How to change size of title's text on Action Bar?

Question

There is an ActionBar on each Android 4.0 application, and it got a title. I need to make this size less. But I don\'t understand how I can do it, because

Answer 1

I have followed this method to skip the creation of custom style:

1. Create a custom layout with required text size and
2. apply that to your action bar.

1) Create a layout file (titlebar.xml):

Here set your required textSize.

2) MainActivity.java

    getSupportActionBar().setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM); //bellow setSupportActionBar(toolbar);
    getSupportActionBar().setCustomView(R.layout.titlebar);

hope this helps.