Backup app data with BackupManager

[Igor Velikorossov]

Google provides data backup service (https://developer.android.com/guide/topics/data/backup.html), which I'm trying to take advantage of.

I followed the instructions, but I can't seem to get it working. I've done the following:

1. Registered for the backup service and got the key

2. Updated the manifest.xml

   
   <application android:backupAgent="app.namespace.MyBackupAgentHelper"
                android:restoreAnyVersion="true">
   
       <!-- backup service registration -->
       <meta-data android:name="com.google.android.backup.api_key" 
                  android:value="xxxxxxxxxxxxxxxxxxxxxx" />

3. Extended BackupAgentHelper

   
   namespace App.Namespace
   {
       public class MyBackupAgentHelper : BackupAgentHelper
       {
           public override void OnCreate()
           {
               base.OnCreate();
               var fbh = new FileBackupHelper(this, this.GetDatabasePath(Const.Database.Name).AbsolutePath);
               this.AddHelper("DATABASE", fbh);
           }
       }
   }

4. In my database helper I initialise BackupManager and upon data change call this.backupManager.DataChanged();

And it doesn't seem to work as expected - when I uninstall and reinstall the app the database I expect to be backup isn't getting restored.

I have also tried instigating backup manually (as per instructionshttps://developer.android.com/guide/topics/data/backup.html#Testing) to no avail.

Any help is appreciated. Thanks

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