android触摸事件分发机制

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文章标签：

#android #onTouchEvent #onInterceptTouchEven #dispatchTouchEvent #分发机制

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本文详细解析了Android系统的触控事件处理流程，包括dispatchTouchEvent、onInterceptTouchEvent及onTouchEvent等关键方法的作用机制，并通过具体示例展示了事件传递的过程。

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一直对android的分发机制不是非常清楚，这次自己测试一下

先把测试结果贴上来：

默认的传递是这样的：

activity dispatchTouchEvent --> viewgroup dispatchTouchEvent --> viewgroup onInterceptTouchEvent --> view dispatchTouchEvent --> view onTouchEvent

--> viewgroup onTouchEvent --> activity onTouchEvent

可以这样理解：dispatchTouchEvent 事件分发是负责自己和父容器的分发,如果返回为true 交给自己的onInterceptTouchEvent （view没有onInterceptTouchEvent 直接交给onTouchEvent），如果返回为false，则把事件交给父容器的onTouchEvent

onInterceptTouchEvent 事件拦截是负责自己和子View的分发,如果返回为true 交给自己的onTouchEvent 如果为false,交给子view的dispatchTouchEvent

需要注意的是，如果ACTION_DOWN被某view或者activity或者viewgroup消费，其后的一系类触摸事件都会传递到这个消费者中

继续改

viewgroup onInterceptTouchEvent 的ACTION_DOWN事件返回false,此时DOWN事件会交给子view的dispatchTouchEvent，然后子view的dispatchTouchEvent的DOWN事件返回true，子view的dispatchTouchEvent的MOVE事件返回false,我们知道，事件如果被View消费了，则不会继续往上传递，但是viewgroup的ontouchEvent却不能能接受的DOWN事件。可见事件的传递是一整套的，例如如果某个消费体消费了MOVE事件，则必定会消费DOWN事件，如果消费了DOWN事件，则必然会消费MOVE事件。

activity中:

@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
    LogUtil.i("activity dispatchTouchEvent");
    switch (ev.getAction()){
        case MotionEvent.ACTION_DOWN:
            LogUtil.i("activity dispatchTouchEvent ACTION_DOWN");
            break;
        case MotionEvent.ACTION_MOVE:
            LogUtil.i("activity dispatchTouchEvent ACTION_MOVE");
            break;
        case MotionEvent.ACTION_CANCEL:
        case MotionEvent.ACTION_UP:
            LogUtil.i("activity dispatchTouchEvent ACTION_UP");
            break;
    }
    return super.dispatchTouchEvent(ev);
}

@Override
public boolean onTouchEvent(MotionEvent event) {
    LogUtil.i("activity onTouchEvent");
    switch (event.getAction()){
        case MotionEvent.ACTION_DOWN:
            LogUtil.i("activity onTouchEvent ACTION_DOWN");
            break;
        case MotionEvent.ACTION_MOVE:
            LogUtil.i("activity onTouchEvent ACTION_MOVE");
            break;
        case MotionEvent.ACTION_CANCEL:
        case MotionEvent.ACTION_UP:
            LogUtil.i("activity onTouchEvent ACTION_UP");
            break;
    }
    return super.onTouchEvent(event);
}

relativelatyout中:

@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
    LogUtil.i("ralativelayout dispatchTouchEvent");
    switch (ev.getAction()){
        case MotionEvent.ACTION_DOWN:
            LogUtil.i("ralativelayout dispatchTouchEvent ACTION_DOWN");
            break;
        case MotionEvent.ACTION_MOVE:
            LogUtil.i("ralativelayout dispatchTouchEvent ACTION_MOVE");
            break;
        case MotionEvent.ACTION_CANCEL:
        case MotionEvent.ACTION_UP:
            LogUtil.i("ralativelayout dispatchTouchEvent ACTION_UP");
            break;
    }
    return super.dispatchTouchEvent(ev);
}

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
    LogUtil.i("ralativelayout onInterceptTouchEvent");
    switch (ev.getAction()){
        case MotionEvent.ACTION_DOWN:
            LogUtil.i("ralativelayout onInterceptTouchEvent ACTION_DOWN");
            break;
        case MotionEvent.ACTION_MOVE:
            LogUtil.i("ralativelayout onInterceptTouchEvent ACTION_MOVE");
            break;
        case MotionEvent.ACTION_CANCEL:
        case MotionEvent.ACTION_UP:
            LogUtil.i("ralativelayout onInterceptTouchEvent ACTION_UP");
            break;
    }
    return super.onInterceptTouchEvent(ev);
}

@Override
public boolean onTouchEvent(MotionEvent event) {
    LogUtil.i("ralativelayout onTouchEvent");
    switch (event.getAction()){
        case MotionEvent.ACTION_DOWN:
            LogUtil.i("ralativelayout onTouchEvent ACTION_DOWN");
            break;
        case MotionEvent.ACTION_MOVE:
            LogUtil.i("ralativelayout onTouchEvent ACTION_MOVE");
            break;
        case MotionEvent.ACTION_CANCEL:
        case MotionEvent.ACTION_UP:
            LogUtil.i("ralativelayout onTouchEvent ACTION_UP");
            break;
    }
    return super.onTouchEvent(event);
}

view中:

