diff --git a/quickstep/recents_ui_overrides/src/com/android/launcher3/appprediction/AllAppsTipView.java b/quickstep/recents_ui_overrides/src/com/android/launcher3/appprediction/AllAppsTipView.java
index 079a738..d93aea4 100644
--- a/quickstep/recents_ui_overrides/src/com/android/launcher3/appprediction/AllAppsTipView.java
+++ b/quickstep/recents_ui_overrides/src/com/android/launcher3/appprediction/AllAppsTipView.java
@@ -74,10 +74,6 @@
             launcher.getStateManager().addStateListener(
                     new LauncherStateManager.StateListener() {
                         @Override
-                        public void onStateTransitionStart(LauncherState toState) {
-                        }
-
-                        @Override
                         public void onStateTransitionComplete(LauncherState finalState) {
                             if (finalState == ALL_APPS) {
                                 if (showAllAppsTipIfNecessary(launcher)) {
diff --git a/quickstep/recents_ui_overrides/src/com/android/launcher3/appprediction/AppsDividerView.java b/quickstep/recents_ui_overrides/src/com/android/launcher3/appprediction/AppsDividerView.java
index ec46418..81a6070 100644
--- a/quickstep/recents_ui_overrides/src/com/android/launcher3/appprediction/AppsDividerView.java
+++ b/quickstep/recents_ui_overrides/src/com/android/launcher3/appprediction/AppsDividerView.java
@@ -251,9 +251,6 @@
     }
 
     @Override
-    public void onStateTransitionStart(LauncherState toState) { }
-
-    @Override
     public void onStateTransitionComplete(LauncherState finalState) {
         if (finalState == ALL_APPS) {
             setAllAppsVisitedCount(getAllAppsVisitedCount() + 1);
diff --git a/quickstep/recents_ui_overrides/src/com/android/launcher3/appprediction/PredictionUiStateManager.java b/quickstep/recents_ui_overrides/src/com/android/launcher3/appprediction/PredictionUiStateManager.java
index 8e55609..e68627a 100644
--- a/quickstep/recents_ui_overrides/src/com/android/launcher3/appprediction/PredictionUiStateManager.java
+++ b/quickstep/recents_ui_overrides/src/com/android/launcher3/appprediction/PredictionUiStateManager.java
@@ -158,9 +158,6 @@
     public void reapplyItemInfo(ItemInfoWithIcon info) { }
 
     @Override
-    public void onStateTransitionStart(LauncherState toState) { }
-
-    @Override
     public void onStateTransitionComplete(LauncherState state) {
         if (mAppsView == null) {
             return;
diff --git a/quickstep/src/com/android/quickstep/util/QuickstepOnboardingPrefs.java b/quickstep/src/com/android/quickstep/util/QuickstepOnboardingPrefs.java
index a678cb5..aa6d56a 100644
--- a/quickstep/src/com/android/quickstep/util/QuickstepOnboardingPrefs.java
+++ b/quickstep/src/com/android/quickstep/util/QuickstepOnboardingPrefs.java
@@ -42,9 +42,6 @@
         if (!getBoolean(HOME_BOUNCE_SEEN)) {
             mStateManager.addStateListener(new StateListener() {
                 @Override
-                public void onStateTransitionStart(LauncherState toState) { }
-
-                @Override
                 public void onStateTransitionComplete(LauncherState finalState) {
                     boolean swipeUpEnabled = SysUINavigationMode.INSTANCE
                             .get(mLauncher).getMode().hasGestures;
@@ -70,9 +67,6 @@
         if (!shelfBounceSeen) {
             mStateManager.addStateListener(new StateListener() {
                 @Override
-                public void onStateTransitionStart(LauncherState toState) { }
-
-                @Override
                 public void onStateTransitionComplete(LauncherState finalState) {
                     LauncherState prevState = mStateManager.getLastState();
 
@@ -88,9 +82,6 @@
         if (!hasReachedMaxCount(ALL_APPS_COUNT)) {
             mStateManager.addStateListener(new StateListener() {
                 @Override
-                public void onStateTransitionStart(LauncherState toState) { }
-
-                @Override
                 public void onStateTransitionComplete(LauncherState finalState) {
                     if (finalState == ALL_APPS) {
                         if (incrementEventCount(ALL_APPS_COUNT)) {
diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index c4eab8f..070a392 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -434,9 +434,6 @@
         mRotationHelper.initialize();
 
         mStateManager.addStateListener(new LauncherStateManager.StateListener() {
-            @Override
-            public void onStateTransitionStart(LauncherState toState) {
-            }
 
             @Override
             public void onStateTransitionComplete(LauncherState finalState) {
diff --git a/src/com/android/launcher3/LauncherStateManager.java b/src/com/android/launcher3/LauncherStateManager.java
index e071777..1d2e866 100644
--- a/src/com/android/launcher3/LauncherStateManager.java
+++ b/src/com/android/launcher3/LauncherStateManager.java
@@ -600,7 +600,8 @@
 
     public interface StateListener {
 
-        void onStateTransitionStart(LauncherState toState);
-        void onStateTransitionComplete(LauncherState finalState);
+        default void onStateTransitionStart(LauncherState toState) { }
+
+        default void onStateTransitionComplete(LauncherState finalState) { }
     }
 }
diff --git a/src/com/android/launcher3/dragndrop/DragView.java b/src/com/android/launcher3/dragndrop/DragView.java
index d07635b..1e23bb6 100644
--- a/src/com/android/launcher3/dragndrop/DragView.java
+++ b/src/com/android/launcher3/dragndrop/DragView.java
@@ -176,9 +176,6 @@
     }
 
     @Override
-    public void onStateTransitionStart(LauncherState toState) { }
-
-    @Override
     public void onStateTransitionComplete(LauncherState finalState) {
         setVisibility((finalState == LauncherState.NORMAL
                 || finalState == LauncherState.SPRING_LOADED) ? VISIBLE : INVISIBLE);
diff --git a/src/com/android/launcher3/views/ScrimView.java b/src/com/android/launcher3/views/ScrimView.java
index 442c5fd..da874cf 100644
--- a/src/com/android/launcher3/views/ScrimView.java
+++ b/src/com/android/launcher3/views/ScrimView.java
@@ -118,9 +118,6 @@
 
     private final StateListener mAccessibilityLauncherStateListener = new StateListener() {
         @Override
-        public void onStateTransitionStart(LauncherState toState) {}
-
-        @Override
         public void onStateTransitionComplete(LauncherState finalState) {
             setImportantForAccessibility(finalState == ALL_APPS
                     ? IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS
diff --git a/src/com/android/launcher3/views/WorkEduView.java b/src/com/android/launcher3/views/WorkEduView.java
index d849138..552f662 100644
--- a/src/com/android/launcher3/views/WorkEduView.java
+++ b/src/com/android/launcher3/views/WorkEduView.java
@@ -189,11 +189,6 @@
 
         LauncherStateManager.StateListener listener = new LauncherStateManager.StateListener() {
             @Override
-            public void onStateTransitionStart(LauncherState toState) {
-
-            }
-
-            @Override
             public void onStateTransitionComplete(LauncherState finalState) {
                 if (finalState != LauncherState.ALL_APPS) return;
                 LayoutInflater layoutInflater = LayoutInflater.from(launcher);