本文将带领读者全面分析Android事件处理机制，从基础概念到实际应用，通过代码实例详细阐述事件分发流程，并对比不同组件（如TextView、Button）在事件处理上的差异，旨在帮助开发者更深入理解并灵活运用这一核心机制。
Android 事件处理机制说难也不难，说简单也不简单，为什么这么说呢？因为我相信大部分有了一定 Android 基础的同学，想要分析 Android 事件处理机制，都是可以分析出来了；但要灵活运用它却又觉得很吃力，而且往往需要查阅各种资料文档，才能真正把它运用起来。今天我带领大家对 Android 事件处理机制做一次全方位的分析，从而达到大家对 Android 事件处理有一个更深、更形象的认识！
一、初体验：
相信大部分的人对 Android 事件处理机制的分析，都是通过打印 log 的方式，这里也是通过这种方式来分析；首先准备三个类 MainActivity 、EventLayout 、EventTextView ，这几个类分别是什么都做了些什么呢？我们看看代码就知道。
1、MainActivity
<code class=" hljs java"><span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">MainActivity</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">ActionBarActivity</span> {</span>
<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">protected</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onCreate</span>(Bundle savedInstanceState) {
<span class="hljs-keyword">super</span>.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">boolean</span> <span class="hljs-title">dispatchTouchEvent</span>(MotionEvent ev) {
<span class="hljs-keyword">boolean</span> handle = <span class="hljs-keyword">false</span> ;
String str = <span class="hljs-string">"ACTION_DOWN"</span>;
<span class="hljs-keyword">switch</span> (ev.getAction()){
<span class="hljs-keyword">case</span> MotionEvent.ACTION_DOWN:
str = <span class="hljs-string">"ACTION_DOWN"</span>;
<span class="hljs-keyword">break</span> ;
<span class="hljs-keyword">case</span> MotionEvent.ACTION_MOVE:
str = <span class="hljs-string">"ACTION_MOVE"</span>;
handle = <span class="hljs-keyword">true</span> ;
<span class="hljs-keyword">break</span>;
<span class="hljs-keyword">case</span> MotionEvent.ACTION_UP:
str = <span class="hljs-string">"ACTION_UP"</span>;
<span class="hljs-keyword">break</span>;
}
Log.v(<span class="hljs-string">"zgy"</span>,<span class="hljs-string">"=====Activity=====dispatchTouchEvent========"</span>+str) ;
<span class="hljs-keyword">return</span> <span class="hljs-keyword">super</span>.dispatchTouchEvent(ev);
}
<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">boolean</span> <span class="hljs-title">onTouchEvent</span>(MotionEvent event) {
String str = <span class="hljs-string">"ACTION_DOWN"</span>;
<span class="hljs-keyword">boolean</span> handle = <span class="hljs-keyword">false</span> ;
<span class="hljs-keyword">switch</span> (event.getAction()){
<span class="hljs-keyword">case</span> MotionEvent.ACTION_DOWN:
str = <span class="hljs-string">"ACTION_DOWN"</span>;
<span class="hljs-keyword">break</span> ;
<span class="hljs-keyword">case</span> MotionEvent.ACTION_MOVE:
str = <span class="hljs-string">"ACTION_MOVE"</span>;
handle = <span class="hljs-keyword">true</span> ;
<span class="hljs-keyword">break</span>;
<span class="hljs-keyword">case</span> MotionEvent.ACTION_UP:
str = <span class="hljs-string">"ACTION_UP"</span>;
<span class="hljs-keyword">break</span>;
}
Log.v(<span class="hljs-string">"zgy"</span>,<span class="hljs-string">"=====Activity=====onTouchEvent========"</span>+str) ;
<span class="hljs-keyword">return</span> <span class="hljs-keyword">super</span>.onTouchEvent(event);
}
}</code>
2、EventLayout
<code class=" hljs java"><span class="hljs-javadoc">/**
* Created by gyzhong on 15/2/18.
