CENTER); image.setLayoutParams(new ImageSwitcher.LayoutParams( LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT)); return image; } } 例图: 29、GridView(网格控件) 的 Demo gridview.xml 代码 <?xml version="1.0" encoding="utf-8"?> <!-- GridView - 网格控件 numColumns="auto_fit" - 列数自适应 stretchMode - 缩放模式(stretchMode="columnWidth" - 缩放与列宽大小同步) --> <GridView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/gridView" android:layout_width="fill_parent" android:layout_height="fill_parent" android:padding="10px" android:verticalSpacing="10px" android:horizontalSpacing="10px" android:numColumns="auto_fit" android:columnWidth="60px" android:stretchMode="columnWidth" android:gravity="center"> </GridView> _GridView.java 代码 package com.webabcd.view; import android.app.Activity; import android.content.Context; import android.os.Bundle; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.GridView; import android.widget.ImageView; public class _GridView extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.gridview); setTitle("GridView"); GridView gridView = (GridView) findViewById(R.id.gridView); // 指定网格控件的适配器为自定义的图片适配器 gridView.setAdapter(new ImageAdapter(this)); } // 自定义的图片适配器 public class ImageAdapter extends BaseAdapter { private Context mContext; public ImageAdapter(Context context) { mContext = context; } public int getCount() { return mThumbIds.length; } public Object getItem(int position) { return position; } public long getItemId(int position) { return position; } public View getView(int position, View convertView, ViewGroup parent) { ImageView imageView; if (convertView == null) { imageView = new ImageView(mContext); imageView.setLayoutParams(new GridView.LayoutParams(48, 48)); imageView.setAdjustViewBounds(false); imageView.setScaleType(ImageView.ScaleType.CENTER_CROP); imageView.setPadding(5, 5, 5, 5); } else { imageView = (ImageView) convertView; } imageView.setImageResource(mThumbIds[position]); return imageView; } // 网格控件所需图片数据的数据源 private Integer[] mThumbIds = { R.drawable.icon01, R.drawable.icon02, R.drawable.icon03, R.drawable.icon04, R.drawable.icon05 }; } } 30、ListView(列表控件) 的 Demo main_list_adapter.xml 代码 <?xml version="1.0" encoding="utf-8"?> <!-- 自定义列表适配器的 layout --> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="fill_parent"> <TextView android:id="@+id/text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="16sp"> </TextView> </LinearLayout> MainListAdapter.java 代码 package com.webabcd.view; import java.util.List; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.TextView; // 继承 BaseAdapter 以实现自定义的列表适配器 public class MainListAdapter extends BaseAdapter { private LayoutInflater mInflater; private List<String> mData; public MainListAdapter(Context context, List<String> data) { mInflater = LayoutInflater.from(context); mData = data; } @Override public int getCount() { return mData.size(); } @Override public Object getItem(int position) { return mData.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { TextView text; if (convertView == null) { // 指定一个 layout 作为自定义列表适配器的 layout convertView = mInflater.inflate(R.layout.main_list_adapter, null); text = (TextView) convertView.findViewById(R.id.text); convertView.setTag(text); } else { text = (TextView) convertView.getTag(); } String mItem = mData.get(position); text.setText(mItem); return convertView; } } Main.java 代码 package com.webabcd.view; import java.util.ArrayList; import java.util.List; import android.app.ListActivity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.ListView; // 此处要继承 ListActivity ,用以实现 ListView 的功能 public class Main extends ListActivity { private List<String> mData; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setTheme(android.R.style.Theme_Light); setContentView(R.layout.main); mData = getData(); // 使用自定义的列表适配器来展现数据 MainListAdapter adapter = new MainListAdapter(this, mData); // 如需使用系统内置的列表适配器,则可以使用类似如下的方法 // ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1, mData); this.setListAdapter(adapter); } // ListView 的数据源 private List<String> getData() { List<String> items = new ArrayList<String>(); items.add("TextView"); items.add("Button"); items.add("ImageButton"); items.add("ImageView"); items.add("CheckBox"); items.add("RadioButton"); items.add("AnalogClock"); items.add("DigitalClock"); items.add("DatePicker"); items.add("TimePicker"); items.add("ToggleButton"); items.add("EditText"); items.add("ProgressBar"); items.add("SeekBar"); items.add("AutoCompleteTextView"); items.add("MultiAutoCompleteTextView"); items.add("ZoomControls"); items.add("Include"); items.add("VideoView"); items.add("WebView"); items.add("RatingBar"); items.add("Tab"); items.add("Spinner"); items.add("Chronometer"); items.add("ScrollView"); items.add("TextSwitcher"); items.add("ListView"); items.add("Gallery"); items.add("ImageSwitcher"); items.add("GridView"); items.add("ExpandableList"); return