책이랑 똑같이 했는데 왜 안될까요


<?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" android:baselineAligned="true"> <Button android:layout_id="@+/button" android:layout_width="match_parent" android:layout_height="match_parent" android:text="button" android:background="#ff0088ff" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" android:layout_above="@+id/button2"/> <Button android:id="@+id/button2" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Button" android:layout_alignParentBottom="true" android:layout_alignParentStart="true"/> <Button android:id="@+id/button3" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentStart="true" android:layout_alignParentTop="true" android:text="Button"/> </RelativeLayout> <!--?xml version="1.0" encoding="utf-8"?-->



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