open-keychain/OpenKeychain/src/main/res/layout/main_activity.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v7.widget.Toolbar
        android:id="@+id/activity_main_toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:elevation="4dp"
        android:background="?attr/colorPrimary"/>

    <FrameLayout
        android:id="@+id/main_fragment_container"
        android:layout_gravity="center"
        android:layout_height="match_parent"
        android:layout_width="match_parent"/>

</LinearLayout>