Question

如何在Android上列出所有连接的蓝牙设备？

谢谢！

Answer 1

从API 14（Ice Cream）开始，Android有一些新的BluetoothAdapter方法，包括：

public int getProfileConnectionState (int profile)

其中个人资料是HEALTH, HEADSET, A2DP

之一

检查回复，如果不是STATE_DISCONNECTED您知道自己有实时连接。

以下是适用于任何API设备的代码示例：

BluetoothAdapter mAdapter;

/**
 * Check if a headset type device is currently connected. 
 * 
 * Always returns false prior to API 14
 * 
 * @return true if connected
 */
public boolean isVoiceConnected() {
    boolean retval = false;
    try {
        Method method = mAdapter.getClass().getMethod("getProfileConnectionState", int.class);
        // retval = mAdapter.getProfileConnectionState(android.bluetooth.BluetoothProfile.HEADSET) != android.bluetooth.BluetoothProfile.STATE_DISCONNECTED;
        retval = (Integer)method.invoke(mAdapter, 1) != 0;
    } catch (Exception exc) {
        // nothing to do
    }
    return retval;
}

Answer 2

public void checkConnected()
{
  // true == headset connected && connected headset is support hands free
  int state = BluetoothAdapter.getDefaultAdapter().getProfileConnectionState(BluetoothProfile.HEADSET);
  if (state != BluetoothProfile.STATE_CONNECTED)
    return;

  try
  {
    BluetoothAdapter.getDefaultAdapter().getProfileProxy(_context, serviceListener, BluetoothProfile.HEADSET);
  }
  catch (Exception e)
  {
    e.printStackTrace();
  }
}

private ServiceListener serviceListener = new ServiceListener()
{
  @Override
  public void onServiceDisconnected(int profile)
  {

  }

  @Override
  public void onServiceConnected(int profile, BluetoothProfile proxy)
  {
    for (BluetoothDevice device : proxy.getConnectedDevices())
    {
      Log.i("onServiceConnected", "|" + device.getName() + " | " + device.getAddress() + " | " + proxy.getConnectionState(device) + "(connected = "
          + BluetoothProfile.STATE_CONNECTED + ")");
    }

    BluetoothAdapter.getDefaultAdapter().closeProfileProxy(profile, proxy);
  }
};

Answer 3

以下是步骤：

首先，您开始尝试发现设备

IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
为其注册广播接收器：

registerReceiver(mReceiver, filter);

关于mReceiver的定义：

private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
    public void onReceive(Context context, Intent intent) {
    String action = intent.getAction();
    // When discovery finds a device
    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
        arrayadapter.add(device.getName())//arrayadapter is of type ArrayAdapter<String>
        lv.setAdapter(arrayadapter); //lv is the list view 
        arrayadapter.notifyDataSetChanged();
    }
}

并在新设备发现时自动填充列表。

Answer 4

Android系统不允许您查询所有“当前”连接的设备。但是，您可以查询配对设备。您需要使用广播接收器来监听ACTION_ACL_ {CONNECTED | DISCONNECTED}事件以及STATE_BONDED事件，以更新您的应用程序状态以跟踪当前连接的内容。

Answer 5

首先，您需要检索BluetoothAdapter：

最终BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter（）;

第二，您需要确保蓝牙可用并打开：

if（btAdapter！= null && btAdapter.isEnabled（））// null表示否蓝牙！

如果未关闭蓝牙，则可以使用文档中不推荐的btAdapter.enable()或要求用户这样做：Programmatically enabling bluetooth on Android

第三，您需要定义一个状态数组（以过滤掉未连接的设备）：

最终的int []状态=新的int [] {BluetoothProfile.STATE_CONNECTED， BluetoothProfile.STATE_CONNECTING};

第四，您创建一个BluetoothProfile.ServiceListener 包含两个在连接服务时触发的回调，以及断开连接：

final BluetoothProfile.ServiceListener listener = new BluetoothProfile.ServiceListener() {
    @Override
    public void onServiceConnected(int profile, BluetoothProfile proxy) {
    }

    @Override
    public void onServiceDisconnected(int profile) {
    }
};

