使用Python+Kivy编写一段Android手机的蓝牙收发程序

以下是一个简单的使用Python+Kivy编写的Android手机蓝牙收发程序示例：

# 导入必要的模块
import bluetooth
from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.textinput import TextInput
from kivy.uix.boxlayout import BoxLayout

class BluetoothApp(App):
    def __init__(self):
        super().__init__()
        self.server_sock = None
        self.client_sock = None
        self.client_info = None

    def start_server(self):
        # 启动蓝牙服务端
        self.server_sock = bluetooth.BluetoothSocket(bluetooth.RFCOMM)
        self.server_sock.bind(("", bluetooth.PORT_ANY))
        self.server_sock.listen(1)
        port = self.server_sock.getsockname()[1]
        uuid = "00001101-0000-1000-8000-00805F9B34FB"
        bluetooth.advertise_service(self.server_sock, "BluetoothServer", service_id=uuid, service_classes=[uuid, bluetooth.SERIAL_PORT_CLASS], profiles=[bluetooth.SERIAL_PORT_PROFILE])
        print("等待客户端连接...")
        self.client_sock, self.client_info = self.server_sock.accept()
        print("客户端已连接：", self.client_info)

    def stop_server(self):
        # 停止蓝牙服务端
        if self.client_sock:
            self.client_sock.close()
            self.client_sock = None
        if self.server_sock:
            self.server_sock.close()
            self.server_sock = None
            print("服务端已关闭")

    def send_data(self, data):
        # 发送数据
        if self.client_sock:
            self.client_sock.send(data.encode("utf-8"))

    def receive_data(self):
        # 接收数据
        if self.client_sock:
            data = self.client_sock.recv(1024)
            return data.decode("utf-8")
        return ""

    def build(self):
        # 构建界面
        layout = BoxLayout(orientation="vertical")

        # 输入框
        self.text_input = TextInput()
        layout.add_widget(self.text_input)

        # 发送按钮
        self.send_button = Button(text="发送")
        self.send_button.bind(on_press=self.on_send_button_pressed)
        layout.add_widget(self.send_button)

        # 接收框
        self.text_output = TextInput(readonly=True)
        layout.add_widget(self.text_output)

        # 启动按钮
        self.start_button = Button(text="启动服务端")
        self.start_button.bind(on_press=self.on_start_button_pressed)
        layout.add_widget(self.start_button)

        # 停止按钮
        self.stop_button = Button(text="停止服务端")
        self.stop_button.bind(on_press=self.on_stop_button_pressed)
        layout.add_widget(self.stop_button)

        return layout

    def on_start_button_pressed(self, instance):
        # 启动服务端
        self.start_server()

    def on_stop_button_pressed(self, instance):
        # 停止服务端
        self.stop_server()

    def on_send_button_pressed(self, instance):
        # 发送数据
        data = self.text_input.text
        self.send_data(data)

    def on_update(self, dt):
        # 更新接收框
        data = self.receive_data()
        if data:
            self.text_output.text += data

BluetoothApp().run()

这段程序实现了一个简单的蓝牙收发应用，包括启动、停止服务端、发送数据和接收数据等功能。在界面中，可以输入要发送的数据并通过“发送”按钮发送出去，同时，接收到的数据也会显示在接收框中。同时，该应用也提供了服务端的启动和停止按钮，可以方便地控制服务端的启停。