在 Android 中同时处理多个视图上的触摸事件

使用回调很容易实现。只需使用您需要的任何方法创建一个接口，然后在 Viewpager 中实现即可。Call 将根据您的触摸事件在 View 类中调用，响应将到达 Viewpager。我在我的 MainActivity 中创建了一个带有 ImageView 的示例，并调用以从不同的片段更改其大小，并且它可以工作。这是我的代码如下：

public interface ICallBackForResize {
   void resizeme();
   void actionUp();
   void actionDown();

 }

主要活动：

public class MainActivity extends AppCompatActivity implements ICallBackForResize {

ImageView img;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    img= (ImageView) findViewById(R.id.image);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

@Override
public void resizeme() {
    Toast.makeText(MainActivity.this,"called",Toast.LENGTH_LONG).show();
    img.getLayoutParams().height += 20;
    img.getLayoutParams().width += 20;
    img.requestLayout();
}

@Override
public void actionUp() {
    //do whatever
}

@Override
public void actionDown() {
    //do whatever

}
 }

带有简单按钮的 My Fragment 类：

public class MyFragmentButton extends Fragment {
View view;
ICallBackForResize callBackForResize;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    callBackForResize= (ICallBackForResize) getActivity();
}

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    view=inflater.inflate(R.layout.mybutton,container,false);
    Button btn= (Button) view.findViewById(R.id.button);
    btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            callBackForResize.resizeme();
        }
    });
    return view;
}
}

我相信你不需要xml文件。如果有人需要，我刚刚分享了：

activity_main：

<?xml version="1.0" encoding="utf-8"?>

<android.support.design.widget.AppBarLayout
    android:layout_height="wrap_content"
    android:layout_width="match_parent"
    android:theme="@style/AppTheme.AppBarOverlay">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        app:popupTheme="@style/AppTheme.PopupOverlay" />

</android.support.design.widget.AppBarLayout>

<include layout="@layout/content_main"/>


 </android.support.design.widget.CoordinatorLayout>

content_main：

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:showIn="@layout/activity_main"
tools:context="nanofaroque.com.addlistener.MainActivity">

<ImageView
    android:id="@+id/image"
    android:text="Hello World!"
    android:layout_width="100dp"
    android:layout_gravity="center"
    android:src="@mipmap/ic_launcher"
    android:layout_height="100dp" />


<fragment
    android:name="nanofaroque.com.addlistener.MyFragmentButton"
    android:id="@+id/headlines_fragment"
    android:layout_width="100dp"
    android:layout_height="100dp" />

 </FrameLayout>

我的按钮：

 <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
    android:id="@+id/button"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

 </LinearLayout>

如果我没记错的话，您希望在顶部和底部视图上处理相同的触摸事件。根据 Android 触摸架构，您无法同时处理来自多个视图的触摸事件。您必须在方法中处理它或传递到下一个视图。您还需要等到顶视图处理完 ），然后让子视图进行处理。onTouchEvent()MotionEvent(

这是使用 RxAndroid 方法的可能解决方案，

在画布视图的 ，MotionEvent()

@Override
    public boolean onTouchEvent(MotionEvent event) {

    // process all touch events (UP/DOWN/MOVE)

    //send events as observable
    RxBus.getInstance().sendMotionEvent(event);

    return true;
}

这将观察运动事件并通知所有观察者。

现在，在视图寻呼器中订阅运动事件，以便每当从画布进行更改时，它都会立即传递事件。onResume()

Subscription RxBus _rxBus = RxBus.getInstance();
        subscription = _rxBus.getMotionEvent()
                .subscribe(new Action1<MotionEvent>() {
                    @Override
                    public void call(MotionEvent event) {
                       // call the onTouchEvent of your widget e.g. ImageView and pass the received event
                       // this will apply the same touch event that was applied in the canvas 

                        // .onTouchEvent(event) is important to override the onTouchEvent() of your widget that will use the touch event
                        imageView.onTouchEvent(event);
                    }
            });

下面给出了 RxBus 类，

public class RxBus {

    private static RxBus instance;

    private final PublishSubject<MotionEvent> motion_event = PublishSubject.create();

    public static RxBus getInstance() {
        if (instance == null) {
            instance = new RxBus();
        }
        return instance;
    }

    public void sendMotionEvent(MotionEvent motionEvent) {
        motion_event.onNext(motionEvent);
    }

    public Observable<MotionEvent> getMotionEvent() {
        return motion_event;
    }
}