这几天一直在研究onTouch的相关方法，今天我们就来看看onTouchEvent、dispatchTouchEvent、onIntercepTouchEvent这三个方法在控件之间的传递顺序

public boolean dispatchTouchEvent(MotionEvent ev)      //用于事件的分发

public boolean onInterceptTouchEvent(MotionEvent ev)    //  用于事件的拦截

public boolean onTouchEvent(MotionEvent ev)     //处理事件

先看如下代码

1）xml文件

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context="com.example.mygestrue.MainActivity" >

    <com.example.mygestrue.MyLinearLayout

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:orientation="vertical" >

        <com.example.mygestrue.MyLinearLayoutT

            android:layout_width="match_parent"

            android:layout_height="match_parent"

            android:orientation="vertical" >

            <com.example.mygestrue.MyTextView

                android:id="@+id/tv1"

                android:layout_width="50dp"

                android:layout_height="50dp"

                android:background="#0000ff"

                android:text="@string/hello_world" />

            <com.example.mygestrue.MyTextViewT

                android:layout_marginTop="50dp"

                android:layout_width="50dp"

                android:layout_height="50dp"

                android:background="#ff0000"

                android:text="@string/hello_world" />

        </com.example.mygestrue.MyLinearLayoutT>

    </com.example.mygestrue.MyLinearLayout>

</RelativeLayout>

2）上面用到的几个自定义的类

MyLinearLayout

package com.example.mygestrue;

import android.content.Context;

import android.util.AttributeSet;

import android.util.Log;

import android.view.MotionEvent;

import android.widget.LinearLayout;

public class MyLinearLayout extends LinearLayout {

    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 onTouchEvent(MotionEvent event) {

    // TODO Auto-generated method stub

    Log.e("123", "myll1_ontouchevent");

    return super.onTouchEvent(event);

}

@Override

public boolean dispatchTouchEvent(MotionEvent ev) {

    // TODO Auto-generated method stub

    Log.e("123", "myll1_dispatchTouchevent");

    return super.dispatchTouchEvent(ev);

}

@Override

public boolean onInterceptTouchEvent(MotionEvent ev) {

    // TODO Auto-generated method stub

    Log.e("123", "myll1_oninterceptouchevent");

    return super.onInterceptTouchEvent(ev);

}

}

MyLinearLayoutT

package com.example.mygestrue;

import android.content.Context;

import android.util.AttributeSet;

import android.util.Log;

import android.view.MotionEvent;

import android.widget.LinearLayout;

public class MyLinearLayoutT extends LinearLayout {

    public MyLinearLayoutT(Context context, AttributeSet attrs, int defStyle) {

        super(context, attrs, defStyle);

        // TODO Auto-generated constructor stub

    }

    public MyLinearLayoutT(Context context, AttributeSet attrs) {

        super(context, attrs);

        // TODO Auto-generated constructor stub

    }

    public MyLinearLayoutT(Context context) {

        super(context);

        // TODO Auto-generated constructor stub

    }

@Override

public boolean onTouchEvent(MotionEvent event) {

    // TODO Auto-generated method stub

    Log.e("123", "myll2_ontouchevent");

    return super.onTouchEvent(event);

}

@Override

public boolean dispatchTouchEvent(MotionEvent ev) {

    // TODO Auto-generated method stub

    Log.e("123", "myll2_dispatchTouchevent");

    return super.dispatchTouchEvent(ev);

}

@Override

public boolean onInterceptTouchEvent(MotionEvent ev) {

    // TODO Auto-generated method stub

    Log.e("123", "myll2_oninterceptouchevent");

    return super.onInterceptTouchEvent(ev);

}

}

MyTextView

package com.example.mygestrue;

import android.content.Context;

import android.util.AttributeSet;

import android.util.Log;

import android.view.MotionEvent;

import android.widget.TextView;

public class MyTextView extends TextView {

    public MyTextView(Context context, AttributeSet attrs, int defStyle) {

        super(context, attrs, defStyle);

        // TODO Auto-generated constructor stub

    }

    public MyTextView(Context context, AttributeSet attrs) {

        super(context, attrs);

        // TODO Auto-generated constructor stub

    }

    public MyTextView(Context context) {

        super(context);

