说明：本博客为原创，转载请注明出处 -ANDROID 笔记栈 由于作者水平有限，错误在所难免，请见谅，可以留言，本人会及时改正

---

索引

Activity View TouchEvent传递关系图Demo

---

Android Touch事件主要有三个方法： dispatchTouchEvent（分发）: Touch事件的入口方法 onInterceptTouchEvent（拦截）：ViewGroup拦截事件，不传递给子View onTouchEvent（处理）：是否消费事件

Activity和View都可以处理TouchEvent事件,Activity是所有事件的入口

TouchEvent 事件是从上而下，从外而内开始传递

Activity(window、DecorView) -> ViewGroup -> View

---

Activity View TouchEvent

事件dispatchTouchEventonInterceptTouchEventonTouchEventActivity√×√ViewGroup√√√View√×√

1.分发事件

public boolean dispatchTouchEvent(MotionEvent ev) { return true; // true,MotionEvent已被消费 // 不调用**super.dispatchTouchEvent()**方法，其他两个方法是不会被调用的！ // 该方法返回false，代表没有View对该事件进行消费，后续事件将不会被分发给你当前View。 // super.dispatchTouchEvent()返回结果是根据子View的dispatchTouchEvent方法或者当前View的onTouchEvent方法的返回结果而决定的。 // 在ViewGroup中，根据特定的排列顺序遍历子Child，调用子View的dispatchTouchEvent的方法来实现事件的分发。 // （Actvity 永远接收dispatchTouchEvent事件） }

-如果TouchEvent事件在传递过程中，没有View/ViewGroup对“DOWN”事件进行消费，后续TouchEvent事件(MOVE,UP,CANCEL等)只会被分发到Activity中。

2.拦截事件

public boolean onInterceptTouchEvent(MotionEvent ev) { return true; // true,MotionEvent被当前ViewGroup拦截 //不会传递给子View的dispatchTouchEvent(),ViewGroup的onTouchEvent（）会被调用。 //这个方法，SDK文档中有如下说明：（翻译的水平有限，请见谅） //1.在这个方法中可以接收“DOWN”事件 //2.... //3.这个方法返回false，后续事件将会先传递到该方法，随后传到后onTouch方法中 //4.这个方法返回true,你将不会接收到如下事件：目标View将会接收到一个CANCEL事件，所有的后续事件将会被传递到onTouchEvnet方法中，该方法将不再接收事件 }

onInterceptTouchEvent不是很好理解，可以参考这篇博文：Android 触摸事件机制(四) ViewGroup中触摸事件详解

3.处理事件

public boolean onTouchEvent(MotionEvent ev) { return true; // true,MotionEvent被消费 }

---

传递关系图

ViewGroup中的onInterceptTouchEvent方法，在Action为“DOWN”的时候或者ViewGroup子View有消费TouchEvnet事件的时候（可能有多个子View对TouchEvnet事件进行相应，这些View组成了TouchTarget链表）会被调用

---

Demo

GitHub地址: GitHub 环境: Windows7+JAVA8 IDE: AndroidStdio2.2.2 compileSdkVersion:24 测试设备:Nexus5(6.0.1)

Demo中存在多个示例，请在Manifest中更改启动项。

自定义DLFrameLayout继承与FrameLayout,自定义DLView继承与View

分别重载Touch事件的方法，输出日志,代码如下：

@Override public boolean dispatchTouchEvent(MotionEvent ev) { DLDebug.info(TAG, "dispatchTouchEvent: " + TouchEventHelper.parseAction((ev.getActionMasked())));//输出日志 boolean dispatchTouchEvent = mDispatchTouchEvent; if (mSuperDispatchTouchEvent)//是否调用super方法 { dispatchTouchEvent = super.dispatchTouchEvent(ev) || mDispatchTouchEvent; } DLDebug.info(TAG, "dispatchTouchEvent: " + dispatchTouchEvent);//输出日志，true/false return dispatchTouchEvent; } @Override public boolean onInterceptTouchEvent(MotionEvent ev) { DLDebug.info(TAG, "onInterceptTouchEvent: " + TouchEventHelper.parseAction((ev.getActionMasked()))); boolean onInterceptTouchEvent = mInterceptTouchEvent; if (mSuperInterceptTouchEvent) { onInterceptTouchEvent = super.onInterceptTouchEvent(ev) || mInterceptTouchEvent; } DLDebug.info(TAG, "onInterceptTouchEvent: " + onInterceptTouchEvent); return onInterceptTouchEvent; } @Override public boolean onTouchEvent(MotionEvent ev) { DLDebug.info(TAG, "onTouchEvent: " + TouchEventHelper.parseAction((ev.getActionMasked()))); boolean onTouchEvent = mTouchEvent; if (mSuperTouchEvent) { onTouchEvent = super.onTouchEvent(ev) || mTouchEvent; } DLDebug.info(TAG, "onTouchEvent: " + onTouchEvent); return onTouchEvent; } 验证结果 如果自定义View所有方法都返回false，那么后续事件不会被传递到View或者ViewGroup中，只会被传递到Activity中输出日志如下： 12-05 15:10:35.440 V/DL_MainActivity: dispatchTouchEvent: DOWN 12-05 15:10:35.440 I/DL_DLFrameLayout: dispatchTouchEvent: DOWN 12-05 15:10:35.440 I/DL_DLFrameLayout: onInterceptTouchEvent: DOWN 12-05 15:10:35.440 I/DL_DLFrameLayout: onInterceptTouchEvent: false 12-05 15:10:35.440 D/DL_DLView: dispatchTouchEvent: DOWN 12-05 15:10:35.441 D/DL_DLView: onTouchEvent: DOWN 12-05 15:10:35.441 D/DL_DLView: onTouchEvent: false 12-05 15:10:35.441 D/DL_DLView: dispatchTouchEvent: false 12-05 15:10:35.441 I/DL_DLFrameLayout: onTouchEvent: DOWN 12-05 15:10:35.441 I/DL_DLFrameLayout: onTouchEvent: false 12-05 15:10:35.441 I/DL_DLFrameLayout: dispatchTouchEvent: false 12-05 15:10:35.441 V/DL_MainActivity: onTouchEvent: DOWN 12-05 15:10:35.441 V/DL_MainActivity: onTouchEvent: false 12-05 15:10:35.441 V/DL_MainActivity: dispatchTouchEvent: false 12-05 15:10:35.634 V/DL_MainActivity: dispatchTouchEvent: MOVE 12-05 15:10:35.634 V/DL_MainActivity: onTouchEvent: MOVE 12-05 15:10:35.634 V/DL_MainActivity: onTouchEvent: false 12-05 15:10:35.634 V/DL_MainActivity: dispatchTouchEvent: false .... 12-05 15:10:36.021 V/DL_MainActivity: dispatchTouchEvent: UP 12-05 15:10:36.021 V/DL_MainActivity: onTouchEvent: UP 12-05 15:10:36.021 V/DL_MainActivity: onTouchEvent: false 12-05 15:10:36.021 V/DL_MainActivity: dispatchTouchEvent: false // 根据日志可以看出，后续的MOVE/UP事件没有传递到自定义View中。 验证结果如果ViewGroup onInterceptTouchEvent()中返回true，并且onTouchEvent()中也返回true，那么事件不会被传递到子View中，并且能接收后续事件。

