@Override
    public void onRtlPropertiesChanged(int layoutDirection) {
        super.onRtlPropertiesChanged(layoutDirection);

        if (!mCustomDropShadow) setDropShadowColor(mDropShadowColor);

        if (getPosition() != mResolvedPosition) {
            mResolvedPosition = getPosition();
            setOffsetPixels(mOffsetPixels * -1);
        }

        if (mSlideDrawable != null) mSlideDrawable.setIsRtl(layoutDirection == LAYOUT_DIRECTION_RTL);

        requestLayout();
        invalidate();
    }
Update the {@link Rect} where the indicator is drawn.
menudrawer/src/net/simonvt/menudrawer/MenuDrawer.java