Key preview for the System Keyboard tutorial on the SSaurel's Channel

key_preview.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:background="@android:color/white"
    android:textColor="@color/colorPrimary"
    android:textSize="30sp">
</TextView>