*/</span>
<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">EventLayout</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">LinearLayout</span> {</span>
<span class="hljs-keyword">public</span> <span class="hljs-title">EventLayout</span>(Context context) {
<span class="hljs-keyword">super</span>(context);
}
<span class="hljs-keyword">public</span> <span class="hljs-title">EventLayout</span>(Context context, AttributeSet attrs) {
<span class="hljs-keyword">super</span>(context, attrs);
}
<span class="hljs-keyword">public</span> <span class="hljs-title">EventLayout</span>(Context context, AttributeSet attrs, <span class="hljs-keyword">int</span> defStyleAttr) {
<span class="hljs-keyword">super</span>(context, attrs, defStyleAttr);
}
<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">boolean</span> <span class="hljs-title">onInterceptTouchEvent</span>(MotionEvent ev) {
String str = <span class="hljs-string">"ACTION_DOWN"</span>;
<span class="hljs-keyword">switch</span> (ev.getAction()){
<span class="hljs-keyword">case</span> MotionEvent.ACTION_DOWN:
str = <span class="hljs-string">"ACTION_DOWN"</span>;
<span class="hljs-keyword">break</span> ;
<span class="hljs-keyword">case</span> MotionEvent.ACTION_MOVE:
str = <span class="hljs-string">"ACTION_MOVE"</span>;
<span class="hljs-keyword">break</span>;
<span class="hljs-keyword">case</span> MotionEvent.ACTION_UP:
str = <span class="hljs-string">"ACTION_UP"</span>;
<span class="hljs-keyword">break</span>;
}
Log.v(<span class="hljs-string">"zgy"</span>, <span class="hljs-string">"=====ViewGroup=====onInterceptTouchEvent========"</span>+str) ;
<span class="hljs-keyword">if</span>(handle){
<span class="hljs-keyword">return</span> handle ;
}
<span class="hljs-keyword">return</span> <span class="hljs-keyword">super</span>.onInterceptTouchEvent(ev);
}
<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">boolean</span> <span class="hljs-title">dispatchTouchEvent</span>(MotionEvent ev) {
<span class="hljs-keyword">boolean</span> handle = <span class="hljs-keyword">false</span> ;
<span class="hljs-keyword">switch</span> (ev.getAction()){
<span class="hljs-keyword">case</span> MotionEvent.ACTION_DOWN:
str = <span class="hljs-string">"ACTION_DOWN"</span>;
<span class="hljs-keyword">break</span> ;
<span class="hljs-keyword">case</span> MotionEvent.ACTION_MOVE:
str = <span class="hljs-string">"ACTION_MOVE"</span>;
<span class="hljs-keyword">break</span>;
<span class="hljs-keyword">case</span> MotionEvent.ACTION_UP:
str = <span class="hljs-string">"ACTION_UP"</span>;
<span class="hljs-keyword">break</span>;
}
Log.v(<span class="hljs-string">"zgy"</span>, <span class="hljs-string">"=====ViewGroup=====dispatchTouchEvent========"</span>+str) ;
<span class="hljs-keyword">if</span>(handle){
<span class="hljs-keyword">return</span> handle ;
}
<span class="hljs-keyword">return</span> <span class="hljs-keyword">super</span>.dispatchTouchEvent(ev);
}
<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">boolean</span> <span class="hljs-title">onTouchEvent</span>(MotionEvent event) {
String str = <span class="hljs-string">"ACTION_DOWN"</span>;
<span class="hljs-keyword">switch</span> (event.getAction()){
<span class="hljs-keyword">case</span> MotionEvent.ACTION_DOWN:
str = <span class="hljs-string">"ACTION_DOWN"</span>;
<span class="hljs-keyword">break</span> ;
<span class="hljs-keyword">case</span> MotionEvent.ACTION_MOVE:
str = <span class="hljs-string">"ACTION_MOVE"</span>;
<span class="hljs-keyword">break</span>;
<span class="hljs-keyword">case</span> MotionEvent.ACTION_UP:
str = <span class="hljs-string">"ACTION_UP"</span>;
<span class="hljs-keyword">break</span>;
}
Log.v(<span class="hljs-string">"zgy"</span>,<span class="hljs-string">"=====ViewGroup=====onTouchEvent========"</span>+str) ;
<span class="hljs-keyword">return</span> <span class="hljs-keyword">super</span>.onTouchEvent(event);
}
}</code>
3、EventTextView
<code class=" hljs java"><span class="hljs-javadoc">/**
* Created by gyzhong on 15/2/18.
