Migrating to android-x

Change-Id: I9a774152d13a541e8496dd84f2469bfed407f86d
diff --git a/src/com/android/launcher3/folder/PreviewBackground.java b/src/com/android/launcher3/folder/PreviewBackground.java
index 86266e6..ceb1a8c 100644
--- a/src/com/android/launcher3/folder/PreviewBackground.java
+++ b/src/com/android/launcher3/folder/PreviewBackground.java
@@ -30,7 +30,6 @@
 import android.graphics.RadialGradient;
 import android.graphics.Region;
 import android.graphics.Shader;
-import android.support.v4.graphics.ColorUtils;
 import android.util.Property;
 import android.view.View;
 
@@ -40,6 +39,8 @@
 import com.android.launcher3.R;
 import com.android.launcher3.util.Themes;
 
+import androidx.core.graphics.ColorUtils;
+
 /**
  * This object represents a FolderIcon preview background. It stores drawing / measurement
  * information, handles drawing, and animation (accept state <--> rest state).