Android触摸事件的分发机制
---恢复内容开始---
一、MotionEvent : ACTION_DOWN（下按事件）、ACTION_UP（松开事件）、ACTION_MOVE（移动事件）
二、三大函数
1.dispatchTouchEvent(Event event) == > 分发函数，由系统自动调用（返回值为true时，viewGroup可以向其子控件分发事件，view则分发给自身）
public boolean dispatchTouchEvent(MotionEvent ev) {
int action = ev.getAction();
switch(action){
case MotionEvent.ACTION_DOWN:
Log.e("MyLinearLayout2", "dispatchTouchEvent-->ACTION_DOWN");
break;
case MotionEvent.ACTION_MOVE:
Log.e("MyLinearLayout2","dispatchTouchEvent-->ACTION_MOVE");
break;
case MotionEvent.ACTION_UP:
Log.e("MyLinearLayout2","dispatchTouchEvent-->ACTION_UP");
break;
}
return super.dispatchTouchEvent(ev);
}
2.onInterceptTouchEvent(Event event) ==> 拦截函数（viewGroup有，view没有）
a.返回值为true时，viewGroup对象会将事件拦截，使得之后的UP和MOVE不会被任何控件相应;
b.返回值为false时，viewGroup不拦截事件，事件可以正常分发。
public boolean onInterceptTouchEvent(MotionEvent ev) {
int action = ev.getAction();
switch(action){
case MotionEvent.ACTION_DOWN:
Log.e("MyLInearLayout","onInterceptTouchEvent-->ACTION_DOWN");
break;
case MotionEvent.ACTION_MOVE:
Log.e("MyLInearLayout","onInterceptTouchEvent-->ACTION_MOVE");
break;
case MotionEvent.ACTION_UP:
Log.e("MyLInearLayout","onInterceptTouchEvent-->ACTION_UP");
break;
}
return false;
}
3.onTouchEvent(Event event) == >触摸相应函数
a.事件逐级向下传递，直到某个view或viewGroup执行onTouchEvent，若返回值为false，则会通知其父viewGroup执行onTouchEvent,若返回值为true，则不通知其父viewGroup执行onTouchEvent;
b.当某个view或viewGroup的onTouchEvent（）相应，并且返回值为true时，之后的MOVE和UP的响应事件都会直接传递给该空间，并由该控件的onTouchEvent()响应；
直接上代码：
MainActivity:
1 package com.example.qjm3662.myapplication;
2
3 import android.app.Activity;
4 import android.content.Context;
5 import android.os.Bundle;
6 import android.support.design.widget.FloatingActionButton;
7 import android.support.design.widget.Snackbar;
8 import android.support.v7.app.AppCompatActivity;
9 import android.support.v7.widget.Toolbar;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.LinearLayout;
public class MainActivity extends Activity{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
25 }
MyLInearLayout:
1 package com.example.qjm3662.myapplication;
2
3 import android.content.Context;
4 import android.util.AttributeSet;
5 import android.util.Log;
6 import android.view.MotionEvent;
7 import android.widget.LinearLayout;
8
9 /**
* Created by qjm3662 on 2016/4/10 0010.
*/
public class MyLInearLayout extends LinearLayout {
public MyLInearLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
int action = ev.getAction();
switch(action){
case MotionEvent.ACTION_DOWN:
Log.e("MyLInearLayout","dispatchTouchEvent-->ACTION_DOWN");
break;
case MotionEvent.ACTION_MOVE:
Log.e("MyLInearLayout","dispatchTouchEvent-->ACTION_MOVE");
break;
case MotionEvent.ACTION_UP:
Log.e("MyLInearLayout","dispatchTouchEvent-->ACTION_UP");
break;
}
return super.dispatchTouchEvent(ev);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
int action = event.getAction();
switch(action){
case MotionEvent.ACTION_DOWN:
Log.e("MyLInearLayout","onTouchEvent-->ACTION_DOWN");
break;
case MotionEvent.ACTION_MOVE:
Log.e("MyLInearLayout","onTouchEvent-->ACTION_MOVE");
break;
case MotionEvent.ACTION_UP:
Log.e("MyLInearLayout","onTouchEvent-->ACTION_UP");
break;
}
return false;
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
int action = ev.getAction();
switch(action){
case MotionEvent.ACTION_DOWN:
Log.e("MyLInearLayout","onInterceptTouchEvent-->ACTION_DOWN");
break;
case MotionEvent.ACTION_MOVE:
Log.e("MyLInearLayout","onInterceptTouchEvent-->ACTION_MOVE");
break;
case MotionEvent.ACTION_UP:
Log.e("MyLInearLayout","onInterceptTouchEvent-->ACTION_UP");
break;
}
return false;
}
69 }
MyLinearLayout2:
1 package com.example.qjm3662.myapplication;
2
3 import android.content.Context;
4 import android.util.AttributeSet;
5 import android.util.Log;
6 import android.view.MotionEvent;
7 import android.widget.LinearLayout;
8
9 /**
* Created by qjm3662 on 2016/4/10 0010.
