I am not quite sure if you were looking for the following, but:
actionBar.setSubtitle(String string) sets a second line with smaller font underneath your main Title.
example:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_left_drawer_item_clicked);
String value = getIntent().getExtras().getString("drawerItemString");
ActionBar actionBar = getActionBar();
// Make sure we're running on Honeycomb or higher to use ActionBar APIs
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
// Show the Up button in the action bar.
actionBar.setDisplayHomeAsUpEnabled(true);
}
actionBar.setTitle(selectedBook.getTitle());
actionBar.setSubtitle(selectedBook.getAuthorName());
}
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