Android事件传递机制详解
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总结
dispatchTouchEvent方法：分发点击事件
onInterceptTouchEvent方法：拦截事件(只存在于ViewGroup，View没有此方法)， 在dispatchTouchEvent方法内部调用
onTouchEvent方法：处理点击事件，在dispatchTouchEvent方法内部调用
示例代码
自定义View-MyLinearLayout
public class MyLinearLayout extends LinearLayout { private static String TAG = "test"; public MyLinearLayout(Context context) { this(context,null); } public MyLinearLayout(Context context, @Nullable AttributeSet attrs) { this(context, attrs, 0); } public MyLinearLayout(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); initView(context); } private void initView(Context context) { } @Override public boolean dispatchTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: Log.d(TAG, "MyLinearLayout-dispatchTouchEvent-down"); break; case MotionEvent.ACTION_MOVE: Log.d(TAG, "MyLinearLayout-dispatchTouchEvent-move"); break; case MotionEvent.ACTION_UP: Log.d(TAG, "MyLinearLayout-dispatchTouchEvent-up"); break; case MotionEvent.ACTION_CANCEL: Log.d(TAG, "MyLinearLayout-dispatchTouchEvent-cancel"); break; } return super.dispatchTouchEvent(event); } @Override public boolean onInterceptTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: Log.d(TAG, "MyLinearLayout-onInterceptTouchEvent-down"); break; case MotionEvent.ACTION_MOVE: Log.d(TAG, "MyLinearLayout-onInterceptTouchEvent-move"); break; case MotionEvent.ACTION_UP: Log.d(TAG, "MyLinearLayout-onInterceptTouchEvent-up"); break; case MotionEvent.ACTION_CANCEL: Log.d(TAG, "MyLinearLayout-onInterceptTouchEvent-cancel"); break; } return super.onInterceptTouchEvent(event); } @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: Log.d(TAG, "MyLinearLayout-onTouchEvent-down"); break; case MotionEvent.ACTION_MOVE: Log.d(TAG, "MyLinearLayout-onTouchEvent-move"); break; case MotionEvent.ACTION_UP: Log.d(TAG, "MyLinearLayout-onTouchEvent-up"); break; case MotionEvent.ACTION_CANCEL: Log.d(TAG, "MyLinearLayout-onTouchEvent-cancel"); break; } return super.onTouchEvent(event); }}自定义View-MyButton
public class MyButton extends android.support.v7.widget.AppCompatButton { private static String TAG = "test"; public MyButton(Context context) { this(context, null); } public MyButton(Context context, AttributeSet attrs) { this(context, attrs, 0); } public MyButton(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); initView(context); } private void initView(Context context) { } @Override public boolean dispatchTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: Log.d(TAG, "MyButton-dispatchTouchEvent-down"); break; case MotionEvent.ACTION_MOVE: Log.d(TAG, "MyButton-dispatchTouchEvent-move"); break; case MotionEvent.ACTION_UP: Log.d(TAG, "MyButton-dispatchTouchEvent-up"); break; case MotionEvent.ACTION_CANCEL: Log.d(TAG, "MyButton-dispatchTouchEvent-cancel"); break; } return super.dispatchTouchEvent(event); } @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: Log.d(TAG, "MyButton-onTouchEvent-down"); break; case MotionEvent.ACTION_MOVE: Log.d(TAG, "MyButton-onTouchEvent-move"); break; case MotionEvent.ACTION_UP: Log.d(TAG, "MyButton-onTouchEvent-up"); break; case MotionEvent.ACTION_CANCEL: Log.d(TAG, "MyButton-onTouchEvent-cancel"); break; } return super.onTouchEvent(event); }}MainActivity
