第二次作业

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
    android:background="#01ffff">

    <Button
        android:id="@+id/button"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:background="#000000"


        />

    <Button
        android:id="@+id/button2"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:layout_above="@id/button"
        android:layout_centerHorizontal="true"
        android:background="#fe1595"
        />

    <Button
        android:id="@+id/button3"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:layout_toLeftOf="@id/button2"
        android:layout_above="@id/button"
        android:background="#FFFFFF" />


    <Button
        android:id="@+id/button4"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:layout_above="@id/button"
        android:layout_toRightOf="@id/button2"
        android:background="#FFFF00"
        />

    <Button
        android:id="@+id/button5"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:layout_below="@id/button2"
        android:layout_toLeftOf="@id/button"
        android:background="#008000"
        />

    <Button
        android:id="@+id/button6"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:layout_toRightOf="@id/button"
        android:layout_below="@id/button4"
        android:background="#0001cb"
        />

    <Button
        android:id="@+id/button7"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:layout_below="@id/button"
        android:layout_toLeftOf="@id/button"
        android:background="#fe0000"
        />

    <Button
        android:id="@+id/button8"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:layout_toRightOf="@id/button7"
        android:layout_below="@id/button"
        android:background="#483D8B"
        />

    <Button
        android:id="@+id/button9"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:layout_below="@id/button"
        android:layout_toRightOf="@id/button8"
        android:background="#00ff01"
        />


</RelativeLayout>