输入日志如下：

12-05 15:38:03.241 V/DL_MainActivity: dispatchTouchEvent: DOWN 12-05 15:38:03.241 I/DL_DLFrameLayout: dispatchTouchEvent: DOWN 12-05 15:38:03.241 I/DL_DLFrameLayout: onInterceptTouchEvent: DOWN 12-05 15:38:03.241 I/DL_DLFrameLayout: onInterceptTouchEvent: true 12-05 15:38:03.241 I/DL_DLFrameLayout: onTouchEvent: DOWN 12-05 15:38:03.241 I/DL_DLFrameLayout: onTouchEvent: true 12-05 15:38:03.241 I/DL_DLFrameLayout: dispatchTouchEvent: true 12-05 15:38:03.242 V/DL_MainActivity: dispatchTouchEvent: true 12-05 15:38:03.268 V/DL_MainActivity: dispatchTouchEvent: MOVE 12-05 15:38:03.268 I/DL_DLFrameLayout: dispatchTouchEvent: MOVE 12-05 15:38:03.268 I/DL_DLFrameLayout: onTouchEvent: MOVE 12-05 15:38:03.269 I/DL_DLFrameLayout: onTouchEvent: true 12-05 15:38:03.269 I/DL_DLFrameLayout: dispatchTouchEvent: true 12-05 15:38:03.269 V/DL_MainActivity: dispatchTouchEvent: true 12-05 15:38:03.285 V/DL_MainActivity: dispatchTouchEvent: MOVE 12-05 15:38:03.285 I/DL_DLFrameLayout: dispatchTouchEvent: MOVE 12-05 15:38:03.285 I/DL_DLFrameLayout: onTouchEvent: MOVE 12-05 15:38:03.285 I/DL_DLFrameLayout: onTouchEvent: true 12-05 15:38:03.285 I/DL_DLFrameLayout: dispatchTouchEvent: true 12-05 15:38:03.285 V/DL_MainActivity: dispatchTouchEvent: true 12-05 15:38:03.302 V/DL_MainActivity: dispatchTouchEvent: MOVE 12-05 15:38:03.302 I/DL_DLFrameLayout: dispatchTouchEvent: MOVE 12-05 15:38:03.302 I/DL_DLFrameLayout: onTouchEvent: MOVE 12-05 15:38:03.302 I/DL_DLFrameLayout: onTouchEvent: true 12-05 15:38:03.302 I/DL_DLFrameLayout: dispatchTouchEvent: true 12-05 15:38:03.302 V/DL_MainActivity: dispatchTouchEvent: true 12-05 15:38:03.318 V/DL_MainActivity: dispatchTouchEvent: MOVE 12-05 15:38:03.318 I/DL_DLFrameLayout: dispatchTouchEvent: MOVE 12-05 15:38:03.318 I/DL_DLFrameLayout: onTouchEvent: MOVE 12-05 15:38:03.318 I/DL_DLFrameLayout: onTouchEvent: true 12-05 15:38:03.318 I/DL_DLFrameLayout: dispatchTouchEvent: true 12-05 15:38:03.318 V/DL_MainActivity: dispatchTouchEvent: true 12-05 15:38:03.323 V/DL_MainActivity: dispatchTouchEvent: UP 12-05 15:38:03.323 I/DL_DLFrameLayout: dispatchTouchEvent: UP 12-05 15:38:03.323 I/DL_DLFrameLayout: onTouchEvent: UP 12-05 15:38:03.323 I/DL_DLFrameLayout: onTouchEvent: true 12-05 15:38:03.323 I/DL_DLFrameLayout: dispatchTouchEvent: true 12-05 15:38:03.323 V/DL_MainActivity: dispatchTouchEvent: true //事件确实没有传递到子View中，ViewGroup接收了MOVE/UP事件

大家可以下载源码，察看其他情况下的输出结果

---