*/
public class MyLinearLayout2 extends LinearLayout{
public MyLinearLayout2(Context context) {
super(context);
}
public MyLinearLayout2(Context context, AttributeSet attrs) {
super(context, attrs);
}
public MyLinearLayout2(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
int action = ev.getAction();
switch(action){
case MotionEvent.ACTION_DOWN:
Log.e("MyLinearLayout2", "dispatchTouchEvent-->ACTION_DOWN");
break;
case MotionEvent.ACTION_MOVE:
Log.e("MyLinearLayout2","dispatchTouchEvent-->ACTION_MOVE");
break;
case MotionEvent.ACTION_UP:
Log.e("MyLinearLayout2","dispatchTouchEvent-->ACTION_UP");
break;
}
return super.dispatchTouchEvent(ev);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
int action = event.getAction();
switch(action){
case MotionEvent.ACTION_DOWN:
Log.e("MyLinearLayout2","onTouchEvent-->ACTION_DOWN");
break;
case MotionEvent.ACTION_MOVE:
Log.e("MyLinearLayout2","onTouchEvent-->ACTION_MOVE");
break;
case MotionEvent.ACTION_UP:
Log.e("MyLinearLayout2","onTouchEvent-->ACTION_UP");
break;
}
return false;
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
int action = ev.getAction();
switch(action){
case MotionEvent.ACTION_DOWN:
Log.e("MyLinearLayout2","onInterceptTouchEvent-->ACTION_DOWN");
break;
case MotionEvent.ACTION_MOVE:
Log.e("MyLinearLayout2","onInterceptTouchEvent-->ACTION_MOVE");
break;
case MotionEvent.ACTION_UP:
Log.e("MyLinearLayout2","onInterceptTouchEvent-->ACTION_UP");
break;
}
return true;
}
76 }
view:
1 package com.example.qjm3662.myapplication;
2
3 import android.content.Context;
4 import android.util.AttributeSet;
5 import android.util.Log;
6 import android.view.MotionEvent;
7 import android.widget.TextView;
8
9 /**
* Created by qjm3662 on 2016/4/10 0010.
*/
public class view extends TextView{
public view(Context context) {
super(context);
}
public view(Context context, AttributeSet attrs) {
super(context, attrs);
}
public view(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
int action = ev.getAction();
switch(action){
case MotionEvent.ACTION_DOWN:
Log.e("view","dispatchTouchEvent-->ACTION_DOWN");
break;
case MotionEvent.ACTION_MOVE:
Log.e("view","dispatchTouchEvent-->ACTION_MOVE");
break;
case MotionEvent.ACTION_UP:
Log.e("view","dispatchTouchEvent-->ACTION_UP");
break;
}
return super.dispatchTouchEvent(ev);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
int action = event.getAction();
switch(action){
case MotionEvent.ACTION_DOWN:
Log.e("view","onTouchEvent-->ACTION_DOWN");
break;
case MotionEvent.ACTION_MOVE:
Log.e("view","onTouchEvent-->ACTION_MOVE");
break;
case MotionEvent.ACTION_UP:
Log.e("view","onTouchEvent-->ACTION_UP");
break;
}
return true;
}
}
view2:
1 package com.example.qjm3662.myapplication;
2
3 import android.content.Context;
4 import android.util.AttributeSet;
5 import android.util.Log;
6 import android.view.MotionEvent;
7 import android.widget.ImageView;
8
9 /**
* Created by qjm3662 on 2016/4/10 0010.