public class TestActivity extends AppCompatActivity { private MyLinearLayout mLlRoot; private MyButton mBtn1; private static String TAG = "test"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_three); initView(); } private void initView() { mLlRoot = (MyLinearLayout) findViewById(R.id.ll_root); mBtn1 = (MyButton) findViewById(R.id.btn1); } @Override public boolean dispatchTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: Log.d(TAG, "Activity-dispatchTouchEvent-down"); break; case MotionEvent.ACTION_MOVE: Log.d(TAG, "Activity-dispatchTouchEvent-move"); break; case MotionEvent.ACTION_UP: Log.d(TAG, "Activity-dispatchTouchEvent-up"); break; case MotionEvent.ACTION_CANCEL: Log.d(TAG, "threeActivity-dispatchTouchEvent-cancel"); break; } return super.dispatchTouchEvent(event); } @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: Log.d(TAG, "Activity-onTouchEvent-down"); break; case MotionEvent.ACTION_MOVE: Log.d(TAG, "Activity-onTouchEvent-move"); break; case MotionEvent.ACTION_UP: Log.d(TAG, "Activity-onTouchEvent-up"); break; case MotionEvent.ACTION_CANCEL: Log.d(TAG, "Activity-onTouchEvent-cancel"); break; } return super.onTouchEvent(event); }}布局文件
<?xml version="1.0" encoding="utf-8"?><LinearLayout 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"> <com.cn.liuyz.javademo.autoView.MyLinearLayout android:id="@+id/ll_root" android:layout_width="match_parent" android:orientation="horizontal" android:background="#888" android:layout_height="500dp"> <com.cn.liuyz.javademo.autoView.MyButton android:id="@+id/btn1" android:text="你好" android:background="#f00" android:layout_width="200dp" android:layout_gravity="center" android:layout_height="200dp"/> </com.cn.liuyz.javademo.autoView.MyLinearLayout></LinearLayout>默认情况下事件传递
从Activity –> ViewGroup(MyLinearLayout) –> View(MyButton)，从上往下调用dispatchTouchEvent()
再由View(MyButton) –> ViewGroup(MyLinearLayout) –> Activity，从下往上调用onTouchEvent()
ViewGroup中
dispatchTouchEvent
dispatchTouchEvent返回super.dispatchTouchEvent(event)
- 调用dispatchTouchEvent方法内部的onInterceptTouchEvent方法
dispatchTouchEvent返回true
- 消费事件，事件不会往下传递
- dispatchTouchEvent后续的ACTION_MOVE、ACTION_UP事件继续执行(后续事件会继续分发到该ViewGroup)
dispatchTouchEvent返回false
- 不消费事件，事件停止传递
- 将事件向上传给父控件的onTouchEvent处理
- dispatchTouchEvent后续的ACTION_MOVE、ACTION_UP事件不再执行(后续事件将不会分发给该ViewGroup)
onInterceptTouchEvent
onInterceptTouchEvent返回super.onInterceptTouchEvent(event)
- 不拦截事件，事件继续往下传递
- onInterceptTouchEvent后续的ACTION_MOVE、ACTION_UP事件不再执行
- 同一个事件序列中同一个ViewGroup的onInterceptTouchEvent方法只会调用一次
onInterceptTouchEvent返回true
- 拦截事件，事件不会往下传递
- 传递给自己的onTouchEvent处理
- onInterceptTouchEvent后续的ACTION_MOVE、ACTION_UP事件不再执行
onInterceptTouchEvent返回false
- 不拦截事件，事件继续往下传递
- onInterceptTouchEvent后续的ACTION_MOVE、ACTION_UP事件不再执行
- ViewGroup默认是不拦截的，所以super==false
onTouchEvent
onTouchEvent返回super.onTouchEvent(event)
- 不消费事件，事件继续往上传递
- onTouchEvent后续的ACTION_MOVE、ACTION_UP事件不再执行(后续事件将不会分发给该ViewGroup)
onTouchEvent返回true
- 处理事件，事件停止传递
- onTouchEvent后续的ACTION_MOVE、ACTION_UP事件继续执行(后续事件会继续分发到该ViewGroup)
onTouchEvent返回false
- 不处理事件，传递给父控件onTouchEvent处理
- onTouchEvent后续的ACTION_MOVE、ACTION_UP事件不再执行(后续事件将不会分发给该ViewGroup)
View中
dispatchTouchEvent
