Whitelist fragments appropriate for an activity

Change-Id: If4f8c4e9d9949b652946cffe0ebb09b587e5a042

src/com/android/settings/accounts/SyncSettingsActivity.java

@@ -16,9 +16,12 @@
 
 package com.android.settings.accounts;
 
+import android.app.Fragment;
 import android.content.Intent;
 import android.preference.PreferenceActivity;
 
+import com.android.settings.ChooseLockGeneric.ChooseLockGenericFragment;
+
 /**
  * Launcher activity for the SyncSettings fragment.
  *
@@ -31,4 +34,10 @@ public class SyncSettingsActivity extends PreferenceActivity {
         modIntent.putExtra(EXTRA_NO_HEADERS, true);
         return modIntent;
     }
+
+    @Override
+    protected boolean isValidFragment(String fragmentName) {
+        if (SyncSettings.class.getName().equals(fragmentName)) return true;
+        return false;
+    }
 }