1 files changed, 2 insertions, 1 deletions
diff --git a/core/java/android/widget/Switch.java b/core/java/android/widget/Switch.java
index 434516da1346..c4a17715896c 100644
--- a/core/java/android/widget/Switch.java
+++ b/core/java/android/widget/Switch.java
@@ -18,6 +18,7 @@ package android.widget;
 
 import android.animation.ObjectAnimator;
 import android.annotation.DrawableRes;
+import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.annotation.StyleRes;
 import android.content.Context;
@@ -1371,7 +1372,7 @@ public class Switch extends CompoundButton {
     }
 
     @Override
-    protected boolean verifyDrawable(Drawable who) {
+    protected boolean verifyDrawable(@NonNull Drawable who) {
         return super.verifyDrawable(who) || who == mThumbDrawable || who == mTrackDrawable;
     }