使用pyjnius Java包装器进行Python蓝牙设备扫描

编程问答 2022-08-12

问题描述

我正在尝试复制下面的Java代码，该代码应该在android设备上扫描蓝牙设备，但是我正在尝试使用pyjnius java到python包装器在python中编写代码。

关于如何执行此操作的文档很少，因此我无法弄清楚如何使其工作，查看Java代码，似乎onReceive类中的功能broadcastReceiver被覆盖，但不是确定如何在python中做到这一点。当前，代码只是失败而没有任何调用回溯，所以我什至无法调试它。

感谢您的帮助

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)

解决方法

我使用BroadcastReceiver进行WiFi扫描，它可以正常工作，您应该可以将此示例改编为蓝牙。

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

这是在“问题”中，因为BroadcastReceiver中存在崩溃错误，该崩溃错误是在第二次启动时发生的，例如从on_resume（）开始。该修复程序将在第二篇文章中进行介绍，并且需要克隆p4a的本地副本，按照说明进行编辑，然后在.spec中使用p4a.source_dir

指向它。
androidandroidbluetoothpyjniuspython