I cannot change Android wallpaper using WallpaperManager -

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i trying change android wallpaper using code. using wallpapermanager class, no prevail. used .png image in /drawable directory. getting error says, "expected resource of type raw". when run application(when method runs), crashes. must victim of stupid mistake. method changewallpaper() run after user taps button. here code:

 public void changewallpaper(view view) {      try{         wallpapermanager wallpapermanager = wallpapermanager.getinstance(getapplicationcontext());         wallpapermanager.setresource(r.drawable.material_wallpaper);         string successmessage = "wallpaper changes";         toast.maketext(this, successmessage, toast.length_short).show();     } catch (ioexception e) {         e.printstacktrace();         string failedmessage = "operation failed";         toast.maketext(this, failedmessage, toast.length_short).show();     }  }

edit: there no "raw" folder in /res/ directory.

if want stay drawable, can convert resource bitmap , set wallpaper using setbitmap(bitmap _bitmap) (see wallpapermanager).

wallpapermanager wallpapermanager = wallpapermanager.getinstance(getactivity().getapplicationcontext()); bitmap bitmap = bitmapfactory.decoderesource(getactivity().getresources(), r.drawable.material_wallpaper); wallpapermanager.setbitmap(bitmap);

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