From 32a7e2f35769631243af7b70aeb968a9784279df Mon Sep 17 00:00:00 2001
From: SzuWei Lin <szuweilin@google.com>
Date: Thu, 22 Nov 2018 14:33:01 +0800
Subject: [PATCH] Nullify the default wallpaper component if it does not exist

The default wallpaper component cannot be found after GSI is flashed.
The home screen background will have no wallpaper and be black.
It will also cause the following CTS tests to fail:

- KeyguardTests#testDialogShowWhenLockedActivity
- KeyguardTests#testTranslucentShowWhenLockedActivity

The patch will check if the package of the default component exists.
If not, it will fall back to null, which is the AOSP default value, and
display the wallpaper in framework resource.

Bug: 119895131
Bug: 111909699
Test: flash GSI aosp_arm64-userdebug on a crosshatch, got AOSP wallpaper
Test: flash full crosshatch-userdebug on a crosshatch, got crosshatch wallpaper
Change-Id: I9d618d05458a03a675324cb2f861decf31c5bf18
Merged-In: I9d618d05458a03a675324cb2f861decf31c5bf18
(cherry picked from commit 1c7ae31e97f0d90b16dcbefff9c436601cba7007)
---
 core/java/android/app/WallpaperManager.java | 28 ++++++++++++++-------
 1 file changed, 19 insertions(+), 9 deletions(-)

diff --git a/core/java/android/app/WallpaperManager.java b/core/java/android/app/WallpaperManager.java
index fde756c13234c..a81546dc1d471 100644
--- a/core/java/android/app/WallpaperManager.java
+++ b/core/java/android/app/WallpaperManager.java
@@ -1874,23 +1874,33 @@ public class WallpaperManager {
      * @hide
      */
     public static ComponentName getDefaultWallpaperComponent(Context context) {
+        ComponentName cn = null;
+
         String flat = SystemProperties.get(PROP_WALLPAPER_COMPONENT);
         if (!TextUtils.isEmpty(flat)) {
-            final ComponentName cn = ComponentName.unflattenFromString(flat);
-            if (cn != null) {
-                return cn;
+            cn = ComponentName.unflattenFromString(flat);
+        }
+
+        if (cn == null) {
+            flat = context.getString(com.android.internal.R.string.default_wallpaper_component);
+            if (!TextUtils.isEmpty(flat)) {
+                cn = ComponentName.unflattenFromString(flat);
             }
         }
 
-        flat = context.getString(com.android.internal.R.string.default_wallpaper_component);
-        if (!TextUtils.isEmpty(flat)) {
-            final ComponentName cn = ComponentName.unflattenFromString(flat);
-            if (cn != null) {
-                return cn;
+        // Check if the package exists
+        if (cn != null) {
+            try {
+                final PackageManager packageManager = context.getPackageManager();
+                packageManager.getPackageInfo(cn.getPackageName(),
+                        PackageManager.MATCH_DIRECT_BOOT_AWARE
+                                | PackageManager.MATCH_DIRECT_BOOT_UNAWARE);
+            } catch (PackageManager.NameNotFoundException e) {
+                cn = null;
             }
         }
 
-        return null;
+        return cn;
     }
 
     /**