Clean up dead code

Author: niftynei

app/src/main/java/com/zulip/android/activities/MessageListFragment.java

@@ -63,8 +63,6 @@ public class MessageListFragment extends Fragment implements MessageListener {
     public interface Listener {
         void onListResume(MessageListFragment f);
 
-        void addToList(Message message);
-
         void recyclerViewScrolled();
 
         void clearChatBox();
@@ -374,7 +372,6 @@ public void onMessages(Message[] messages, LoadPosition pos,
 
             if (stream != null && filter == null) { //Filter muted messages only in homescreen.
                 if (mMutedTopics.isTopicMute(message)) {
-                    mListener.addToList(message);
                     continue;
                 }
             }

app/src/main/java/com/zulip/android/activities/ZulipActivity.java

@@ -12,7 +12,6 @@
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.IntentFilter;
-import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
 import android.content.res.Configuration;
 import android.database.Cursor;
@@ -126,14 +125,11 @@ public class ZulipActivity extends BaseActivity implements
     private static final int MIN_THRESOLD_EMOJI_HINT = 1;
     private static final int PERMISSION_REQUEST_READ_CONTACTS = 1;
     private ZulipApp app;
-    private List<Message> mutedTopics;
 
     private boolean suspended = false;
     private boolean logged_in = false;
 
     private ZulipActivity that = this; // self-ref
-    private SharedPreferences settings;
-    String client_id;
 
     private DrawerLayout drawerLayout;
     private ActionBarDrawerToggle drawerToggle;
@@ -151,8 +147,6 @@ public class ZulipActivity extends BaseActivity implements
 
     private Handler statusUpdateHandler;
 
-    private Toolbar toolbar;
-
     public MessageListFragment currentList;
     private MessageListFragment narrowedList;
     private MessageListFragment homeList;
@@ -242,11 +236,6 @@ public boolean setViewValue(View view, Cursor cursor, int i) {
 
     private RefreshableCursorAdapter peopleAdapter;
 
-    @Override
-    public void addToList(Message message) {
-        mutedTopics.add(message);
-    }
-
     @Override
     public void recyclerViewScrolled() {
             /* in this method we check if the messageEt is empty or not
@@ -309,7 +298,7 @@ protected void onCreate(Bundle savedInstanceState) {
         notifications = new Notifications(this);
         notifications.register();
         setContentView(R.layout.main);
-        toolbar = (Toolbar) findViewById(R.id.toolbar);
+        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
         setSupportActionBar(toolbar);
         getSupportActionBar().setDisplayHomeAsUpEnabled(true);
         getSupportActionBar().setHomeButtonEnabled(true);
@@ -323,7 +312,6 @@ protected void onCreate(Bundle savedInstanceState) {
         appBarLayout = (AppBarLayout) findViewById(R.id.appBarLayout);
         app.setZulipActivity(this);
         togglePrivateStreamBtn = (ImageView) findViewById(R.id.togglePrivateStream_btn);
-        mutedTopics = new ArrayList<>();
         drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
         drawerToggle = new ActionBarDrawerToggle(this, drawerLayout,
                 R.drawable.ic_drawer, R.string.streams_open,