SurfaceView实现红包雨平移动画

public class TranslateSurfaceView extends SurfaceView implements DrawInterface {
private DrawHandler drawHandler;
private int width;
private int height;
private Bitmap bitmap;
private int bitmapWidth;
private int bitmapHeight;
private Toast toast;
private int count = 0;
private ArrayList<MoveModel  moveList = new ArrayList< ();
public TranslateSurfaceView(Context context) {
this(context, null);
}
public TranslateSurfaceView(Context context, AttributeSet attrs) {
this(context, attrs, -1);
}
public TranslateSurfaceView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
SurfaceHolder holder = getHolder();
setZOrderOnTop(true);
holder.setFormat(PixelFormat.TRANSLUCENT);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
width = getMeasuredWidth();
height = getMeasuredHeight();
}
public void prepare() {
DrawThread drawThread = new DrawThread();
drawThread.start();
drawHandler = new DrawHandler(drawThread.getLooper(), this);
bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.icon_redenvelope2);
bitmapWidth = bitmap.getWidth();
bitmapHeight = bitmap.getHeight();
}
public void addMoveModel(MoveModel moveModel) {
moveList.add(moveModel);
}
public void start() {
count = 0;
moveList.clear();
for (int i = 0; i < 10; i++) {
generateModel();
}
drawHandler.sendEmptyMessage(DrawHandler.START_DRAW_KEY);
}
public void resume() {
drawHandler.sendEmptyMessage(DrawHandler.START_DRAW_KEY);
}
public void pause() {
drawHandler.sendEmptyMessage(DrawHandler.STOP_DRAW_KEY);
}
public void quit() {
if (null != bitmap) {
bitmap.recycle();
}
if (null != drawHandler) {
drawHandler.removeCallbacksAndMessages(null);
drawHandler.getLooper().quit();
}
}
@Override
public void startDraw() {
SurfaceHolder holder = getHolder();
Canvas canvas = holder.lockCanvas();
if (null == canvas) {
return;
}
Paint paint = new Paint();
paint.setAntiAlias(true);
canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
for (MoveModel moveModel : moveList) {
canvas.drawBitmap(bitmap, moveModel.x, moveModel.y, paint);
if (moveModel.x   width || moveModel.y   height) {
resetMoveModel(moveModel);
} else {
moveModel.y += moveModel.randomY;
}
}
holder.unlockCanvasAndPost(canvas);
drawHandler.sendEmptyMessage(DrawHandler.START_DRAW_KEY);
}
@Override
public void stopDraw() {
drawHandler.removeMessages(DrawHandler.START_DRAW_KEY);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
int action = event.getActionMasked();
switch (action) {
case MotionEvent.ACTION_DOWN:
checkInRect((int) event.getX(), (int) event.getY());
break;
}
return true;
}
/**
* 是否点击在红包区域
* @param x
* @param y
*/
private void checkInRect(int x, int y) {
int length = moveList.size();
for (int i = 0; i < length; i++) {
MoveModel moveModel = moveList.get(i);
Rect rect = new Rect((int) moveModel.x, (int) moveModel.y, (int) moveModel.x + bitmapWidth, (int) moveModel.y + bitmapHeight);
if (rect.contains(x, y)) {
count++;
resetMoveModel(moveModel);
if (toast == null) {
toast = Toast.makeText(getContext(), "", Toast.LENGTH_SHORT);
}
toast.setText("抢到红包" + count);
toast.show();
break;
}
}
}
private void resetMoveModel(MoveModel moveModel) {
Random random = new Random();
moveModel.x = random.nextInt(11) * (width / 10);
moveModel.y = 0;
moveModel.randomY = (random.nextInt(5) + 2) * getResources().getDisplayMetrics().density * 1.4f;
}
private void generateModel() {
Random random = new Random();
MoveModel moveModel = new MoveModel();
moveModel.moveId = moveList.size() + 1;
moveModel.x = random.nextInt(11) * (width / 10);
moveModel.y = 0;
moveModel.randomY = (random.nextInt(5) + 2) * getResources().getDisplayMetrics().density * 1.4f;
moveList.add(moveModel);
}
}