Android 碎屏效果 (Crack Screen,击碎屏幕)

本文介绍一个好玩的App 如图：

Android 碎屏效果 (Crack Screen,击碎屏幕)_第1张图片

实现思路：在一个透明的Activity上用一个自定义View，然后在View上画.9的碎玻璃图片，加上音效。然后过一段时间消失。

主要用一个postInvalidate();方法，用一个集合去装手指触摸过的地方，在touch事件中调用postInvalidate();方法进行视图重新绘制。

需要注意的是，这里的播放音效和上篇博客Android 闪电效果 (Electric Screen,电动屏幕)中的播放音效一样，暂停音效的时候要传开始播放时得到的int返回值，和停止音效不一样。

可以通过限制集合长度来限制绘制的屏幕个数。

单独开启一个线程，过一段时间开始清除效果，即直接操作集合，操作完了调用postInvalidate(); 重新绘图就可以了。

示例代码：

public class CustomView extends View {private Paint mPaint;private SoundPool mSoundPool;private Map<Integer, Integer> mSoundMap = new HashMap<Integer, Integer>();private int mIndex;private Bitmap mBitmap;private ArrayList<Float> mXPointList;private ArrayList<Float> mYPointList;private int mCount = 0;// 点击次数private int mLength = 30;// 绘制总数public CustomView(Context context, AttributeSet attrs) {super(context);mPaint = new Paint();mPaint.setAntiAlias(true);mPaint.setColor(Color.BLUE);// mPaint.setAlpha(127);mPaint.setStrokeWidth(2.0f);this.setKeepScreenOn(true);this.setFocusable(true);this.setLongClickable(true);this.mSoundPool = new SoundPool(5, AudioManager.STREAM_SYSTEM, 5);this.mSoundMap.put(1, mSoundPool.load(context, R.raw.cfokwowbfv, 1));this.mBitmap = BitmapFactory.decodeResource(getResources(),R.drawable.screen);mXPointList = new ArrayList<Float>();mYPointList = new ArrayList<Float>();new Thread(new Runnable() {@Overridepublic void run() {// TODO Auto-generated method stubwhile (true) {try {Thread.sleep(4000);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}// mG++;handler.sendEmptyMessage(0);}}}).start();}@Overridepublic boolean onTouchEvent(MotionEvent arg1) {// TODO Auto-generated method stubswitch (arg1.getAction()) {case MotionEvent.ACTION_DOWN:// drawBitmap(arg1.getX(), arg1.getY());playSound();mXPointList.add(arg1.getX());mYPointList.add(arg1.getY());postInvalidate();mCount++;if (mCount > mLength) {mXPointList.remove(0);mYPointList.remove(0);mLength++;}break;case MotionEvent.ACTION_UP:break;case MotionEvent.ACTION_MOVE:break;default:break;}return super.onTouchEvent(arg1);}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);for (int i = 0; i < mXPointList.size(); ++i) {canvas.drawBitmap(mBitmap, mXPointList.get(i) - mBitmap.getWidth()/ 2, mYPointList.get(i) - mBitmap.getHeight() / 2, null);}}// 播放public void playSound() {mIndex = mSoundPool.play(mSoundMap.get(1), 1, 1, 0, 0, 1);}// 停止播放public void stopSound() {// Toast.makeText(getContext(), "zzzzz", 0).show();mSoundPool.stop(mIndex);}@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {// TODO Auto-generated method stubToast.makeText(getContext(), "keydown", Toast.LENGTH_SHORT).show();return super.onKeyDown(keyCode, event);}// 更新界面Handler handler = new Handler() {public void handleMessage(Message msg) {if (msg.what == 0) {if (mCount != 0 && mXPointList.size() != 0) {for (int i = 0; i < new Random().nextInt(mXPointList.size() + 1); i++) {mXPointList.remove(0);mYPointList.remove(0);mLength++;}}postInvalidate();}}};}

Github:https://github.com/OneHead/crack_screen2D

Weibo:http://weibo.com/2382477985

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