安卓触摸事件探究

参考,http://blog.csdn.net/chunqiuwei/article/details/41084921

/** * 第一步，dispatchTouchEvent， *          false：结束 *          true：到onInterceptTouchEvent *              第二步：到onInterceptTouchEvent， *                  true：到viewGroup的onTouchEvent *                  false：到View dispatchTouchEvent *                      第三步：View dispatchTouchEvent *                          第四步：View onTouchEvent *                                true：view消费touch事件，viewGroup不能消费 *                                false：viewGroup决定是否消费touch事件 * * * @param ev * @return */

例子原型
MyLinearLayout包含一个MyView
情况一,

MyLinearLayout,　　　　dispatchTouchEvent返回false　　　　onInterceptTouchEvent返回false　　　　onTouchEvent返回falseMyView　　　　dispatchTouchEvent返回false　　　　　　onTouchEvent返回false

结果

03-18 15:26:00.726    6884-6884/com.example.myapp D/zyr﹕ A DIS ACTION_DOWN03-18 15:26:00.726    6884-6884/com.example.myapp D/zyr﹕ A INT ACTION_DOWN03-18 15:26:00.726    6884-6884/com.example.myapp E/zyr﹕ B DIS ACTION_DOWN03-18 15:26:00.726    6884-6884/com.example.myapp E/zyr﹕ B TOU ACTION_DOWN03-18 15:26:00.726    6884-6884/com.example.myapp D/zyr﹕ A TOU ACTION_DOWN03-18 15:26:05.396    6884-6884/com.example.myapp D/zyr﹕ A DIS ACTION_DOWN03-18 15:26:05.396    6884-6884/com.example.myapp D/zyr﹕ A INT ACTION_DOWN03-18 15:26:05.396    6884-6884/com.example.myapp E/zyr﹕ B DIS ACTION_DOWN03-18 15:26:05.396    6884-6884/com.example.myapp E/zyr﹕ B TOU ACTION_DOWN03-18 15:26:05.396    6884-6884/com.example.myapp D/zyr﹕ A TOU ACTION_DOWN

结论

由图,没有view消费本次触摸事件,Action_Move事件根本传递不进来

情况二,

MyLinearLayout,　　　　dispatchTouchEvent返回false　　　　onInterceptTouchEvent返回false　　　　onTouchEvent返回falseMyView　　　　dispatchTouchEvent返回false　　　　　　onTouchEvent返回true

结果

03-18 15:36:33.641  10292-10292/com.example.myapp D/zyr﹕ A DIS ACTION_DOWN03-18 15:36:33.641  10292-10292/com.example.myapp D/zyr﹕ A INT ACTION_DOWN03-18 15:36:33.641  10292-10292/com.example.myapp E/zyr﹕ B DIS ACTION_DOWN03-18 15:36:33.641  10292-10292/com.example.myapp E/zyr﹕ B TOU ACTION_DOWN03-18 15:36:33.676  10292-10292/com.example.myapp D/zyr﹕ A DIS ACTION_MOVE03-18 15:36:33.676  10292-10292/com.example.myapp D/zyr﹕ A INT ACTION_MOVE03-18 15:36:33.676  10292-10292/com.example.myapp E/zyr﹕ B DIS ACTION_MOVE03-18 15:36:33.676  10292-10292/com.example.myapp E/zyr﹕ B TOU ACTION_MOVE03-18 15:36:33.691  10292-10292/com.example.myapp D/zyr﹕ A DIS ACTION_MOVE03-18 15:36:33.691  10292-10292/com.example.myapp D/zyr﹕ A INT ACTION_MOVE03-18 15:36:33.691  10292-10292/com.example.myapp E/zyr﹕ B DIS ACTION_MOVE03-18 15:36:33.691  10292-10292/com.example.myapp E/zyr﹕ B TOU ACTION_MOVE03-18 15:36:33.711  10292-10292/com.example.myapp D/zyr﹕ A DIS ACTION_MOVE03-18 15:36:33.711  10292-10292/com.example.myapp D/zyr﹕ A INT ACTION_MOVE03-18 15:36:33.711  10292-10292/com.example.myapp E/zyr﹕ B DIS ACTION_MOVE03-18 15:36:33.711  10292-10292/com.example.myapp E/zyr﹕ B TOU ACTION_MOVE03-18 15:36:33.721  10292-10292/com.example.myapp D/zyr﹕ A DIS ACTION_MOVE03-18 15:36:33.721  10292-10292/com.example.myapp D/zyr﹕ A INT ACTION_MOVE03-18 15:36:33.721  10292-10292/com.example.myapp E/zyr﹕ B DIS ACTION_MOVE03-18 15:36:33.721  10292-10292/com.example.myapp E/zyr﹕ B TOU ACTION_MOVE03-18 15:36:33.721  10292-10292/com.example.myapp D/zyr﹕ A DIS ACTION_UP03-18 15:36:33.721  10292-10292/com.example.myapp D/zyr﹕ A INT ACTION_UP03-18 15:36:33.721  10292-10292/com.example.myapp E/zyr﹕ B DIS ACTION_UP03-18 15:36:33.721  10292-10292/com.example.myapp E/zyr﹕ B TOU ACTION_UP

