Overlaps a piccture and a number in android

I'm developing a sample game using GridView. Sometimes i want to add my ArrayOfPicture and ArrayOfNumber together. That's mean a number must be stay inside a picture from the user's view. So how can i stack them together? This is my example code:

private Integer image_id[] = {R.drawable.cl1,
        R.drawable.cl2,
        R.drawable.cl1,
        R.drawable.cl2}
private Integer number_id[] = {R.drawable.num1,
        R.drawable.num2,
        R.drawable.num3}

And this is the view that only show a list of background without number inside:

@Override
public View getView(int arg0, View arg1, ViewGroup arg2) {
    ImageView img;
    if(arg1 == null)
    {
        img = new ImageView(CTX);
        img.setLayoutParams(new GridView.LayoutParams(200,200));
        img.setScaleType(ImageView.ScaleType.CENTER_CROP);
        img.setPadding(8, 8, 8, 8);

    }
    else
    {
        img = (ImageView) arg1;
    }

    img.setImageResource(getImages());
    return img;


    // TODO Auto-generated method stub
    // return null;
}