How to give equal spacing between text?

I have to display following data in this format in text view.

1 Address : Sample address.
2 Contact : contact1, contact2
3 Email : sampleemail@hgjasd.com.
4 Website : www.sample.com.
5 Attached with : Apolo.
6 Services : Heart Transplant.

but the ":" is not aligned properly and there is no equal space between them How can i acheive this

This is what i tried

if (mrecordsObj.has("website")) {

            if(!mrecordsObj.getString("website").isEmpty())
            mBuilder.append("Website    :" + mrecordsObj.getString("website") + "n"+"n");

        }
        if (mrecordsObj.has("extrainfo")) {

            if(!mrecordsObj.getString("extrainfo").isEmpty())
            mBuilder.append("Extrainfo  :" + mrecordsObj.getString("extrainfo") + "n"+"n");

        }