android开发如何学习

goman · 发表于 2013-8-28 16:29

0以下模拟下拉列表的用法
布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:id="@+id/LinearLayout01"
android:layout_width="fill_parent" android:layout_height="fill_parent"
android:orientation="vertical"
xmlns:android="http://schemas.android.com/apk/res/android">
<TextView android:text="@string/ys"
      android:id="@+id/TextView01"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:textSize="28dip" />
<Spinner android:id="@+id/Spinner01"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content" />
</LinearLayout>

SpinnerActivity类

package com.ljq.sp;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.AdapterView.OnItemSelectedListener;

public class SpinnerActivity extends Activity {
private Spinner sp = null;//下拉列表
private TextView tv = null;
// 所有资源图片的数组
private int[] drawableIds={R.drawable.football,R.drawable.basketball,R.drawable.volleyball};
// 所有字符串的数组
private int[] msgIds={R.string.zq,R.string.lq,R.string.pq};

@Override
public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.mAIn);

      tv = (TextView) findViewById(R.id.TextView01);
      sp=(Spinner)this.findViewById(R.id.Spinner01);//初始化Spinner
      sp.setAdapter(adapter);
      sp.setOnItemSelectedListener(new OnItemSelectedListener() {
         public void onItemSelected(AdapterView<?> parent, View view, int positon, long id) {
            LinearLayout ll = (LinearLayout) view;
            View v=ll.getChildAt(0);//获取第一个控件ImageView
            Log.i("ljq", v.geTCLass().getName());
            TextView tvn = (TextView) ll.getChildAt(1);//获取第二个控件TextView
            StringBuilder sb = new StringBuilder();
            sb.append(getResources().getText(R.string.ys)).append(":").append(tvn.getText());
            tv.setText(sb.toString());
         }

         public void onNothingSelected(AdapterView<?> parent) {

         }
      });
}

private BaseAdapter adapter = new BaseAdapter(){
      public int getCount() {
         return drawableIds.length;
      }

      public Object getItem(int position) {
         return drawableIds[position];
      }

      public long getItemId(int position) {
         return position;
      }

      public View getView(int position, View convertView, ViewGroup parent) {
         LinearLayout ll = new LinearLayout(SpinnerActivity.this);
         ll.setOrientation(LinearLayout.HORIZONTAL);

         ImageView iv = new ImageView(SpinnerActivity.this);
         iv.setImageResource(drawableIds[position]);
         ll.addView(iv);

         TextView tv=new TextView(SpinnerActivity.this);
         tv.setText(msgIds[position]);//设置内容
         tv.setTextSize(24);
         tv.setTextColor(R.color.black);
         ll.addView(tv);
         return ll;
      }
};
}

运行结果

分类: android常用控件

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