检测蓝牙耳机是否连接

Question

在使用 VOIP 应用程序时，在静音模式下，提示音或铃声只能在蓝牙耳机上播放。如果已连接，则可以在耳机上播放，但如果未连接耳机，则虽然手机处于静音模式，但扬声器上会播放提示音。

请解释一下是否有办法检测蓝牙耳机已连接。

Answer 1

这是我的代码：

/** */
class BluetoothStateMonitor(private val appContext: Context): BroadcastReceiver(), MonitorInterface {
    var isHeadsetConnected = false
    @Synchronized
    get
    @Synchronized
    private set

    /** Start monitoring */
    override fun start() {
        val bluetoothManager = appContext.getSystemService(Context.BLUETOOTH_SERVICE) as BluetoothManager
        bluetoothManager.adapter.getProfileProxy(appContext, object:BluetoothProfile.ServiceListener {
            /** */
            override fun onServiceDisconnected(profile: Int) {
                isHeadsetConnected = false
            }

            /** */
            override fun onServiceConnected(profile: Int, proxy: BluetoothProfile?) {
                isHeadsetConnected = proxy!!.connectedDevices.size > 0
            }

        }, BluetoothProfile.HEADSET)

        appContext.registerReceiver(this, IntentFilter(BluetoothAdapter.ACTION_CONNECTION_STATE_CHANGED))
    }

    /** Stop monitoring */
    override fun stop() {
        appContext.unregisterReceiver(this)
    }

    /** For broadcast receiver */
    override fun onReceive(context: Context?, intent: Intent?) {
        val connectionState = intent!!.extras!!.getInt(BluetoothAdapter.EXTRA_CONNECTION_STATE)
        when(connectionState) {
            BluetoothAdapter.STATE_CONNECTED -> isHeadsetConnected = true
            BluetoothAdapter.STATE_DISCONNECTED -> isHeadsetConnected = false
            else -> {}
        }
    }
}

让我解释一下。您应该同时使用 ProfileProxy 和 BroadcastReceiver。 ProfileProxy 可让您检测在应用程序运行之前连接耳机的情况。反过来，BroadcastReceiver 可让您在执行应用时检测耳机何时连接/断开。

Answer 2

对于简单的检查，请使用以下内容。记得在清单中添加 BLUETOOTH 权限（非危险权限）

val bluetoothAdapter = BluetoothAdapter.getDefaultAdapter()
return (bluetoothAdapter != null && BluetoothProfile.STATE_CONNECTED == bluetoothAdapter.getProfileConnectionState(BluetoothProfile.HEADSET))

Answer 3

感谢@cristallo 的回答

我就是这样处理的。

连接到代理

bluetoothAdapter.getProfileProxy(mContext, mProfileListener, BluetoothProfile.HEADSET);

创建了一个监听器

private BluetoothProfile.ServiceListener mProfileListener = new BluetoothProfile.ServiceListener()
{

    @Override
    public void onServiceConnected(int profile, BluetoothProfile proxy)
    {
        if (profile == BluetoothProfile.HEADSET)
        {
            mBluetoothHeadset = (BluetoothHeadset) proxy;
            if(mBluetoothHeadset.getConnectedDevices().size()>0) {
                IS_BLUETOOTH_CONNECTED = true;
                Logs.d(TAG,"Bluetooth device is connected");
            }
            
        }
    }

    @Override
    public void onServiceDisconnected(int profile)
    {
         if (profile == BluetoothProfile.HEADSET)
         {
             mBluetoothHeadset = null;
             IS_BLUETOOTH_CONNECTED = false;
             Logs.d(TAG,"Bluetooth device is disconnected");
         }
    }
};

转自Detect programatically if headphone or bluetooth headset attached with android phone

博主 Vipul 创建了一个 BluetoothHeadsetManager 类，它处理获取耳机配置文件、处理监听器、检查蓝牙是否启用。我没有使用广播接收器。

switch (audioMgr.getRingerMode()) {
        case AudioManager.RINGER_MODE_SILENT:
            if(BluetoothHeadsetManager.IS_BLUETOOTH_CONNECTED) {
                //play notification
            }
            break;
        case AudioManager.RINGER_MODE_VIBRATE:
            if(BluetoothHeadsetManager.IS_BLUETOOTH_CONNECTED) {
                //play notification
            }
            break;
        case AudioManager.RINGER_MODE_NORMAL:
            //play ringtone
            break;
        default:
            break;
        }}