*/
public class view2 extends ImageView{
public view2(Context context) {
super(context);
}
public view2(Context context, AttributeSet attrs) {
super(context, attrs);
}
public view2(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
public boolean dispatchTouchEvent(MotionEvent event) {
int action = event.getAction();
switch(action){
case MotionEvent.ACTION_DOWN:
Log.e("view2", "dispatchTouchEvent-->ACTION_DOWN");
break;
case MotionEvent.ACTION_MOVE:
Log.e("view2","dispatchTouchEvent-->ACTION_MOVE");
break;
case MotionEvent.ACTION_UP:
Log.e("view2","dispatchTouchEvent-->ACTION_UP");
break;
}
return super.dispatchTouchEvent(event);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
int action = event.getAction();
switch(action){
case MotionEvent.ACTION_DOWN:
Log.e("view2","onTouchEvent-->ACTION_DOWN");
break;
case MotionEvent.ACTION_MOVE:
Log.e("view2","onTouchEvent-->ACTION_MOVE");
break;
case MotionEvent.ACTION_UP:
Log.e("view2","onTouchEvent-->ACTION_UP");
break;
}
return false;
}
58 }
布局：
<?xml version="1.0" encoding="utf-8"?>
<com.example.qjm3662.myapplication.MyLInearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
xmlns:android="http://schemas.android.com/apk/res/android"> <com.example.qjm3662.myapplication.view
android:text="dsvsdvsvsdv"
android:textSize="24sp"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<com.example.qjm3662.myapplication.MyLinearLayout2
android:layout_width="50dp"
android:layout_height="50dp"
android:orientation="vertical"
>
<com.example.qjm3662.myapplication.view2
android:src="@drawable/ic_launcher"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</com.example.qjm3662.myapplication.MyLinearLayout2>
</com.example.qjm3662.myapplication.MyLInearLayout>
运行结果：
点击上面的TextView后松开：
04-10 06:42:32.234 2414-2414/com.example.qjm3662.myapplication E/MyLInearLayout: dispatchTouchEvent-->ACTION_DOWN
04-10 06:42:32.234 2414-2414/com.example.qjm3662.myapplication E/MyLInearLayout: onInterceptTouchEvent-->ACTION_DOWN
04-10 06:42:32.234 2414-2414/com.example.qjm3662.myapplication E/view: dispatchTouchEvent-->ACTION_DOWN
04-10 06:42:32.234 2414-2414/com.example.qjm3662.myapplication E/view: onTouchEvent-->ACTION_DOWN
04-10 06:42:32.474 2414-2414/com.example.qjm3662.myapplication E/MyLInearLayout: dispatchTouchEvent-->ACTION_UP
04-10 06:42:32.474 2414-2414/com.example.qjm3662.myapplication E/MyLInearLayout: onInterceptTouchEvent-->ACTION_UP
04-10 06:42:32.474 2414-2414/com.example.qjm3662.myapplication E/view: dispatchTouchEvent-->ACTION_UP
04-10 06:42:32.474 2414-2414/com.example.qjm3662.myapplication E/view: onTouchEvent-->ACTION_UP
点击下面的ImagView后松开：
04-10 06:43:58.322 2414-2414/com.example.qjm3662.myapplication E/MyLInearLayout: dispatchTouchEvent-->ACTION_DOWN
04-10 06:43:58.322 2414-2414/com.example.qjm3662.myapplication E/MyLInearLayout: onInterceptTouchEvent-->ACTION_DOWN
04-10 06:43:58.322 2414-2414/com.example.qjm3662.myapplication E/MyLinearLayout2: dispatchTouchEvent-->ACTION_DOWN
04-10 06:43:58.322 2414-2414/com.example.qjm3662.myapplication E/MyLinearLayout2: onInterceptTouchEvent-->ACTION_DOWN
04-10 06:43:58.322 2414-2414/com.example.qjm3662.myapplication E/MyLinearLayout2: onTouchEvent-->ACTION_DOWN
04-10 06:43:58.322 2414-2414/com.example.qjm3662.myapplication E/MyLInearLayout: onTouchEvent-->ACTION_DOWN
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