Android 简单的 左右上下手势 判断，android手势,private floa

Android 简单的 左右上下手势 判断，android手势,private floa

private float startx;    private float starty;    private float upoffset;    @Override    public boolean onTouchEvent(MotionEvent event) {        switch (event.getAction()) {        case MotionEvent.ACTION_DOWN:            startx = event.getX();            starty = event.getY();            break;        case MotionEvent.ACTION_MOVE:            offset = (int) (event.getX() - startx) / 3;            // Log.e("TAST", offset + "offset");            if (Math.abs(offset) > 10) {                Log.e("TAG", "Left and Right");            }            upoffset = event.getY() - starty;            if (Math.abs(upoffset) > 20) {                Log.e("TAG", "UP and Down");            }            invalidate();        default:            break;        }        return true;    }