结论

MyView消费ACTION_DOWN,之后ACTION_MOVE传递进来,消费ACTION_MOVE,ACTION_UP同理

 情况三,

MyLinearLayout,　　　　dispatchTouchEvent返回false　　　　onInterceptTouchEvent返回false　　　　onTouchEvent返回trueMyView　　　　dispatchTouchEvent返回false　　　　　　onTouchEvent返回true

结果

03-18 15:40:18.056  29163-29163/com.example.myapp D/zyr﹕ A DIS ACTION_DOWN03-18 15:40:18.056  29163-29163/com.example.myapp D/zyr﹕ A INT ACTION_DOWN03-18 15:40:18.056  29163-29163/com.example.myapp E/zyr﹕ B DIS ACTION_DOWN03-18 15:40:18.056  29163-29163/com.example.myapp E/zyr﹕ B TOU ACTION_DOWN03-18 15:40:18.076  29163-29163/com.example.myapp D/zyr﹕ A DIS ACTION_MOVE03-18 15:40:18.076  29163-29163/com.example.myapp D/zyr﹕ A INT ACTION_MOVE03-18 15:40:18.076  29163-29163/com.example.myapp E/zyr﹕ B DIS ACTION_MOVE03-18 15:40:18.076  29163-29163/com.example.myapp E/zyr﹕ B TOU ACTION_MOVE03-18 15:40:18.096  29163-29163/com.example.myapp D/zyr﹕ A DIS ACTION_MOVE03-18 15:40:18.096  29163-29163/com.example.myapp D/zyr﹕ A INT ACTION_MOVE03-18 15:40:18.096  29163-29163/com.example.myapp E/zyr﹕ B DIS ACTION_MOVE03-18 15:40:18.096  29163-29163/com.example.myapp E/zyr﹕ B TOU ACTION_MOVE03-18 15:40:18.111  29163-29163/com.example.myapp D/zyr﹕ A DIS ACTION_MOVE03-18 15:40:18.111  29163-29163/com.example.myapp D/zyr﹕ A INT ACTION_MOVE03-18 15:40:18.111  29163-29163/com.example.myapp E/zyr﹕ B DIS ACTION_MOVE03-18 15:40:18.111  29163-29163/com.example.myapp E/zyr﹕ B TOU ACTION_MOVE03-18 15:40:18.126  29163-29163/com.example.myapp D/zyr﹕ A DIS ACTION_MOVE03-18 15:40:18.126  29163-29163/com.example.myapp D/zyr﹕ A INT ACTION_MOVE03-18 15:40:18.126  29163-29163/com.example.myapp E/zyr﹕ B DIS ACTION_MOVE03-18 15:40:18.126  29163-29163/com.example.myapp E/zyr﹕ B TOU ACTION_MOVE03-18 15:40:18.131  29163-29163/com.example.myapp D/zyr﹕ A DIS ACTION_UP03-18 15:40:18.131  29163-29163/com.example.myapp D/zyr﹕ A INT ACTION_UP03-18 15:40:18.131  29163-29163/com.example.myapp E/zyr﹕ B DIS ACTION_UP03-18 15:40:18.131  29163-29163/com.example.myapp E/zyr﹕ B TOU ACTION_UP

