什么是ACTION_CANCEL和ACTION_UP为MotionEvent之间的不同 [英] What's the different between ACTION_CANCEL and ACTION_UP for MotionEvent
问题描述
我想跟踪在屏幕上fingure平局。所以，我所做的是开始录制时motionEvent ACTION_DOWN的位置。但是，我怎么能决定时动作完成，在Action_cancel或Action_up？
I want to track a fingure draw on the screen. So what i did is to start recording the position when motionEvent Action_down. But how can I decide when the action is finish, at Action_cancel, or Action_up?
什么是确切的不同ACTION_CANCEL和ACTION_UP之间？
What's the exact different between ACTION_CANCEL and ACTION_UP?
感谢您的意见。
推荐答案
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ACTION_UP：一个pressed手势完成，运动包含了最终版的位置，以及自上向下的任何中间点或移动事件
ACTION_UP: A pressed gesture has finished, the motion contains the final release location as well as any intermediate points since the last down or move event.
ACTION_CANCEL：目前的姿态已中止
ACTION_CANCEL: The current gesture has been aborted.
当父占有的运动，例如当用户已经足够拖累整个列表视图，它会开始滚动，而不是让你preSS的按钮它里面发生ACTION_CANCEL。你可以找到更多关于它在的ViewGroup文档：<一href="http://developer.android.com/reference/android/view/ViewGroup.html#onInterceptTouchEvent%28android.view.MotionEvent%29">onInterceptTouchEvent.
ACTION_CANCEL occurs when the parent takes possession of the motion, for example when the user has dragged enough across a list view that it will start scrolling instead of letting you press the buttons inside of it. You can find out more about it at the viewgroup documentation: onInterceptTouchEvent.
所以用ACTION_CANCEL时的动作拖出母公司和ACTION_UP不然。
so use ACTION_CANCEL when the action is dragged out of the parent, and ACTION_UP otherwise.
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