Gadgetbridge/app/src/main/res/layout/fragment_live_activity.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:grid="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    grid:columnCount="2">

    <nodomain.freeyourgadget.gadgetbridge.activities.charts.CustomBarChart
        android:id="@+id/livechart_steps_per_minute_current"
        grid:layout_columnWeight="1"
        grid:layout_rowWeight="1"></nodomain.freeyourgadget.gadgetbridge.activities.charts.CustomBarChart>

    <nodomain.freeyourgadget.gadgetbridge.activities.charts.CustomBarChart
        android:id="@+id/livechart_steps_total"
        grid:layout_columnWeight="1"
        grid:layout_rowWeight="1"></nodomain.freeyourgadget.gadgetbridge.activities.charts.CustomBarChart>

    <!--
        <com.github.mikephil.charting.charts.PieChart
            android:id="@+id/livechart_steps_total"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_weight="20">
        </com.github.mikephil.charting.charts.PieChart>

        <com.github.mikephil.charting.charts.PieChart
            android:id="@+id/livechart_steps_per_minute_current"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_weight="20">
        </com.github.mikephil.charting.charts.PieChart>
-->

    <com.github.mikephil.charting.charts.LineChart
        android:id="@+id/livechart_steps_per_minute_history"
        grid:layout_columnSpan="2"
        grid:layout_columnWeight="1"
        grid:layout_rowWeight="1"></com.github.mikephil.charting.charts.LineChart>


</android.support.v7.widget.GridLayout>