code: public static void startGalleryApp(@NonNull final Context context, @NonNull final File file) {
          Condition.INSTANCE.ensureNotNull(file, "The file may not be null");
          Condition.INSTANCE
                  .ensureFileIsNoDirectory(file, "The file must exist and must not be a directory");
          startGalleryApp(context, Uri.parse("file://" + file.getAbsolutePath()));
      }
docs: Starts the gallery app in order to show a specific image. If an error occurs while starting
  the gallery app, an {@link ActivityNotFoundException} will be thrown.
  
  @param context
  The context, the gallery app should be started from, as an instance of the class
  {@link Context}. The context may not be null
  @param file
  The file, which stores the image, which should be shown, as an instance of the class
  {@link File}. The file may not be null. The file must exist and must not be a
  directory.