*/</span>
<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">EventTextView</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">TextView</span> {</span>
<span class="hljs-keyword">public</span> <span class="hljs-title">EventTextView</span>(Context context) {
<span class="hljs-keyword">super</span>(context);
}
<span class="hljs-keyword">public</span> <span class="hljs-title">EventTextView</span>(Context context, AttributeSet attrs) {
<span class="hljs-keyword">super</span>(context, attrs);
}
<span class="hljs-keyword">public</span> <span class="hljs-title">EventTextView</span>(Context context, AttributeSet attrs, <span class="hljs-keyword">int</span> defStyleAttr) {
<span class="hljs-keyword">super</span>(context, attrs, defStyleAttr);
}
<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">boolean</span> <span class="hljs-title">dispatchTouchEvent</span>(MotionEvent ev) {
String str = <span class="hljs-string">"ACTION_DOWN"</span>;
<span class="hljs-keyword">switch</span> (ev.getAction()){
<span class="hljs-keyword">case</span> MotionEvent.ACTION_DOWN:
str = <span class="hljs-string">"ACTION_DOWN"</span>;
<span class="hljs-keyword">break</span> ;
<span class="hljs-keyword">case</span> MotionEvent.ACTION_MOVE:
str = <span class="hljs-string">"ACTION_MOVE"</span>;
<span class="hljs-keyword">break</span>;
<span class="hljs-keyword">case</span> MotionEvent.ACTION_UP:
str = <span class="hljs-string">"ACTION_UP"</span>;
<span class="hljs-keyword">break</span>;
}
Log.v(<span class="hljs-string">"zgy"</span>, <span class="hljs-string">"=====View=====dispatchTouchEvent========"</span>+str+ <span class="hljs-string">",getX() ="</span>+ev.getX()) ;
<span class="hljs-keyword">return</span> <span class="hljs-keyword">super</span>.dispatchTouchEvent(ev);
}
<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">boolean</span> <span class="hljs-title">onTouchEvent</span>(MotionEvent event) {
String str = <span class="hljs-string">"ACTION_DOWN"</span>;
<span class="hljs-keyword">boolean</span> handle = <span class="hljs-keyword">false</span> ;
<span class="hljs-keyword">switch</span> (event.getAction()){
<span class="hljs-keyword">case</span> MotionEvent.ACTION_DOWN:
str = <span class="hljs-string">"ACTION_DOWN"</span>;
<span class="hljs-keyword">break</span> ;
<span class="hljs-keyword">case</span> MotionEvent.ACTION_MOVE:
str = <span class="hljs-string">"ACTION_MOVE"</span>;
<span class="hljs-keyword">break</span>;
<span class="hljs-keyword">case</span> MotionEvent.ACTION_UP:
str = <span class="hljs-string">"ACTION_UP"</span>;
<span class="hljs-keyword">break</span>;
}
Log.v(<span class="hljs-string">"zgy"</span>,<span class="hljs-string">"=====View=====onTouchEvent========"</span>+str) ;
<span class="hljs-keyword">return</span> <span class="hljs-keyword">super</span>.onTouchEvent(event);
}
}</code>
通过代码可以看到，3个类基本上什么都没做，只是重写了父类的dispatchTouchEvent、onTouchEvent、onInterceptTouchEvent方法，也只是在其中加入了调试信息，那再来看看 xml
<code class=" hljs avrasm"><<span class="hljs-keyword">com</span><span class="hljs-preprocessor">.gyzhong</span><span class="hljs-preprocessor">.eventdemo</span><span class="hljs-preprocessor">.EventLayout</span> xmlns:android=<span class="hljs-string">"http://schemas.android.com/apk/res/android"</span>
android:layout_width=<span class="hljs-string">"match_parent"</span>
android:layout_height=<span class="hljs-string">"match_parent"</span>
