第四十五讲：用户界面 View（十二）
>本讲内容：ImageSwitcher 图片切换器 和 TextSwitcher 文本切换器源代码下载：http://www.apkbus.com/data/attachment/forum/201104/29/1812544hwvj8ily84g8zgy.jpg3、在main.xml中添加一个ImageSwitcher组件： <?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">
<imageswitcher android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/imageSwitcher1">
</imageswitcher>
</linearlayout>4、在MainActivity.java中的代码如下： package basic.android.lesson45;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.view.animation.AnimationUtils;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.ViewSwitcher.ViewFactory;
public class MainActivity extends Activity {
//当前显示的图片索引
private int index;
//图片数组
private int[] images = { R.drawable.image1, R.drawable.image2, R.drawable.image3, R.drawable.image4,
R.drawable.image5 };
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//全屏设置
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.main);
//得到ImageSwitcher对象
final ImageSwitcher is = (ImageSwitcher) findViewById(R.id.imageSwitcher1);
//实现并设置工厂内部接口的makeView方法，用来显示视图。
is.setFactory(new ViewFactory() {
@Override
public View makeView() {
return new ImageView(MainActivity.this);
}
});
//设置图片来源
is.setImageResource(images);
//设置点击监听器
is.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//点击会切换图片
index++;
if (index >= images.length) {
index = 0;
}
is.setImageResource(images);
}
});
//设置切入动画
is.setInAnimation(AnimationUtils.loadAnimation(getApplicationContext(), android.R.anim.slide_in_left));
//设置切出动画
is.setOutAnimation(AnimationUtils.loadAnimation(getApplicationContext(), android.R.anim.slide_out_right));
}
} 5、编译并运行程序，查看结果：抱歉我抓不到切换图片瞬间的截图。http://www.apkbus.com/data/attachment/forum/201104/29/181310q80sw7e42q5eq5ia.png
二、TextSwitcher 文本切换器文本的切换动画也是有一个叫TextSwitcher的类可以做到，它的使用方法和ImageSwitcher类似。至于为什么用法如此相似，还是看下面两张继承关系图吧：
http://www.apkbus.com/data/attachment/forum/201104/29/181312nimnn7an4mvdwm7w.jpghttp://www.apkbus.com/data/attachment/forum/201104/29/181313qz51fc17drr13r9o.jpg
下面直接上例子：1、新建一个项目：Lesson45_TextSwitcher2、在main.xml中添加一个TextSwitcher组件： <?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">
<textswitcher android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/textSwitcher1">
</textswitcher>
</linearlayout> 3、在MainActivity.java中的代码如下： package basic.android.lesson45;
import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.view.animation.AnimationUtils;
import android.widget.TextSwitcher;
import android.widget.TextView;
import android.widget.ViewSwitcher.ViewFactory;
public class MainActivity extends Activity {
// 索引
private int index;
// 文本数组
private String[] poemArray = { "去年今日栽", "临去见花开", "好住守空院", "夜间人不来" };
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//定义文字切换器
final TextSwitcher ts = (TextSwitcher) findViewById(R.id.textSwitcher1);
//定义视图显示工厂，并设置
ts.setFactory(new ViewFactory() {
@Override
public View makeView() {
TextView tv =new TextView(MainActivity.this);
tv.setTextSize(32);
tv.setTextColor(Color.GREEN);
return tv;
}
});
// 设置图片来源
ts.setText(poemArray);
// 设置点击监听器
ts.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// 点击会切换图片
index++;
if (index >= poemArray.length) {
index = 0;
}
ts.setText(poemArray);
}
});
// 设置切入动画
ts.setInAnimation(AnimationUtils.loadAnimation(getApplicationContext(), android.R.anim.slide_in_left));
// 设置切出动画
ts.setOutAnimation(AnimationUtils.loadAnimation(getApplicationContext(), android.R.anim.slide_out_right));
}
}
4、编译并运行程序，查看结果：
http://www.apkbus.com/data/attachment/forum/201104/29/181253wj29c99mzr6j8j9k.png
抱歉还是没法截取到切换时的场景#_#好吧，本讲就到这里，各位下次再见。</div
页:
[1]