1.Activity事件处理

package com.example.eventdemo01;import androidx.appcompat.app.AppCompatActivity;import android.os.Bundle;
import android.view.MotionEvent;public class MainActivity extends AppCompatActivity {private static final String TAG = "xtm";@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);}@Overridepublic boolean dispatchTouchEvent(MotionEvent ev) {DebugUtils.printLogD(TAG,"Activity dispatchTouchEvent.");return super.dispatchTouchEvent(ev);}@Overridepublic boolean onTouchEvent(MotionEvent event) {DebugUtils.printLogD(TAG,"Activity onTouchEvent.");return super.onTouchEvent(event);}}

按下：会回调一次dispatchTouchEvent，onTouchEvent

移动：多次回调dispatchTouchEvent，onTouchEvent

抬起：会回调一次dispatchTouchEvent，onTouchEvent

相关日志：

// 按下
2020-12-28 09:51:49.210 17300-17300/com.example.eventdemo01 D/xtm: Activity dispatchTouchEvent.
2020-12-28 09:51:49.210 17300-17300/com.example.eventdemo01 D/xtm: Activity onTouchEvent.
// 移动
2020-12-28 09:51:49.848 17300-17300/com.example.eventdemo01 D/xtm: Activity dispatchTouchEvent.
2020-12-28 09:51:49.848 17300-17300/com.example.eventdemo01 D/xtm: Activity onTouchEvent.
2020-12-28 09:51:49.865 17300-17300/com.example.eventdemo01 D/xtm: Activity dispatchTouchEvent.
2020-12-28 09:51:49.865 17300-17300/com.example.eventdemo01 D/xtm: Activity onTouchEvent.
2020-12-28 09:51:49.881 17300-17300/com.example.eventdemo01 D/xtm: Activity dispatchTouchEvent.
2020-12-28 09:51:49.881 17300-17300/com.example.eventdemo01 D/xtm: Activity onTouchEvent.
2020-12-28 09:51:49.897 17300-17300/com.example.eventdemo01 D/xtm: Activity dispatchTouchEvent.
2020-12-28 09:51:49.898 17300-17300/com.example.eventdemo01 D/xtm: Activity onTouchEvent.
2020-12-28 09:51:49.915 17300-17300/com.example.eventdemo01 D/xtm: Activity dispatchTouchEvent.
2020-12-28 09:51:49.915 17300-17300/com.example.eventdemo01 D/xtm: Activity onTouchEvent.
2020-12-28 09:51:49.932 17300-17300/com.example.eventdemo01 D/xtm: Activity dispatchTouchEvent.
2020-12-28 09:51:49.932 17300-17300/com.example.eventdemo01 D/xtm: Activity onTouchEvent.
2020-12-28 09:51:49.948 17300-17300/com.example.eventdemo01 D/xtm: Activity dispatchTouchEvent.
2020-12-28 09:51:49.948 17300-17300/com.example.eventdemo01 D/xtm: Activity onTouchEvent.
// 抬起
2020-12-28 09:51:50.962 17300-17300/com.example.eventdemo01 D/xtm: Activity dispatchTouchEvent.
2020-12-28 09:51:50.962 17300-17300/com.example.eventdemo01 D/xtm: Activity onTouchEvent.

2.ViewGroup事件处理

自定义一个ViewGroup

package com.example.eventdemo01;import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.LinearLayout;public class MyViewGroup extends LinearLayout {private static final String TAG = "xtm";public MyViewGroup(Context context, AttributeSet attrs) {super(context, attrs);}@Overridepublic boolean dispatchTouchEvent(MotionEvent ev) {DebugUtils.printLogD(TAG,"MyViewGroup dispatchTouchEvent.");return super.dispatchTouchEvent(ev);}@Overridepublic boolean onInterceptTouchEvent(MotionEvent ev) {DebugUtils.printLogD(TAG,"MyViewGroup onInterceptTouchEvent.");return super.onInterceptTouchEvent(ev);}@Overridepublic boolean onTouchEvent(MotionEvent ev) {boolean isConsume = super.onTouchEvent(ev);DebugUtils.printLogD(TAG,"MyViewGroup onTouchEvent. isConsume:"+isConsume);return isConsume;}
}

布局：

<?xml version="1.0" encoding="utf-8"?>
<com.example.eventdemo01.MyViewGroup xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".MainActivity">
</com.example.eventdemo01.MyViewGroup>