items; } // ListView 中某项被选中后的逻辑 @Override protected void onListItemClick(ListView l, View v, int position, long id) { Intent intent = new Intent(); intent.setClassName(this, "com.webabcd.view._" + mData.get(position)); startActivityForResult(intent, 0); } } 31、ExpandableList(支持展开/收缩功能的列表控件) 的 Demo _ExpandableList.java 代码 package com.webabcd.view; import android.app.ExpandableListActivity; import android.os.Bundle; import android.view.ContextMenu; import android.view.Gravity; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.view.ContextMenu.ContextMenuInfo; import android.widget.AbsListView; import android.widget.BaseExpandableListAdapter; import android.widget.ExpandableListAdapter; import android.widget.ExpandableListView; import android.widget.TextView; import android.widget.Toast; import android.widget.ExpandableListView.ExpandableListContextMenuInfo; // ExpandableList - 可展开/收缩列表 // 继承 ExpandableListActivity 以实现列表的可展开/收缩的功能 public class _ExpandableList extends ExpandableListActivity { private ExpandableListAdapter mAdapter; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setTitle("ExpandableList"); mAdapter = new MyExpandableListAdapter(); setListAdapter(mAdapter); registerForContextMenu(this.getExpandableListView()); } // 为列表的每一项创建上下文菜单(即长按后呼出的菜单) @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { menu.setHeaderTitle("ContextMenu"); menu.add(0, 0, 0, "ContextMenu"); } // 单击上下文菜单后的逻辑 @Override public boolean onContextItemSelected(MenuItem item) { ExpandableListContextMenuInfo info = (ExpandableListContextMenuInfo) item.getMenuInfo(); String title = ((TextView) info.targetView).getText().toString(); int type = ExpandableListView.getPackedPositionType(info.packedPosition); if (type == ExpandableListView.PACKED_POSITION_TYPE_CHILD) { int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition); int childPos = ExpandableListView.getPackedPositionChild(info.packedPosition); Toast.makeText(this, title + " - Group Index: " + groupPos + " Child Index: " + childPos, Toast.LENGTH_SHORT).show(); return true; } else if (type == ExpandableListView.PACKED_POSITION_TYPE_GROUP) { int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition); Toast.makeText(this, title + " - Group Index: " + groupPos, Toast.LENGTH_SHORT).show(); return true; } return false; } public class MyExpandableListAdapter extends BaseExpandableListAdapter { // 父列表数据 private String[] groups = { "group1", "group2", "group3", "group4" }; // 子列表数据 private String[][] children = { { "child1" }, { "child1", "child2" }, { "child1", "child2", "child3" }, { "child1", "child2", "child3", "child4" } }; @Override public Object getChild(int groupPosition, int childPosition) { return children[groupPosition][childPosition]; } @Override public long getChildId(int groupPosition, int childPosition) { return childPosition; } @Override public int getChildrenCount(int groupPosition) { return children[groupPosition].length; } // 取子列表中的某一项的 View @Override public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { TextView textView = getGenericView(); textView.setText(getChild(groupPosition, childPosition).toString()); return textView; } @Override public Object getGroup(int groupPosition) { return groups[groupPosition]; } @Override public int getGroupCount() { return groups.length; } @Override public long getGroupId(int groupPosition) { return groupPosition; } // 取父列表中的某一项的 View @Override public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { TextView textView = getGenericView(); textView.setText(getGroup(groupPosition).toString()); return textView; } @Override public boolean hasStableIds() { return true; } @Override public boolean isChildSelectable(int groupPosition, int childPosition) { return true; } // 获取某一项的 View 的逻辑 private TextView getGenericView() { AbsListView.LayoutParams lp = new AbsListView.LayoutParams( ViewGroup.LayoutParams.FILL_PARENT, 48); TextView textView = new TextView(_ExpandableList.this); textView.setLayoutParams(lp); textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT); textView.setPadding(32, 0, 0, 0); return textView; } } }
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