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1、情景：近日测试人员发现第一次更换壁纸后，主屏幕壁纸和锁屏壁纸均会改变；但第二次更换壁纸后，主屏幕壁纸会改变而锁屏壁纸不会改变。

2、要求：主屏幕壁纸和锁屏壁纸军改变

3、解决

路径：****\frameworks\base\services\core\java\com\android\server\wallpaper\WallpaperManagerService.java

synchronized (mLock) {if (DEBUG) Slog.v(TAG, "setWallpaper which=0x" + Integer.toHexString(which));WallpaperData wallpaper;/* If we're setting system but not lock, and lock is currently sharing the system* wallpaper, we need to migrate that image over to being lock-only before* the caller here writes new bitmap data.*//* if (which == FLAG_SYSTEM && mLockWallpaperMap.get(userId) == null) {Slog.i(TAG, "Migrating current wallpaper to be lock-only before"+ "updating system wallpaper");