dispatchTouchEvent返回super.dispatchTouchEvent(event)
- 调用dispatchTouchEvent方法内部的onTouchEvent方法
- 是否消费事件取决于onTouchEvent的返回值
dispatchTouchEvent返回true
- 消费事件，事件不会往下传递
- dispatchTouchEvent后续的ACTION_MOVE、ACTION_UP事件继续执行(后续事件会继续分发到该ViewGroup)
dispatchTouchEvent返回false
- 不消费事件
- 将事件向上传给父控件的onTouchEvent处理
- dispatchTouchEvent后续的ACTION_MOVE、ACTION_UP事件不再执行(后续事件将不会分发给该ViewGroup)
onTouchEvent
onTouchEvent返回super.onTouchEvent(event)
- 不处理事件，事件继续往上传递
- onTouchEvent后续的ACTION_MOVE、ACTION_UP事件不再执行
onTouchEvent返回true
- 处理事件，事件停止传递
- onTouchEvent后续的ACTION_MOVE、ACTION_UP事件继续执行(后续事件会继续分发到该ViewGroup)
onTouchEvent返回false
- 不处理事件
- 将事件向上传给父控件的onTouchEvent处理
- onTouchEvent后续的ACTION_MOVE、ACTION_UP事件不再执行(后续事件将不会分发给该ViewGroup)
- View的默认实现是不处理事件。所以super.onTouchEvent(event)==false
注意
- ViewGroup和View的dispatchTouchEvent和onTouchEvent方法 return false的时候事件都会向上传给父控件的onTouchEvent处理
- ViewGroup的onInterceptTouchEvent 默认是不拦截的，所以return super.onInterceptTouchEvent()和return false一样
- View的onTouchEvent默认是不处理事件。所以super.onTouchEvent(event)和false一样
- ViewGroup要想把事件分发给自己的onTouchEvent，只有返回super.dispatchTouchEvent(event)，调用内部onInterceptTouchEvent方法并return true，才会调用自己的onTouchEvent方法。其他方法都不行
- View要想把事件分发给自己的onTouchEvent，只有返回super.dispatchTouchEvent(event)，才会调用自己的onTouchEvent方法，其他方法都不行
示例结果分析
全是默认返回值，点击一下
11-14 16:06:18.787 29278-29278/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-down11-14 16:06:18.788 29278-29278/com.cn.liuyz.javademo D/test: MyLinearLayout-dispatchTouchEvent-down11-14 16:06:18.788 29278-29278/com.cn.liuyz.javademo D/test: MyLinearLayout-onInterceptTouchEvent-down11-14 16:06:18.788 29278-29278/com.cn.liuyz.javademo D/test: MyButton-dispatchTouchEvent-down11-14 16:06:18.788 29278-29278/com.cn.liuyz.javademo D/test: MyButton-onTouchEvent-down11-14 16:06:18.788 29278-29278/com.cn.liuyz.javademo D/test: MyLinearLayout-onTouchEvent-down11-14 16:06:18.791 29278-29278/com.cn.liuyz.javademo D/test: Activity-onTouchEvent-down11-14 16:06:18.844 29278-29278/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-move11-14 16:06:18.844 29278-29278/com.cn.liuyz.javademo D/test: Activity-onTouchEvent-move11-14 16:06:18.861 29278-29278/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-move11-14 16:06:18.861 29278-29278/com.cn.liuyz.javademo D/test: Activity-onTouchEvent-move11-14 16:06:18.944 29278-29278/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-up11-14 16:06:18.944 29278-29278/com.cn.liuyz.javademo D/test: Activity-onTouchEvent-up默认情况下事件传递
从Activity –> ViewGroup(MyLinearLayout) –> View(MyButton)，从上往下调用dispatchTouchEvent()
再由View(MyButton) –> ViewGroup(MyLinearLayout) –> Activity，从下往上调用onTouchEvent()
注意
同一个事件序列中同一个ViewGroup的onInterceptTouchEvent方法只会调用一次
1、如果在MyLinearLayout的dispatchTouchEvent中返回true
11-14 16:30:44.311 32234-32234/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-down11-14 16:30:44.312 32234-32234/com.cn.liuyz.javademo D/test: MyLinearLayout-dispatchTouchEvent-down11-14 16:30:44.351 32234-32234/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-move11-14 16:30:44.351 32234-32234/com.cn.liuyz.javademo D/test: MyLinearLayout-dispatchTouchEvent-move11-14 16:30:44.368 32234-32234/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-move11-14 16:30:44.368 32234-32234/com.cn.liuyz.javademo D/test: MyLinearLayout-dispatchTouchEvent-move11-14 16:30:44.384 32234-32234/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-move11-14 16:30:44.384 32234-32234/com.cn.liuyz.javademo D/test: MyLinearLayout-dispatchTouchEvent-move11-14 16:30:44.441 32234-32234/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-up11-14 16:30:44.441 32234-32234/com.cn.liuyz.javademo D/test: MyLinearLayout-dispatchTouchEvent-up- 消费事件，事件不会往下传递
