Google Glass: open menu on touch in regular Card

Question

How do I have the menu pop up on a regular Card. I have tried to use this code:

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
     if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER) {
          openOptionsMenu();
          return true;
     }
     return false;
}

But it doesn't seem to work. Also, is it possible to put Live Cards in an Activity like I did here. I believe I am using Static Cards, but eventually I will need access to the camera and video functions through these Cards.

Activity

public class NewChecklistActivity extends Activity {

private GestureDetector mGestureDetector;
private List<Card> mCards;
private CardScrollView mCardScrollView;
StepCardScrollAdapter adapter;

Intent checklistIntent;
String allStepsJSONString;
ArrayList<String[]> allStepsArray;
ArrayList<String[]> checklistsArray;
ArrayList<String[]> stepsArray;
ArrayList<String[]> checklistSteps;

@SuppressWarnings("unchecked")
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    checklistsArray = (ArrayList<String[]>) this.getIntent().getSerializableExtra("checklists");
    stepsArray = (ArrayList<String[]>) this.getIntent().getSerializableExtra("steps");

    createCards();
    mCardScrollView = new CardScrollView(this);
    adapter = new StepCardScrollAdapter();
    mCardScrollView.setAdapter(adapter);
    mCardScrollView.activate();
    setContentView(mCardScrollView);
    mCardScrollView.setOnItemClickListener(adapter);
    checklistIntent = new Intent(this, ChecklistActivity.class);
}

private void createCards() {
    mCards = new ArrayList<Card>();
    Card card;
    String[] checklist;

    for (int i = 0; i < checklistsArray.size(); i++) {
        checklist = checklistsArray.get(i);
        card = new Card(this);
        card.setText(checklist[1]);
        mCards.add(card);
    }
}

private class StepCardScrollAdapter extends CardScrollAdapter implements OnItemClickListener {

    @Override
    public int findIdPosition(Object id) {
        return -1;
    }

    @Override
    public int findItemPosition(Object item) {
        return mCards.indexOf(item);
    }

    @Override
    public int getCount() {
        return mCards.size();
    }

    @Override
    public Object getItem(int position) {
        return mCards.get(position);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        return mCards.get(position).toView();
    }

    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
        checklistIntent.putExtra("steps", getChecklistSteps(adapter.findItemPosition(position)));
        startActivity(checklistIntent);
    }
}

Answer 1

It looks like you're using a CardScrollView, which is going to intercept all of the touchpad gestures and that's why your onKeyDown method isn't getting called.

For this specific case, you can attach an OnItemClickListener to the card scroller and use that listener to find out when one of the cards is tapped. Then, call openOptionsMenu from there.

If you need to have different menu items for different cards, you'll need to store the index of the card that gets passed into the listener and then use that information inside onPrepareOptionsMenu to load different items. The flow would look like this:

1. You create a private field in your activity class that will store the index of the last tapped card.
2. In your onItemClick method, you store the index you're given in that field, and then you call openOptionsMenu.
3. This causes onPrepareOptionsMenu to be called. Override that method and do whatever modifications you need to the menu based on the index stored in that field (inflate a menu, add/remove items, etc.). You have to do this inside onPrepareOptionsMenu instead of onCreateOptionsMenu because you want it to happen every time the user taps, not just the first time the menu is initialized.
4. Handle onOptionsItemSelected as you normally would.