Android 13：判断是否设置了动态壁纸

Question

I would to check if my Live Wallpaper App is set as Live Wallpaper.

The following code works on Android <= 12 , but not in Android 13 (sdk 33) .

public static boolean isLiveWallpaper(Context context) {
    if (Service._handler == null) {
        return false;
    }
    WallpaperManager wpm = WallpaperManager.getInstance(context);
    WallpaperInfo info = wpm.getWallpaperInfo();
    try {
        return (info != null && info.getPackageName().equals(context.getPackageName()));
    } catch (Exception e) {
        return false;
    }
}

On Android 13 wpm.getWallpaperInfo() always return null .

Why? I searched on Google and on the Android Developer Documentation, but I did'n find anything...

Edit: I set the live wallpaper with this code and it works, but I can't check programmatically if the live wallpaper is setted.

Intent intent = new Intent(WallpaperManager.ACTION_CHANGE_LIVE_WALLPAPER);
intent.putExtra(WallpaperManager.EXTRA_LIVE_WALLPAPER_COMPONENT,
        new ComponentName(context, Service.class));
context.startActivity(intent);

Answer 1

Check the source code of WallpaperManagerService.java

    public WallpaperInfo getWallpaperInfo(int userId) {
    final boolean allow =
            hasPermission(READ_WALLPAPER_INTERNAL) || hasPermission(QUERY_ALL_PACKAGES);
    if (allow) {
        userId = ActivityManager.handleIncomingUser(Binder.getCallingPid(),
                Binder.getCallingUid(), userId, false, true, "getWallpaperInfo", null);
        synchronized (mLock) {
            WallpaperData wallpaper = mWallpaperMap.get(userId);
            if (wallpaper != null && wallpaper.connection != null) {
                return wallpaper.connection.mInfo;
            }
        }
    }

    return null;
}

We can see some permissions are needed to query the wallpaper info.

So, please add the following permission request in your AndroidManifest.xml

    <uses-permission android:name="android.permission.QUERY_ALL_PACKAGES"/>