- dispatchTouchEvent的ACTION_MOVE、ACTION_UP事件继续执行(后续事件会继续分发到该ViewGroup)
2、如果在MyLinearLayout的dispatchTouchEvent中返回false
11-14 16:32:42.088 32717-32717/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-down11-14 16:32:42.089 32717-32717/com.cn.liuyz.javademo D/test: MyLinearLayout-dispatchTouchEvent-down11-14 16:32:42.092 32717-32717/com.cn.liuyz.javademo D/test: Activity-onTouchEvent-down11-14 16:32:42.136 32717-32717/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-move11-14 16:32:42.136 32717-32717/com.cn.liuyz.javademo D/test: Activity-onTouchEvent-move11-14 16:32:42.152 32717-32717/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-move11-14 16:32:42.152 32717-32717/com.cn.liuyz.javademo D/test: Activity-onTouchEvent-move11-14 16:32:42.169 32717-32717/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-move11-14 16:32:42.169 32717-32717/com.cn.liuyz.javademo D/test: Activity-onTouchEvent-move11-14 16:32:42.201 32717-32717/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-up11-14 16:32:42.201 32717-32717/com.cn.liuyz.javademo D/test: Activity-onTouchEvent-up- 不消费事件，事件停止传递
- 将事件向上传给父控件的onTouchEvent处理
- dispatchTouchEvent的ACTION_MOVE、ACTION_UP事件不再执行(后续事件将不会分发给该ViewGroup)
3、如果在MyLinearLayout的onInterceptTouchEvent中返回true
11-14 16:36:09.430 880-880/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-down11-14 16:36:09.431 880-880/com.cn.liuyz.javademo D/test: MyLinearLayout-dispatchTouchEvent-down11-14 16:36:09.431 880-880/com.cn.liuyz.javademo D/test: MyLinearLayout-onInterceptTouchEvent-down11-14 16:36:09.431 880-880/com.cn.liuyz.javademo D/test: MyLinearLayout-onTouchEvent-down11-14 16:36:09.437 880-880/com.cn.liuyz.javademo D/test: Activity-onTouchEvent-down11-14 16:36:09.519 880-880/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-move11-14 16:36:09.520 880-880/com.cn.liuyz.javademo D/test: Activity-onTouchEvent-move11-14 16:36:09.526 880-880/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-move11-14 16:36:09.527 880-880/com.cn.liuyz.javademo D/test: Activity-onTouchEvent-move11-14 16:36:09.528 880-880/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-up11-14 16:36:09.528 880-880/com.cn.liuyz.javademo D/test: Activity-onTouchEvent-up- 不拦截事件，事件继续往下传递
- onInterceptTouchEvent的ACTION_MOVE、ACTION_UP事件不再执行
- 同一个事件序列中同一个ViewGroup的onInterceptTouchEvent方法只会调用一次
4、如果在MyLinearLayout的onInterceptTouchEvent中返回true、onTouchEvent中返回true
