Android控件之Spinner探究

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