AndroidAPS/app/src/main/res/layout/overview_graphs_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        android:layout_weight="1">

        <com.jjoe64.graphview.GraphView
            android:id="@+id/bg_graph"
            android:layout_width="wrap_content"
            android:layout_height="200dp" />

        <ImageButton
            android:id="@+id/chart_menu_button"
            android:layout_width="30dp"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:layout_alignParentEnd="true"
            android:contentDescription="@string/chart_menu"
            android:paddingTop="5dp"
            app:srcCompat="@drawable/ic_arrow_drop_down_white_24dp" />

        <TextView
            android:id="@+id/iob_calculation_progress"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:textAppearance="@style/TextAppearance.AppCompat.Medium"
            tools:ignore="RelativeOverlap" />

    </RelativeLayout>

    <LinearLayout
        android:id="@+id/iob_graph"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" />

</LinearLayout>