Toast throws ArrayIndexOutOfBoundsException with appcompat v26 when using fontFamily attribute in theme

Question

Whenever I show a Toast, the app crashes.

The app works fine if I use older version of AppCompat library or remove fontFamily from the styl

Answer 1

According to the Android Developer Guide for fonts in xml

Adding fonts to style

Open the styles.xml, and set the fontFamily attribute to the font file you want to access.

In your case you should put the @font/ prefix

@font/sans-serif-light