在Android中当一个ViewGroup 中包含一个组件，当点击这个组件同时监听其onTouch事件，那么到底是父组件响应还是子组件响应呢？傻蛋在网上找到了一篇相关的帖子，照着例子测试了一番，发现网上的那篇有点问题，先把测试结果总结如下.
在触发OnTouch事件的时候Android的GroupView会调用如下三个函数：
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
当然我们可以在容器类中如继承自LinearLayout的类中重写这三个方法。而继承View类的子类只能重写dispatch和onTouchEvent两个方法。当点击后这三个方法相继执行。
自己写了一个TextView子类MyTextView和LinearLayout子类MyLinearLayout，TextView包含在LinearLayout中。
当点击MyTextView时，程序会先进入到LinearLayout的dispatchTouchEvent中，这个类必须调用super.dispatchTouchEvent(ev); 否在后面的两个方法无法触发，所以傻蛋发现这个方法根本没有必要重写，因为框架是在super.dispatchTouchEvent(ev);中来调用onInterceptTouchEvent和onTouchEvent方法的，所以手动的设置dispatchTouchEvent的返回值是无效的，除非你不想让框架触发这两个方法。
当执行完dispathTouchEvent后会执行onInterception方法，如果返回为true，这表示MyLinearLayout把这个Touch事件拦截了，就会执行自己的Ontouch方法。如果为false则表示不拦截，此事件会分发到把事件传递给它的子控件MyTextView中。
当事件传递到MyTextView后，会执行dispatchTouchEvent，然后会执行onTouchEvent。挡在MyTextView中的onTouchEvent返回为false的话，当执行完onTouchEvent中的事件后，事件会再分发给MyLinearLaytout,执行LinearLayout的onTouchEvent。
主要代码如下
- /**
- * MyLinearLayout.java
- * com.androidtest.touch.test
- *
- * Function： TODO
- *
- * ver date author
- * ──────────────────────────────────
- * 2011-5-24 Leon
- *
- * Copyright (c) 2011, TNT All Rights Reserved.
- */
- package com.androidtest.touch.test;
- import android.content.Context;
- import android.util.AttributeSet;
- import android.util.Log;
- import android.view.MotionEvent;
- import android.widget.LinearLayout;
- /**
- * ClassName:MyLinearLayout Function: TODO ADD FUNCTION Reason: TODO ADD REASON
- *
- * @author Leon
- * @version
- * @since Ver 1.1
- * @Date 2011-5-24
- */
- public class MyLinearLayout extends LinearLayout {
- private final static String TAG = MyLinearLayout.class.getSimpleName();
- public MyLinearLayout(Context context, AttributeSet attrs) {
- super(context, attrs);
- // TODO Auto-generated constructor stub
- Log.v(TAG , TAG);
- }
- @Override
- public boolean dispatchTouchEvent(MotionEvent ev) {
- int action = ev.getAction();
- switch (action) {
- case MotionEvent.ACTION_DOWN:
- Log.d(TAG, "dispatchTouchEvent action:ACTION_DOWN");
- break;
- case MotionEvent.ACTION_MOVE:
- Log.d(TAG, "dispatchTouchEvent action:ACTION_MOVE");
- break;
- case MotionEvent.ACTION_UP:
- Log.d(TAG, "dispatchTouchEvent action:ACTION_UP");
- break;
- case MotionEvent.ACTION_CANCEL:
- Log.d(TAG, "dispatchTouchEvent action:ACTION_CANCEL");
- break;
- }
- // Log.v(TAG , "dispatchTouchEvent "+super.dispatchTouchEvent(ev));
- super.dispatchTouchEvent(ev);
- Log.v(TAG , "dispatchTouchEvent "+ "test.................");
- return true;
- }
- @Override
- public boolean onInterceptTouchEvent(MotionEvent ev) {
- int action = ev.getAction();
- switch (action) {
- case MotionEvent.ACTION_DOWN:
- Log.d(TAG, "onInterceptTouchEvent action:ACTION_DOWN");
- break;
- case MotionEvent.ACTION_MOVE:
- Log.d(TAG, "onInterceptTouchEvent action:ACTION_MOVE");
- break;
- case MotionEvent.ACTION_UP:
- Log.d(TAG, "onInterceptTouchEvent action:ACTION_UP");
- break;
- case MotionEvent.ACTION_CANCEL:
- Log.d(TAG, "onInterceptTouchEvent action:ACTION_CANCEL");
- break;
- }
- return false;
- }
- @Override
- public boolean onTouchEvent(MotionEvent ev) {
- int action = ev.getAction();
- switch (action) {
- case MotionEvent.ACTION_DOWN:
- Log.d(TAG, "---onTouchEvent action:ACTION_DOWN");
- break;
- case MotionEvent.ACTION_MOVE:
- Log.d(TAG, "---onTouchEvent action:ACTION_MOVE");
- break;
- case MotionEvent.ACTION_UP:
- Log.d(TAG, "---onTouchEvent action:ACTION_UP");
- break;
- case MotionEvent.ACTION_CANCEL:
- Log.d(TAG, "---onTouchEvent action:ACTION_CANCEL");
- break;
- }
- return true;
- }
- }
- /**
- * MyTestView.java
- * com.androidtest.touch.test
- *
- * Function： TODO
- *
- * ver date author
- * ──────────────────────────────────
- * 2011-5-24 Leon
- *
- * Copyright (c) 2011, TNT All Rights Reserved.
