How to set custom typeface for an android widget?

Without seeing your code and without knowing what exception is being thrown what follows is all guesswork. I take it you are using something like the following?

String fontFamily = "Arial";
Typeface tf = Typeface.Create(fontFamily, Typeface.DEFAULT);
myTextView.setTypeface(tf);

• Have you a null reference to the myTextView?
• Is the font family you want to use actually present?
• What does Typeface.Create() return if the font family isn't available?

Assuming you are using Eclipse; suggest that you run the offending code in the emulator and either single step from a break point and/or wrap the failing code in a try/catch block and log the exception details which will then be available for inspection in logcat.

See setTypeface[^]
and Typeface[^]