Google Glass GDK-CardScrollAdapter getHomePosition无法正常工作

Question

In the official GDK documentation for the CardScrollAdapter ( link ) it states that you can override public int getHomePosition() to have your adapter define a new "home" position (aka: The view that is initially displayed when the parent CardScrollView is displayed/activated). The problem is... I've attempted to do this but public int getHomePosition() never appears to be called by the adapter.

Here is a simplified example...

public abstract class StackOverflowExample extends CardScrollAdapter
{
    private Context m_context = null;

    public StackOverflowExample(Context context)
    {
        super();
        m_context = context;
    }

    @Override public final int getCount()
    {
        return 3;
    }

    @Override public int getHomePosition()
    {
        return 1;
    }

    // Other misc adapter overrides here...

    @Override public View getView(int position, View view, ViewGroup parent)
    {
        Card glassCard = new Card(m_context);
        glassCard.setText("Position: " + position);
        return glassCard.getView(view, parent);
    }
}

When I initialize and assign this adapter to a CardScrollView and then activate() it, the first card displayed is "Position: 0".

My question is, am I using getHomePosition() incorrectly or does it simply not work as expected in the latest Glass Development Kit Preview release?

Answer 1

I haven't actually used getHomePosition() , but I have gotten the same functionality you are describing by using mCardScrollView.setSelection(homePosition) right after setting the content view. If you haven't gotten this working by now, this might help.

EDIT: After looking through the docs, I think they meant the overridden function to be used like this:

mCardScrollView.setSelection(getHomePosition())

Otherwise it would make more sense to call it setHomePosition()