一篇文章彻底搞懂Android事件分发机制

) target.mLeft;

final float yc = scrolledYFloat - (float) target.mTop;

mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT;

ev.setAction(MotionEvent.ACTION_CANCEL);

ev.setLocation(xc, yc);

if (!target.dispatchTouchEvent(ev)) {

}

// clear the target

mMotionTarget = null;

// Don't dispatch this event to our own view, because we already

// saw it when intercepting; we just want to give the following

// event to the normal onTouchEvent().

return true;

}

if (isUpOrCancel) {

mMotionTarget = null;

}

// finally offset the event to the target's coordinate system and

// dispatch the event.

final float xc = scrolledXFloat - (float) target.mLeft;

final float yc = scrolledYFloat - (float) target.mTop;

ev.setLocation(xc, yc);

if ((target.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) {

ev.setAction(MotionEvent.ACTION_CANCEL);

target.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT;

mMotionTarget = null;

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