Handle devices disallowing start of FcmFetchService.

Some devices are overzealous with battery management and disallow
starting services even when they're in response to a high-priority FCM
message (which should be allowed). So in these situations, we just
fall back to what we were doing before.

app/src/main/java/org/thoughtcrime/securesms/gcm/FcmFetchService.java

@@ -1,10 +1,12 @@
 package org.thoughtcrime.securesms.gcm;
 
 import android.app.Service;
+import android.content.Context;
 import android.content.Intent;
 import android.os.Build;
 import android.os.IBinder;
 
+import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
 import com.google.firebase.messaging.RemoteMessage;
@@ -70,25 +72,29 @@ public class FcmFetchService extends Service {
   }
 
   private void fetch() {
-    BackgroundMessageRetriever retriever = ApplicationDependencies.getBackgroundMessageRetriever();
-    boolean                    success   = retriever.retrieveMessages(this, new RestStrategy(), new RestStrategy());
-
-    if (success) {
-      Log.i(TAG, "Successfully retrieved messages.");
-    } else {
-      if (Build.VERSION.SDK_INT >= 26) {
-        Log.w(TAG, "Failed to retrieve messages. Scheduling on the system JobScheduler (API " + Build.VERSION.SDK_INT + ").");
-        FcmJobService.schedule(this);
-      } else {
-        Log.w(TAG, "Failed to retrieve messages. Scheduling on JobManager (API " + Build.VERSION.SDK_INT + ").");
-        ApplicationDependencies.getJobManager().add(new PushNotificationReceiveJob(this));
-      }
-    }
+    retrieveMessages(this);
 
     if (activeCount.decrementAndGet() == 0) {
       Log.e(TAG, "stopping");
       stopSelf();
     }
   }
+
+  static void retrieveMessages(@NonNull Context context) {
+    BackgroundMessageRetriever retriever = ApplicationDependencies.getBackgroundMessageRetriever();
+    boolean                    success   = retriever.retrieveMessages(context, new RestStrategy(), new RestStrategy());
+
+    if (success) {
+      Log.i(TAG, "Successfully retrieved messages.");
+    } else {
+      if (Build.VERSION.SDK_INT >= 26) {
+        Log.w(TAG, "Failed to retrieve messages. Scheduling on the system JobScheduler (API " + Build.VERSION.SDK_INT + ").");
+        FcmJobService.schedule(context);
+      } else {
+        Log.w(TAG, "Failed to retrieve messages. Scheduling on JobManager (API " + Build.VERSION.SDK_INT + ").");
+        ApplicationDependencies.getJobManager().add(new PushNotificationReceiveJob(context));
+      }
+    }
+  }
 }
 

app/src/main/java/org/thoughtcrime/securesms/gcm/FcmReceiveService.java

@@ -2,6 +2,7 @@ package org.thoughtcrime.securesms.gcm;
 
 import android.content.Context;
 import android.content.Intent;
+import android.os.Build;
 
 import androidx.annotation.NonNull;
 
@@ -10,7 +11,9 @@ import com.google.firebase.messaging.RemoteMessage;
 
 import org.thoughtcrime.securesms.dependencies.ApplicationDependencies;
 import org.thoughtcrime.securesms.jobs.FcmRefreshJob;
+import org.thoughtcrime.securesms.jobs.PushNotificationReceiveJob;
 import org.thoughtcrime.securesms.logging.Log;
+import org.thoughtcrime.securesms.messages.RestStrategy;
 import org.thoughtcrime.securesms.registration.PushChallengeRequest;
 import org.thoughtcrime.securesms.util.TextSecurePreferences;
 
@@ -43,7 +46,12 @@ public class FcmReceiveService extends FirebaseMessagingService {
   }
 
   private static void handleReceivedNotification(Context context) {
-    context.startService(new Intent(context, FcmFetchService.class));
+    try {
+      context.startService(new Intent(context, FcmFetchService.class));
+    } catch (Exception e) {
+      Log.w(TAG, "Failed to start service. Falling back to legacy approach.");
+      FcmFetchService.retrieveMessages(context);
+    }
   }
 
   private static void handlePushChallenge(@NonNull String challenge) {