##1、事件理解：
1> dispatchTouchEvent() : 处理事件分发return true,表示事件被分发；
2> onInterceptTouchEvent() ：事件拦截（改变事件的传递方向），return false表示传递给子控件的onTouchEvent(),return true表示传递给当前控件的onTouchEvent();
3> onTouchEvent()：return true表示事件被消费；进一步理解就是ACTION_DOWN事件被消费，只有ACTION_DOWN事件被消费了，我们再能捕获到ACTION_UP，ACTION_MOVE等。。。

---

##2、Activity、GroupView、VIew中回调函数
1>Activity：

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        return super.onTouchEvent(event);
    }
    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        return super.dispatchTouchEvent(ev);
    }

2>GroupView:

    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        return super.dispatchTouchEvent(ev);
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        return super.onInterceptTouchEvent(ev);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        return super.onTouchEvent(event);
    }

3>View:

    @Override
    public boolean dispatchTouchEvent(MotionEvent event) {
        return super.dispatchTouchEvent(event);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        return false;
    }

---

##3、代码事例
我们先通过代码演示一下Android中dispatchTouchEvent()、onInterceptTouchEvent()和onTouchEvent()的调用过程；
1>自定义LinearLayout : MyLinearLayout

public class MyLinearLayout extends LinearLayout {

    public static final String Tag = "zhangjunling";
    public MyLinearLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        // TODO Auto-generated constructor stub
    }

    public MyLinearLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        // TODO Auto-generated constructor stub
    }

    public MyLinearLayout(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        // TODO Auto-generated method stub
        Log.v(Tag, "MyLinearLayout:dispatchTouchEvent");
        return super.dispatchTouchEvent(ev);
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        // TODO Auto-generated method stub
        Log.v(Tag, "MyLinearLayout:onInterceptTouchEvent");
        return super.onInterceptTouchEvent(ev);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        // TODO Auto-generated method stub
        Log.v(Tag, "MyLinearLayout:onTouchEvent");
        return super.onTouchEvent(event);
    }

}

2>自定义View : MyView

public class MyView extends Button {

    public MyView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        // TODO Auto-generated constructor stub
    }

    public MyView(Context context, AttributeSet attrs) {
        super(context, attrs);
        // TODO Auto-generated constructor stub
    }

    public MyView(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent event) {
        // TODO Auto-generated method stub
        Log.v(MyLinearLayout.Tag, "MyView:dispatchTouchEvent");
        return super.dispatchTouchEvent(event);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        // TODO Auto-generated method stub
        Log.v(MyLinearLayout.Tag, "MyView:onTouchEvent");
        return false;
    }
}

3>重写Activity的dispatchTouchEvent()、onTouchEvent()

@Override
    public boolean onTouchEvent(MotionEvent event) {
        // TODO Auto-generated method stub
        Log.v(MyLinearLayout.Tag, "MainActivity:onTouchEvent");
        return super.onTouchEvent(event);
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        // TODO Auto-generated method stub
        Log.v(MyLinearLayout.Tag, "MainActivity:dispatchTouchEvent");
        return super.dispatchTouchEvent(ev);
    }

4、MyVeiw.setOnTouchListener()

myView.setOnTouchListener(new OnTouchListener() {

            @Override
            public boolean onTouch(View v, MotionEvent event) {
                Log.v(MyLinearLayout.Tag, "OnTouchListener:onTouch");
                return false;
            }
        });

5、布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    >
    <com.example.androidontouch.MyLinearLayout 
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        >
          <com.example.androidontouch.MyView
               android:layout_width="match_parent"
               android:layout_height="200dp"
               android:clickable="true"
               android:id="@+id/myview"
        />
    </com.example.androidontouch.MyLinearLayout>
</LinearLayout>

6、结果：

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##结果：
Android中默认情况下事件传递是由最终的view的接收到，传递过程是从父布局到子布局，也就是从Activity到ViewGroup到View的过程

---

Android中事件传递过程（按箭头方向）如下图,图片来自qiushuiqifei，谢谢整理。

View.setOnTouchListener()、View.onTouchEvent()、View.setOnClickListener()它们三者也存在调用关系，后面我会通过源码进行分析讲解；

下面的几张图参考自eoe：