Set upper case for TextView
In the layout XML, you can set the android:textAllCaps attribute on your TextView:
<TextView android:textAllCaps="true"></TextView>
Use String class method while setting the text to TextView as
tv.setText(strings.toUpperCase());
Have a look at this post for detail discussion.
EDIT: This was answered way back before API 14. As other answer mentioned here, textView.isAllCaps = true and its java methods were introduced from TextView. Please use those.