Android layout: layer layout

add the layer layout code to see how it works.
experiment code:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
    <TextView
        android:layout_width="240dp"
        android:layout_height="240dp"
        android:background="#ff0000"
        android:layout_gravity="center"
/>
    <TextView
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:background="#ffff00"
        android:layout_gravity="center"
/>
    <TextView
        android:layout_width="160dp"
        android:layout_height="160dp"
        android:background="#00ff00"
        android:layout_gravity="center"
/>
    <TextView
        android:layout_width="120dp"
        android:layout_height="120dp"
        android:background="#00ffff"
        android:layout_gravity="center"
/>
    <TextView
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:background="#0000ff"
        android:layout_gravity="center"
/>
</FrameLayout>

experimental results :


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