<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    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"
    tools:context=".ui.activity.main.MainActivity">

    <include layout="@layout/layout_recyclerview_todolist"/>

    <com.github.clans.fab.FloatingActionButton
        android:id="@+id/floatingactionbutton_todolist"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="@dimen/margin_fab"
        android:src="@drawable/baseline_add_white_24"
        app:fab_colorNormal="@color/colorAccent"
        app:fab_colorPressed="@color/colorAccent"
        app:fab_colorRipple="@color/colorAccent"/>

</android.support.design.widget.CoordinatorLayout>
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    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"
    tools:context=".ui.activity.main.MainActivity">

    <include layout="@layout/layout_recyclerview_todolist"/>

    <com.github.clans.fab.FloatingActionButton
        android:id="@+id/floatingactionbutton_todolist"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="@dimen/margin_fab"
        android:src="@drawable/baseline_add_white_24"
        app:fab_colorNormal="@color/colorAccent"
        app:fab_colorPressed="@color/colorAccent"
        app:fab_colorRipple="@color/colorAccent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"/>

</android.support.constraint.ConstraintLayout>
Modify todo list layout to use ConstraintLayout
Modify todo list layout to use ConstraintLayout