@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
    LogUtil.i("view dispatchTouchEvent");
    switch (ev.getAction()){
        case MotionEvent.ACTION_DOWN:
            LogUtil.i("view dispatchTouchEvent ACTION_DOWN");
            break;
        case MotionEvent.ACTION_MOVE:
            LogUtil.i("view dispatchTouchEvent ACTION_MOVE");
            break;
        case MotionEvent.ACTION_CANCEL:
        case MotionEvent.ACTION_UP:
            LogUtil.i("view dispatchTouchEvent ACTION_UP");
            break;
    }
    return super.dispatchTouchEvent(ev);
}


@Override
public boolean onTouchEvent(MotionEvent event) {
    LogUtil.i("view onTouchEvent");
    switch (event.getAction()){
        case MotionEvent.ACTION_DOWN:
            LogUtil.i("view onTouchEvent ACTION_DOWN");
            break;
        case MotionEvent.ACTION_MOVE:
            LogUtil.i("view onTouchEvent ACTION_MOVE");
            break;
        case MotionEvent.ACTION_CANCEL:
        case MotionEvent.ACTION_UP:
            LogUtil.i("view onTouchEvent ACTION_UP");
            break;
    }
    return super.onTouchEvent(event);
}

打印出来的日志：

03-23 17:16:17.855 18515-18515/com.fy.administrator.listviewtest I/com.fy.administrator.listviewtest.LogUtil: activity dispatchTouchEvent
03-23 17:16:17.855 18515-18515/com.fy.administrator.listviewtest I/com.fy.administrator.listviewtest.LogUtil: activity dispatchTouchEvent ACTION_DOWN
03-23 17:16:17.865 18515-18515/com.fy.administrator.listviewtest I/com.fy.administrator.listviewtest.LogUtil: ralativelayout dispatchTouchEvent
03-23 17:16:17.865 18515-18515/com.fy.administrator.listviewtest I/com.fy.administrator.listviewtest.LogUtil: ralativelayout dispatchTouchEvent ACTION_DOWN
03-23 17:16:17.875 18515-18515/com.fy.administrator.listviewtest I/com.fy.administrator.listviewtest.LogUtil: ralativelayout onInterceptTouchEvent
03-23 17:16:17.875 18515-18515/com.fy.administrator.listviewtest I/com.fy.administrator.listviewtest.LogUtil: ralativelayout onInterceptTouchEvent ACTION_DOWN
03-23 17:16:17.875 18515-18515/com.fy.administrator.listviewtest I/com.fy.administrator.listviewtest.LogUtil: view dispatchTouchEvent
03-23 17:16:17.875 18515-18515/com.fy.administrator.listviewtest I/com.fy.administrator.listviewtest.LogUtil: view dispatchTouchEvent ACTION_DOWN
03-23 17:16:17.875 18515-18515/com.fy.administrator.listviewtest I/com.fy.administrator.listviewtest.LogUtil: view onTouchEvent
03-23 17:16:17.875 18515-18515/com.fy.administrator.listviewtest I/com.fy.administrator.listviewtest.LogUtil: view onTouchEvent ACTION_DOWN
03-23 17:16:17.875 18515-18515/com.fy.administrator.listviewtest I/com.fy.administrator.listviewtest.LogUtil: ralativelayout onTouchEvent
03-23 17:16:17.885 18515-18515/com.fy.administrator.listviewtest I/com.fy.administrator.listviewtest.LogUtil: ralativelayout onTouchEvent ACTION_DOWN
03-23 17:16:17.885 18515-18515/com.fy.administrator.listviewtest I/com.fy.administrator.listviewtest.LogUtil: activity onTouchEvent
03-23 17:16:17.885 18515-18515/com.fy.administrator.listviewtest I/com.fy.administrator.listviewtest.LogUtil: activity onTouchEvent ACTION_DOWN
03-23 17:16:17.885 18515-18515/com.fy.administrator.listviewtest I/com.fy.administrator.listviewtest.LogUtil: activity dispatchTouchEvent
03-23 17:16:17.885 18515-18515/com.fy.administrator.listviewtest I/com.fy.administrator.listviewtest.LogUtil: activity dispatchTouchEvent ACTION_MOVE
03-23 17:16:17.885 18515-18515/com.fy.administrator.listviewtest I/com.fy.administrator.listviewtest.LogUtil: activity onTouchEvent
03-23 17:16:17.895 18515-18515/com.fy.administrator.listviewtest I/com.fy.administrator.listviewtest.LogUtil: activity onTouchEvent ACTION_MOVE
03-23 17:16:17.895 18515-18515/com.fy.administrator.listviewtest I/com.fy.administrator.listviewtest.LogUtil: activity dispatchTouchEvent
03-23 17:16:17.895 18515-18515/com.fy.administrator.listviewtest I/com.fy.administrator.listviewtest.LogUtil: activity dispatchTouchEvent ACTION_UP
03-23 17:16:17.895 18515-18515/com.fy.administrator.listviewtest I/com.fy.administrator.listviewtest.LogUtil: activity onTouchEvent
03-23 17:16:17.905 18515-18515/com.fy.administrator.listviewtest I/com.fy.administrator.listviewtest.LogUtil: activity onTouchEvent ACTION_UP