Setting a subtitle on my Toolbar from a fragment

Question

I am having some trouble setting the sub-title in my Toolbar from my fragment. I keep getting a Null Pointer Exception at the setSubTitle.

@Override
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Answer 1

To use the Toolbar and the Appcompat 21, you have to use an AppCompatActivity and use:

((AppCompatActivity) getActivity()).getSupportActionBar().setSubtitle("About");