Gadgetbridge/app/src/main/res/layout/activity_fragmentappmanager.xml

<android.widget.RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    tools:context=".activities.appmanager.AppManagerActivity">

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

        <androidx.viewpager.widget.ViewPager
            android:id="@+id/appmanager_pager"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            tools:context=".activities.appmanager.AppManagerActivity">

            <com.google.android.material.tabs.TabLayout
                android:id="@+id/charts_pagerTabStrip"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_gravity="top" />
        </androidx.viewpager.widget.ViewPager>

    </LinearLayout>

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentEnd="true"
        android:layout_gravity="bottom|end"
        app:srcCompat="@drawable/ic_add"
        android:layout_margin="16dp" />

</android.widget.RelativeLayout>