fedilab-Android-App/app/src/main/res/layout/tab_custom_default_view.xml

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

    <androidx.appcompat.widget.AppCompatImageView
        android:id="@+id/icon"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true" />

    <TextView
        android:id="@+id/tab_counter"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignTop="@+id/icon"
        android:layout_alignEnd="@+id/icon"
        android:layout_alignParentTop="true"
        android:layout_alignParentEnd="true"
        android:background="@drawable/shape_counter"
        android:paddingLeft="2dp"
        android:paddingRight="2dp"
        android:textColor="?mTextColor"
        android:textSize="12sp"
        android:visibility="gone"
        tools:text="35"
        tools:visibility="visible" />
</RelativeLayout>