android气泡动画实现

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 fl; private ExplosionView exv1; private AnimationDrawable exa1; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //set full screen requestWindowFeature(Window.FEATURE_NO_TITLE); getWindow().setFlags(WindowManager.LayoutParams. FLAG_FULLSCREEN , WindowManager.LayoutParams. FLAG_FULLSCREEN); fl = new FrameLayout(this); fl.setBackgroundResource(R.drawable.bg); exv1 = new ExplosionView(this); exv1.setVisibility(View.INVISIBLE); exv1.setBackgroundResource(R.anim.explosion); exa1 = (AnimationDrawable)exv1.getBackground(); fl.addView(exv1); fl.setOnTouchListener(new LayoutListener()); setContentView(fl); } 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! exv1.setVisibility(View.INVISIBLE); exa1.stop(); float x = event.getX(); float y = event.getY(); exv1.setLocation((int)y-20, (int)x-20); exv1.setVisibility(View.VISIBLE); exa1.start(); return false; } } }