android ImageSwitcher

<span style="font-size:14px;">import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.ActionBar.LayoutParams;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.GridView;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.SimpleAdapter;
import android.widget.ViewSwitcher.ViewFactory;

import com.example.android_lb_day3_ui.R;

public class ImageSwitcherTest extends Activity {
     int imgIds[] = new int[] { R.drawable.animal_01, R.drawable.animal_02,
               R.drawable.animal_03, R.drawable.animal_04, R.drawable.animal_05,
               R.drawable.animal_01, R.drawable.animal_02, R.drawable.animal_03,
               R.drawable.animal_04, R.drawable.animal_05, R.drawable.animal_01,
               R.drawable.animal_02, };
     ImageSwitcher switcher;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
          // TODO Auto-generated method stub
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_switcher);
          List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
          for (int i = 0; i < imgIds.length; i++) {
               Map<String, Object> map = new HashMap<String, Object>();
               map.put("image", imgIds[i]);
               list.add(map);
          }

          switcher = (ImageSwitcher) findViewById(R.id.imageSwitcher);
          // 为ImageSwitcher设置切换的动画效果
          switcher.setFactory(new ViewFactory() {

               @Override
               public View makeView() {
                    ImageView image = new ImageView(ImageSwitcherTest.this);
                    image.setScaleType(ImageView.ScaleType.FIT_CENTER);// 设置图片缩放比例
                    image.setLayoutParams(new ImageSwitcher.LayoutParams(
                              160, 160));
                    return image;
               }
          });
          SimpleAdapter adapter = new SimpleAdapter(this, list,
                    R.layout.swticher_img, new String[] { "image" },
                    new int[] { R.id.swticher_img });
          GridView grid = (GridView) findViewById(R.id.gridView);
          grid.setAdapter(adapter);
          // 被选中的事件
          grid.setOnItemSelectedListener(new OnItemSelectedListener() {
               @Override
               public void onItemSelected(AdapterView<?> arg0, View arg1,
                         int position, long id) {
                    switcher.setImageResource(imgIds[position]);

               }

               @Override
               public void onNothingSelected(AdapterView<?> arg0) {
                    // TODO Auto-generated method stub

               }
          });
          // 呗单机的事件
          grid.setOnItemClickListener(new OnItemClickListener() {
               @Override
               public void onItemClick(AdapterView<?> parent, View view,
                         int position, long id) {
                    switcher.setImageResource(imgIds[position]);

               }
          });
     }

}</span>

<?xml version="1.0" encoding= "utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <GridView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:horizontalSpacing="pt"
        android:numColumns="4"
        android:verticalSpacing="2pt"
        android:id="@+id/gridView" >
    </GridView >

    <ImageSwitcher
        android:layout_width="300dp"
        android:layout_height="300dp"
        android:layout_gravity="center_horizontal"
        android:inAnimation="@android:anim/fade_in"
        android:outAnimation="@android:anim/fade_out"
        android:id="@+id/imageSwitcher" >
    </ImageSwitcher >

</LinearLayout>