Issue 4029 - SharedPreference related crash on filter list fetch

src/org/adblockplus/sbrowser/contentblocker/ContentBlockerContentProvider.java

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2016 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 31 matching lines @@
   private Engine engine = null;
 
   @Override
   public Bundle call(String method, String arg, Bundle extras)
   {
     // As of SBC interface v1.4 we return `null` here to signal that we do not
     // use encryption
     return null;
   }
 
+  private static boolean getBooleanPref(final SharedPreferences prefs, final String key,
+      final boolean defValue)
+  {
+    try
+    {
+      return prefs.getBoolean(key, defValue);
+    }
+    catch (final Throwable t)
+    {
+      return defValue;
+    }
+  }
+
   private void setApplicationActivated()
   {
     final SharedPreferences prefs = PreferenceManager
-        .getDefaultSharedPreferences(this.getContext());
+        .getDefaultSharedPreferences(this.getContext().getApplicationContext());
     final String key = this.getContext().getString(R.string.key_application_activated);
-    final boolean applicationActived = prefs.getBoolean(key, false);
+    final boolean applicationActived = getBooleanPref(prefs, key, false);
     if (!applicationActived)
     {
       prefs.edit()
           .putBoolean(key, true)
           .commit();
     }
   }
 
   @Override
   public ParcelFileDescriptor openFile(final Uri uri, final String mode)
@@ skipping 16 matching lines @@
     catch (IOException e)
     {
       Log.e(TAG, "File creation failed: " + e.getMessage(), e);
       return null;
     }
   }
 
   @Override
   public boolean onCreate()
   {
-    EngineService.startService(this.getContext(), this);
+    EngineService.startService(this.getContext().getApplicationContext(), this);
     return true;
   }
 
   @Override
   public Cursor query(final Uri uri, final String[] projection, final String selection,
       final String[] selectionArgs, final String sortOrder)
   {
     return null;
   }
 
@@ skipping 24 matching lines @@
 
   @Override
   public void onEngineCreated(Engine engine, boolean success)
   {
     if (success)
     {
       this.engine = engine;
     }
   }
 }