11-14 16:41:08.186 1143-1143/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-down11-14 16:41:08.188 1143-1143/com.cn.liuyz.javademo D/test: MyLinearLayout-dispatchTouchEvent-down11-14 16:41:08.188 1143-1143/com.cn.liuyz.javademo D/test: MyLinearLayout-onInterceptTouchEvent-down11-14 16:41:08.189 1143-1143/com.cn.liuyz.javademo D/test: MyLinearLayout-onTouchEvent-down11-14 16:41:08.259 1143-1143/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-move11-14 16:41:08.259 1143-1143/com.cn.liuyz.javademo D/test: MyLinearLayout-dispatchTouchEvent-move11-14 16:41:08.259 1143-1143/com.cn.liuyz.javademo D/test: MyLinearLayout-onTouchEvent-move11-14 16:41:08.276 1143-1143/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-move11-14 16:41:08.276 1143-1143/com.cn.liuyz.javademo D/test: MyLinearLayout-dispatchTouchEvent-move11-14 16:41:08.276 1143-1143/com.cn.liuyz.javademo D/test: MyLinearLayout-onTouchEvent-move11-14 16:41:08.292 1143-1143/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-move11-14 16:41:08.292 1143-1143/com.cn.liuyz.javademo D/test: MyLinearLayout-dispatchTouchEvent-move11-14 16:41:08.293 1143-1143/com.cn.liuyz.javademo D/test: MyLinearLayout-onTouchEvent-move11-14 16:41:08.343 1143-1143/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-up11-14 16:41:08.343 1143-1143/com.cn.liuyz.javademo D/test: MyLinearLayout-dispatchTouchEvent-up11-14 16:41:08.343 1143-1143/com.cn.liuyz.javademo D/test: MyLinearLayout-onTouchEvent-up- 不拦截事件，事件继续往下传递
- onInterceptTouchEvent的ACTION_MOVE、ACTION_UP事件不再执行
- 同一个事件序列中同一个ViewGroup的onInterceptTouchEvent方法只会调用一次
注意
ViewGroup 想把事件分发给自己的onTouchEvent，需要拦截器onInterceptTouchEvent方法return true 把事件拦截下来。
5、如果在MyLinearLayout的onInterceptTouchEvent中返回false
11-14 16:44:38.127 1534-1534/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-down11-14 16:44:38.127 1534-1534/com.cn.liuyz.javademo D/test: MyLinearLayout-dispatchTouchEvent-down11-14 16:44:38.127 1534-1534/com.cn.liuyz.javademo D/test: MyLinearLayout-onInterceptTouchEvent-down11-14 16:44:38.127 1534-1534/com.cn.liuyz.javademo D/test: MyButton-dispatchTouchEvent-down11-14 16:44:38.128 1534-1534/com.cn.liuyz.javademo D/test: MyButton-onTouchEvent-down11-14 16:44:38.128 1534-1534/com.cn.liuyz.javademo D/test: MyLinearLayout-onTouchEvent-down11-14 16:44:38.129 1534-1534/com.cn.liuyz.javademo D/test: Activity-onTouchEvent-down11-14 16:44:38.182 1534-1534/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-move11-14 16:44:38.182 1534-1534/com.cn.liuyz.javademo D/test: Activity-onTouchEvent-move11-14 16:44:38.199 1534-1534/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-move11-14 16:44:38.199 1534-1534/com.cn.liuyz.javademo D/test: Activity-onTouchEvent-move11-14 16:44:38.223 1534-1534/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-up11-14 16:44:38.224 1534-1534/com.cn.liuyz.javademo D/test: Activity-onTouchEvent-up- 拦截事件，事件不会往下传递
- 传递给自己的onTouchEvent处理
- onInterceptTouchEvent的ACTION_MOVE、ACTION_UP事件不再执行
注意
ViewGroup的拦截器onInterceptTouchEvent 默认是不拦截的，所以return super.onInterceptTouchEvent()=return false
6、如果在MyLinearLayout的onTouchEvent中返回true
