BroadcastReceiver onReceive() 不适用于使用 Kotlin MVVM 结构的 Fragment

Question

我正在开发一个能够检查所有蓝牙设备的应用程序，并且需要在加载应用程序时将其显示在回收器视图上。我使用

Broadcastreceiver

来搜索设备。但显然，

onReceive()

方法没有触发。

我已经检查过this，但它仍然对我不起作用。

请参阅下面我的代码

广播接收器

class BluetoothBroadcastReceiver(private val listener: Listener) : BroadcastReceiver() {

    constructor() : this(object : Listener {
        override fun onBluetoothDeviceFound(device: BluetoothDevice) {}
        override fun onGpsAction() {}
    })

    interface Listener {
        fun onBluetoothDeviceFound(device: BluetoothDevice)
        fun onGpsAction()
    }

    private val GPS_ACTION = "android.location.PROVIDERS_CHANGED"

    override fun onReceive(context: Context, intent: Intent) {
        val action = intent.action
        if (BluetoothDevice.ACTION_FOUND == action) {
            val btd = intent.getParcelableExtra<BluetoothDevice>(BluetoothDevice.EXTRA_DEVICE)
            if (btd?.bondState != BluetoothDevice.BOND_BONDED) {
                listener.onBluetoothDeviceFound(btd!!)
            }
        } else if (action == GPS_ACTION) {
            listener.onGpsAction()
        }
    }
  }

在

onResume()

上注册接收器

 bluetoothBroadcastReceiver = BluetoothBroadcastReceiver(this)
    val intentFilter = IntentFilter().apply {
        addAction(BluetoothDevice.ACTION_FOUND)
        addAction(GPS_ACTION)
    }
    try{
        LocalBroadcastManager.getInstance(requireContext()).registerReceiver(bluetoothBroadcastReceiver,intentFilter)
        Log.e("intent","register")
    }catch(e: Throwable){
        e.printStackTrace()
    }

在我的片段上实现的监听器

override fun onBluetoothDeviceFound(device: BluetoothDevice) {
    if (!deviceIsExist(device.address)) {
        val name = device.name
        datas.add(BluetoothDeviceDetails(name, device.address, false))
        binding.rvPrinterSettingsList.adapter?.notifyItemChanged(datas.size - 1)
    }
}

override fun onGpsAction() {
    if (isGpsOpen()) {
        setBluetooth()
    }
}

Answer 1

由于您注册的广播是系统级广播（不是您的应用程序本地的广播），因此您需要全局注册

BroadcastReceiver

，而不是通过

LocalBroadcastManager

。

使用 Context.registerReceiver() 代替。