python调用android API

kivy提供了两种方法调用android API——plyer和jnius

plyer 封装了jnius(android)、Pyobjus(ios)和一些桌面系统的API

jnius更为底层，直接调用java api

从这里看，为了更好的跨平台，我们应该尽量使用plyer，但可能api会少一些，一些特定的地方还是要使用jnius去操作。

plyer资料：

https://github.com/kivy/plyer

https://plyer.readthedocs.io

plyer当前版本的api支持情况：

可惜并不支持android蓝牙，所以要操作蓝牙还是得用jnius

以下是网上找到的操作蓝牙代码，先贴着后面再研究

要通过python控制android蓝牙，需先通过Pyjnius去控制android java api…….

蛋疼蛋疼蛋疼，不想写java就是这样~

来自网上的示例：

'''
Bluetooth/Pyjnius example
=========================
This was used to send some bytes to an arduino via bluetooth.
The app must have BLUETOOTH and BLUETOOTH_ADMIN permissions (well, i didn't
tested without BLUETOOTH_ADMIN, maybe it works.)
Connect your device to your phone, via the bluetooth menu. After the
pairing is done, you'll be able to use it in the app.
'''

from jnius import autoclass

BluetoothAdapter = autoclass('android.bluetooth.BluetoothAdapter')
BluetoothDevice = autoclass('android.bluetooth.BluetoothDevice')
BluetoothSocket = autoclass('android.bluetooth.BluetoothSocket')
UUID = autoclass('java.util.UUID')

def get_socket_stream(name):
    paired_devices = BluetoothAdapter.getDefaultAdapter().getBondedDevices().toArray()
    socket = None
    for device in paired_devices:
        if device.getName() == name:
            socket = device.createRfcommSocketToServiceRecord(
                UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"))
            recv_stream = socket.getInputStream()
            send_stream = socket.getOutputStream()
            break
    socket.connect()
    return recv_stream, send_stream

if __name__ == '__main__':
    recv_stream, send_stream = get_socket_stream('linvor')
    send_stream.write('hello\n')
    send_stream.flush()

# Same as before, with a kivy-based UI

'''
Bluetooth/Pyjnius example
=========================
This was used to send some bytes to an arduino via bluetooth.
The app must have BLUETOOTH and BLUETOOTH_ADMIN permissions (well, i didn't
tested without BLUETOOTH_ADMIN, maybe it works.)
Connect your device to your phone, via the bluetooth menu. After the
pairing is done, you'll be able to use it in the app.
'''

from jnius import autoclass

BluetoothAdapter = autoclass('android.bluetooth.BluetoothAdapter')
BluetoothDevice = autoclass('android.bluetooth.BluetoothDevice')
BluetoothSocket = autoclass('android.bluetooth.BluetoothSocket')
UUID = autoclass('java.util.UUID')

def get_socket_stream(name):
    paired_devices = BluetoothAdapter.getDefaultAdapter().getBondedDevices().toArray()
    socket = None
    for device in paired_devices:
        if device.getName() == name:
            socket = device.createRfcommSocketToServiceRecord(
                UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"))
            recv_stream = socket.getInputStream()
            send_stream = socket.getOutputStream()
            break
    socket.connect()
    return recv_stream, send_stream

if __name__ == '__main__':
    kv = '''
BoxLayout:
    Button:
        text: '0'
        on_release: app.reset([b1, b2, b3, b4, b5])
    ToggleButton:
        id: b1
        text: '1'
        on_release: app.send(self.text)
    ToggleButton:
        id: b2
        text: '2'
        on_release: app.send(self.text)
    ToggleButton:
        id: b3
        text: '3'
        on_release: app.send(self.text)
    ToggleButton:
        id: b4
        text: '4'
        on_release: app.send(self.text)
    ToggleButton:
        id: b5
        text: '5'
        on_release: app.send(self.text)
    '''
    from kivy.lang import Builder
    from kivy.app import App

    class Bluetooth(App):
        def build(self):
            self.recv_stream, self.send_stream = get_socket_stream('linvor')
            return Builder.load_string(kv)

        def send(self, cmd):
            self.send_stream.write('{}\n'.format(cmd))
            self.send_stream.flush()

        def reset(self, btns):
            for btn in btns:
                btn.state = 'normal'
            self.send('0\n')

    Bluetooth().run()

所以说现阶段，使用python开发android程序，非但不会方便，还会有各种问题。唯一的好处只是python看着舒服点。