点击一次的打印：

// 按下
2020-12-28 14:25:33.741 7326-7326/com.example.eventdemo01 D/xtm: Activity dispatchTouchEvent.
2020-12-28 14:25:33.741 7326-7326/com.example.eventdemo01 D/xtm: MyViewGroup dispatchTouchEvent.
2020-12-28 14:25:33.741 7326-7326/com.example.eventdemo01 D/xtm: MyViewGroup onInterceptTouchEvent.
2020-12-28 14:25:33.741 7326-7326/com.example.eventdemo01 D/xtm: MyViewGroup onTouchEvent. isConsume:false
2020-12-28 14:25:33.741 7326-7326/com.example.eventdemo01 D/xtm: Activity onTouchEvent.
// 移动
2020-12-28 14:25:34.948 7326-7326/com.example.eventdemo01 D/xtm: Activity dispatchTouchEvent.
2020-12-28 14:25:34.948 7326-7326/com.example.eventdemo01 D/xtm: Activity onTouchEvent.
2020-12-28 14:25:34.963 7326-7326/com.example.eventdemo01 D/xtm: Activity dispatchTouchEvent.
2020-12-28 14:25:34.963 7326-7326/com.example.eventdemo01 D/xtm: Activity onTouchEvent.
2020-12-28 14:25:34.980 7326-7326/com.example.eventdemo01 D/xtm: Activity dispatchTouchEvent.
2020-12-28 14:25:34.980 7326-7326/com.example.eventdemo01 D/xtm: Activity onTouchEvent.
2020-12-28 14:25:35.097 7326-7326/com.example.eventdemo01 D/xtm: Activity dispatchTouchEvent.
2020-12-28 14:25:35.097 7326-7326/com.example.eventdemo01 D/xtm: Activity onTouchEvent.
// 抬起
2020-12-28 14:25:36.269 7326-7326/com.example.eventdemo01 D/xtm: Activity dispatchTouchEvent.
2020-12-28 14:25:36.269 7326-7326/com.example.eventdemo01 D/xtm: Activity onTouchEvent.

3.View事件处理

父亲布局:

package com.example.eventdemo01;import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.LinearLayout;public class MyViewGroup extends LinearLayout {private static final String TAG = "xtm";public MyViewGroup(Context context, AttributeSet attrs) {super(context, attrs);}@Overridepublic boolean dispatchTouchEvent(MotionEvent ev) {DebugUtils.printLogD(TAG,"MyViewGroup dispatchTouchEvent.");return super.dispatchTouchEvent(ev);}@Overridepublic boolean onInterceptTouchEvent(MotionEvent ev) {DebugUtils.printLogD(TAG,"MyViewGroup onInterceptTouchEvent.");return super.onInterceptTouchEvent(ev);}@Overridepublic boolean onTouchEvent(MotionEvent ev) {boolean isConsume = super.onTouchEvent(ev);DebugUtils.printLogD(TAG,"MyViewGroup onTouchEvent. isConsume:"+isConsume);return isConsume;}
}

子布局

package com.example.eventdemo01;import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.LinearLayout;import androidx.annotation.Nullable;public class MyLinearLayout extends LinearLayout {private static final String TAG = "xtm";public MyLinearLayout(Context context, @Nullable AttributeSet attrs) {super(context, attrs);}@Overridepublic boolean dispatchTouchEvent(MotionEvent ev) {DebugUtils.printLogD(TAG,"MyLinearLayout dispatchTouchEvent.");return super.dispatchTouchEvent(ev);}@Overridepublic boolean onInterceptTouchEvent(MotionEvent ev) {DebugUtils.printLogD(TAG,"MyLinearLayout onInterceptTouchEvent.");return false;}@Overridepublic boolean onTouchEvent(MotionEvent ev) {boolean isConsume = super.onTouchEvent(ev);DebugUtils.printLogD(TAG,"MyLinearLayout onTouchEvent. isConsume:"+isConsume);return isConsume;}
}

子布局嵌套一个View

package com.example.eventdemo01;import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;import androidx.annotation.Nullable;
import androidx.appcompat.widget.AppCompatImageView;public class MyImageView extends AppCompatImageView {private static final String TAG = "xtm";public MyImageView(Context context, @Nullable AttributeSet attrs) {super(context, attrs);}@Overridepublic boolean dispatchTouchEvent(MotionEvent event) {DebugUtils.printLogD(TAG,"MyImageView dispatchTouchEvent.");return super.dispatchTouchEvent(event);}@Overridepublic boolean onTouchEvent(MotionEvent event) {boolean isConsume = super.onTouchEvent(event);DebugUtils.printLogD(TAG,"MyImageView onTouchEvent. isConsume:"+isConsume);return isConsume;}}

布局：

<?xml version="1.0" encoding="utf-8"?>
<com.example.eventdemo01.MyViewGroup xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".MainActivity"><com.example.eventdemo01.MyLinearLayoutandroid:background="#00BCD4"android:orientation="vertical"android:layout_width="match_parent"android:layout_height="match_parent"><com.example.eventdemo01.MyImageViewandroid:layout_gravity="center"android:background="#f0f"android:layout_width="300dp"android:layout_height="300dp"/></com.example.eventdemo01.MyLinearLayout></com.example.eventdemo01.MyViewGroup>

