android Animation监听器AnimationListener的使用方法)

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.view.animation.ScaleAnimation;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends Activity {

    private Button add = null;
    private Button delete = null;
    private ViewGroup viewgroup =  null;
    private ImageView imageview = null;

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

        add = (Button)findViewById(R.id.add);
        delete = (Button)findViewById(R.id.delete);
        imageview = (ImageView)findViewById(R.id.image);
        viewgroup = (ViewGroup)findViewById(R.id.main_layout);

        add.setOnClickListener(new AddOnClickListener());
        delete.setOnClickListener(new DeleteOnClickListener());
    }

    private class AddOnClickListener implements OnClickListener{

        public void onClick(View v) {
            // TODO Auto-generated method stub
            //数字后面必须全部加f，否则报错
            ScaleAnimation animation = new ScaleAnimation(0.0f, 1.0f, 0.0f, 1.0f,
                                        Animation.RELATIVE_TO_SELF, 0.5f,
                                        Animation.RELATIVE_TO_SELF, 0.5f);
            animation.setStartOffset(500);
            animation.setDuration(1000);
//            ImageView image_add = new ImageView(MainActivity.this);
//            image_add.setImageResource(R.drawable.london_olympic);
//            viewgroup.addView(image_add, new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
//            image_add.setAnimation(animation);
            //还是直接用布局文件中的ImageView比较好，否则加入的图片用后面的方法视觉上是删不掉的
            //这里是采用setImageResource方法加载图片到ImageView控件上的。
            imageview.setImageResource(R.drawable.london_olympic);
            //用ViewGroup将ImageView加载到activity中
            viewgroup.addView(imageview, new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
            //启动ImageView的Animation
            imageview.startAnimation(animation);
        }

    }

    private class  DeleteOnClickListener implements OnClickListener{

        public void onClick(View v) {
            // TODO Auto-generated method stub
            ScaleAnimation animation = new ScaleAnimation(1.0f, 0.0f, 1.0f, 0.0f,
                                        Animation.RELATIVE_TO_SELF, 0.5f,
                                        Animation.RELATIVE_TO_SELF, 0.5f);
            animation.setStartOffset(500);
            animation.setDuration(1000);
            //设置AnimationListener
            animation.setAnimationListener(new DeleteAnimationListener());
            imageview.startAnimation(animation);
        }   
    }

    private class DeleteAnimationListener implements AnimationListener{

        public void onAnimationEnd(Animation animation) {
            // TODO Auto-generated method stub
            viewgroup.removeView(imageview);
        }

        public void onAnimationRepeat(Animation animation) {
            // TODO Auto-generated method stub

        }

        public void onAnimationStart(Animation animation) {
            // TODO Auto-generated method stub

        }

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
}

   <Button
       android:id="@+id/delete"
       android:layout_width="fill_parent"
       android:layout_height="wrap_content"
       android:layout_alignParentBottom="true"
       android:text="Delete Image"
       />

   <Button
       android:id="@+id/add"
       android:layout_width="fill_parent"
       android:layout_height="wrap_content"
       android:layout_above="@+id/delete"
       android:text="Add Image" />
   <ImageView
       android:id= "@+id/image"
       android:layout_width="wrap_content"
       android:layout_height="310dip"
       android:src="@drawable/london_olympic"
       />

</RelativeLayout>