安卓第四周作业

activity_main.xml

 

 

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

 

    android:layout_width="match_parent"

    android:layout_height="match_parent">

 

    <Button

        android:id="@+id/button1"

        android:layout_width="100dp"

        android:layout_height="100dp"

        android:background="#000000"

        android:layout_centerInParent="true"

        android:text=""

         />

    <Button

        android:id="@+id/button2"

        android:layout_width="100dp"

        android:layout_height="100dp"

        android:background="#FF0000"

        android:layout_toLeftOf="@id/button1"

        android:layout_centerInParent="true"

        android:text=""

        />

    <Button

        android:id="@+id/button3"

        android:layout_width="100dp"

        android:layout_height="100dp"

        android:background="#0000FF"

        android:layout_toRightOf="@id/button1"

        android:layout_centerInParent="true"

        android:text=""

        />

    <Button

        android:id="@+id/button4"

        android:layout_width="100dp"

        android:layout_height="100dp"

        android:background="#00FF00"

        android:layout_above="@id/button1"

        android:layout_centerInParent="true"

        android:text=""

        />

    <Button

        android:id="@+id/button5"

        android:layout_width="100dp"

        android:layout_height="100dp"

        android:background="#FFFF00"

        android:layout_toLeftOf="@+id/button4"

        android:layout_above="@id/button2"

        android:layout_centerInParent="true"

        android:text=""

        />

    <Button

        android:id="@+id/button6"

        android:layout_width="100dp"

        android:layout_height="100dp"

        android:background="#00FFFF"

        android:layout_toRightOf="@+id/button4"

        android:layout_above="@id/button3"

        android:layout_centerInParent="true"

        android:text=""

        />

    <Button

        android:id="@+id/button7"

        android:layout_width="100dp"

        android:layout_height="100dp"

        android:background="#FF0FFF"

        android:layout_below="@id/button1"

        android:layout_centerInParent="true"

        android:text=""

        />

    <Button

        android:id="@+id/button8"

        android:layout_width="100dp"

        android:layout_height="100dp"

        android:background="#0FFFFF"

        android:layout_below="@id/button2"

        android:layout_toLeftOf="@id/button7"

        android:layout_centerInParent="true"

        android:text=""

        />

    <Button

        android:id="@+id/button9"

        android:layout_width="100dp"

        android:layout_height="100dp"

        android:background="#FFFF00"

        android:layout_toRightOf="@+id/button4"

        android:layout_below="@id/button3"

        android:layout_centerInParent="true"

        android:text=""

        />

 

 

</RelativeLayout>

　　

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MainActivity.java   无添加