Question

buttonshape.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" >
    <corners
        android:radius="40dp"
        />
    <solid
        android:color="#4F4F4F"
        />
    <padding
        android:left="0dp"
        android:top="0dp"
        android:right="0dp"
        android:bottom="0dp"
        />
    <size
        android:width="80dp"
        android:height="80dp"
        />
    <stroke
        android:width="3dp"
        android:color="#878787"
        />
</shape>

buttonshape_small

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" >
    <corners
        android:radius="20dp"
        />
    <solid
        android:color="#4F4F4F"
        />
    <padding
        android:left="0dp"
        android:top="0dp"
        android:right="0dp"
        android:bottom="0dp"
        />
    <size
        android:width="40dp"
        android:height="40dp"
        />
    <stroke
        android:width="3dp"
        android:color="#878787"
        />
</shape>

layout.xml

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

    <Button
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:text="XX"
        android:id="@+id/button2"
        android:layout_gravity="center_horizontal"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true"
        android:background="@drawable/buttonshape"/>

    <Button
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:text="YY"
        android:id="@+id/button3"
        android:layout_marginBottom="54dp"
        android:layout_above="@+id/button2"
        android:layout_centerHorizontal="true"
        android:background="@drawable/buttonshape_small"
        android:textSize="9sp" />

    <Button
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:text="YY"
        android:id="@+id/button4"
        android:background="@drawable/buttonshape_small"
        android:textSize="9sp"
        android:layout_below="@+id/button2"
        android:layout_alignLeft="@+id/button3"
        android:layout_alignStart="@+id/button3"
        android:layout_marginTop="45dp" />

    <Button
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:text="YY"
        android:id="@+id/button5"
        android:background="@drawable/buttonshape_small"
        android:textSize="9sp"
        android:layout_above="@+id/button2"
        android:layout_toLeftOf="@+id/button2"
        android:layout_toStartOf="@+id/button2"
        android:layout_marginRight="44dp"
        android:layout_marginEnd="44dp" />

    <Button
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:text="YY"
        android:id="@+id/button6"
        android:background="@drawable/buttonshape_small"
        android:textSize="9sp"
        android:layout_above="@+id/button4"
        android:layout_alignLeft="@+id/button5"
        android:layout_alignStart="@+id/button5" />

    <Button
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:text="YY"
        android:id="@+id/button7"
        android:background="@drawable/buttonshape_small"
        android:textSize="9sp"
        android:layout_above="@+id/button4"
        android:layout_toRightOf="@+id/button2"
        android:layout_toEndOf="@+id/button2"
        android:layout_marginLeft="47dp"
        android:layout_marginStart="47dp" />

    <Button
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:text="YY"
        android:id="@+id/button8"
        android:background="@drawable/buttonshape_small"
        android:textSize="9sp"
        android:layout_above="@+id/button2"
        android:layout_alignLeft="@+id/button7"
        android:layout_alignStart="@+id/button7" />
</RelativeLayout>