如何从特定的蓝牙配置文件中获取连接的设备列表

Question

Is there anyway to get the connected devices list from support profiles (HDD,Spp and audio). The requirement is like my device will support HDD,SPP and Audio, so i have to filter the devices which supports all these profiles. Is there anyway to filter the devices?

Answer 1

Yes that is possible but your Android application must target SDK 11 or later ( Android 3.0.X ).

The solution to your question is that you have to query all BluetoothDevices known by your Android device. By known I mean all paired connected or unconnected devices and unpaired connected devices.

We will filter out unconnected devices later since you only want currently connected devices.

---

• First you need to retrieve the BluetoothAdapter :

final BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter();

• Second you need to make sure Bluetooth is available and turned on :

if (btAdapter != null && btAdapter.isEnabled()) // null means no Bluetooth!

If the Bluetooth is not turned out you can either use btAdapter.enable() which is not recommended in the documentation or ask the user to do it : Programmatically enabling bluetooth on Android

• Third you need to define an array of states (to filter out unconnected devices):

final int[] states = new int[] {BluetoothProfile.STATE_CONNECTED, BluetoothProfile.STATE_CONNECTING};

• Fourth, you create a BluetoothProfile.ServiceListener which contains two callbacks triggered when a service is connected and disconnected :

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

---

Now since you have to repeat the querying process for all available Bluetooth Profiles in the Android SDK ( A2Dp, GATT, GATT_SERVER, Handset, Health, SAP ) you should proceed as follow :

In onServiceConnected , place a condition that check what is the current profile so that we add the found devices into the correct collection and we use : proxy.getDevicesMatchingConnectionStates(states) to filter out unconnected devices:

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;
}

And finally, the last thing to do is start the querying process :

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 !