使用WallpaperManager类
FLAG_LOCK为锁屏壁纸
FLAG_SYSTEM为桌面壁纸

//使用WallpaperManager类@TargetApi(Build.VERSION_CODES.N)private Bitmap getLockWallpaper(){WallpaperManager wallpaperManager = WallpaperManager.getInstance(mContext);//获取WallpaperManager实例ParcelFileDescriptor mParcelFileDescriptor = wallpaperManager.getWallpaperFile(WallpaperManager.FLAG_LOCK);//获取锁屏壁纸if(mParcelFileDescriptor ==null){mParcelFileDescriptor = wallpaperManager.getWallpaperFile(WallpaperManager.FLAG_SYSTEM);//获取桌面壁纸//在未主动设置锁屏壁纸时，锁屏壁纸为null，默认取的是桌面壁纸，}FileDescriptor fileDescriptor = mParcelFileDescriptor.getFileDescriptor();Bitmap image = BitmapFactory.decodeFileDescriptor(fileDescriptor);//获取Bitmap类型返回值try {mParcelFileDescriptor.close();} catch(Exception e) {android.util.Log.d(TAG,"mParcelFileDescriptor.close() error");}return image;}private void setBackground(){获取壁纸后设置为view的背景try {Drawable drawable =new BitmapDrawable(getLockWallpaper());//将Bitmap类型转换为Drawable类型mView.setBackgroundDrawable(drawable);//设置背景drawable.setColorFilter(Color.GRAY, PorterDuff.Mode.MULTIPLY);//设置背景灰度} catch(Exception e) {android.util.Log.d(TAG,"set Background fail");}}