放置XSD的最佳场所(Best place to place XSD)

 我只有一个hacky解决方案，我愿意接受如何改进它的建议。 但它的确有效。 
 
 诀窍是在实际选择之后有一个不可见的项目被选中。 这样，当您重新选择所选项时，将再次调用onNavigationItemSelected 。 
 
public class ReselectAdapter extends ArrayAdapter<String> {
    private Context mContext;
    private ArrayList<String> mItems;
    private int mInternalPosition;

    public ReselectAdapter(Context context, ArrayList<String> items) {
        super(context, R.layout.sherlock_spinner_item, items);
        mContext = context;
        mItems = items;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        TextView textView = (TextView) convertView;
        if (textView == null) {
            textView = (TextView) LayoutInflater.from(mContext).inflate(
                    R.layout.sherlock_spinner_item, null);
            textView.setText(mItems.get(mInternalPosition));
        }
        return textView;
    }

    @Override
    public View getDropDownView(int position, View convertView, ViewGroup
            parent) {
        TextView textView = null;
        if (position == mItems.size() - 1) {
            textView = new TextView(mContext);
            textView.setHeight(0);
        } else {
            textView = (TextView) LayoutInflater.from(mContext)
                    .inflate(R.layout.sherlock_spinner_dropdown_item, 
                            parent, false);
            textView.setText(mItems.get(position));
        }
        parent.setVerticalScrollBarEnabled(false);
        return textView;
    }

    public void setInternalPosition(int internalPosition) {
        mInternalPosition = internalPosition;
    }
}
 

 
@Override
public void onCreate(Bundle savedInstanceState) {
    // [...]
    ArrayList<String> items = new ArrayList<String>();
    items.add("A");
    items.add("B");
    items.add("C");
    items.add(""); // the last item is the invisible one
    mReselectAdapter = new ReselectAdapter(context, items);
    getSupportActionBar().setListNavigationCallbacks(mReselectAdapter, this);
}
 

 
@Override
public boolean onNavigationItemSelected(int itemPosition, long itemId) {
    int navigationItemCount = getSupportActionBar().getNavigationItemCount();
    if (itemPosition == navigationItemCount - 1) {
        return true;
    }
    Log.i("onNavigationItemSelected", mReselectAdapter.getItem(itemPosition));
    mReselectAdapter.setInternalPosition(itemPosition);
    getSupportActionBar().setSelectedNavigationItem(navigationItemCount - 1);
    return true;
}

I only have a hacky solution to this and I am open for suggestions how to improve it. But it works. 
 
The trick is to have an invisible item that gets selected after the actual selection. This way, onNavigationItemSelected gets called again when you reselect the selected item.
 
public class ReselectAdapter extends ArrayAdapter<String> {
    private Context mContext;
    private ArrayList<String> mItems;
    private int mInternalPosition;

    public ReselectAdapter(Context context, ArrayList<String> items) {
        super(context, R.layout.sherlock_spinner_item, items);
        mContext = context;
        mItems = items;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        TextView textView = (TextView) convertView;
        if (textView == null) {
            textView = (TextView) LayoutInflater.from(mContext).inflate(
                    R.layout.sherlock_spinner_item, null);
            textView.setText(mItems.get(mInternalPosition));
        }
        return textView;
    }

    @Override
    public View getDropDownView(int position, View convertView, ViewGroup
            parent) {
        TextView textView = null;
        if (position == mItems.size() - 1) {
            textView = new TextView(mContext);
            textView.setHeight(0);
        } else {
            textView = (TextView) LayoutInflater.from(mContext)
                    .inflate(R.layout.sherlock_spinner_dropdown_item, 
                            parent, false);
            textView.setText(mItems.get(position));
        }
        parent.setVerticalScrollBarEnabled(false);
        return textView;
    }

    public void setInternalPosition(int internalPosition) {
        mInternalPosition = internalPosition;
    }
}
 

 
@Override
public void onCreate(Bundle savedInstanceState) {
    // [...]
    ArrayList<String> items = new ArrayList<String>();
    items.add("A");
    items.add("B");
    items.add("C");
    items.add(""); // the last item is the invisible one
    mReselectAdapter = new ReselectAdapter(context, items);
    getSupportActionBar().setListNavigationCallbacks(mReselectAdapter, this);
}
 

 
@Override
public boolean onNavigationItemSelected(int itemPosition, long itemId) {
    int navigationItemCount = getSupportActionBar().getNavigationItemCount();
    if (itemPosition == navigationItemCount - 1) {
        return true;
    }
    Log.i("onNavigationItemSelected", mReselectAdapter.getItem(itemPosition));
    mReselectAdapter.setInternalPosition(itemPosition);
    getSupportActionBar().setSelectedNavigationItem(navigationItemCount - 1);
    return true;
}