Reusing LayoutListener instead of creating a new one everytime

Bug: 122345781
Change-Id: Ica43849030afb497b0444e9ce474e7c3bdb9ee73

quickstep/src/com/android/quickstep/ActivityControlHelper.java

@@ -154,7 +154,7 @@ public interface ActivityControlHelper<T extends BaseDraggingActivity> {
 
         @Override
         public LayoutListener createLayoutListener(Launcher activity) {
-            return new LauncherLayoutListener(activity);
+            return LauncherLayoutListener.resetAndGet(activity);
         }
 
         @Override

quickstep/src/com/android/quickstep/views/LauncherLayoutListener.java

@@ -40,17 +40,35 @@ import com.android.quickstep.WindowTransformSwipeHandler;
 public class LauncherLayoutListener extends AbstractFloatingView
         implements Insettable, LayoutListener {
 
+    public static LauncherLayoutListener resetAndGet(Launcher launcher) {
+        LauncherRecentsView lrv = launcher.getOverviewPanel();
+        LauncherLayoutListener listener = lrv.mLauncherLayoutListener;
+        if (listener.isOpen()) {
+            listener.close(false);
+        }
+        listener.setHandler(null);
+        return listener;
+    }
+
     private final Launcher mLauncher;
     private final Paint mPaint = new Paint();
     private WindowTransformSwipeHandler mHandler;
     private RectF mCurrentRect;
     private float mCornerRadius;
 
-    public LauncherLayoutListener(Launcher launcher) {
+    private boolean mWillNotDraw;
+
+    /**
+     * package private
+     */
+    LauncherLayoutListener(Launcher launcher) {
         super(launcher, null);
         mLauncher = launcher;
         mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
         setLayoutParams(new FrameLayout.LayoutParams(MATCH_PARENT, MATCH_PARENT));
+
+        mWillNotDraw = willNotDraw();
+        super.setWillNotDraw(false);
     }
 
     @Override
@@ -68,6 +86,12 @@ public class LauncherLayoutListener extends AbstractFloatingView
         invalidate();
     }
 
+    @Override
+    public void setWillNotDraw(boolean willNotDraw) {
+        // Prevent super call as that causes additional relayout.
+        mWillNotDraw = willNotDraw;
+    }
+
     @Override
     public void setHandler(WindowTransformSwipeHandler handler) {
         mHandler = handler;
@@ -125,6 +149,8 @@ public class LauncherLayoutListener extends AbstractFloatingView
 
     @Override
     protected void onDraw(Canvas canvas) {
-        canvas.drawRoundRect(mCurrentRect, mCornerRadius, mCornerRadius, mPaint);
+        if (!mWillNotDraw) {
+            canvas.drawRoundRect(mCurrentRect, mCornerRadius, mCornerRadius, mPaint);
+        }
     }
 }

quickstep/src/com/android/quickstep/views/LauncherRecentsView.java

@@ -35,6 +35,7 @@ import android.view.View;
 import android.view.ViewDebug;
 
 import com.android.launcher3.AbstractFloatingView;
+import com.android.launcher3.BaseActivity;
 import com.android.launcher3.DeviceProfile;
 import com.android.launcher3.Launcher;
 import com.android.launcher3.LauncherState;
@@ -70,6 +71,7 @@ public class LauncherRecentsView extends RecentsView<Launcher> {
     private float mTranslationYFactor;
 
     private final TransformParams mTransformParams = new TransformParams();
+    final LauncherLayoutListener mLauncherLayoutListener;
 
     public LauncherRecentsView(Context context) {
         this(context, null);
@@ -82,6 +84,7 @@ public class LauncherRecentsView extends RecentsView<Launcher> {
     public LauncherRecentsView(Context context, AttributeSet attrs, int defStyleAttr) {
         super(context, attrs, defStyleAttr);
         setContentAlpha(0);
+        mLauncherLayoutListener = new LauncherLayoutListener(BaseActivity.fromContext(context));
     }
 
     @Override