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layout.xml

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

<ScrollView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="center">
    <LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:orientation="vertical">
            <Button
                android:id="@+id/googlePlusButton"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:onClick="onClickStartGoogleOAuth2Flow"
                android:text="@string/googleoauth2_flow" />
            <TextView
                android:id="@+id/text_view"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />
    </LinearLayout>
</ScrollView>