fedilab-Android-App/app/src/main/res/layouts/mastodon/layout/activity_filters.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_margin="@dimen/fab_margin">
    <!-- RecyclerView for filters -->
    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/lv_filters"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:divider="@null"
        android:scrollbars="none" />

    <RelativeLayout
        android:id="@+id/no_action"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:visibility="gone">

        <TextView
            android:id="@+id/no_action_text"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_gravity="center"
            android:gravity="center"
            android:padding="10dp"
            android:text="@string/action_filters_empty_content"
            android:textSize="20sp" />
    </RelativeLayout>
    <!-- Main Loader -->
    <RelativeLayout
        android:id="@+id/loader"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:visibility="gone">

        <ProgressBar
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:indeterminate="true" />
    </RelativeLayout>

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/add_filter"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentBottom="true"
        android:layout_gravity="bottom|end"
        android:layout_margin="@dimen/fab_margin"
        android:contentDescription="@string/add_filter"
        android:src="@drawable/ic_baseline_add_24" />
</RelativeLayout>