按下抬起后打印：

// 按下
2020-12-28 14:28:49.661 8586-8586/com.example.eventdemo01 D/xtm: Activity dispatchTouchEvent.
2020-12-28 14:28:49.661 8586-8586/com.example.eventdemo01 D/xtm: MyViewGroup dispatchTouchEvent.
2020-12-28 14:28:49.661 8586-8586/com.example.eventdemo01 D/xtm: MyViewGroup onInterceptTouchEvent.
2020-12-28 14:28:49.661 8586-8586/com.example.eventdemo01 D/xtm: MyLinearLayout dispatchTouchEvent.
2020-12-28 14:28:49.661 8586-8586/com.example.eventdemo01 D/xtm: MyLinearLayout onInterceptTouchEvent.
2020-12-28 14:28:49.661 8586-8586/com.example.eventdemo01 D/xtm: MyImageView dispatchTouchEvent.
2020-12-28 14:28:49.661 8586-8586/com.example.eventdemo01 D/xtm: MyImageView onTouchEvent. isConsume:false
2020-12-28 14:28:49.661 8586-8586/com.example.eventdemo01 D/xtm: MyLinearLayout onTouchEvent. isConsume:false
2020-12-28 14:28:49.661 8586-8586/com.example.eventdemo01 D/xtm: MyViewGroup onTouchEvent. isConsume:false
2020-12-28 14:28:49.661 8586-8586/com.example.eventdemo01 D/xtm: Activity onTouchEvent.
// 移动
2020-12-28 14:28:50.546 8586-8586/com.example.eventdemo01 D/xtm: Activity dispatchTouchEvent.
2020-12-28 14:28:50.546 8586-8586/com.example.eventdemo01 D/xtm: Activity onTouchEvent.
2020-12-28 14:28:50.563 8586-8586/com.example.eventdemo01 D/xtm: Activity dispatchTouchEvent.
2020-12-28 14:28:50.563 8586-8586/com.example.eventdemo01 D/xtm: Activity onTouchEvent.
2020-12-28 14:28:50.580 8586-8586/com.example.eventdemo01 D/xtm: Activity dispatchTouchEvent.
2020-12-28 14:28:50.580 8586-8586/com.example.eventdemo01 D/xtm: Activity onTouchEvent.
// 抬起
2020-12-28 14:28:51.229 8586-8586/com.example.eventdemo01 D/xtm: Activity dispatchTouchEvent.
2020-12-28 14:28:51.229 8586-8586/com.example.eventdemo01 D/xtm: Activity onTouchEvent.

观察设置MyLinearLayout的onInterceptTouchEvent和onTouchEvent的不同返回值的事件传递

按下移动并抬起MyImageView:

onInterceptTouchEvent

onTouchEvent

按下

移动

抬起

false

false

dispatchTouchEvent：Activity->MyViewGroup->MyLinearLayout->MyImageView

onTouchEvent：MyImageView->MyLinearLayout->ViewGroup->Actvity

dispatchTouchEvent: Activity

onTouchEvent:Activity

同移动

false

true

dispatchTouchEvent：Activity->MyViewGroup->MyLinearLayout->MyImageView

onTouchEvent：MyImageView->MyLinearLayout

dispatchTouchEvent: Activity->MyViewGroup->MyLinearLayout

onTouchEvent:MyLinearLayout

同移动

true

false

dispatchTouchEvent：Activity->MyViewGroup->MyLinearLayout

onTouchEvent：MyLinearLayout->ViewGroup->Actvity

dispatchTouchEvent: Activity

onTouchEvent: Activity

同移动

true

true

dispatchTouchEvent：Activity->MyViewGroup->MyLinearLayout

onTouchEvent：MyLinearLayout

dispatchTouchEvent: Activity->MyViewGroup->MyLinearLayout

onTouchEvent: MyLinearLayout

同移动

从上表看出：

1.移动事件主要看onTouchEvent的返回值，true表示所有移动事件都在这里处理，不再回传给父布局处理；false表示向父布局找一个返回true的布局，若没有的话就都交给了Activity处理。

2.onInterceptTouchEvent表示事件是否向下传递。

3.onTouchEvent表示事件最终由谁处理。

已获取焦点的子ViewGroup可以通过以下方法拦截事件：

/*** Called when a child does not want this parent and its ancestors to* intercept touch events with* {@link ViewGroup#onInterceptTouchEvent(MotionEvent)}.** <p>This parent should pass this call onto its parents. This parent must obey* this request for the duration of the touch (that is, only clear the flag* after this parent has received an up or a cancel.</p>* * @param disallowIntercept True if the child does not want the parent to*            intercept touch events.*/
public void requestDisallowInterceptTouchEvent(boolean disallowIntercept);

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