code: public void setProgressStyle(int style) {
          LoadingDrawable drawable = null;
          if (style == STYLE_CIRCLE) {
              Resources resources = getResources();
              drawable = new LoadingCircleDrawable(resources.getDimensionPixelOffset(R.dimen.g_loading_minSize),
                      resources.getDimensionPixelOffset(R.dimen.g_loading_maxSize));
          } else if (style == STYLE_LINE) {
              drawable = new LoadingLineDrawable();
          }
          setLoadingDrawable(drawable);
      }
docs: Change the loading style
  You can set {@link #STYLE_CIRCLE} or {@link #STYLE_LINE} parameters
  
  @param style {@link #STYLE_CIRCLE} or {@link #STYLE_LINE}