Android：如何检测当前正在获取音频流的蓝牙设备？答案

【问题标题】：Android: How to detect which Bluetooth device is currently getting audio stream?Android：如何检测当前正在获取音频流的蓝牙设备？
【发布时间】：2020-11-13 18:33:27
【问题描述】：

我得到一个 A2DP 设备列表，如下所示：

bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
bluetoothAdapter.getProfileProxy(context, new BluetoothProfile.ServiceListener() {

    @Override
    public void onServiceConnected(int profile, BluetoothProfile proxy) {
        List<BluetoothDevice> devices = proxy.getConnectedDevices();
    }

    @Override
    public void onServiceDisconnected(int profile) {

    }
}, BluetoothProfile.A2DP);

问题在于，有时，当我连接了多个设备时，只有其中一个设备从我的应用程序获取音频流。我怎么知道哪个设备是获取流的设备？另外我听说在较新的 Android 版本中，您可以连接到蓝牙设备，但仍然在手机本身播放音频，有没有办法知道什么时候会发生这种情况？

【问题讨论】：

标签： android android-bluetooth a2dp

【解决方案1】：

我终于找到了解决办法。

    bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
    bluetoothAdapter.getProfileProxy(context, new BluetoothProfile.ServiceListener() {

    @Override
    public void onServiceConnected(int profile, BluetoothProfile proxy) {
        List<BluetoothDevice> devices = proxy.getConnectedDevices();
        BluetoothA2dp bA2dp = (BluetoothA2dp) proxy;
        for (BluetoothDevice device: devices) { 
            boolean isPlaying = bA2dp.isA2dpPlaying(device);
        }
    }

    @Override
    public void onServiceDisconnected(int profile) {

    }
}, BluetoothProfile.A2DP);

【讨论】：

【解决方案2】：

请尝试在此处查看详细信息 https://developer.android.com/reference/android/bluetooth/BluetoothClass.Device.Major``https://developer.android.com/reference/android/bluetooth/BluetoothClass.Device.Major

for (BluetoothDevice device : pairedDevices) { String deviceBTMajorClass = getBTMajorDeviceClass(device.getBluetoothClass().getMajorDeviceClass()); if (D) Log.d(TAG, "deviceBTMajorClass"+deviceBTMajorClass); //btArrayAdapter.add(deviceBTName + "\n"+ deviceBTMajorClass); data.add(device.getName() + "\n" + device.getAddress()); } private String getBTMajorDeviceClass(int major) { switch (major) { case BluetoothClass.Device.Major.AUDIO_VIDEO: return "AUDIO_VIDEO"; case BluetoothClass.Device.Major.COMPUTER: return "COMPUTER"; case BluetoothClass.Device.Major.HEALTH: return "HEALTH"; case BluetoothClass.Device.Major.IMAGING: return "IMAGING"; case BluetoothClass.Device.Major.MISC: return "MISC"; case BluetoothClass.Device.Major.NETWORKING: return "NETWORKING"; case BluetoothClass.Device.Major.PERIPHERAL: return "PERIPHERAL"; case BluetoothClass.Device.Major.PHONE: return "PHONE"; case BluetoothClass.Device.Major.TOY: return "TOY"; case BluetoothClass.Device.Major.UNCATEGORIZED: return "UNCATEGORIZED"; case BluetoothClass.Device.Major.WEARABLE: return "AUDIO_VIDEO";`enter code here` default: return "unknown!"; } }

【讨论】：