现在，由于您必须对Android SDK（A2Dp, GATT, GATT_SERVER, Handset, Health, SAP）中所有可用的蓝牙配置文件重复查询过程，因此应按以下步骤进行操作：

在onServiceConnected中，放置一个条件来检查当前配置文件是什么，以便将找到的设备添加到正确的集合中，并使用：proxy.getDevicesMatchingConnectionStates(states)来过滤掉未连接的设备：

switch (profile) {
    case BluetoothProfile.A2DP:
        ad2dpDevices.addAll(proxy.getDevicesMatchingConnectionStates(states));
        break;
    case BluetoothProfile.GATT: // NOTE ! Requires SDK 18 !
        gattDevices.addAll(proxy.getDevicesMatchingConnectionStates(states));
        break;
    case BluetoothProfile.GATT_SERVER: // NOTE ! Requires SDK 18 !
        gattServerDevices.addAll(proxy.getDevicesMatchingConnectionStates(states));
        break;
    case BluetoothProfile.HEADSET: 
        headsetDevices.addAll(proxy.getDevicesMatchingConnectionStates(states));
        break;
    case BluetoothProfile.HEALTH: // NOTE ! Requires SDK 14 !
        healthDevices.addAll(proxy.getDevicesMatchingConnectionStates(states));
        break;
    case BluetoothProfile.SAP: // NOTE ! Requires SDK 23 !
        sapDevices.addAll(proxy.getDevicesMatchingConnectionStates(states));
        break;
}

最后，最后要做的就是开始查询过程：

btAdapter.getProfileProxy(yourContext, listener, BluetoothProfile.A2DP);
btAdapter.getProfileProxy(yourContext, listener, BluetoothProfile.GATT); // NOTE ! Requires SDK 18 !
btAdapter.getProfileProxy(yourContext, listener, BluetoothProfile.GATT_SERVER); // NOTE ! Requires SDK 18 !
btAdapter.getProfileProxy(yourContext, listener, BluetoothProfile.HEADSET);
btAdapter.getProfileProxy(yourContext, listener, BluetoothProfile.HEALTH); // NOTE ! Requires SDK 14 !
btAdapter.getProfileProxy(yourContext, listener, BluetoothProfile.SAP); // NOTE ! Requires SDK 23 !

来源：https://stackoverflow.com/a/34790442/2715054

Answer 6

因此您会获得已配对设备的列表。

 BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter();
    Set<BluetoothDevice> pairedDevicesList = btAdapter.getBondedDevices();


    for (BluetoothDevice pairedDevice : pairedDevicesList) {
    Log.d("BT", "pairedDevice.getName(): " + pairedDevice.getName());
    Log.d("BT", "pairedDevice.getAddress(): " + pairedDevice.getAddress());

    saveValuePreference(getApplicationContext(), pairedDevice.getName(), pairedDevice.getAddress());

}

Answer 7

我找到了一个解决方案，它可以在android 10上运行

科特林

Roles

在主线程中调用此方法

private val serviceListener: ServiceListener = object : ServiceListener {
    var name: String? = null
    var address: String? = null
    var threadName: String? = null
    override fun onServiceDisconnected(profile: Int) {}
    override fun onServiceConnected(profile: Int, proxy: BluetoothProfile) {
        for (device in proxy.connectedDevices) {
            name = device.name
            address = device.address
            threadName = Thread.currentThread().name
            Toast.makeText(
                this@MainActivity,
                "$name $address$threadName",
                Toast.LENGTH_SHORT
            ).show()
            Log.i(
                "onServiceConnected",
                "|" + device.name + " | " + device.address + " | " + proxy.getConnectionState(
                    device
                ) + "(connected = "
                        + BluetoothProfile.STATE_CONNECTED + ")"
            )
        }
        BluetoothAdapter.getDefaultAdapter().closeProfileProxy(profile, proxy)
    }
}

Java

original code

Answer 8

请在线分析this class。

在这里，您将了解如何发现所有已连接（配对）的蓝牙设备。

列出连接的蓝牙设备？

8 个答案:

科特林

在主线程中调用此方法

Java