<?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">

    <FrameLayout
        android:id="@+id/main"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    </FrameLayout>

    <ImageButton
        android:id="@+id/record"
        android:layout_width="56dp"
        android:layout_height="56dp"
        android:layout_alignParentBottom="true"
        android:layout_alignParentEnd="true"
        android:layout_margin="16dp"
        android:elevation="4dp"
        android:background="@drawable/action_button"
        android:src="@drawable/ic_videocam_white"/>
</RelativeLayout>
<?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">

    <FrameLayout
        android:id="@+id/main"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    </FrameLayout>

    <ImageButton
        android:id="@+id/record"
        android:layout_width="64dp"
        android:layout_height="64dp"
        android:layout_alignParentBottom="true"
        android:layout_alignParentEnd="true"
        android:layout_margin="24dp"
        android:elevation="4dp"
        android:background="@drawable/action_button"
        android:src="@drawable/ic_videocam_white"/>
</RelativeLayout>
Make action button a bit bigger
Make action button a bit bigger
