Add config resource specifying WallpaperManagerService

The config resource can be used by a vendor to override
WallpaperManagerService.

Bug: 69299523
Test: WallpaperServiceTests, WallpaperManagerTest, WallpaperColorTest,
      WallpaperInfoTest.

Change-Id: I9a38117c5b6fdc01aabb8293cde75485023970cd

core/res/res/values/config.xml

@@ -1387,6 +1387,9 @@
     <!-- True if WallpaperService is enabled -->
     <bool name="config_enableWallpaperService">true</bool>
 
+    <!-- Class name of WallpaperManagerService. -->
+    <string name="config_wallpaperManagerServiceName">com.android.server.wallpaper.WallpaperManagerService</string>
+
     <!-- Enables the TimeZoneRuleManager service. This is the master switch for the updateable time
          zone update mechanism. -->
     <bool name="config_enableUpdateableTimeZoneRules">false</bool>

core/res/res/values/symbols.xml

@@ -287,6 +287,7 @@
   <java-symbol type="bool" name="split_action_bar_is_narrow" />
   <java-symbol type="bool" name="config_useVolumeKeySounds" />
   <java-symbol type="bool" name="config_enableWallpaperService" />
+  <java-symbol type="string" name="config_wallpaperManagerServiceName" />
   <java-symbol type="bool" name="config_enableUpdateableTimeZoneRules" />
   <java-symbol type="bool" name="config_timeZoneRulesUpdateTrackingEnabled" />
   <java-symbol type="string" name="config_timeZoneRulesUpdaterPackage" />

services/core/java/com/android/server/wallpaper/IWallpaperManagerService.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.server.wallpaper;
+
+import android.app.IWallpaperManager;
+import android.os.IBinder;
+
+/**
+ * Extended IWallpaperManager which can receive SystemService's lifetime events.
+ */
+interface IWallpaperManagerService extends IWallpaperManager, IBinder {
+    /**
+     * @see com.android.server.SystemService#onBootPhase(int)
+     */
+    void onBootPhase(int phase);
+
+    /**
+     * @see com.android.server.SystemService#onUnlockUser(int)
+     */
+    void onUnlockUser(final int userId);
+}

services/core/java/com/android/server/wallpaper/WallpaperManagerService.java

@@ -99,6 +99,7 @@ import com.android.server.EventLogTags;
 import com.android.server.FgThread;
 import com.android.server.SystemService;
 
+import java.lang.reflect.InvocationTargetException;
 import libcore.io.IoUtils;
 
 import org.xmlpull.v1.XmlPullParser;
@@ -119,14 +120,16 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 import java.util.Objects;
+import com.android.internal.R;
 
-public class WallpaperManagerService extends IWallpaperManager.Stub {
+public class WallpaperManagerService extends IWallpaperManager.Stub
+        implements IWallpaperManagerService {
     static final String TAG = "WallpaperManagerService";
     static final boolean DEBUG = false;
     static final boolean DEBUG_LIVE = DEBUG || true;
 
     public static class Lifecycle extends SystemService {
-        private WallpaperManagerService mService;
+        private IWallpaperManagerService mService;
 
         public Lifecycle(Context context) {
             super(context);
@@ -134,22 +137,30 @@ public class WallpaperManagerService extends IWallpaperManager.Stub {
 
         @Override
         public void onStart() {
-            mService = new WallpaperManagerService(getContext());
-            publishBinderService(Context.WALLPAPER_SERVICE, mService);
+            try {
+                final Class<? extends IWallpaperManagerService> klass =
+                        (Class<? extends IWallpaperManagerService>)Class.forName(
+                                getContext().getResources().getString(
+                                        R.string.config_wallpaperManagerServiceName));
+                mService = klass.getConstructor(Context.class).newInstance(getContext());
+                publishBinderService(Context.WALLPAPER_SERVICE, mService);
+            } catch (Exception exp) {
+                Slog.wtf(TAG, "Failed to instantiate WallpaperManagerService", exp);
+            }
         }
 
         @Override
         public void onBootPhase(int phase) {
-            if (phase == SystemService.PHASE_ACTIVITY_MANAGER_READY) {
-                mService.systemReady();
-            } else if (phase == SystemService.PHASE_THIRD_PARTY_APPS_CAN_START) {
-                mService.switchUser(UserHandle.USER_SYSTEM, null);
+            if (mService != null) {
+                mService.onBootPhase(phase);
             }
         }
 
         @Override
         public void onUnlockUser(int userHandle) {
-            mService.onUnlockUser(userHandle);
+            if (mService != null) {
+                mService.onUnlockUser(userHandle);
+            }
         }
     }
 
@@ -1255,7 +1266,17 @@ public class WallpaperManagerService extends IWallpaperManager.Stub {
         mLockWallpaperMap.remove(userId);
     }
 
-    void onUnlockUser(final int userId) {
+    @Override
+    public void onBootPhase(int phase) {
+        if (phase == SystemService.PHASE_ACTIVITY_MANAGER_READY) {
+            systemReady();
+        } else if (phase == SystemService.PHASE_THIRD_PARTY_APPS_CAN_START) {
+            switchUser(UserHandle.USER_SYSTEM, null);
+        }
+    }
+
+    @Override
+    public void onUnlockUser(final int userId) {
         synchronized (mLock) {
             if (mCurrentUserId == userId) {
                 if (mWaitingForUnlock) {