code: @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
      public static DisplayManager getDisplayManager(Context context) {
          return (DisplayManager) context.getSystemService(Context.DISPLAY_SERVICE);
      }
docs: Get the {@link android.hardware.display.DisplayManager} service for this context.
  @param context the context.
  @return the {@link android.hardware.display.DisplayManager}