tests/MotionPrediction/res/layout/activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
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     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="test.motionprediction.MainActivity">

    <test.motionprediction.DrawingView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/output" />

</LinearLayout>