11-14 16:46:08.074 1884-1884/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-down11-14 16:46:08.075 1884-1884/com.cn.liuyz.javademo D/test: MyLinearLayout-dispatchTouchEvent-down11-14 16:46:08.075 1884-1884/com.cn.liuyz.javademo D/test: MyLinearLayout-onInterceptTouchEvent-down11-14 16:46:08.075 1884-1884/com.cn.liuyz.javademo D/test: MyButton-dispatchTouchEvent-down11-14 16:46:08.076 1884-1884/com.cn.liuyz.javademo D/test: MyButton-onTouchEvent-down11-14 16:46:08.076 1884-1884/com.cn.liuyz.javademo D/test: MyLinearLayout-onTouchEvent-down11-14 16:46:08.140 1884-1884/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-move11-14 16:46:08.141 1884-1884/com.cn.liuyz.javademo D/test: MyLinearLayout-dispatchTouchEvent-move11-14 16:46:08.141 1884-1884/com.cn.liuyz.javademo D/test: MyLinearLayout-onTouchEvent-move11-14 16:46:08.157 1884-1884/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-move11-14 16:46:08.157 1884-1884/com.cn.liuyz.javademo D/test: MyLinearLayout-dispatchTouchEvent-move11-14 16:46:08.157 1884-1884/com.cn.liuyz.javademo D/test: MyLinearLayout-onTouchEvent-move11-14 16:46:08.174 1884-1884/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-move11-14 16:46:08.174 1884-1884/com.cn.liuyz.javademo D/test: MyLinearLayout-dispatchTouchEvent-move11-14 16:46:08.174 1884-1884/com.cn.liuyz.javademo D/test: MyLinearLayout-onTouchEvent-move11-14 16:46:08.241 1884-1884/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-up11-14 16:46:08.241 1884-1884/com.cn.liuyz.javademo D/test: MyLinearLayout-dispatchTouchEvent-up11-14 16:46:08.241 1884-1884/com.cn.liuyz.javademo D/test: MyLinearLayout-onTouchEvent-up- 不消费事件，事件继续往上传递
- onTouchEvent后续的ACTION_MOVE、ACTION_UP事件不再执行(后续事件会继续分发到该ViewGroup)
7、如果在MyLinearLayout的onTouchEvent中返回false
11-14 16:48:34.671 2190-2190/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-down11-14 16:48:34.672 2190-2190/com.cn.liuyz.javademo D/test: MyLinearLayout-dispatchTouchEvent-down11-14 16:48:34.672 2190-2190/com.cn.liuyz.javademo D/test: MyLinearLayout-onInterceptTouchEvent-down11-14 16:48:34.672 2190-2190/com.cn.liuyz.javademo D/test: MyButton-dispatchTouchEvent-down11-14 16:48:34.673 2190-2190/com.cn.liuyz.javademo D/test: MyButton-onTouchEvent-down11-14 16:48:34.674 2190-2190/com.cn.liuyz.javademo D/test: MyLinearLayout-onTouchEvent-down11-14 16:48:34.676 2190-2190/com.cn.liuyz.javademo D/test: Activity-onTouchEvent-down11-14 16:48:34.785 2190-2190/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-move11-14 16:48:34.785 2190-2190/com.cn.liuyz.javademo D/test: Activity-onTouchEvent-move11-14 16:48:34.802 2190-2190/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-move11-14 16:48:34.802 2190-2190/com.cn.liuyz.javademo D/test: Activity-onTouchEvent-move11-14 16:48:34.819 2190-2190/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-move11-14 16:48:34.820 2190-2190/com.cn.liuyz.javademo D/test: Activity-onTouchEvent-move11-14 16:48:34.867 2190-2190/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-up11-14 16:48:34.867 2190-2190/com.cn.liuyz.javademo D/test: Activity-onTouchEvent-up- 不处理事件，传递给父控件onTouchEvent处理
- onTouchEvent的ACTION_MOVE、ACTION_UP事件不再执行(后续事件将不会分发给该ViewGroup)
8、如果在MyButton的dispatchTouchEvent中返回true
