Question

功能＆＃34; onReceive＆＃34;如果BroadcastReceiver在Manifest中注册，则会调用，但如果动态注册则调用 NOT 。

有效的代码如下：

public class EyeGesture extends BroadcastReceiver {
    //Eye Gesture
    private static IntentFilter eyeGestureIntent;
    private static Context eyeGestureContext;
    private static StringBuilder gestureInfo = null;
    private static BroadcastReceiver broadcastReceiver;

   // public void startEyeListening() {
        //Eye Gesture

    //}

    @Override
    public void onReceive(Context context, Intent intent) {
       // this = context;
        if (intent.getStringExtra("gesture").equals("WINK")) {
            Log.e("WINKED ","");
        }else {
            Log.e("SOMETHING", "is detected " + intent.getStringExtra("gesture"));
        }
        //Disable Camera Snapshot
       // abortBroadcast();

    }

    public void stopEyeListening() {
        eyeGestureContext.unregisterReceiver(broadcastReceiver);
        eyeGestureIntent = null;
        eyeGestureContext = null;
        gestureInfo = null;
    }

}

以下是清单文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.inno.inno.glassplugin" >

    <uses-permission android:name="com.google.android.glass.permission.DEVELOPMENT" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainFunct"
            android:icon="@drawable/ic_glass_logo"
            android:label="@string/title_activity_main_funct" >
            <intent-filter>
                <action android:name="com.google.android.glass.action.VOICE_TRIGGER" />
            </intent-filter>
            <meta-data
                android:name="com.google.android.glass.VoiceTrigger"
                android:resource="@xml/voice_trigger" />
        </activity>

        <receiver android:name="com.inno.inno.glassplugin.EyeGesture">
            <intent-filter>
                <action android:name="com.google.android.glass.action.EYE_GESTURE" />
            </intent-filter>
        </receiver>
    </application>

</manifest>

问题是＆＃34; onReceive＆＃34;动态注册时调用 NOT 。我必须以动态的方式做到这一点。以下是 NOT 工作代码的代码。

public class EyeGesture extends Activity {
    //Eye Gesture
    IntentFilter eyeGestureIntentFilter;
    Context eyeGestureContext;
    BroadcastReceiver broadcastReceiver;


    public  EyeGesture(){
        Log.e("CONSTRUCTOR ", "");
        eyeGestureContext = MainFunct.getCurrentContext();
        eyeGestureIntentFilter = new IntentFilter("com.google.glass.action.EYE_GESTURE");
        eyeGestureIntentFilter.setPriority(1000);
        startRunning();
    }

    void startRunning(){
        eyeGestureContext.registerReceiver(new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                Log.e("Received ", " Something");
            }
        },eyeGestureIntentFilter);
    }


    @Override
    public  void onResume(){
        super.onResume();
    }

    @Override
    public  void  onPause(){
        super.onPause();
        unregisterReceiver(broadcastReceiver);
    }
    public void stopEyeListening() {
        eyeGestureContext.unregisterReceiver(broadcastReceiver);
        eyeGestureIntentFilter = null;
        eyeGestureContext = null;
    }

}

另外，我不想从这个类扩展BroadcastReceiver。如果动态注册，为什么我没有收到任何内容。我还从Manifest中删除了以下行：

 <receiver android:name="com.inno.inno.glassplugin.EyeGesture">
                <intent-filter>
                    <action android:name="com.google.android.glass.action.EYE_GESTURE" />
                </intent-filter>
 </receiver>

但仍然没有用。没有抛出错误或异常。我做错了什么？

Answer 1

您是否使用明确的意图？似乎动态注册的广播接收器无法接收显式意图。隐含的意图工作。供参考：http://streamingcon.blogspot.com/2014/04/dynamic-broadcastreceiver-registration.html

如果问题不是显式意图，但如果您使用LocalBroadcastManager进行sendBroadcast，那么请确保registerReceiver也被称为LocalBroadcastManager而不是Context

Answer 2

尝试使用ApplicationContext而不是Activity。

Modyifing line：

eyeGestureContext = MainFunct.getCurrentContext();

我会按此顺序尝试：

eyeGestureContext = getApplicationContext();
eyeGestureContext = getApplication();

如果以上不起作用，我会扩展应用程序并执行：

public class MyExtendedApplication extends Application {

    private static MyExtendedApplication instance;

    public static MyExtendedApplication getInstance() {
        return instance;
    }
}

这适用于全球＆＃34; android.net.conn.CONNECTIVITY_CHANGE＆＃34;广播

Context c = MyExtendedApplication.getInstance();
c.registerReceiver(
        connectivtyChangedReceiver,
        connectivityFilter);

你也可以使用＆＃34; com.google.android.glass.action.EYE_GESTURE＆＃34;

Answer 3

在XE21.3中观看adb logcat，看起来com.google.android.glass.action.EYE_GESTURE意图永远不会到达事件总线;相反，它直接跳到com.google.glass.action.TAKE_PICTURE，这与相机按钮的意图相同。所以看起来像是没有公告就删除了眼睛姿势API。

Answer 4

接收方应扩展BroadcastReceiver类。
在清单中定义接收器
在代码中（可能是onCreate），注册接收器
- 创建接收器对象
- 定义意图过滤器
- 调用RegisterReceiver（）传入接收者和意图过滤器

BroadcastReceiver onReceive（）在动态注册时不调用

4 个答案: