tab_button1.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    tools:ignore="contentDescription"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_gravity="bottom"
    android:paddingTop="6dp"
    android:paddingBottom="6dp">

    <ImageView
        android:id="@+id/tab_icon"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:background="@color/transparent"
        android:focusable="false"
        android:paddingTop="15dp"/>

</RelativeLayout>