android touch event summary

最新推荐文章于 2024-09-30 16:38:38 发布

rx_wen

最新推荐文章于 2024-09-30 16:38:38 发布

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分类专栏： android 文章标签： android events button up

本文链接：https://blog.youkuaiyun.com/rx_wen/article/details/5960947

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本文详细阐述了Android中触摸事件如何传递给父视图，点击和长按事件与触摸事件之间的紧密关系，特别指出按钮组件不传递事件到其父组件，并解释了点击事件仅在触摸事件处理器返回false时触发的机制。

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In " implement drag and drop on android", I wrote the rules how touch event can be passed to the touched view's parent, and how a parent can intercept the touched view's event. On a device without mouse, Click and LongClicked events are also strongly related to touch event. So, I'll summarize how they are related.

Button widget doesn't bubble event. If a button is touched, it doesn't pass the event to its parent in any case. (There should be more widgets exhibit this character.)
Touch event doesn't bubble up to parent if the widget also registers Click or LongClick event handler.
If a widget registers both Touch and Click event handler, Click event fires only when Touch event handler returns false. In other words, Click event gets fired only when touch event handler declares it's not interested in the touch event.
If a widget registers both Click and LongClick event handler, and LongClick event get fired. Click event will be fired only if LongClick event handler returns false.

Testing Code:
http://code.google.com/p/rxwen-blog-stuff/source/browse/trunk/android/touch_events/