为什么应用程序未运行时不调用我的 GcmListenerService.onMessageReceived？

Question

我需要在我的应用程序中创建并显示一些自定义推送通知（需要传递一些数据并在单击时打开一些特定的活动）。我做了所有像here描述的事情。

当应用程序运行时，一切都按预期工作。但是当它在后台时，我的服务没有启动，我收到一个推送通知，将我带到应用程序的启动屏幕。

我进行了很多研究，但没有找到对这种行为的解释。 谁能告诉我为什么应用程序在后台时忽略我的服务？

这是在我的清单文件中：

<permission
    android:name="com.locdel.permission.C2D_MESSAGE"
    android:protectionLevel="signature" />

<uses-permission android:name="com.locdel.permission.C2D_MESSAGE" />
<uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" />
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="android.permission.WAKE_LOCK" />

......................

<application
    android:name=".LocdelApplication"
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">

    <receiver
        android:name="com.google.android.gms.gcm.GcmReceiver"
        android:exported="true"
        android:permission="com.google.android.c2dm.permission.SEND">
        <intent-filter>
            <action android:name="com.google.android.c2dm.intent.RECEIVE" />
            <category android:name="com.locdel" />
        </intent-filter>
    </receiver>

    <service
        android:name="com.locdel.gcm.LocdelGcmListenerService"
        android:exported="false">
        <intent-filter>
            <action android:name="com.google.android.c2dm.intent.RECEIVE" />
        </intent-filter>
    </service>
    <service
        android:name="com.locdel.gcm.LocdelIDListenerService"
        android:exported="false">
        <intent-filter>
            <action android:name="com.google.android.gms.iid.InstanceID" />
        </intent-filter>
    </service>
    <service
        android:name=".gcm.RegistrationIntentService"
        android:exported="false" >
        <intent-filter>
            <action android:name="com.google.android.c2dm.intent.RECEIVE" />
        </intent-filter>
    </service>

.......................

我什至尝试扩展我自己的唤醒广播接收器并明确启动服务。这是自定义receiver的onReceive方法，实际调用了，但是服务没有重新启动：

@Override
public void onReceive(Context context, Intent intent) {
    Intent serviceIntent = new Intent(context, LocdelGcmListenerService.class);
    serviceIntent.setAction("com.google.android.c2dm.intent.RECEIVE");
    serviceIntent.putExtras(intent.getExtras());
    startWakefulService(context, serviceIntent);
    setResultCode(Activity.RESULT_OK);
}

Answer 1

点击以下链接：

http://www.androidwarriors.com/2015/10/push-notification-using-gcm-in-android.html

希望对你有帮助。

Answer 2

当收到这样的消息时，您需要检查活动是否正在运行

 ActivityManager am = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
    List<ActivityManager.RunningTaskInfo> taskInfo = am.getRunningTasks(1);
    ComponentName componentInfo = taskInfo.get(0).topActivity;
    if(componentInfo.getPackageName().equalsIgnoreCase("com.example.myapp")){

        updateMyActivity(message);  //send broadcast to notify app



        //Activity Running
//            Send a broadcast with the intent-filter which you register in your activity
//            where you want to have the updates
        }
        else{
            //Activity Not Running
            //Generate Notification
            sendNotification(message);
        }

Answer 3

尝试从 onReceive 以这种方式调用通知

 private void sendNotification(String message) {
            Intent intent = new Intent(this,FullMapActivity.class);
            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    //        int color = getResources().getColor(R.color.my_notif_color);
            PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
            /*PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 *//* Request code *//*, intent,
                    PendingIntent.FLAG_ONE_SHOT);*/

            Uri defaultSoundUri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
            if (android.os.Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {



                NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
                        .setSmallIcon(R.drawable.headerlogo)
                        .setContentTitle("hey..! your booking is confirmed")
                        .setContentText(message)
                        .setAutoCancel(true)
                        .setSound(defaultSoundUri)
                        .setContentIntent(pendingIntent);


                NotificationManager notificationManager =
                        (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

                notificationManager.notify(0 /* ID of notification */, notificationBuilder.build());
            }
            else
            {

                NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
                        .setSmallIcon(R.drawable.headerlogo)
                        .setContentTitle("hey..! your booking is confirmed")
                        .setContentText(message)
                        .setAutoCancel(true)
    //                    .setColor(color)
                        .setSound(defaultSoundUri)
                        .setContentIntent(pendingIntent);


                NotificationManager notificationManager =
                        (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

                notificationManager.notify(0 /* ID of notification */, notificationBuilder.build());
            }
        }

Answer 4

https://github.com/google/gcm/issues/63

在上面的链接中明确提到，如果存在“通知”有效负载，那么 android 将触发通知。尝试删除“通知”有效负载并仅发送“数据”有效负载，您的 onMessageReceived 应该会被调用。