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Android Event 事件传递机制 #4

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zhangsr opened this issue Nov 27, 2015 · 0 comments

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zhangsr commented Nov 27, 2015

原理流程图：

dispatchTouchEvent() 负责如何传递触摸事件

包括传递给onTouch() 还是 onTouchEvent()
标记DOWN的后续事件传递给哪个View

onInterceptTouchEvent() 负责如何拦截触摸事件

判断是否已经detach并拦截
判断是否开始滑动并拦截

onTouchEvent() 负责如何处理触摸事件

获取焦点
设置按下状态
调用onClick()

自定义View

	dispatchTouchEvent()	onInterceptTouchEvent()	onTouchEvent()
SomeView	不重写，用View的默认实现	无	重写
SomeViewGroup	一般不重写，用ViewGroup的默认实现	重写，默认返回false	（1）不重写，用View的默认实现如LinearLayout；（2）重写，如ListView

常见问题

onTouch() vs onTouchEvent()

两者都用以处理触摸事件
前者给View的用户使用，后者是View自身的逻辑
前者先调用，如果消费了事件，不调用后者

参考

http://wangkuiwu.github.io/2015/01/01/TouchEvent-Introduce/ 系列
http://blog.csdn.net/guolin_blog/article/details/9097463 系列

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