11-14 16:50:14.361 2408-2408/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-down11-14 16:50:14.361 2408-2408/com.cn.liuyz.javademo D/test: MyLinearLayout-dispatchTouchEvent-down11-14 16:50:14.362 2408-2408/com.cn.liuyz.javademo D/test: MyLinearLayout-onInterceptTouchEvent-down11-14 16:50:14.362 2408-2408/com.cn.liuyz.javademo D/test: MyButton-dispatchTouchEvent-down11-14 16:50:14.458 2408-2408/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-move11-14 16:50:14.458 2408-2408/com.cn.liuyz.javademo D/test: MyLinearLayout-dispatchTouchEvent-move11-14 16:50:14.458 2408-2408/com.cn.liuyz.javademo D/test: MyLinearLayout-onInterceptTouchEvent-move11-14 16:50:14.458 2408-2408/com.cn.liuyz.javademo D/test: MyButton-dispatchTouchEvent-move11-14 16:50:14.474 2408-2408/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-move11-14 16:50:14.474 2408-2408/com.cn.liuyz.javademo D/test: MyLinearLayout-dispatchTouchEvent-move11-14 16:50:14.474 2408-2408/com.cn.liuyz.javademo D/test: MyLinearLayout-onInterceptTouchEvent-move11-14 16:50:14.475 2408-2408/com.cn.liuyz.javademo D/test: MyButton-dispatchTouchEvent-move11-14 16:50:14.491 2408-2408/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-move11-14 16:50:14.491 2408-2408/com.cn.liuyz.javademo D/test: MyLinearLayout-dispatchTouchEvent-move11-14 16:50:14.491 2408-2408/com.cn.liuyz.javademo D/test: MyLinearLayout-onInterceptTouchEvent-move11-14 16:50:14.491 2408-2408/com.cn.liuyz.javademo D/test: MyButton-dispatchTouchEvent-move11-14 16:50:14.549 2408-2408/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-up11-14 16:50:14.549 2408-2408/com.cn.liuyz.javademo D/test: MyLinearLayout-dispatchTouchEvent-up11-14 16:50:14.549 2408-2408/com.cn.liuyz.javademo D/test: MyLinearLayout-onInterceptTouchEvent-up11-14 16:50:14.549 2408-2408/com.cn.liuyz.javademo D/test: MyButton-dispatchTouchEvent-up- 消费事件，事件不会往下传递
- dispatchTouchEvent的ACTION_MOVE、ACTION_UP事件继续执行(后续事件会继续分发到该View)
9、如果在MyButton的dispatchTouchEvent中返回false
11-14 16:53:13.553 2734-2734/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-down11-14 16:53:13.554 2734-2734/com.cn.liuyz.javademo D/test: MyLinearLayout-dispatchTouchEvent-down11-14 16:53:13.555 2734-2734/com.cn.liuyz.javademo D/test: MyLinearLayout-onInterceptTouchEvent-down11-14 16:53:13.555 2734-2734/com.cn.liuyz.javademo D/test: MyButton-dispatchTouchEvent-down11-14 16:53:13.555 2734-2734/com.cn.liuyz.javademo D/test: MyLinearLayout-onTouchEvent-down11-14 16:53:13.558 2734-2734/com.cn.liuyz.javademo D/test: Activity-onTouchEvent-down11-14 16:53:13.726 2734-2734/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-move11-14 16:53:13.726 2734-2734/com.cn.liuyz.javademo D/test: Activity-onTouchEvent-move11-14 16:53:13.733 2734-2734/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-move11-14 16:53:13.733 2734-2734/com.cn.liuyz.javademo D/test: Activity-onTouchEvent-move11-14 16:53:13.734 2734-2734/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-up11-14 16:53:13.734 2734-2734/com.cn.liuyz.javademo D/test: Activity-onTouchEvent-up- 不消费事件
- 将事件向上传给父控件的onTouchEvent处理
- dispatchTouchEvent的ACTION_MOVE、ACTION_UP事件不再执行(后续事件将不会分发给该View)
注意
View 没有拦截器，为了让View可以把事件分发给自己的onTouchEvent，View的dispatchTouchEvent默认实现（super）就是把事件分发给自己的onTouchEvent
10、如果在MyButton的onTouchEvent中返回true
