现在，怎样将这个小程序制作成安卓手机APP

要将Kivy应用程序打包成Android应用程序，需要使用Buildozer工具。Buildozer是一个命令行工具，可以自动化构建和打包Python应用程序，并生成APK文件。 以下是在Ubuntu上安装Buildozer的步骤： 1. 安装依赖项 ``` sudo apt-get update sudo apt-get install -y python3-pip build-essential git python3-setuptools libffi-dev sudo apt-get install -y libssl-dev libsqlite3-dev libreadline-dev libbz2-dev sudo apt-get install -y python3-venv openjdk-8-jdk unzip ``` 2. 安装Buildozer ``` pip3 install --user buildozer ``` 3. 初始化Buildozer ``` buildozer init ``` 这将创建一个名为buildozer.spec的配置文件，其中包含有关应用程序的信息和构建选项。 4. 编辑配置文件 打开buildozer.spec文件并编辑以下行： ``` # (str) Title of your application title = Calculator # (str) Package name package.name = calculator # (str) Package domain (needed for android/ios packaging) package.domain = org.example # (str) Source code where the main.py live source.dir = . # (list) Application requirements requirements = kivy # (str) Android API to use android.api = 27 # (int) Minimum API required android.minapi = 21 # (int) Android SDK version to use android.sdk = 27 # (str) Android NDK version to use android.ndk = 19b # (str) Android NDK directory (if empty, it will be automatically downloaded.) android.ndk_path = # (str) Android SDK directory (if empty, it will be automatically downloaded.) android.sdk_path = # (str) Gradle version to use android.gradle = 4.10.3 # (list) Permissions android.permissions = INTERNET # (str) Path to a custom buildozer.spec file # /buildozer.spec #spec = %(source.dir)s/buildozer.spec # (str) Path to a