public class ButtonsGridViewOptions extends GridView {
public ButtonsGridViewOptions(Context context, AttributeSet attrs){
    super(context, attrs);
    ButtonsGridViewAdapter gridViewAdapter = new ButtonsGridViewAdapter(context);
    setAdapter(gridViewAdapter);
}

private class ButtonsGridViewAdapter extends BaseAdapter {

    private Context context;

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View v = convertView;
        if(v == null){
            LayoutInflater inflater = ((Activity)context).getLayoutInflater();
            v = inflater.inflate(R.layout.button, parent, false);
            NumberButton btn;
            btn = (NumberButton) v;
            btn.setTextSize(10);
            btn.setId(position);

            switch (position) {
                case 0: {
                    btn.setText("Del");
                    btn.setNumber(0, 9);
                    break;
                }
                case 1: {
                    btn.setText("Undo");
                    btn.setNumber(0, 10);
                    break;
                }
                case 2: {
                    btn.setText("Redo");
                    btn.setNumber(0, 11);
                    break;
                }
                case 3: {
                    btn.setText("Draft");
                    btn.setNumber(0, 12);
                    break;
                }
            }
            return btn;
        }
        return v;
    }
}