public void setActiveView(View v, int position) {
        final View oldView = mActiveView;
        mActiveView = v;
        mActivePosition = position;

        if (mAllowIndicatorAnimation && oldView != null) {
            startAnimatingIndicator();
        }

        invalidate();
    }
Set the active view.
If the mdActiveIndicator attribute is set, this View will have the indicator drawn next to it.

@param v        The active view.
@param position Optional position, usually used with ListView. v.setTag(R.id.mdActiveViewPosition, position)
                must be called first.
menudrawer/src/net/simonvt/menudrawer/MenuDrawer.java