Fade in background scrim when resuming from screen off.

This change hides the hard cut off that appears when the Launcher
window is transitioning upwards when resuming from when the screen
is off.

Bug: 36446766

Change-Id: I0c0fe13ee9e08d27b94916d0407ef431d82b8d6a

3 files changed, 38 insertions, 1 deletions

diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index c96c2a7b9..f77308e14 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -18,7 +18,9 @@ package com.android.launcher3;
 
 import android.Manifest;
 import android.animation.Animator;
+import android.animation.AnimatorListenerAdapter;
 import android.animation.AnimatorSet;
+import android.animation.ObjectAnimator;
 import android.animation.ValueAnimator;
 import android.annotation.SuppressLint;
 import android.annotation.TargetApi;
@@ -267,6 +269,8 @@ public class Launcher extends BaseActivity
     private boolean mHasFocus = false;
     private boolean mAttached = false;
 
+    private ObjectAnimator mScrimAnimator;
+
     private PopupDataProvider mPopupDataProvider;
 
     private View.OnTouchListener mHapticFeedbackTouchListener;
@@ -920,6 +924,24 @@ public class Launcher extends BaseActivity
         if (!isWorkspaceLoading()) {
             NotificationListener.setNotificationsChangedListener(mPopupDataProvider);
         }
+
+        if (mIsResumeFromActionScreenOff && mDragLayer.getBackground() != null) {
+            if (mScrimAnimator != null) {
+                mScrimAnimator.cancel();
+            }
+            mDragLayer.getBackground().setAlpha(0);
+            mScrimAnimator = ObjectAnimator.ofInt(mDragLayer.getBackground(),
+                    LauncherAnimUtils.DRAWABLE_ALPHA, 0, 255);
+            mScrimAnimator.addListener(new AnimatorListenerAdapter() {
+                @Override
+                public void onAnimationEnd(Animator animation) {
+                    mScrimAnimator = null;
+                }
+            });
+            mScrimAnimator.setDuration(600);
+            mScrimAnimator.setStartDelay(getWindow().getTransitionBackgroundFadeDuration());
+            mScrimAnimator.start();
+        }
     }
 
     @Override
diff --git a/src/com/android/launcher3/LauncherAnimUtils.java b/src/com/android/launcher3/LauncherAnimUtils.java
index 2be2021f1..cfb9b570b 100644
--- a/src/com/android/launcher3/LauncherAnimUtils.java
+++ b/src/com/android/launcher3/LauncherAnimUtils.java
@@ -21,6 +21,7 @@ import android.animation.AnimatorSet;
 import android.animation.ObjectAnimator;
 import android.animation.PropertyValuesHolder;
 import android.animation.ValueAnimator;
+import android.graphics.drawable.Drawable;
 import android.util.Property;
 import android.view.View;
 import android.view.ViewTreeObserver;
@@ -128,4 +129,16 @@ public class LauncherAnimUtils {
         return anim;
     }
 
+    public static final Property<Drawable, Integer> DRAWABLE_ALPHA =
+            new Property<Drawable, Integer>(Integer.TYPE, "drawableAlpha") {
+                @Override
+                public Integer get(Drawable drawable) {
+                    return drawable.getAlpha();
+                }
+
+                @Override
+                public void set(Drawable drawable, Integer alpha) {
+                    drawable.setAlpha(alpha);
+                }
+            };
 }
diff --git a/src/com/android/launcher3/allapps/AllAppsBackgroundDrawable.java b/src/com/android/launcher3/allapps/AllAppsBackgroundDrawable.java
index c71bc3166..54c5bd0b2 100644
--- a/src/com/android/launcher3/allapps/AllAppsBackgroundDrawable.java
+++ b/src/com/android/launcher3/allapps/AllAppsBackgroundDrawable.java
@@ -25,6 +25,7 @@ import android.graphics.Rect;
 import android.graphics.drawable.Drawable;
 import android.view.Gravity;
 
+import com.android.launcher3.LauncherAnimUtils;
 import com.android.launcher3.R;
 
 /**
@@ -119,7 +120,8 @@ public class AllAppsBackgroundDrawable extends Drawable {
         int finalAlphaI = (int) (finalAlpha * 255f);
         if (getAlpha() != finalAlphaI) {
             mBackgroundAnim = cancelAnimator(mBackgroundAnim);
-            mBackgroundAnim = ObjectAnimator.ofInt(this, "alpha", finalAlphaI);
+            mBackgroundAnim = ObjectAnimator.ofInt(this, LauncherAnimUtils.DRAWABLE_ALPHA,
+                    finalAlphaI);
             mBackgroundAnim.setDuration(duration);
             mBackgroundAnim.start();
         }