<?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:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/testtap"
        android:textSize="30sp"
        app:layout_constraintHorizontal_bias="0.501"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="52dp"
        android:layout_marginEnd="13dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="13dp"
        android:layout_marginStart="8dp"
        android:onClick="onClickButton"
        android:text="Activity"
        app:layout_constraintBaseline_toBaselineOf="@+id/button3"
        app:layout_constraintEnd_toStartOf="@+id/button3"
        app:layout_constraintHorizontal_chainStyle="packed"
        app:layout_constraintStart_toStartOf="parent" />

    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="57dp"
        android:layout_marginTop="12dp"
        android:onClick="ChangeFragment"
        android:text="MainFragment"
        app:layout_constraintEnd_toStartOf="@+id/button4"
        app:layout_constraintStart_toEndOf="@+id/button2"
        app:layout_constraintTop_toBottomOf="@+id/textView" />

    <Button
        android:id="@+id/button4"
        android:layout_width="wrap_content"
        android:layout_height="55dp"
        android:onClick="ChangeFragment"
        android:text="SubFragment"
        app:layout_constraintBaseline_toBaselineOf="@+id/button3"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@+id/button3" />

    <fragment
        android:id="@+id/fragment_place"
        android:name="com.example.nitta_lab_2.myapplication.MainFragment"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginBottom="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button3" />

</android.support.constraint.ConstraintLayout>