结论

虽然MyLinearLayout的onTouch返回true,但是MyTouch也是返回true,由于安卓触摸事件传递是由上而下,但是消费触摸事件是由下而上的,所以处于下面的MyView消费掉了触摸事件,MyLinearLayout无法消费

情况四,

研究onInterceptTouchEvent

MyLinearLayout,　　　　dispatchTouchEvent返回false　　　　onInterceptTouchEvent返回true　　　　onTouchEvent返回falseMyView　　　　dispatchTouchEvent返回false　　　　　　onTouchEvent返回true

结果

03-18 15:44:37.701  20477-20477/com.example.myapp D/zyr﹕ A DIS ACTION_DOWN03-18 15:44:37.701  20477-20477/com.example.myapp D/zyr﹕ A INT ACTION_DOWN03-18 15:44:37.701  20477-20477/com.example.myapp D/zyr﹕ A TOU ACTION_DOWN

结论

 

虽然MyView的onTouch返回true,但是被MyLinearLayout拦截下来了(MyLinearLayout的onInterceptTouchEvent返回true),但是MyLinearLayout的onTouch返回false,即它并没有消费此次触摸事件,so,,,此次触摸事件就此结束,当然Action_Move是没有机会传递拉.

情况五,

MyLinearLayout,　　　　dispatchTouchEvent返回false　　　　onInterceptTouchEvent                       ACTION_DOWN,false                       ACTION_MOVE,true                       ACTION_UP,false　　　　onTouchEvent                       ACTION_DOWN,false                       ACTION_MOVE,true                       ACTION_UP,falseMyView　　　　dispatchTouchEvent返回false　　　　　　onTouchEvent返回true    

结果

03-18 16:09:36.241    8257-8257/com.example.myapp D/zyr﹕ A DIS ACTION_DOWN03-18 16:09:36.241    8257-8257/com.example.myapp D/zyr﹕ A INT ACTION_DOWN03-18 16:09:36.241    8257-8257/com.example.myapp E/zyr﹕ B DIS ACTION_DOWN03-18 16:09:36.241    8257-8257/com.example.myapp E/zyr﹕ B TOU ACTION_DOWN03-18 16:09:36.271    8257-8257/com.example.myapp D/zyr﹕ A DIS ACTION_MOVE03-18 16:09:36.271    8257-8257/com.example.myapp D/zyr﹕ A INT ACTION_MOVE03-18 16:09:36.296    8257-8257/com.example.myapp D/zyr﹕ A DIS ACTION_MOVE03-18 16:09:36.296    8257-8257/com.example.myapp D/zyr﹕ A TOU ACTION_MOVE03-18 16:09:36.296    8257-8257/com.example.myapp D/zyr﹕ A DIS ACTION_UP03-18 16:09:36.296    8257-8257/com.example.myapp D/zyr﹕ A TOU ACTION_UP

结论

MyLinearLayout,　　　　dispatchTouchEvent返回false　　　　onInterceptTouchEvent                       ACTION_DOWN,false                       ACTION_MOVE,false                       ACTION_UP,false　　　　onTouchEvent                       ACTION_DOWN,true                       ACTION_MOVE,true                       ACTION_UP,trueMyView　　　　dispatchTouchEvent返回false　　　　　　onTouchEvent返回true    

03-28 16:00:01.036      628-628/com.example.myapp D/zyr﹕ A DIS ACTION_DOWN03-28 16:00:01.036      628-628/com.example.myapp D/zyr﹕ A INT ACTION_DOWN03-28 16:00:01.036      628-628/com.example.myapp D/zyrr﹕ isInRange:true03-28 16:00:01.036      628-628/com.example.myapp E/zyr﹕ B DIS ACTION_DOWN03-28 16:00:01.036      628-628/com.example.myapp E/zyr﹕ B TOU ACTION_DOWN03-28 16:00:01.046      628-628/com.example.myapp D/zyr﹕ A DIS ACTION_UP03-28 16:00:01.046      628-628/com.example.myapp D/zyr﹕ A INT ACTION_UP03-28 16:00:01.051      628-628/com.example.myapp E/zyr﹕ B DIS ACTION_UP03-28 16:00:01.051      628-628/com.example.myapp E/zyr﹕ B TOU ACTION_UP