在做Android游戏MagicBubble开发的时候,在连通两个Bubbles的时候,Bubble会以水泡爆破的情形消
失。笔者的思路是这样的:在FrameLayout里面加入一ImageView,再定义一个爆炸的Animation,不需
要的时候,ImageView就隐藏起来,需要的时候,就把ImageView移动到需要的地方,再StartAnimation,
这样,就可以实现爆炸效果。下面是简化后的程序的代码,程序的效果如下:点中屏幕中任意地方,就在点击
地方显示爆炸效果。
首先是Animation的定义,定义一个Frame Animation,依次播放5帧动画,每帧动画持续时间为50毫秒:
< 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" /> < item android:drawable ="@drawable/explode5" android:duration ="50" /> </ animation-list >
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); } // 处理爆炸的位置 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) { // 首先,你必须停止播放动画,如果动画开始,你不能重复一遍! 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 ; } } }
配合Android的SurfaceView,Animation可以实现很好的过渡效果,SurfaceView的用法很简单。