Update MainActivity.java

app/src/main/java/chat/rocket/android/activity/MainActivity.java

@@ -5,6 +5,7 @@ import android.support.annotation.Nullable;
 import android.support.design.widget.Snackbar;
 import android.support.v4.widget.SlidingPaneLayout;
 import android.support.v7.graphics.drawable.DrawerArrowDrawable;
+import android.support.v7.widget.Toolbar;
 import android.view.View;
 
 import chat.rocket.android.LaunchUtil;
@@ -81,31 +82,11 @@ public class MainActivity extends AbstractAuthedActivity implements MainContract
       }
     });
 
-    final DrawerArrowDrawable drawerArrowDrawable = new DrawerArrowDrawable(this);
-    toolbar.setNavigationIcon(drawerArrowDrawable);
     toolbar.setNavigationOnClickListener(view -> {
       if (pane.isSlideable() && !pane.isOpen()) {
         pane.openPane();
       }
     });
-
-    //ref: ActionBarDrawerToggle#setProgress
-    pane.setPanelSlideListener(new SlidingPaneLayout.PanelSlideListener() {
-      @Override
-      public void onPanelSlide(View panel, float slideOffset) {
-        drawerArrowDrawable.setProgress(slideOffset);
-      }
-
-      @Override
-      public void onPanelOpened(View panel) {
-        drawerArrowDrawable.setVerticalMirror(true);
-      }
-
-      @Override
-      public void onPanelClosed(View panel) {
-        drawerArrowDrawable.setVerticalMirror(false);
-      }
-    });
   }
 
   private boolean closeSidebarIfNeeded() {