使用 pyjnius java wrapper 的 Python 蓝牙设备扫描

Posted 2023-04-14

【中文标题】使用 pyjnius java wrapper 的 Python 蓝牙设备扫描

【英文标题】：Python bluetooth device scanning using pyjnius java wrapper

【发布时间】：2020-12-22 18:56:47

【问题描述】：

我正在尝试复制下面的代码，该代码应该在 android 设备上扫描蓝牙设备，但我正在尝试使用 pyjnius java to python 包装器在 python 中编写它。

关于如何做到这一点的文档很少，所以我无法弄清楚如何让它工作，查看 java 代码似乎函数 onReceive 在 BroadcastReceiver 类中被覆盖但不知道该怎么做在python中。目前代码只是在没有任何调用回溯的情况下失败，所以我什至无法调试它。

感谢任何帮助

Java 蓝牙代码

 mBluetoothAdapter.startDiscovery();
 mReceiver = new BroadcastReceiver() 
 public void onReceive(Context context, Intent intent) 
     String action = intent.getAction();

     //Finding devices
     if (BluetoothDevice.ACTION_FOUND.equals(action))
     
         // Get the BluetoothDevice object from the Intent
         BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
         // Add the name and address to an array adapter to show in a ListView
        mArrayAdapter.add(device.getName() + "\n" + device.getAddress());
     
   
 ;

 IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
 registerReceiver(mReceiver, filter);

python 代码

from android.broadcast import BroadcastReceiver
from jnius import autoclass
from android.permissions import request_permissions, Permission

BluetoothAdapter = autoclass('android.bluetooth.BluetoothAdapter')
BluetoothDevice = autoclass('android.bluetooth.BluetoothDevice')
BluetoothSocket = autoclass('android.bluetooth.BluetoothSocket')
BroadcastReceiver = autoclass('android.content.BroadcastReceiver')
IntentFilter = autoclass('android.content.IntentFilter')
Intent = autoclass('android.content.Intent')


request_android_permissions()
mBLuetoothAdapter = BluetoothAdapter.getDefaultDevice()
mBLuetoothAdapter.startDiscovery()

mReceiver = BroadcastReceiver(self.on_broadcast, actions = ['ACTION.FOUND'])
mReceiver.start()

def request_android_permissions():
    def callback(permissions, results):
        if all([res for res in results]):
            print("callback. All permissions granted")
        else:
            print("callback. Some permissions refused")

    request_permissions([Permission.ACCESS_COARSE_LOCATION, Permission.ACCESS_FINE_LOCATION])

def onReceive(context, intent):
    action = intent.getAction()
    
    if BluetoothDevice.ACTION_FOUND.equals(action):
        device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE)
        Devices.append(device.getName() + "  " + device.getAddress())

filter = IntentFilter(BluetoothDevice.ACTION_FOUND)
BroadcastReceiver.registerReceiver(mReceiver, filter)

【参考方案1】：

我使用 BroadcastReceiver 进行 WiFi 扫描，它可以工作，您应该可以将此示例用于蓝牙。

https://github.com/kivy/python-for-android/issues/2308

这是在“问题”中，因为 BroadcastReceiver 中存在一个崩溃错误，该错误发生在第二次启动时，例如来自 on_resume()。该修复在第二篇文章中进行了描述，需要克隆 p4a 的本地副本，按照描述进行编辑，并在 .spec 中使用 p4a.source_dir 指向它