如何在suspendCancellableCoroutine中接收BroadcastReceiver消息

Question

我编写了以下代码来实现绑定蓝牙设备并获取蓝牙设备绑定状态，但是我无法接收BroadcastReceiver消息，

Log.e("Bluetooth", "onReceive")

永远不会登录！

@SuppressLint("MissingPermission")
suspend fun Context.obtainBluetoothDeviceBondState(): Boolean {
    return suspendCancellableCoroutine { continuation ->
        val receiver = object : BroadcastReceiver() {
            override fun onReceive(context: Context?, intent: Intent?) {
                Log.e("Bluetooth", "onReceive")
                if (BluetoothDevice.ACTION_BOND_STATE_CHANGED == intent?.action) {
                    val device = intent.getParcelableExtra<BluetoothDevice>(BluetoothDevice.EXTRA_DEVICE)
                    val bondState = intent.getIntExtra(BluetoothDevice.EXTRA_BOND_STATE, BluetoothDevice.BOND_NONE)
                    if (macAddress == device?.address) {
                        when (bondState) {
                            BluetoothDevice.BOND_BONDED -> {
                                Log.e("Bluetooth", "bond bluetooth device success")
                                unregisterReceiver(this)
                                continuation.resume(true)
                            }

                            BluetoothDevice.BOND_NONE -> {
                                Log.e("Bluetooth", "bond bluetooth device failed")
                                unregisterReceiver(this)
                                continuation.resume(false)
                            }
                        }
                    }
                }
            }
        }

        continuation.invokeOnCancellation {
            Log.e("Bluetooth", "unregisterReceiver")
            unregisterReceiver(receiver)
        }

        Log.e("Bluetooth", "registerReceiver")
        ContextCompat.registerReceiver(
            this, receiver, IntentFilter(BluetoothDevice.ACTION_BOND_STATE_CHANGED), ContextCompat.RECEIVER_NOT_EXPORTED
        )

        val bluetoothManager = getSystemService(Context.BLUETOOTH_SERVICE) as BluetoothManager
        if (!bluetoothManager.adapter.bondBluetoothDevice(macAddress)) {
            continuation.resume(false)
        }
    }
}

@SuppressLint("MissingPermission")
fun BluetoothAdapter.bondBluetoothDevice(macAddress: String) = getRemoteDevice(macAddress).createBond()

kotlin版本是1.9.24，kotlin协程jvm版本和kotlin协程android版本只是1.6.4

我不知道为什么我没有收到BroadcastReceiver消息。有人有想法吗？

Answer 1

为了确保您的 BroadcastReceiver 可以接收系统事件，请使用 ContextCompat.RECEIVER_EXPORTED 标志而不是 ContextCompat.RECEIVER_NOT_EXPORTED 来注册它。这允许接收器监听来自其他应用程序和 Android 系统的广播。

使用

ContextCompat.registerReceiver(this, receiver, IntentFilter(BluetoothDevice.ACTION_BOND_STATE_CHANGED), ContextCompat.RECEIVER_EXPORTED)

而不是

ContextCompat.registerReceiver(this, receiver, IntentFilter(BluetoothDevice.ACTION_BOND_STATE_CHANGED), ContextCompat.RECEIVER_NOT_EXPORTED)