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
public          


        

Answer 1

Declare a variable ActionBar toolbar and use it this way:

toolbar=((AppCompatActivity) getActivity()).getSupportActionBar();

toolbar.setHomeAsUpIndicator(R.drawable.ic_arrow_left);
toolbar.setTitle("Detalhes");