Add visual indicator for predicted hotseat icons

Bug: 142753423
Test: Manual
Change-Id: Ie4325660fc5392358ec845ae58385bef279db60f

quickstep/recents_ui_overrides/res/drawable/predicted_icon_background.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<inset xmlns:android="http://schemas.android.com/apk/res/android"
+    android:inset="@dimen/predicted_icon_background_inset">
+    <shape>
+        <solid android:color="?attr/folderFillColor" />
+        <corners android:radius="@dimen/predicted_icon_background_corner_radius" />
+    </shape>
+</inset>

quickstep/recents_ui_overrides/res/values/dimens.xml

@@ -28,4 +28,9 @@
     <dimen name="swipe_up_fling_min_visible_change">18dp</dimen>
     <dimen name="swipe_up_y_overshoot">10dp</dimen>
     <dimen name="swipe_up_max_workspace_trans_y">-60dp</dimen>
+
+    <!-- Predicted icon related -->
+    <dimen name="predicted_icon_background_corner_radius">15dp</dimen>
+    <dimen name="predicted_icon_background_inset">8dp</dimen>
+
 </resources>

quickstep/recents_ui_overrides/src/com/android/launcher3/HotseatPredictionController.java

@@ -139,6 +139,7 @@ public class HotseatPredictionController implements DragController.DragListener,
                 PopupContainerWithArrow.showForIcon((BubbleTextView) v);
                 return true;
             });
+            icon.setBackgroundResource(R.drawable.predicted_icon_background);
         }
     }
 
@@ -205,6 +206,7 @@ public class HotseatPredictionController implements DragController.DragListener,
                 LauncherSettings.Favorites.CONTAINER_HOTSEAT, workspaceItemInfo.screenId,
                 workspaceItemInfo.cellX, workspaceItemInfo.cellY);
         ObjectAnimator.ofFloat(icon, SCALE_PROPERTY, 1, 0.8f, 1).start();
+        icon.reset();
         icon.applyFromWorkspaceItem(workspaceItemInfo);
         icon.setOnLongClickListener(ItemLongClickListener.INSTANCE_WORKSPACE);
     }

src/com/android/launcher3/BubbleTextView.java

@@ -216,6 +216,7 @@ public class BubbleTextView extends TextView implements ItemInfoUpdateReceiver,
         cancelDotScaleAnim();
         mDotParams.scale = 0f;
         mForceHideDot = false;
+        setBackground(null);
     }
 
     private void cancelDotScaleAnim() {