Fix crashing issue on bootup

Signed-off-by: Mario Danic <mario@lovelyhq.com>

src/main/java/com/owncloud/android/MainApp.java

@@ -323,6 +323,10 @@ public class MainApp extends MultiDexApplication {
                 createChannel(notificationManager, NotificationUtils.NOTIFICATION_CHANNEL_FILE_SYNC,
                         R.string.notification_channel_file_sync_name,
                         R.string.notification_channel_file_sync_description, context);
+
+                createChannel(notificationManager, NotificationUtils.NOTIFICATION_CHANNEL_FILE_OBSERVER,
+                        R.string.notification_channel_file_observer_name, R.string
+                                .notification_channel_file_observer_description, context);
             } else {
                 Log_OC.e(TAG, "Notification manager is null");
             }

src/main/java/com/owncloud/android/services/observer/FileObserverService.java

@@ -22,22 +22,28 @@
 package com.owncloud.android.services.observer;
 
 import android.accounts.Account;
+import android.app.Notification;
 import android.app.Service;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.database.Cursor;
+import android.graphics.BitmapFactory;
 import android.os.IBinder;
+import android.support.v4.app.NotificationCompat;
 
 import com.owncloud.android.MainApp;
+import com.owncloud.android.R;
 import com.owncloud.android.authentication.AccountUtils;
 import com.owncloud.android.datamodel.OCFile;
 import com.owncloud.android.db.ProviderMeta.ProviderTableMeta;
 import com.owncloud.android.files.services.FileDownloader;
 import com.owncloud.android.lib.common.utils.Log_OC;
 import com.owncloud.android.operations.SynchronizeFileOperation;
+import com.owncloud.android.ui.notifications.NotificationUtils;
 import com.owncloud.android.utils.FileStorageUtils;
+import com.owncloud.android.utils.ThemeUtils;
 
 import java.io.File;
 import java.util.HashMap;
@@ -68,6 +74,8 @@ public class FileObserverService extends Service {
     private final static String ARG_FILE = "ARG_FILE";
     private final static String ARG_ACCOUNT = "ARG_ACCOUNT";
 
+    private static final int FOREGROUND_SERVICE_ID = 333;
+
     private static final String TAG = FileObserverService.class.getSimpleName();
 
     private Map<String, FolderObserver> mFolderObserversMap;
@@ -115,6 +123,19 @@ public class FileObserverService extends Service {
         Log_OC.d(TAG, "onCreate");
         super.onCreate();
 
+        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
+            Notification notification = new NotificationCompat.Builder(this,
+                    NotificationUtils.NOTIFICATION_CHANNEL_FILE_OBSERVER)
+                    .setContentTitle(getResources().getString(R.string.notification_channel_file_observer_name))
+                    .setContentText(getResources().getString(R.string.notification_channel_file_observer_description))
+                    .setSmallIcon(R.drawable.notification_icon)
+                    .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.drawable.notification_icon))
+                    .setColor(ThemeUtils.primaryColor())
+                    .build();
+
+            startForeground(FOREGROUND_SERVICE_ID, notification);
+        }
+
         mDownloadReceiver = new DownloadCompletedReceiver();
         IntentFilter filter = new IntentFilter();
         filter.addAction(FileDownloader.getDownloadAddedMessage());

src/main/java/com/owncloud/android/ui/notifications/NotificationUtils.java

@@ -38,6 +38,7 @@ public class NotificationUtils {
     public static final String NOTIFICATION_CHANNEL_UPLOAD = "NOTIFICATION_CHANNEL_UPLOAD";
     public static final String NOTIFICATION_CHANNEL_MEDIA = "NOTIFICATION_CHANNEL_MEDIA";
     public static final String NOTIFICATION_CHANNEL_FILE_SYNC = "NOTIFICATION_CHANNEL_FILE_SYNC";
+    public static final String NOTIFICATION_CHANNEL_FILE_OBSERVER = "NOTIFICATION_CHANNEL_FILE_OBSERVER";
 
     /**
      * Factory method for {@link android.support.v4.app.NotificationCompat.Builder} instances.

src/main/res/values/strings.xml

@@ -736,6 +736,8 @@
     <string name="notification_channel_media_description">Music player progress</string>
     <string name="notification_channel_file_sync_name">File sync</string>
     <string name="notification_channel_file_sync_description">Shows file sync progress and results</string>
+    <string name="notification_channel_file_observer_name">File observer</string>
+    <string name="notification_channel_file_observer_description">Monitors files for changes</string>
   
     <string name="account_not_found">Account not found!</string>