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(private val app: Application, private val user: UserHandle) :
33     SmartAsyncMediatorLiveData<String?>() {
34 
loadDataAndPostValuenull35     override suspend fun loadDataAndPostValue(job: Job) {
36         if (job.isCancelled) {
37             return
38         }
39 
40         val packageName =
41             try {
42                 Utils.getUserContext(app, user)
43                     .getSystemService(WallpaperManager::class.java)
44                     ?.wallpaperInfo
45                     ?.packageName
46             } catch (e: NullPointerException) {
47                 null
48             }
49 
50         postValue(packageName)
51     }
52 
53     /**
54      * Repository for [SelectedWallpaperServiceLiveData]
55      *
56      * <p> Key value is a user, value is its corresponding LiveData.
57      */
58     companion object : DataRepositoryForPackage<UserHandle, SelectedWallpaperServiceLiveData>() {
newValuenull59         override fun newValue(key: UserHandle): SelectedWallpaperServiceLiveData {
60             return SelectedWallpaperServiceLiveData(PermissionControllerApplication.get(), key)
61         }
62     }
63 }
64