android:orientation=<span class="hljs-string">"vertical"</span>
android:layout_gravity=<span class="hljs-string">"center_horizontal"</span>
>
<<span class="hljs-keyword">com</span><span class="hljs-preprocessor">.gyzhong</span><span class="hljs-preprocessor">.eventdemo</span><span class="hljs-preprocessor">.EventTextView</span>
android:layout_width=<span class="hljs-string">"120dp"</span>
android:layout_height=<span class="hljs-string">"60dp"</span>
android:gravity=<span class="hljs-string">"center"</span>
android:text=<span class="hljs-string">"eventText"</span>/>
</<span class="hljs-keyword">com</span><span class="hljs-preprocessor">.gyzhong</span><span class="hljs-preprocessor">.eventdemo</span><span class="hljs-preprocessor">.EventLayout</span>></code>
这里把我们重写的 自定义的 View 放入布局中。运行代码，开始调试，然后点击EventTextView可以看到 log 信息：
<code class=" hljs haml">=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onInterceptTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_UP</span></span></code>
通过信息和结合我们所学的知识点，还是很容易得出结论来：
Activity 的 dispatchTouchEvent的事件分发给ViewGroup，ViewGroup先通过事件拦截onInterceptTouchEvent（只有 ViewGroup 才有此方法）来判断，是否拦截，如果没有拦截则将事件分发给 View 的分发机制dispatchTouchEvent；View 获取到事件后，就开始调用 onTouchEvent 方法，如果 View 的 onTouchEvent 未把事件消费掉，则把事件有传递给 ViewGroup 的 onTouchEvent，同理，ViewGroup
未把事件消费掉，继续往下级传到了 Activity 的 onTouchEvent 事件处理中。文字讲解终究是有点难理解，需要结合图文来讲解，那么我们来看下下面这张图，应该很清晰明了。
通过上图，我们可以得出以下几点结论：
1、Android 事件传递是层级传递的；
2、dispatchTouchEvent从底层向上层传递，而onTouchEvent刚好相反；
3、onInterceptTouchEvent返回为 true 时，将执行同层级的onTouchEvent，而dispatchTouchEvent和onTouchEvent返回 true 时，将终止事件的传递。
上面我们提到了两个关键词，拦截和消费，其实都是图片中表示的 return 返回值，在 dispatchTouchEvent 我们习惯用拦截，而在 onTouchEvent 中则习惯用消费来说明（个人习惯而已）。return false 表示事件未被dispatchTouchEvent拦截，也未被onTouchEvent消费。好了，到此我们的Android 事件处理机制分析完了，感谢大家的阅读。汗、汗、汗、、、 真的分析完了吗，如果只是这样就结束了，我也不会在大过年的，在这里苦逼苦逼的写 blog。那么接下来我们进入第二阶段。
二、深度剖析
还记得前面第一阶段的标题”初体验”为什么叫初体验呢？大致可以认为是我们的第一印象，我们最初感觉出来的东西。无论是根据自己的逻辑来推理，还是根据刚刚我们看到的调试信息来看，事件处理机的制整体流程都是按照上面图1-1的流程来走的。但是，细心的同学肯定看到了最后两行调试信息
<code class=" hljs haml">=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_UP</span></span></code>
对，你没有看错，我也没有调错，ACTION_UP的时候它确实只打印了两行，并都是在 Activity 中打印的。并不像 ACTION_DOWN 的时候执行了
<code class=" hljs haml">=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onInterceptTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span></span></code>
也许这样看还不明显，再来看看一下调试信息
<code class=" hljs haml">=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onInterceptTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_UP</span></span></code>
这里可以看到只有在 ACTION_DOWN 的时候是按照我们分析的流程图来执行，而 ACTION_MOVE、ACTION_UP 都只是执行了 Activity 的dispatchTouchEvent和onTouchEvent，这是为什么？难道我们不是按照上面那张流程图的流程来执行？这里我可以肯定的告诉大家，上面那张图的流程是绝对没有问题的，只是有些事件被拦截或消费掉。并且这里告诉大家一个结论：
ViewGroup 和 View的dispatchTouchEvent分发事件在 action 为ACTION_DOWN时没有被拦截且onTouchEvent的处理事件在 action 为ACTION_DOWN时未被消费，当 action 为ACTION_MOVE或ACTION_UP时，dispatchTouchEvent和onTouchEvent只有在 activity 被调用。想搞清楚和验证这个结论的同学，可以自己根据源码深入探究！
通过以上结论，可知，在手指滑动或者抬起的时候，ViewGroup 和 View 的dispatchTouchEvent和onTouchEvent未被执行，因为事件未被拦截或者消费。
我在网上看过一些 Android 事件处理机制的帖子和 bolg，我记得有这样一个问题，为什么我在分析 Android 事件处理的时候，用 TextView 和 Button ，分析出来的结果不一样呢？这里我们用的是 TextView 分析的，我们也来看看 Button 的效果，到底哪里不一样。新建一个 EventButton类和 EventTextView 一样，除了继承的对象不同之外。
<code class=" hljs java">EventButton
<span class="hljs-javadoc">/**
* Created by gyzhong on 15/2/18.
