安卓蓝牙获取连接设备

Question

无论配置文件如何，我如何获取所有连接的 Android 蓝牙设备的列表？

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。 .

我想我可以通过 ACTION_ACL_CONNECTED 监听连接/断开连接来查看哪些设备已连接/ACTION_ACL_DISCONNECTED ...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. 获取当前配对设备的列表
2. 扫描或发现范围内的所有其他对象

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
    }
}

发现是一个更复杂的操作。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 BluetoothAdapter 开始扫描:

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

btAdapter.startDiscovery();