android ImageViewSwitcher简单用法

public class ImageViewSwitcherAcvitity extends Activity implements ViewFactory,OnClickListener{
   private Button button1;
   private Button button2;
   private Button button3;
   private ImageSwitcher iSwitcher;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.imageview_switcher);
		button1 = (Button) findViewById(R.id.button1);
		button2 =(Button) findViewById(R.id.button2);
		button3 = (Button) findViewById(R.id.button3);
		iSwitcher = (ImageSwitcher) findViewById(R.id.is_witcher);
		iSwitcher.setFactory(this);
		iSwitcher.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_in));
		iSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_out));
		button1.setOnClickListener(this);
		button2.setOnClickListener(this);
		button3.setOnClickListener(this);
		
	}
	@Override
	public View makeView() {
		 ImageView i = new ImageView(this); 
	        i.setBackgroundColor(0xFF000000); 
	        i.setScaleType(ImageView.ScaleType.FIT_CENTER); 
	        i.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.FILL_PARENT, 
	                LayoutParams.FILL_PARENT)); 
	        return i; 
	}
	@Override
	public void onClick(View v) {
		switch (v.getId()) {
		case R.id.button1:
			iSwitcher.setImageResource(R.drawable.big1);
			break;
		case R.id.button2:
			iSwitcher.setImageResource(R.drawable.big2);
			break;
		case R.id.button3:
			iSwitcher.setImageResource(R.drawable.big3);
			break;
		default:
			break;
		}
	}

}

  xml:

<?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" >
	<LinearLayout 
	     android:layout_width="fill_parent"
	    android:layout_height="wrap_content"
	    android:orientation="horizontal" >
	    	 <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" />

    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" />
	</LinearLayout>
   <ImageSwitcher 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/is_witcher">
   </ImageSwitcher>

</LinearLayout>