<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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"
    android:theme="@android:style/Theme.NoTitleBar"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <Button
            android:id="@+id/button_start"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="16dp"
            android:layout_marginTop="32dp"
            android:layout_marginRight="16dp"
            android:layout_marginBottom="16dp"
            android:text="@string/button_start"
            android:textSize="18sp" />
    </LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

<!-- 《程式語言教學誌》的範例檔案 -->
<!-- http://kaiching.org/ -->
<!-- 專案：EncryptAndroid -->
<!-- 檔名：activity_main.xml -->
<!-- 作者：張凱慶 -->