I think you’re developing for Android Lollipop, but anyway include this line:
<item name="windowActionBar">false</item>
to your theme declaration inside of your app/src/main/res/values/styles.xml
.
Also, if you’re using AppCompatActivity
support library of version 22.1 or greater, add this line:
<item name="windowNoTitle">true</item>
Your theme declaration may look like this after all these additions:
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
</style>