如何在android 10中以编程方式切换音频输出？

Question

我的使用案例是，我有一个应用程序，用户可以在其中按下按钮，然后在外部扬声器和有线耳机/蓝牙设备之间切换。如果用户连接到有线耳机或蓝牙耳机设备，我想将该有线耳机或蓝牙的音频输出切换到外部扬声器，然后当他们再次单击时，重新启动有线耳机/蓝牙音频输出。

有人知道Android 10可以做到这一点吗？我在这篇文章中尝试了以下示例，但它并不总是适用于蓝牙情况。我的代码如下：

if (shouldEnableExternalSpeaker) {
     audioManager.mode = AudioManager.MODE_IN_COMMUNICATION
     audioManager.isSpeakerphoneOn = true
     if (isBlueToothConnected) {
         audioManager.stopBluetoothScoOn()
     }
} else {
     if (isBlueToothConnected) {
         audioManager.startBluetoothSco()
     }

     audioManager.mode = AudioManager.NORMAL
     audioManager.isSpeakerphoneOn = false
}

我还拥有用户音频的必要权限：

<代码>

Answer 1

线：

audioManager.isSpeakerphoneOn = true
audioManager.isSpeakerphoneOn = false

将不起作用。您必须使用set方法：

案例1-蓝牙

mAudioManager.startBluetoothSco(); // This method can be used by applications wanting to send and received audio to/from a bluetooth SCO headset while the phone is not in call. 
mAudioManager.setBluetoothScoOn(true); // set true to use bluetooth SCO for communications; false to not use bluetooth SCO for communications

案例2-有线

mAudioManager.stopBluetoothSco(); // stop wanting to send and receive
mAudioManager.setBluetoothScoOn(false); // turn off bluetooth
mAudioManager.setSpeakerphoneOn(false); //set true to turn on speakerphone; false to turn it off

案例3-内部扬声器

mAudioManager.stopBluetoothSco();
mAudioManager.setBluetoothScoOn(false);
mAudioManager.setSpeakerphoneOn(true); // turn on speaker phone

您可以按如下方式保持事情自动发生：

public class BluetoothReceiver extends BroadcastReceiver {
    private AudioManager localAudioManager;
    private static final int STATE_DISCONNECTED  = 0x00000000;
    private static final String EXTRA_STATE = "android.bluetooth.headset.extra.STATE";
    private static final String TAG = "BluetoothReceiver";
    private static final String ACTION_BT_HEADSET_STATE_CHANGED  = "android.bluetooth.headset.action.STATE_CHANGED";
    private static final String ACTION_BT_HEADSET_FORCE_ON = "android.bluetooth.headset.action.FORCE_ON";
    private static final String ACTION_BT_HEADSET_FORCE_OFF = "android.bluetooth.headset.action.FORCE_OFF";

    @Override
    public void onReceive(final Context context, final Intent intent) {
        Log.i(TAG,"onReceive - BluetoothBroadcast");
        localAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
        final String action = intent.getAction();
        if (action.equals(ACTION_BT_HEADSET_STATE_CHANGED)) {
            final int extraData = intent.getIntExtra(EXTRA_STATE, STATE_DISCONNECTED);
            if (extraData == STATE_DISCONNECTED) {
                //no headset -> going other modes
                localAudioManager.setBluetoothScoOn(false);
                localAudioManager.stopBluetoothSco();
                localAudioManager.setMode(AudioManager.MODE_NORMAL);
                Log.i(TAG, "Bluetooth Headset Off " + localAudioManager.getMode());
                Log.i(TAG, "A2DP: " + localAudioManager.isBluetoothA2dpOn() + ". SCO: " + localAudioManager.isBluetoothScoAvailableOffCall());
            } else {            
                localAudioManager.setMode(0);
                localAudioManager.setBluetoothScoOn(true);
                localAudioManager.startBluetoothSco();
                localAudioManager.setMode(AudioManager.MODE_IN_CALL);
                Log.i(TAG, "Bluetooth Headset On " + localAudioManager.getMode());
                Log.i(TAG, "A2DP: " + localAudioManager.isBluetoothA2dpOn() + ". SCO: " + localAudioManager.isBluetoothScoAvailableOffCall());
            }
        }   

        if (action.equals(ACTION_BT_HEADSET_FORCE_ON)) {
            localAudioManager.setMode(0);
            localAudioManager.setBluetoothScoOn(true);
            localAudioManager.startBluetoothSco();
            localAudioManager.setMode(AudioManager.MODE_IN_CALL);
            Log.i(TAG, "Bluetooth Headset On " + localAudioManager.getMode());
            Log.i(TAG, "A2DP: " + localAudioManager.isBluetoothA2dpOn() + ". SCO: " + localAudioManager.isBluetoothScoAvailableOffCall());
        }

        if (action.equals(ACTION_BT_HEADSET_FORCE_OFF)) {
            localAudioManager.setBluetoothScoOn(false);
            localAudioManager.stopBluetoothSco();
            localAudioManager.setMode(AudioManager.MODE_NORMAL);
            Log.i(TAG, "Bluetooth Headset Off " + localAudioManager.getMode());
            Log.i(TAG, "A2DP: " + localAudioManager.isBluetoothA2dpOn() + ". SCO: " + localAudioManager.isBluetoothScoAvailableOffCall());
        }
    }
}

Answer 2

我认为您应该将操控分为3种情况，通过以下方式播放声音：

1. 通过蓝牙连接的外部设备
2. 有线耳机/设备
3. 电话扬声器

然后生成的代码可以像这样loke。

if(shouldEnableExternalSpeaker) {
    if(isBlueToothConnected) {
        // 1. case - bluetooth device
        mAudioManager.setMode(AudioManager.MODE_IN_COMMUNICATION);
        mAudioManager.startBluetoothSco();
        mAudioManager.setBluetoothScoOn(true);
    } else {
        // 2. case - wired device
        mAudioManager.setMode(AudioManager.MODE_IN_COMMUNICATION);
        mAudioManager.stopBluetoothSco();
        mAudioManager.setBluetoothScoOn(false);
        mAudioManager.setSpeakerphoneOn(false);
    }
} else {
   // 3. case - phone speaker
   mAudioManager.setMode(AudioManager.MODE_NORMAL);
   mAudioManager.stopBluetoothSco();
   mAudioManager.setBluetoothScoOn(false);
   mAudioManager.setSpeakerphoneOn(true);
}

尽管我最近没有使用AudioManager，但这在过去对我有用。