        // TODO Auto-generated constructor stub

    }

@Override

public boolean onTouchEvent(MotionEvent event) {

    // TODO Auto-generated method stub

    Log.e("123", "mytv1_ontouchevent");

    return super.onTouchEvent(event);

}

@Override

public boolean dispatchTouchEvent(MotionEvent event) {

    // TODO Auto-generated method stub

    Log.e("123", "mytv1_dispatchtouchevent");

    return super.dispatchTouchEvent(event);

}

}

MyTextViewT

package com.example.mygestrue;

import android.content.Context;

import android.util.AttributeSet;

import android.util.Log;

import android.view.MotionEvent;

import android.widget.TextView;

public class MyTextViewT extends TextView {

    public MyTextViewT(Context context, AttributeSet attrs, int defStyle) {

        super(context, attrs, defStyle);

        // TODO Auto-generated constructor stub

    }

    public MyTextViewT(Context context, AttributeSet attrs) {

        super(context, attrs);

        // TODO Auto-generated constructor stub

    }

    public MyTextViewT(Context context) {

        super(context);

        // TODO Auto-generated constructor stub

    }

@Override

public boolean onTouchEvent(MotionEvent event) {

    // TODO Auto-generated method stub

    Log.e("123", "mytv2_ontouchevent");

    return super.onTouchEvent(event);

}

@Override

public boolean dispatchTouchEvent(MotionEvent event) {

    // TODO Auto-generated method stub

    Log.e("123", "mytv2_dispatchtouchevent");

    return super.dispatchTouchEvent(event);

}

}

MainActivity

package com.example.mygestrue;

import android.support.v7.app.ActionBarActivity;

import android.os.Bundle;

import android.util.Log;

import android.view.Menu;

import android.view.MenuItem;

import android.view.MotionEvent;

public class MainActivity extends ActionBarActivity {

;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

    }

    @Override

    public boolean dispatchTouchEvent(MotionEvent ev) {

        // TODO Auto-generated method stub

    Log.e("123", "main_dispatchtouchevent");

        return super.dispatchTouchEvent(ev);

    }

    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

        return true;

    }

    @Override

    public boolean onOptionsItemSelected(MenuItem item) {

        // Handle action bar item clicks here. The action bar will

        // automatically handle clicks on the Home/Up button, so long

        // as you specify a parent activity in AndroidManifest.xml.

        return super.onOptionsItemSelected(item);

    }

    @Override

    public boolean onTouchEvent(MotionEvent event) {

        // TODO Auto-generated method stub

        Log.e("123", "main_ontouchevent");

        // return super.onTouchEvent(event);

        return super.onTouchEvent(event);

    };

}

1.当我们点击屏幕空白处的时候，打印的log

- ::16.879: E/(): main_dispatchtouchevent

- ::16.879: E/(): myll1_dispatchTouchevent

- ::16.879: E/(): myll1_oninterceptouchevent

- ::16.879: E/(): myll2_dispatchTouchevent

- ::16.879: E/(): myll2_oninterceptouchevent

- ::16.880: E/(): myll2_ontouchevent

- ::16.881: E/(): myll1_ontouchevent

- ::16.882: E/(): main_ontouchevent

- ::17.748: E/(): main_dispatchtouchevent

- ::17.748: E/(): myll1_dispatchTouchevent

- ::17.748: E/(): myll1_oninterceptouchevent

- ::17.749: E/(): myll2_dispatchTouchevent

- ::17.749: E/(): myll2_oninterceptouchevent

- ::17.749: E/(): myll2_ontouchevent

- ::17.749: E/(): myll1_ontouchevent

- ::17.751: E/(): main_ontouchevent

得出的结论是

首先是Activity_dispatchTouchEvent->xml最外层容器_dispatchTouchEvent->xml最外层容器_onIntercepTouchEvent->下一层_dispatchTouchEvent->下一层_onIntercepTouchEvent->最末层_onTouchEvent->上一层_onTouchEvent->最外层_onTouchEvent->Activity_onTouchEvent