11-14 16:55:08.718 2992-2992/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-down11-14 16:55:08.718 2992-2992/com.cn.liuyz.javademo D/test: MyLinearLayout-dispatchTouchEvent-down11-14 16:55:08.720 2992-2992/com.cn.liuyz.javademo D/test: MyLinearLayout-onInterceptTouchEvent-down11-14 16:55:08.720 2992-2992/com.cn.liuyz.javademo D/test: MyButton-dispatchTouchEvent-down11-14 16:55:08.720 2992-2992/com.cn.liuyz.javademo D/test: MyButton-onTouchEvent-down11-14 16:55:08.807 2992-2992/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-move11-14 16:55:08.807 2992-2992/com.cn.liuyz.javademo D/test: MyLinearLayout-dispatchTouchEvent-move11-14 16:55:08.807 2992-2992/com.cn.liuyz.javademo D/test: MyLinearLayout-onInterceptTouchEvent-move11-14 16:55:08.807 2992-2992/com.cn.liuyz.javademo D/test: MyButton-dispatchTouchEvent-move11-14 16:55:08.807 2992-2992/com.cn.liuyz.javademo D/test: MyButton-onTouchEvent-move11-14 16:55:08.823 2992-2992/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-move11-14 16:55:08.823 2992-2992/com.cn.liuyz.javademo D/test: MyLinearLayout-dispatchTouchEvent-move11-14 16:55:08.823 2992-2992/com.cn.liuyz.javademo D/test: MyLinearLayout-onInterceptTouchEvent-move11-14 16:55:08.823 2992-2992/com.cn.liuyz.javademo D/test: MyButton-dispatchTouchEvent-move11-14 16:55:08.824 2992-2992/com.cn.liuyz.javademo D/test: MyButton-onTouchEvent-move11-14 16:55:08.867 2992-2992/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-up11-14 16:55:08.867 2992-2992/com.cn.liuyz.javademo D/test: MyLinearLayout-dispatchTouchEvent-up11-14 16:55:08.867 2992-2992/com.cn.liuyz.javademo D/test: MyLinearLayout-onInterceptTouchEvent-up11-14 16:55:08.867 2992-2992/com.cn.liuyz.javademo D/test: MyButton-dispatchTouchEvent-up11-14 16:55:08.867 2992-2992/com.cn.liuyz.javademo D/test: MyButton-onTouchEvent-up- 处理事件，事件停止传递
- onTouchEvent后续的ACTION_MOVE、ACTION_UP事件继续执行(后续事件会继续分发到该ViewGroup)
11、如果在MyButton的onTouchEvent中返回false
11-14 16:56:37.628 3205-3205/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-down11-14 16:56:37.628 3205-3205/com.cn.liuyz.javademo D/test: MyLinearLayout-dispatchTouchEvent-down11-14 16:56:37.628 3205-3205/com.cn.liuyz.javademo D/test: MyLinearLayout-onInterceptTouchEvent-down11-14 16:56:37.629 3205-3205/com.cn.liuyz.javademo D/test: MyButton-dispatchTouchEvent-down11-14 16:56:37.629 3205-3205/com.cn.liuyz.javademo D/test: MyButton-onTouchEvent-down11-14 16:56:37.629 3205-3205/com.cn.liuyz.javademo D/test: MyLinearLayout-onTouchEvent-down11-14 16:56:37.631 3205-3205/com.cn.liuyz.javademo D/test: Activity-onTouchEvent-down11-14 16:56:37.718 3205-3205/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-move11-14 16:56:37.718 3205-3205/com.cn.liuyz.javademo D/test: Activity-onTouchEvent-move11-14 16:56:37.735 3205-3205/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-move11-14 16:56:37.735 3205-3205/com.cn.liuyz.javademo D/test: Activity-onTouchEvent-move11-14 16:56:37.784 3205-3205/com.cn.liuyz.javademo D/test: Activity-dispatchTouchEvent-up11-14 16:56:37.784 3205-3205/com.cn.liuyz.javademo D/test: Activity-onTouchEvent-up- 不处理事件
- 将事件向上传给父控件的onTouchEvent处理
- onTouchEvent后续的ACTION_MOVE、ACTION_UP事件不再执行(后续事件将不会分发给该ViewGroup)
- View的默认实现是不消费的。所以super==false
onTouch和onTouchEvent区别和使用
这两个方法都是在View的dispatchTouchEvent中调用，onTouch优先于onTouchEvent执行。如果在onTouch方法中通过返回true将事件消费掉，onTouchEvent将不会执行。
onTouch能执行需要两个条件，第一mOnTouchListener值不能为空，第二当前点击的控件必须是enable。因此如果控件是非enable的，那么给它注册onTouch事件将永远得不到执行。对于这一类控件，如果我们想要监听它的touch事件，就必须通过在该控件中重写onTouchEvent方法来实现。
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