- */
- package com.androidtest.touch.test;
- import android.content.Context;
- import android.util.AttributeSet;
- import android.util.Log;
- import android.view.MotionEvent;
- import android.widget.TextView;
- /**
- * ClassName:MyTestView Function: TODO ADD FUNCTION Reason: TODO ADD REASON
- *
- * @author Leon
- * @version
- * @since Ver 1.1
- * @Date 2011-5-24
- */
- public class MyTestView extends TextView {
- public static final String TAG = MyTestView.class.getSimpleName();
- public MyTestView(Context context, AttributeSet attrs) {
- super(context, attrs);
- // TODO Auto-generated constructor stub
- Log.v(TAG, TAG);
- }
- @Override
- public boolean dispatchTouchEvent(MotionEvent ev) {
- int action = ev.getAction();
- switch (action) {
- case MotionEvent.ACTION_DOWN:
- Log.d(TAG, "dispatchTouchEvent action:ACTION_DOWN");
- break;
- case MotionEvent.ACTION_MOVE:
- Log.d(TAG, "dispatchTouchEvent action:ACTION_MOVE");
- break;
- case MotionEvent.ACTION_UP:
- Log.d(TAG, "dispatchTouchEvent action:ACTION_UP");
- break;
- case MotionEvent.ACTION_CANCEL:
- Log.d(TAG, "onTouchEvent action:ACTION_CANCEL");
- break;
- }
- return super.dispatchTouchEvent(ev);
- }
- @Override
- public boolean onTouchEvent(MotionEvent ev) {
- int action = ev.getAction();
- switch (action) {
- case MotionEvent.ACTION_DOWN:
- Log.d(TAG, "---onTouchEvent action:ACTION_DOWN");
- break;
- case MotionEvent.ACTION_MOVE:
- Log.d(TAG, "---onTouchEvent action:ACTION_MOVE");
- break;
- case MotionEvent.ACTION_UP:
- Log.d(TAG, "---onTouchEvent action:ACTION_UP");
- break;
- case MotionEvent.ACTION_CANCEL:
- Log.d(TAG, "---onTouchEvent action:ACTION_CANCEL");
- break;
- }
- return false;
- }
- }
- /**
- * TestTouchEvent.java
- * com.androidtest.touch.test
- *
- * Function： TODO
- *
- * ver date author
- * ──────────────────────────────────
- * 2011-5-24 Leon
- *
- * Copyright (c) 2011, TNT All Rights Reserved.
- */
- package com.androidtest.touch.test;
- import com.androidtest.R;
- import android.app.Activity;
- import android.os.Bundle;
- /**
- * ClassName:TestTouchEvent
- * Function: TODO ADD FUNCTION
- * Reason: TODO ADD REASON
- *
- * @author Leon
- * @version
- * @since Ver 1.1
- * @Date 2011-5-24
- */
- public class TestTouchEvent extends Activity{
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- // TODO Auto-generated method stub
- super.onCreate(savedInstanceState);
- this.setContentView(R.layout.test_touch_event);
- }
- }
- <?xml version="1.0" encoding="utf-8"?>
- <com.androidtest.touch.test.mylinearlayout android:gravity="center" android:layout_height="fill_parent" android:layout_width="fill_parent" android:orientation="vertical" xmlns:android="http://schemas.android.com/apk/res/android">
- <com.androidtest.touch.test.mytestview android:background="#FFFFFF" android:id="@+id/tv" android:layout_height="200px" android:layout_width="200px" android:text="leon" android:textcolor="#0000FF" android:textsize="40sp" android:textstyle="bold">
- </com.androidtest.touch.test.mytestview></com.androidtest.touch.test.mylinearlayout>
本文转自 最牛傻蛋 51CTO博客，原文链接：http://blog.51cto.com/zuiniuwang/718315，如需转载请自行联系原作者