现在我们更改一下这些touch事件的返回值，如下

activity:

 dispatchTouchEvent:true

 onTouchEvent :true

linear1:

 dispatchTouchEvent:true

 onTouchEvent :true

 onInterceptTouchEvent:true

linear2:

 dispatchTouchEvent:true

 onTouchEvent :true

 onInterceptTouchEvent:true

tv1:

 dispatchTouchEvent:true

 onTouchEvent :true

tv2:

 dispatchTouchEvent:true

 onTouchEvent :true

打印的log如下

- ::32.237: E/(): main_dispatchtouchevent

- ::32.267: E/(): main_dispatchtouchevent

- ::32.283: E/(): main_dispatchtouchevent

- ::32.300: E/(): main_dispatchtouchevent

- ::32.317: E/(): main_dispatchtouchevent

- ::32.335: E/(): main_dispatchtouchevent

- ::32.341: E/(): main_dispatchtouchevent

- ::32.914: E/(): main_dispatchtouchevent

- ::32.933: E/(): main_dispatchtouchevent

- ::32.951: E/(): main_dispatchtouchevent

- ::32.968: E/(): main_dispatchtouchevent

- ::32.985: E/(): main_dispatchtouchevent

- ::33.002: E/(): main_dispatchtouchevent

- ::33.006: E/(): main_dispatchtouchevent

只有main_dispatchtouchevent执行了

activity:

 dispatchTouchEvent:false

 onTouchEvent :true

linear1:

 dispatchTouchEvent:true

 onTouchEvent :true

 onInterceptTouchEvent:true

linear2:

 dispatchTouchEvent:true

 onTouchEvent :true

 onInterceptTouchEvent:true

tv1:

 dispatchTouchEvent:true

 onTouchEvent :true

tv2:

 dispatchTouchEvent:true

 onTouchEvent :true

打印log

- ::45.660: E/(): main_dispatchtouchevent

- ::45.688: E/(): main_dispatchtouchevent

- ::45.706: E/(): main_dispatchtouchevent

- ::45.723: E/(): main_dispatchtouchevent

- ::45.740: E/(): main_dispatchtouchevent

- ::45.748: E/(): main_dispatchtouchevent

还是仅仅执行了main_dispatchtouchevent

activity:

 dispatchTouchEvent:false

 onTouchEvent :false

linear1:

 dispatchTouchEvent:true

 onTouchEvent :true

 onInterceptTouchEvent:true

linear2:

 dispatchTouchEvent:true

 onTouchEvent :true

 onInterceptTouchEvent:true

tv1:

 dispatchTouchEvent:true

 onTouchEvent :true

tv2:

 dispatchTouchEvent:true

 onTouchEvent :true

打印log

- ::26.545: E/(): main_dispatchtouchevent

- ::26.563: E/(): main_dispatchtouchevent

- ::26.580: E/(): main_dispatchtouchevent

- ::26.598: E/(): main_dispatchtouchevent

- ::26.615: E/(): main_dispatchtouchevent

- ::26.632: E/(): main_dispatchtouchevent

- ::26.649: E/(): main_dispatchtouchevent

- ::26.650: E/(): main_dispatchtouchevent

结果还是一样：执行的是main_dispatchtouchevent

activity:

 dispatchTouchEvent:false

 onTouchEvent :false

linear1:

 dispatchTouchEvent:false

 onTouchEvent :true

 onInterceptTouchEvent:true

linear2:

 dispatchTouchEvent:true

 onTouchEvent :true

 onInterceptTouchEvent:true

tv1:

 dispatchTouchEvent:true

 onTouchEvent :true

tv2:

 dispatchTouchEvent:true

 onTouchEvent :true

打印log

- ::04.697: E/(): main_dispatchtouchevent

- ::04.722: E/(): main_dispatchtouchevent

- ::04.739: E/(): main_dispatchtouchevent

- ::04.757: E/(): main_dispatchtouchevent

- ::04.774: E/(): main_dispatchtouchevent

- ::04.792: E/(): main_dispatchtouchevent

- ::04.796: E/(): main_dispatchtouchevent

结果仍然没有改变 main_dispatchtouchevent被执行

activity:

 dispatchTouchEvent:false

 onTouchEvent :false

linear1:

 dispatchTouchEvent:false

 onTouchEvent :true

 onInterceptTouchEvent:false

linear2:

 dispatchTouchEvent:true

 onTouchEvent :true

 onInterceptTouchEvent:true

tv1:

 dispatchTouchEvent:true

 onTouchEvent :true

tv2:

 dispatchTouchEvent:true

 onTouchEvent :true
- ::23.294: E/(): main_dispatchtouchevent

- ::23.318: E/(): main_dispatchtouchevent

- ::23.336: E/(): main_dispatchtouchevent

- ::23.353: E/(): main_dispatchtouchevent

- ::23.370: E/(): main_dispatchtouchevent

- ::23.387: E/(): main_dispatchtouchevent

- ::23.390: E/(): main_dispatchtouchevent

好吧，忽然感觉，这个时候，仅仅让activity中的ontouch事件纯粹返回true或者false是没有意义的，这样事件好像根本就没办法往下传了

activity:

 dispatchTouchEvent:super.dispatchTouchEvent(ev)

 onTouchEvent :false

linear1:

 dispatchTouchEvent:true

 onTouchEvent :true

 onInterceptTouchEvent:true

linear2:

 dispatchTouchEvent:true

 onTouchEvent :true

 onInterceptTouchEvent:true

tv1:

 dispatchTouchEvent:true

 onTouchEvent :true

tv2:

 dispatchTouchEvent:true

 onTouchEvent :true
- ::18.871: E/(): main_dispatchtouchevent

- ::18.872: E/(): myll1_dispatchTouchevent

- ::18.896: E/(): main_dispatchtouchevent

- ::18.897: E/(): myll1_dispatchTouchevent

- ::18.912: E/(): main_dispatchtouchevent

- ::18.913: E/(): myll1_dispatchTouchevent

- ::18.929: E/(): main_dispatchtouchevent

- ::18.929: E/(): myll1_dispatchTouchevent

- ::18.947: E/(): main_dispatchtouchevent

- ::18.948: E/(): myll1_dispatchTouchevent

- ::18.964: E/(): main_dispatchtouchevent

- ::18.964: E/(): myll1_dispatchTouchevent

- ::18.978: E/(): main_dispatchtouchevent

- ::18.978: E/(): myll1_dispatchTouchevent

- ::18.979: E/(): main_dispatchtouchevent

- ::18.979: E/(): myll1_dispatchTouchevent

我们看到，这时候，ll1接收到了main_dispatchtouchevent传过来的事件，但是，它并没有继续往下传

activity:

 dispatchTouchEvent:super.dispatchTouchEvent(ev)

 onTouchEvent :false

linear1:

 dispatchTouchEvent:false

 onTouchEvent :true

 onInterceptTouchEvent:true

linear2:

 dispatchTouchEvent:true

 onTouchEvent :true

 onInterceptTouchEvent:true

tv1:

 dispatchTouchEvent:true

 onTouchEvent :true

tv2:

 dispatchTouchEvent:true

 onTouchEvent :true
- ::58.037: E/(): main_dispatchtouchevent

- ::58.037: E/(): myll1_dispatchTouchevent

- ::58.039: E/(): main_ontouchevent

- ::58.056: E/(): main_dispatchtouchevent

- ::58.056: E/(): main_ontouchevent

- ::58.073: E/(): main_dispatchtouchevent

- ::58.073: E/(): main_ontouchevent

- ::58.090: E/(): main_dispatchtouchevent

- ::58.090: E/(): main_ontouchevent

- ::58.108: E/(): main_dispatchtouchevent

- ::58.108: E/(): main_ontouchevent

- ::58.122: E/(): main_dispatchtouchevent

- ::58.122: E/(): main_ontouchevent

- ::58.122: E/(): main_dispatchtouchevent

- ::58.123: E/(): main_ontouchevent

我们看到ll1接收到了main_dispatchtouchevent的事件，但是，这时候，ll1的dispatchtouchevent的返回值为false,就是说，这个事件不往下分发，而ll1的interceptouchevent返回值又为true,也就是说，事件拦截，所以它的ontouch就不执行了，这样，就直接执行到了main_touchevent了

activity:

 dispatchTouchEvent:super.dispatchTouchEvent(ev)

 onTouchEvent :false

linear1:

 dispatchTouchEvent:true

 onTouchEvent :true

 onInterceptTouchEvent:false

linear2:

 dispatchTouchEvent:false

 onTouchEvent :true

 onInterceptTouchEvent:false

tv1:

 dispatchTouchEvent:true

 onTouchEvent :true

tv2:

 dispatchTouchEvent:true

 onTouchEvent :true

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