From e2678cea5161d8d9616074d7bf4c28ae6f404793 Mon Sep 17 00:00:00 2001
From: cretin45 <cretin45@gmail.com>
Date: Wed, 3 Feb 2016 15:16:52 -0800
Subject: Trebuchet: Fix background flicker when opening all apps

Issue-id: OPO-422

Change-Id: I96136f61fe3b2263f77d162952cf189927334b8b
---
 .../launcher3/LauncherStateTransitionAnimation.java       | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/com/android/launcher3/LauncherStateTransitionAnimation.java b/src/com/android/launcher3/LauncherStateTransitionAnimation.java
index a0fa61d08..4c97727c1 100644
--- a/src/com/android/launcher3/LauncherStateTransitionAnimation.java
+++ b/src/com/android/launcher3/LauncherStateTransitionAnimation.java
@@ -24,6 +24,7 @@ import android.animation.PropertyValuesHolder;
 import android.animation.TimeInterpolator;
 import android.annotation.SuppressLint;
 import android.content.res.Resources;
+import android.graphics.drawable.Drawable;
 import android.util.Log;
 import android.view.View;
 import android.view.animation.AccelerateInterpolator;
@@ -287,6 +288,14 @@ public class LauncherStateTransitionAnimation {
 
             // Setup the animation for the content view
             contentView.setVisibility(View.VISIBLE);
+            /*
+             * Because the contentView and revealView overlap, if their backgrounds have alpha,
+             * it will blend and cause a flicker. So get the current alpha of the contentView (for
+             * later) and set to 0. When the animation is done, reset the alpha.
+             */
+            final Drawable contentBackground = contentView.getBackground();
+            final int alpha = contentBackground.getAlpha();
+            contentBackground.setAlpha(0);
             contentView.setAlpha(0f);
             contentView.setTranslationY(revealViewToYDrift);
             layerViews.put(contentView, BUILD_AND_SET_LAYER);
@@ -327,6 +336,7 @@ public class LauncherStateTransitionAnimation {
 
                     // Hide the reveal view
                     revealView.setVisibility(View.INVISIBLE);
+                    contentBackground.setAlpha(alpha);
 
                     // Disable all necessary layers
                     for (View v : layerViews.keySet()) {
@@ -521,6 +531,9 @@ public class LauncherStateTransitionAnimation {
                 animation.play(workspaceAnim);
             }
 
+            final Drawable contentBackground = contentView.getBackground();
+            final int alpha = contentBackground.getAlpha();
+
             // hideAppsCustomizeHelper is called in some cases when it is already hidden
             // don't perform all these no-op animations. In particularly, this was causing
             // the all-apps button to pop in and out.
@@ -528,6 +541,7 @@ public class LauncherStateTransitionAnimation {
                 int width = revealView.getMeasuredWidth();
                 int height = revealView.getMeasuredHeight();
                 float revealRadius = (float) Math.hypot(width / 2, height / 2);
+                contentBackground.setAlpha(0);
                 revealView.setVisibility(View.VISIBLE);
                 revealView.setAlpha(1f);
                 revealView.setTranslationY(0);
@@ -650,6 +664,7 @@ public class LauncherStateTransitionAnimation {
                         contentView.setTranslationX(0);
                         contentView.setTranslationY(0);
                         contentView.setAlpha(1);
+                        contentBackground.setAlpha(alpha);
                     }
                     if (overlaySearchBarView != null) {
                         overlaySearchBarView.setAlpha(1f);
-- 
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