Title, etc. not showing in Android Toolbar

Question

I\'ve just added an Android Toolbar to an app I\'m working on. The toolbar placement works correctly with the toolbar layout appearing at the top of the display. However,

Answer 1

Tutorial: http://www.viralandroid.com/2015/08/android-toolbar-example.html

styles.xml

layout file

java

Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);