安卓第四周作业

<?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">

 

 

    <Button

        android:id="@+id/a1"

        android:layout_width="100dp"

        android:layout_height="100dp"

        android:layout_centerInParent="true"

        android:background="#FF7F24"

        />

 

    <Button

        android:id="@+id/a2"

        android:layout_width="100dp"

        android:layout_height="100dp"

        android:layout_above="@id/a1"

        android:layout_alignRight="@+id/a1"

        android:background="#BF3EFF"

        />

 

    <Button

        android:id="@+id/a3"

        android:layout_width="100dp"

        android:layout_height="100dp"

        android:layout_below="@id/a1"

        android:layout_alignRight="@+id/a1"

        android:background="#B8860B"

        />

 

    <Button

        android:id="@+id/a4"

        android:layout_width="100dp"

        android:layout_height="100dp"

        android:layout_above="@id/a1"

        android:layout_toLeftOf="@+id/a1"

        android:background="#969696"

        />

 

    <Button

        android:id="@+id/a5"

        android:layout_width="100dp"

        android:layout_height="100dp"

        android:layout_above="@id/a1"

        android:layout_toRightOf="@+id/a1"

        android:background="#7CFC00"

        />

 

    <Button

        android:id="@+id/a6"

        android:layout_width="100dp"

        android:layout_height="100dp"

        android:layout_below="@id/a1"

        android:layout_toLeftOf="@+id/a1"

        android:background="#303030"

        />

 

    <Button

        android:id="@+id/a7"

        android:layout_width="100dp"

        android:layout_height="100dp"

        android:layout_below="@id/a1"

        android:layout_toRightOf="@+id/a1"

        android:background="#0000FF"

        />

 

    <Button

        android:id="@+id/a8"

        android:layout_width="100dp"

        android:layout_height="100dp"

        android:layout_toLeftOf="@id/a1"

        android:layout_alignBottom="@+id/a1"

        android:background="#A0522D"

        />

 

    <Button

        android:id="@+id/a9"

        android:layout_width="100dp"

        android:layout_height="100dp"

        android:layout_toRightOf="@id/a1"

        android:layout_alignBottom="@+id/a1"

        android:background="#CD00CD"

        />

 

 

    

 

</RelativeLayout>