This is my menu-main.xml.
The picture below the code shows where I want to put the logo on my app.
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
tools:context="com.example.akam.billettogram.MainActivity">**strong text**
<item
android:id="@+id/logo"
app:showAsAction="always"
android:title=""
android:layout_gravity="center"
android:icon="@drawable/logo"/>
<item
android:id="@+id/action_settings"
android:orderInCategory="100"
android:title="@string/action_settings"
app:showAsAction="never"/>
</menu>