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android:id="@+id/frag_container_"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
</LinearLayout>

마) activity_select_subject3.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:sl="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#FFFFFF"
tools:context="com.helloworld.smartschool.SelectSubject3">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">

<!-- 화면에 맞추기 위해 ScalableLayout 사용-->
<com.ssomai.android.scalablelayout.ScalableLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
sl:scale_base_width="1080"
sl:scale_base_height="300">

<!--50m 달리기 선택 버튼-->
<Button
android:id="@+id/btn_R50"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:text="50m"
android:textColor="#FFFFFF"
android:textStyle="bold"
android:background="#79DDAD"
sl:scale_width="320"
sl:scale_height="150"
sl:scale_textsize="60"
sl:scale_top="50"
sl:scale_left="40"/>

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