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1.JiuGongGe 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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