android/WALT/app/src/main/res/layout/line_chart.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"
    android:layout_margin="5dp"
    android:background="@drawable/border"
    android:visibility="gone">
    <com.github.mikephil.charting.charts.LineChart
        android:id="@+id/chart"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_margin="10dp"
        android:gravity="bottom" />
    <Button
        android:id="@+id/button_close_chart"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:tint="@color/button_tint"
        android:layout_margin="5dp"
        android:text="Close" />
</RelativeLayout>