From 1c7ae31e97f0d90b16dcbefff9c436601cba7007 Mon Sep 17 00:00:00 2001
From: SzuWei Lin <szuweilin@google.com>
Date: Thu, 22 Nov 2018 14:33:01 +0800
Subject: 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
---
 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 e7ba2e6be5c2..b8c98420aada 100644
--- a/core/java/android/app/WallpaperManager.java
+++ b/core/java/android/app/WallpaperManager.java
@@ -1885,23 +1885,33 @@ 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;
     }
 
     /**
-- 
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