Pass MasterSecret into pref fragments

Fixes #2868
Closes #2870

// FREEBIE

src/org/thoughtcrime/securesms/ApplicationPreferencesActivity.java

@@ -69,16 +69,7 @@ public class ApplicationPreferencesActivity extends PassphraseRequiredActionBarA
   @Override
   protected void onCreate(Bundle icicle, @NonNull MasterSecret masterSecret) {
     this.getSupportActionBar().setDisplayHomeAsUpEnabled(true);
-
-    Bundle   fragmentArgs = new Bundle();
-    Fragment fragment     = new ApplicationPreferenceFragment();
-
-    fragmentArgs.putParcelable("master_secret", masterSecret);
-    fragment.setArguments(fragmentArgs);
-
-    getSupportFragmentManager().beginTransaction()
-                               .replace(android.R.id.content, fragment)
-                               .commit();
+    initFragment(android.R.id.content, new ApplicationPreferenceFragment(), masterSecret);
   }
 
   @Override
@@ -185,10 +176,7 @@ public class ApplicationPreferencesActivity extends PassphraseRequiredActionBarA
           fragment = new NotificationsPreferenceFragment();
           break;
         case PREFERENCE_CATEGORY_APP_PROTECTION:
-          Bundle args = new Bundle();
-          args.putParcelable("master_secret", masterSecret);
           fragment = new AppProtectionPreferenceFragment();
-          fragment.setArguments(args);
           break;
         case PREFERENCE_CATEGORY_APPEARANCE:
           fragment = new AppearancePreferenceFragment();
@@ -203,6 +191,10 @@ public class ApplicationPreferencesActivity extends PassphraseRequiredActionBarA
           throw new AssertionError();
         }
 
+        Bundle args = new Bundle();
+        args.putParcelable("master_secret", masterSecret);
+        fragment.setArguments(args);
+
         FragmentManager     fragmentManager     = getActivity().getSupportFragmentManager();
         FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
         fragmentTransaction.replace(android.R.id.content, fragment);

src/org/thoughtcrime/securesms/preferences/AdvancedPreferenceFragment.java

@@ -22,6 +22,7 @@ import org.thoughtcrime.securesms.R;
 import org.thoughtcrime.securesms.RegistrationActivity;
 import org.thoughtcrime.securesms.contacts.ContactAccessor;
 import org.thoughtcrime.securesms.contacts.ContactIdentityManager;
+import org.thoughtcrime.securesms.crypto.MasterSecret;
 import org.thoughtcrime.securesms.push.TextSecureCommunicationFactory;
 import org.thoughtcrime.securesms.util.ProgressDialogAsyncTask;
 import org.thoughtcrime.securesms.util.TextSecurePreferences;
@@ -39,9 +40,12 @@ public class AdvancedPreferenceFragment extends PreferenceFragment {
 
   private static final int PICK_IDENTITY_CONTACT = 1;
 
+  private MasterSecret masterSecret;
+
   @Override
   public void onCreate(Bundle paramBundle) {
     super.onCreate(paramBundle);
+    masterSecret = getArguments().getParcelable("master_secret");
     addPreferencesFromResource(R.xml.preferences_advanced);
 
     initializePushMessagingToggle();
@@ -186,12 +190,11 @@ public class AdvancedPreferenceFragment extends PreferenceFragment {
         builder.show();
       } else {
         Intent nextIntent = new Intent(getActivity(), ApplicationPreferencesActivity.class);
-        nextIntent.putExtra("master_secret", getActivity().getIntent().getParcelableExtra("master_secret"));
 
         Intent intent = new Intent(getActivity(), RegistrationActivity.class);
         intent.putExtra("cancel_button", true);
         intent.putExtra("next_intent", nextIntent);
-        intent.putExtra("master_secret", getActivity().getIntent().getParcelableExtra("master_secret"));
+        intent.putExtra("master_secret", masterSecret);
         startActivity(intent);
       }