android - Android 蓝牙连接设备

Question

无论配置文件如何，如何获取所有已连接的 Android 蓝牙设备列表？

或者，我看到您可以通过BluetoothManager.getConnectedDevices获取特定配置文件的所有连接设备。

而且我想我可以通过ACTION_ACL_CONNECTED / ACTION_ACL_DISCONNECTED监听连接/断开连接来查看连接了哪些设备......似乎容易出错。

但我想知道是否有更简单的方法来获取所有连接的蓝牙设备的列表。

Answer 1

要查看完整列表，这是一个两步操作：

1. 获取当前配对设备列表
2. 扫描或发现范围内的所有其他人

要获取并迭代当前配对设备的列表：

Set<BluetoothDevice> pairedDevices = BluetoothAdapter.getDefaultAdapter().getBondedDevices();
if (pairedDevices.size() > 0) {
    for (BluetoothDevice d: pairedDevices) {
        String deviceName = d.getName();
        String macAddress = d.getAddress();
        Log.i(LOGTAG, "paired device: " + deviceName + " at " + macAddress);
        // do what you need/want this these list items
    }
}

发现是一个稍微复杂一点的操作。为此，您需要告诉 BluetoothAdapter 开始扫描/发现。当它找到东西时，它会发出您需要使用 BroadcastReceiver 接收的 Intent。

首先，我们将设置接收器：

private void setupBluetoothReceiver()
{
    BroadcastRecevier btReceiver = new BroadcastReciver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            handleBtEvent(context, intent);
        }
    };
    IntentFilter eventFilter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
    // this is not strictly necessary, but you may wish
    //  to know when the discovery cycle is done as well
    eventFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
    myContext.registerReceiver(btReceiver, eventFilter);
}

private void handleBtEvent(Context context, Intent intent)
{
    String action = intent.getAction();
    Log.d(LOGTAG, "action received: " + action);

    if (BluetoothDevice.ACTION_FOUND.equals(action)) {
        BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
        Log.i(LOGTAG, "found device: " + device.getName());
    } else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
        Log.d(LOGTAG, "discovery complete");
    }
}

现在剩下的就是告诉蓝牙适配器开始扫描：

BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter();
// if already scanning ... cancel
if (btAdapter.isDiscovering()) {
    btAdapter.cancelDiscovery();
}

btAdapter.startDiscovery();

Answer 2

这就是您获得“连接”设备的方式，而不仅仅是配对设备。无需检查它的进一步状态。

val btManager = view.getSystemService(BLUETOOTH_SERVICE) as BluetoothManager
val connectedDevices = btManager.getConnectedDevices(GATT)

Answer 3

获取连接设备的最佳方法如下：

1. 配对设备

   val btManager = baseContext.getSystemService(BLUETOOTH_SERVICE) as BluetoothManager
   val pairedDevices = btManager.adapter.bondedDevices
   
   if (pairedDevices.size > 0) {
   
       for (device in pairedDevices) {
           val deviceName = device.name
           val macAddress = device.address
           val aliasing = device.alias
   
           Log.i(
               " pairedDevices ",
               "paired device: $deviceName at $macAddress + $aliasing " + isConnected(device)
           )
       }
   }
   

2. 检查任何连接或没有。

要检查配对设备是否已连接，您需要使用此方法：

private fun isConnected(device: BluetoothDevice): Boolean {
    return try {
        val m: Method = device.javaClass.getMethod("isConnected")
        m.invoke(device) as Boolean
    } catch (e: Exception) {
        throw IllegalStateException(e)
    }
}

参考这里。