*/</span>
<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">EventButton</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Button</span> {</span>
<span class="hljs-keyword">public</span> <span class="hljs-title">EventButton</span>(Context context) {
<span class="hljs-keyword">super</span>(context);
}
<span class="hljs-keyword">public</span> <span class="hljs-title">EventButton</span>(Context context, AttributeSet attrs) {
<span class="hljs-keyword">super</span>(context, attrs);
}
<span class="hljs-keyword">public</span> <span class="hljs-title">EventButton</span>(Context context, AttributeSet attrs, <span class="hljs-keyword">int</span> defStyleAttr) {
<span class="hljs-keyword">super</span>(context, attrs, defStyleAttr);
}
<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">boolean</span> <span class="hljs-title">dispatchTouchEvent</span>(MotionEvent ev) {
String str = <span class="hljs-string">"ACTION_DOWN"</span>;
<span class="hljs-keyword">switch</span> (ev.getAction()){
<span class="hljs-keyword">case</span> MotionEvent.ACTION_DOWN:
str = <span class="hljs-string">"ACTION_DOWN"</span>;
<span class="hljs-keyword">break</span> ;
<span class="hljs-keyword">case</span> MotionEvent.ACTION_MOVE:
str = <span class="hljs-string">"ACTION_MOVE"</span>;
<span class="hljs-keyword">break</span>;
<span class="hljs-keyword">case</span> MotionEvent.ACTION_UP:
str = <span class="hljs-string">"ACTION_UP"</span>;
<span class="hljs-keyword">break</span>;
}
Log.v(<span class="hljs-string">"zgy"</span>, <span class="hljs-string">"=====View=====dispatchTouchEvent========"</span>+str+ <span class="hljs-string">",getX() ="</span>+ev.getX()) ;
<span class="hljs-keyword">return</span> <span class="hljs-keyword">super</span>.dispatchTouchEvent(ev);
}
<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">boolean</span> <span class="hljs-title">onTouchEvent</span>(MotionEvent event) {
String str = <span class="hljs-string">"ACTION_DOWN"</span>;
<span class="hljs-keyword">boolean</span> handle = <span class="hljs-keyword">false</span> ;
<span class="hljs-keyword">switch</span> (event.getAction()){
<span class="hljs-keyword">case</span> MotionEvent.ACTION_DOWN:
str = <span class="hljs-string">"ACTION_DOWN"</span>;
<span class="hljs-keyword">break</span> ;
<span class="hljs-keyword">case</span> MotionEvent.ACTION_MOVE:
str = <span class="hljs-string">"ACTION_MOVE"</span>;
<span class="hljs-keyword">break</span>;
<span class="hljs-keyword">case</span> MotionEvent.ACTION_UP:
str = <span class="hljs-string">"ACTION_UP"</span>;
<span class="hljs-keyword">break</span>;
}
Log.v(<span class="hljs-string">"zgy"</span>,<span class="hljs-string">"=====View=====onTouchEvent========"</span>+str) ;
<span class="hljs-keyword">return</span> <span class="hljs-keyword">super</span>.onTouchEvent(event);
}
}</code>
记得别忘记修改 xml 中的内容
<code class=" hljs avrasm"><<span class="hljs-keyword">com</span><span class="hljs-preprocessor">.gyzhong</span><span class="hljs-preprocessor">.eventdemo</span><span class="hljs-preprocessor">.EventLayout</span> xmlns:android=<span class="hljs-string">"http://schemas.android.com/apk/res/android"</span>
android:layout_width=<span class="hljs-string">"match_parent"</span>
android:layout_height=<span class="hljs-string">"match_parent"</span>
android:orientation=<span class="hljs-string">"vertical"</span>
android:layout_gravity=<span class="hljs-string">"center_horizontal"</span>
>
<<span class="hljs-keyword">com</span><span class="hljs-preprocessor">.gyzhong</span><span class="hljs-preprocessor">.eventdemo</span><span class="hljs-preprocessor">.EventButton</span>
android:layout_width=<span class="hljs-string">"120dp"</span>
android:layout_height=<span class="hljs-string">"60dp"</span>
android:gravity=<span class="hljs-string">"center"</span>
android:text=<span class="hljs-string">"eventButton"</span>/>
</<span class="hljs-keyword">com</span><span class="hljs-preprocessor">.gyzhong</span><span class="hljs-preprocessor">.eventdemo</span><span class="hljs-preprocessor">.EventLayout</span>></code>
再次运行代码，果然，结果不一样
<code class=" hljs haml">=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onInterceptTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onInterceptTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onInterceptTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onInterceptTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====onTouchEvent========<span class="hljs-constant">ACTION_UP</span></span></code>
我们根据调试结果再加上流程图不难推测出，在 View 的 onTouchEvent 的事件处理机制中把事件消费掉了，并且在 action 为 ACTION_DOWN、ACTION_MOVE、ACTION_UP 的时候全部消费掉了，所以不会再往下执行，那我们就来看看源码是否如此。
进入到 View 的onTouchEvent方法中
<code class=" hljs cs"><span class="hljs-keyword">public</span> boolean <span class="hljs-title">onTouchEvent</span>(MotionEvent <span class="hljs-keyword">event</span>) {
<span class="hljs-comment">//省略部分代码</span>
