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

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

    <LinearLayout
        android:id="@+id/loader_progress"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center">

        <ProgressBar
            style="?android:attr/progressBarStyleLarge"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center" />

    </LinearLayout>

    <FrameLayout
        android:id="@+id/loader_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:visibility="gone">

    </FrameLayout>

</FrameLayout>