仿Android 5.0按钮点击效果

public class MyImageView extends ImageView { private float pointX = 0f; private float pointY = 0f; private int count = 1; private Paint paint; private boolean isDraw = false; public MyImageView(Context context) { super(context); init(); } public MyImageView(Context context, AttributeSet attrs) { super(context, attrs); init(); } public JImageView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); init(); } /** * 初始化 */ private void init() { paint = new Paint(); paint.setAntiAlias(true); paint.setColor(0x35333333); } @Override protected void onDraw(Canvas canvas) { if (isDraw) { count += 2; canvas.drawCircle(pointX, pointY, count, paint); postInvalidateDelayed(16); } super.onDraw(canvas); } @Override @SuppressLint("ClickableViewAccessibility") public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: isDraw = true; pointX = event.getX(); pointY = event.getY(); postInvalidate(); break; case MotionEvent.ACTION_UP: case MotionEvent.ACTION_MOVE: case MotionEvent.ACTION_CANCEL: isDraw = false; count = 1; break; } return true; } }