<span class="hljs-keyword">if</span> (((viewFlags & CLICKABLE) == CLICKABLE ||
(viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) {
}
<span class="hljs-comment">//省略很多代码</span>
<span class="hljs-keyword">return</span> <span class="hljs-keyword">true</span>;
}
<span class="hljs-keyword">return</span> <span class="hljs-keyword">false</span>;
}</code>
以上代码，我把有用的几行提取出来了，可以看到，有一个判断条件，如果 View 是可以点击的状态，return true 事件将会被消费掉，否则 return false 不会被消费掉。而我们都知道 TextView 默认状态是不可点击的， Button 是可以点击的，所以这也就是为什么 TextView 和 Button 的调试效果不一样，如果把 Button 设为不可点击，效果就和 TextView 的完全一样，有兴趣的同学可以自己尝试一下。
四、总结
讲了那么多，其实核心就是那张图片，只要掌握了那张图片中事件的流程基本上就没什么问题了；
这张图反应出来的信息有：
1、Android 事件传递是层级传递的；
2、dispatchTouchEvent从低级向上级传递，而onTouchEvent刚好相反；
3、onInterceptTouchEvent返回为 true 时，将执行同级的onTouchEvent，而dispatchTouchEvent和onTouchEvent返回 true 时，将终止事件的传递。
还有一点特别重要，也是比较难理解的一点，就是我前面说的那个结论。
ViewGroup 和 View的dispatchTouchEvent分发事件在 action 为ACTION_DOWN时没有被拦截且onTouchEvent的处理事件在 action 为ACTION_DOWN时未被消费，当 action 为ACTION_MOVE或ACTION_UP时，dispatchTouchEvent和onTouchEvent只有在 activity 被调用。
最后我将在下篇 blog 中，通过自定义通用型的下拉刷新来实战事件处理机制，如果有兴趣的同学，可以关注。
这里附上一张 时序图和log 信息
<code class=" hljs haml">Activity dispatchTouchEvent——->Action == ACTION_DOWN return true =<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span> Activity dispatchTouchEvent——->Action == ACTION_MOVE return true =<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onInterceptTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span> Activity dispatchTouchEvent——->Action == ACTION_UP return true =<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onInterceptTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span> ViewGroup dispatchTouchEvent——->Action == ACTION_DOWN return true =<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span> ViewGroup dispatchTouchEvent——->Action == ACTION_MOVE return true =<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onInterceptTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span> ViewGroup dispatchTouchEvent——->Action == ACTION_UP return true =<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onInterceptTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span> ViewGroup onInterceptTouchEvent——->Action == ACTION_DOWN return true =<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onInterceptTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span> View dispatchTouchEvent——->Action == ACTION_DOWN return true =<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onInterceptTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onInterceptTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onInterceptTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====onTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span> View dispatchTouchEvent——->Action == ACTION_MOVE return true =<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onInterceptTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span> View dispatchTouchEvent——->Action == ACTION_UP return true =<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onInterceptTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span> View onTouchEvent ——->Action == ACTION_DOWN return true =<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onInterceptTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onInterceptTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onInterceptTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====onTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span> View onTouchEvent ——->Action == ACTION_MOVE return true =<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onInterceptTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span> View onTouchEvent ——->Action == ACTION_UP return true =<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onInterceptTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span> ViewGroup onTouchEvent ——->Action == ACTION_DOWN return true =<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onInterceptTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span> ViewGroup onTouchEvent ——->Action == ACTION_MOVE return true =<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onInterceptTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span> ViewGroup onTouchEvent ——->Action == ACTION_UP return true =<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onInterceptTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">View</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">ViewGroup</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_DOWN</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_MOVE</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====dispatchTouchEvent========<span class="hljs-constant">ACTION_UP</span> </span>=<span class="ruby">====<span class="hljs-constant">Activity</span>=====onTouchEvent========<span class="hljs-constant">ACTION_UP</span></span></code>
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