使用python写一个安卓app

要使用 Python 编写安卓应用程序，你可以使用 Kivy 框架。Kivy 是一个开源的 Python 应用程序开发框架，可以帮助你创建跨平台的移动应用程序，包括 Android、iOS 和 Windows。

以下是使用 Kivy 创建一个简单的安卓应用程序的步骤：

1. 安装 Kivy

使用 pip 命令安装 Kivy：

pip install kivy

2. 创建应用程序

创建一个名为 main.py 的 Python 文件，并在其中编写应用程序的代码。例如，以下代码创建一个简单的应用程序，显示一个标签和一个按钮：

import kivy
from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.button import Button

class MyApp(App):
    def build(self):
        label = Label(text="Hello, world!")
        button = Button(text="Click me!")
        return label, button

if __name__ == "__main__":
    MyApp().run()

3. 构建 APK 文件

使用 Buildozer 工具将 Python 代码打包成 APK 文件。Buildozer 是一个开源的 Python 工具，可帮助你构建 Android 应用程序。

首先安装 Buildozer：

pip install buildozer

然后在应用程序目录中创建一个名为 buildozer.spec 的文件，其中包含应用程序的配置信息。以下是一个示例文件：

[app]

# (str) Title of your application
title = My Application

# (str) Package name
package.name = myapp

# (str) Package domain (needed for android/ios packaging)
package.domain = org.example.myapp

# (str) Source code where the main.py live
source.dir = .

# (list) Source files to include (let empty to include all the files)
source.include_exts = py,png,jpg,kv,atlas

# (list) Application requirements
# comma separated e.g. requirements = sqlite3,kivy
requirements = kivy

[buildozer]

# (int) Log level (0 = error only, 1 = info, 2 = debug (with command line option -v))
log_level = 1

# (str) Path to build artifact storage, absolute or relative to spec file
# build_dir = ./.buildozer

# (str) Path to build output (i.e. .apk, .ipa) storage
# bin_dir = ./bin

# (str) Path to build output for debug builds (.apk/.ipa)
# debug = ./bin

# (str) Path to build output for release builds (.apk/.ipa)
# release = ./bin

# (list) List of build dependencies (boost, openssl, etc.)
# depends =

# (str) Android NDK version to use
# android.ndk_version = 19b

# (int) Android SDK version to use
# android.sdk_version = 24

# (str) Python for android distribution to use
# python-for-android.branch = master

# (str) python-for-android git clone directory (if not specified, it will be automatically cloned from github)
# python-for-android.source_dir =

# (str) The Android arch to build for, choices: armeabi-v7a, arm64-v8a, x86, x86_64
# arch = armeabi-v7a

# (str) Sequence of toolchain to use, chooses the first one that exists.
# toolchain = gcc

# (str) 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) ANT directory (if empty, it will be automatically downloaded.)
# android.ant_path =

# (str) android api to use
# android.api = 27

# (bool) Use --private data storage (True) or --dir public storage (False)
# android.private_storage = True

# (str) Android NDK directory (if empty, it will be automatically downloaded)
# android.ndk_path = /home/user/android/android-ndk-r19c

# (str) Android SDK directory (if empty, it will be automatically downloaded)
# android.sdk_path = /home/user/android/android-sdk-24

# (str) Build platform for python-for-android (ios, android, manylinux2010)
# p4a.build_platform = android

# (str) Path to a custom AndroidManifest.xml
# android.manifest =

# (str) Path to a custom source.properties
# android.source_properties =

# (str) Path to a custom ant.properties
# android.ant_properties =

# (str) Path to a custom androidtool.cfg
# android.androidtool_cfg =

# (str) Path to the android command to use.
# android.cmd = adb

最后，使用 Buildozer 命令打包 APK 文件：

buildozer android debug

4. 运行应用程序

在 Android 设备上安装 APK 文件，并启动应用程序。你应该可以看到一个显示标签和按钮的屏幕。

以上就是使用 Python 创建安卓应用程序的基本步骤。你可以在 Kivy 文档中找到更多相关信息。