Android 判断壁纸是否为默认壁纸或是用户设置壁纸
此类有两个值得学习借鉴的地方:
[1] 日常开发中经常无法引用到Context对象,为引用Context不得不修改大量系统原有方法api 一层一层将把Context对象导入到自己想用的方法中,
[2] 判断当前壁纸是否为系统默认壁纸
Java
1 /*
2 * Copyright (C) 2018 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.server;
18
19 import android.annotation.RequiresPermission;
20 import android.app.ActivityThread;
21 import android.app.WallpaperInfo;
22 import android.app.WallpaperManager;
23 import android.content.BroadcastReceiver;
24 import android.content.ComponentName;
25 import android.content.Context;
26 import android.content.Intent;
27 import android.graphics.Bitmap;
28 import android.os.AsyncTask;
29 import android.os.ParcelFileDescriptor;
30 import android.util.Slog;
31
32 /**
33 * Receiver responsible for updating the wallpaper when the device
34 * configuration has changed.
35 *
36 * @hide
37 */
38 public class WallpaperUpdateReceiver extends BroadcastReceiver {
39
40 private static final String TAG = "WallpaperUpdateReceiver";
41 private static final boolean DEBUG = false;
42
43 @Override
44 public void onReceive(final Context context, final Intent intent) {
45 if (DEBUG) Slog.d(TAG, "onReceive: " + intent);
46
47 if (intent != null && Intent.ACTION_DEVICE_CUSTOMIZATION_READY.equals(intent.getAction())) {
48 AsyncTask.execute(this::updateWallpaper);
49 }
50 }
51
52 private void updateWallpaper() {
53 try {
54 ActivityThread currentActivityThread = ActivityThread.currentActivityThread();
55 Context uiContext = currentActivityThread.getSystemUiContext();
56 WallpaperManager wallpaperManager = WallpaperManager.getInstance(uiContext);
57 if (isUserSetWallpaper(wallpaperManager, uiContext)) {
58 Slog.i(TAG, "User has set wallpaper, skip to resetting");
59 return;
60 }
61 if (DEBUG) Slog.d(TAG, "Set customized default_wallpaper.");
62 Bitmap blank = Bitmap.createBitmap(1, 1, Bitmap.Config.ALPHA_8);
63 // set a blank wallpaper to force a redraw of default_wallpaper
64 wallpaperManager.setBitmap(blank);
65 wallpaperManager.setResource(com.android.internal.R.drawable.default_wallpaper);
66 } catch (Exception e) {
67 Slog.w(TAG, "Failed to customize system wallpaper." + e);
68 }
69 }
70
71 /**
72 * A function to validate if users have set customized (live)wallpaper
73 * <p>
74 * return true if users have customized their wallpaper
75 **/
76 @RequiresPermission(android.Manifest.permission.READ_WALLPAPER_INTERNAL)
77 private boolean isUserSetWallpaper(WallpaperManager wm, Context context) {
78 WallpaperInfo info = wm.getWallpaperInfo();
79 if (info == null) {
80 //Image Wallpaper
81 ParcelFileDescriptor sysWallpaper =
82 wm.getWallpaperFile(WallpaperManager.FLAG_SYSTEM);
83 ParcelFileDescriptor lockWallpaper =
84 wm.getWallpaperFile(WallpaperManager.FLAG_LOCK);
85 if (sysWallpaper != null || lockWallpaper != null) {
86 return true;
87 }
88 } else {
89 //live wallpaper
90 ComponentName currCN = info.getComponent();
91 ComponentName defaultCN = WallpaperManager.getDefaultWallpaperComponent(context);
92 if (!currCN.equals(defaultCN)) {
93 return true;
94 }
95 }
96 return false;
97 }
98 }
99
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