onInterceptTouchEvent和onTouchEvent调用时序(转)

这个有参考意义,先记一下。呵呵 http://blog.csdn.net/ddna/article/details/5473293

  1. 1.       onInterceptTouchEvent()处理down事件均返回falseonTouchEvent()处理事件均返回true

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04-11 03:58:42.620: DEBUG/LayoutView1(614): onInterceptTouchEvent action:ACTION_DOWN

04-11 03:58:42.620: DEBUG/LayoutView2(614): onInterceptTouchEvent action:ACTION_DOWN

04-11 03:58:42.620: DEBUG/MyTextView(614): onTouchEvent action:ACTION_DOWN

04-11 03:58:42.800: DEBUG/LayoutView1(614): onInterceptTouchEvent action:ACTION_MOVE

04-11 03:58:42.800: DEBUG/LayoutView2(614): onInterceptTouchEvent action:ACTION_MOVE

04-11 03:58:42.800: DEBUG/MyTextView(614): onTouchEvent action:ACTION_MOVE

…… //省略过多的ACTION_MOVE

04-11 03:58:43.130: DEBUG/LayoutView1(614): onInterceptTouchEvent action:ACTION_UP

04-11 03:58:43.130: DEBUG/LayoutView2(614): onInterceptTouchEvent action:ACTION_UP

04-11 03:58:43.150: DEBUG/MyTextView(614): onTouchEvent action:ACTION_UP

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这是最常见的情况,onInterceptTouchEvent并没有做任何改变事件传递时序的操作,效果上和没有覆写该方法是一样的。可以看到,各种事件的传递本身是自底向上的,次序是:LayoutView1->LayoutView2->MyTextView。注意,在onInterceptTouchEvent均返回false时,LayoutView1LayoutView2onTouchEvent并不会收到事件,而是最终传递给了MyTextView。

 

  1. 2.     LayoutView1onInterceptTouchEvent()处理down事件返回true

MyTextViewonTouchEvent()处理事件返回true

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04-11 03:09:27.589: DEBUG/LayoutView1(446): onInterceptTouchEvent action:ACTION_DOWN

04-11 03:09:27.589: DEBUG/LayoutView1(446): onTouchEvent action:ACTION_DOWN

04-11 03:09:27.629: DEBUG/LayoutView1(446): onTouchEvent action:ACTION_MOVE

04-11 03:09:27.689: DEBUG/LayoutView1(446): onTouchEvent action:ACTION_MOVE

…… //省略过多的ACTION_MOVE

04-11 03:09:27.959: DEBUG/LayoutView1(446): onTouchEvent action:ACTION_UP

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从Log可以看到,由于LayoutView1在拦截第一次down事件时return true,所以后续的事件(包括第一次的down)将由LayoutView1本身处理,事件不再传递下去。

 

  1. LayoutView1LayoutView2onInterceptTouchEvent()处理down事件返回false

MyTextViewonTouchEvent()处理事件返回false

LayoutView2onTouchEvent()处理事件返回true

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04-11 09:50:21.147: DEBUG/LayoutView1(301): onInterceptTouchEvent action:ACTION_DOWN

04-11 09:50:21.147: DEBUG/LayoutView2(301): onInterceptTouchEvent action:ACTION_DOWN

04-11 09:50:21.147: DEBUG/MyTextView(301): onTouchEvent action:ACTION_DOWN

04-11 09:50:21.147: DEBUG/LayoutView2(301): onTouchEvent action:ACTION_DOWN

04-11 09:50:21.176: DEBUG/LayoutView1(301): onInterceptTouchEvent action:ACTION_MOVE

04-11 09:50:21.176: DEBUG/LayoutView2(301): onTouchEvent action:ACTION_MOVE

04-11 09:50:21.206: DEBUG/LayoutView1(301): onInterceptTouchEvent action:ACTION_MOVE

04-11 09:50:21.217: DEBUG/LayoutView2(301): onTouchEvent action:ACTION_MOVE

…… //省略过多的ACTION_MOVE

04-11 09:50:21.486: DEBUG/LayoutView1(301): onInterceptTouchEvent action:ACTION_UP

04-11 09:50:21.486: DEBUG/LayoutView2(301): onTouchEvent action:ACTION_UP

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可以看到,由于MyTextView在onTouchEvent()中return false,down事件被传递给其父view,即LayoutView2的onTouchEvent()方法处理,由于在LayoutView2的onTouchEvent()中return true,所以down事件传递并没有上传到LayoutView1。注意,后续的moveup事件均被传递给LayoutView2onTouchEvent()处理,而没有传递给MyTextView

 

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