1 /*
2  * Copyright (C) 2020 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.permissioncontroller.permission.data
18 
19 import android.app.Application
20 import android.app.WallpaperManager
21 import android.os.UserHandle
22 import com.android.permissioncontroller.PermissionControllerApplication
23 import com.android.permissioncontroller.permission.utils.Utils
24 import kotlinx.coroutines.Job
25 
26 /**
27  * A LiveData which tracks selected wallpaper service package
28  *
29  * @param app The current application
30  * @param user The user the services should be determined for
31  */
32 class SelectedWallpaperServiceLiveData(
33     private val app: Application,
34     private val user: UserHandle
35 ) : SmartAsyncMediatorLiveData<String?>() {
36 
37     override suspend fun loadDataAndPostValue(job: Job) {
38         if (job.isCancelled) {
39             return
40         }
41 
42         val packageName = try {
43             Utils.getUserContext(app, user)
44                     .getSystemService(WallpaperManager::class.java)
45                     ?.wallpaperInfo
46                     ?.packageName
47         } catch (e: NullPointerException) {
48             null
49         }
50 
51         postValue(packageName)
52     }
53 
54     /**
55      * Repository for [SelectedWallpaperServiceLiveData]
56      *
57      * <p> Key value is a user, value is its corresponding LiveData.
58      */
59     companion object : DataRepositoryForPackage<UserHandle,
60             SelectedWallpaperServiceLiveData>() {
61         override fun newValue(key: UserHandle): SelectedWallpaperServiceLiveData {
62             return SelectedWallpaperServiceLiveData(PermissionControllerApplication.get(), key)
63         }
64     }
65 }