+ setContentView(R.layout.about_coordinatorlayout);
+
+ // We need to use the SupportActionBar from android.support.v7.app.ActionBar until the minimum API is >= 21.
+ Toolbar aboutAppBar = (Toolbar) findViewById(R.id.about_toolbar);
+ setSupportActionBar(aboutAppBar);
+
+ // Display the home arrow on supportAppBar.
+ final ActionBar appBar = getSupportActionBar();
+ assert appBar != null;// This assert removes the incorrect warning in Android Studio on the following line that appBar might be null.
+ appBar.setDisplayHomeAsUpEnabled(true);