Question

我是android的新手。在我的应用中，我在应用关闭时没有收到通知。如果它正在运行它收到。我一直试过但仍然没有得到解决方案。请找出我犯的错误

这是我的代码：

的Manifest.xml：

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" />
<uses-permission android:name="com.google.android.c2dm.permission.REGISTER" />
<uses-permission android:name="android.permission.EXPAND_STATUS_BAR" />
<permission android:name="com.h2o.permission.C2D_MESSAGE"
 android:protectionLevel="signature" />
 <uses-permission android:name="com.h2o.permission.C2D_MESSAGE" />
 <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

<receiver
     android:name="com.h2o.ExternalReceiver"
 android:permission="com.google.android.c2dm.permission.SEND" >
 <intent-filter>
    <action android:name="android.intent.action.BOOT_COMPLETED"/>
    <action android:name="com.google.android.c2dm.intent.RECEIVE" />
    <action android:name="com.google.android.c2dm.intent.REGISTRATION" />
    <action android:name="com.google.android.c2dm.intent.REGISTER" />
    <category android:name="com.google.android.gcm.demo.app" />
  </intent-filter>
</receiver>


<service
android:name="com.h2o.MessageReceivingService"
android:label="com.h2o.MessageReceivingService" >
<intent-filter>
   <action android:name="com.h2o.ExternalReceiver" />
   <category android:name="com.h2o"/>
</intent-filter>
</service>

接收者：

public class ExternalReceiver extends WakefulBroadcastReceiver { 
  public void onReceive(Context context, Intent intent) {
    // Explicitly specify that GcmIntentService will handle the intent.
       ComponentName comp = new ComponentName(context.getPackageName(),MessageReceivingService.class.getName());
       startWakefulService(context,(intent.setComponent(comp)));
       setResultCode(Activity.RESULT_OK);
  }
}

服务：

public class MessageReceivingService extends Service{
private GoogleCloudMessaging gcm;
public static SharedPreferences savedValues;

public static void sendToApp(Bundle extras, Context context){
    Intent newIntent = new Intent();
    newIntent.setClass(context, AndroidMobilePushApp.class);
    newIntent.putExtras(extras);
    newIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    context.startActivity(newIntent);
}

public void onCreate(){
    super.onCreate();
    final String preferences = getString(R.string.preferences);
    savedValues = getSharedPreferences(preferences, Context.MODE_PRIVATE);

    gcm = GoogleCloudMessaging.getInstance(getBaseContext());
    SharedPreferences savedValues = PreferenceManager.getDefaultSharedPreferences(this);
    if(savedValues.getBoolean(getString(R.string.first_launch), true)){
        register();
        SharedPreferences.Editor editor = savedValues.edit();
        editor.putBoolean(getString(R.string.first_launch), false);
        editor.commit();
    }
    if(savedValuess.getBoolean(getString(R.string.first_launch), true)){
        // Let AndroidMobilePushApp know we have just initialized and there may be stored messages
        sendToApp(new Bundle(), this);
    }
}

protected static void saveToLog(Bundle extras, Context context){
    SharedPreferences.Editor editor=savedValues.edit();
    String numOfMissedMessages = context.getString(R.string.num_of_missed_messages);
    int linesOfMessageCount = 0;
    for(String key : extras.keySet()){
        String line = String.format("%s=%s", key, extras.getString(key));
        editor.putString("MessageLine" + linesOfMessageCount, line);
        linesOfMessageCount++;
    }
    editor.putInt(context.getString(R.string.lines_of_message_count), linesOfMessageCount);
    editor.putInt(context.getString(R.string.lines_of_message_count), linesOfMessageCount);
    editor.putInt(numOfMissedMessages, savedValues.getInt(numOfMissedMessages, 0) + 1);
    editor.commit();
    postNotification(new Intent(context, AndroidMobilePushApp.class), context);
}

protected static void postNotification(Intent intentAction, Context context){
    final NotificationManager mNotificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);

    final PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intentAction, Notification.DEFAULT_LIGHTS | Notification.FLAG_AUTO_CANCEL);
    final Notification notification = new NotificationCompat.Builder(context).setSmallIcon(R.drawable.ic_launcher)
            .setContentTitle("Message Received!")
            .setContentText("")
            .setContentIntent(pendingIntent)
            .setAutoCancel(true)
            .getNotification();

    mNotificationManager.notify(R.string.notification_number, notification);
}

private void register() {
    new AsyncTask(){
        protected Object doInBackground(final Object... params) {
            String token;
            try {
                token = gcm.register(getString(R.string.project_number));
                Log.i("registrationId", token);
            } 
            catch (IOException e) {
                Log.i("Registration Error", e.getMessage());
            }
            return true;
        }
    }.execute(null, null, null);
}

public IBinder onBind(Intent arg0) {
    return null;
}

}

提前致谢！

Answer 1

为了能够在应用程序关闭时收到通知，您必须使用以下权限注册服务监听器

android:permission="android.permission.BIND_NOTIFICATION_LISTENER_SERVICE"

有关详细信息，请参阅文档

https://developer.android.com/reference/android/service/notification/NotificationListenerService.html

Answer 2

您需要在清单中定义广播接收器，如下所示：

<receiver
android:name=".GcmBroadcastReceiver"
android:permission="com.google.android.c2dm.permission.SEND" >
<intent-filter>
    <!-- Receives the actual messages. -->
    <action android:name="com.google.android.c2dm.intent.RECEIVE" />
    <category android:name="com.google.android.gcm.demo.app" />
</intent-filter>

并在广播接收器类中添加以下代码：

public class GcmBroadcastReceiver extends WakefulBroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
    // Explicitly specify that GcmIntentService will handle the intent.
    ComponentName comp = new ComponentName(context.getPackageName(),
            GcmIntentService.class.getName());
    // Start the service, keeping the device awake while it is launching.
    startWakefulService(context, (intent.setComponent(comp)));
    setResultCode(Activity.RESULT_OK);
}}

唤醒广播接收器存在一些问题，请阅读此内容 Confusion about WakefulBroadcastReceiver

为了获得最佳实践，建议您使用Firebase云消息传递（FCM）代替GCM。

通知使用GCM在Lollipop中关闭应用时未收到

2 个答案: