关于Drawable动画效果的实现demo

直接上代码把,上面都写了很清楚的注释: 

package com.ray.bubble;

import android.app.Activity;
import android.content.Context;
import android.graphics.drawable.AnimationDrawable;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.view.View.OnTouchListener;
import android.widget.FrameLayout;
import android.widget.ImageView;

public class BubbleExplosion extends Activity {
    private FrameLayout parentLayout;
    private ExplosionView customView;
    private AnimationDrawable exa1;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // 设置无标题栏,全屏效果
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);

        // 代码创建一个FrameLayout,设置背景图片
        parentLayout = new FrameLayout(this);
        parentLayout.setBackgroundResource(R.drawable.bg);

        // 代码创建一个自定义ImageView,并添加到上面的FrameLayout当中
        // 并且设置这个ImageView有个动画的背景效果,
        // 设置为不可见
        customView = new ExplosionView(this);
        customView.setVisibility(View.INVISIBLE);
        customView.setBackgroundResource(R.anim.explosion);

        // 获取动画效果背景的图像
        exa1 = (AnimationDrawable) customView.getBackground();

        parentLayout.addView(customView);
        // 设置页面点击监听
        parentLayout.setOnTouchListener(new LayoutListener());
        setContentView(parentLayout);
    }

    class ExplosionView extends ImageView {
        public ExplosionView(Context context) {
            super(context);
        }

        // handle the location of the explosion
        public void setLocation(int top, int left) {
            this.setFrame(left, top, left + 40, top + 40);
        }
    }

    class LayoutListener implements OnTouchListener {
        public boolean onTouch(View v, MotionEvent event) {
            // first u have to stop the animation,or if the animation
            // is starting ,u can start it again!
            customView.setVisibility(View.INVISIBLE);
             // 如果动画已在运行,则不起效果
            exa1.stop();
            float x = event.getX();
            float y = event.getY();
            // 重新定位ImageView在layout上的坐标位置
            customView.setLocation((int) y - 20, (int) x - 20);
            customView.setVisibility(View.VISIBLE);
            exa1.start();
            return false;
        }

    }
}

还有重要的就是这个anim文件夹中的explosion.xml 

<animation-list xmlns:android="http://schemas.android.com/apk/res/android"
    android:oneshot="true">
    <item android:drawable="@drawable/explode1" android:duration="50" />
    <item android:drawable="@drawable/explode2" android:duration="50" />
    <item android:drawable="@drawable/explode3" android:duration="50" />
    <item android:drawable="@drawable/explode4" android:duration="50" />
</animation-list>