Android中activity触摸操作dispatchTouchEvent

Android中activity触摸操作dispatchTouchEvent

触摸事件先进行此操作

float downX = 0, downY = 0;@Overridepublic boolean dispatchTouchEvent(MotionEvent ev) {    switch (ev.getAction()){        case MotionEvent.ACTION_DOWN :            downX = ev.getX();            downY = ev.getY();            break;        case MotionEvent.ACTION_MOVE:            break;        case MotionEvent.ACTION_UP:            break;    }    return super.dispatchTouchEvent(ev);}