how set current wallpaper as my application background image Android?

Question

I want to get mobile`s current wallpaper and set that image as the background image of the application. I tried this way but its show a run time exception

final WallpaperManager wallpaperManager = WallpaperManager.getInstance(this);
final Drawable wallpaperDrawable = wallpaperManager.getDrawable();
layout.setBackground(wallpaperDrawable);

Answer 1

 final WallpaperManager wallpaperManager = WallpaperManager.getInstance(this);
 final Drawable wallpaperDrawable = wallpaperManager.getFastDrawable();
 getWindow().setBackgroundDrawable(wallpaperDrawable);