我正在尝试仅使用耳机在Android中产生声音

问题描述

我正在使用Flutter开发一个应用程序，我只想通过耳机或顶部扬声器（用于通话的声音）发出声音。目前它同时使用大扬声器和耳机，但我想更改它，以便仅在连接耳机时才能收听。我当前用于流式传输和播放音频的程序包是https://pub.dev/packages/sound_stream。

这是初始化播放器的代码：

private fun initializePlayer(@NonNull call: MethodCall,@NonNull result: Result) {
    mPlayerSampleRate = call.argument<Int>("sampleRate") ?: mPlayerSampleRate
    debugLogging = call.argument<Boolean>("showLogs") ?: false
    mPlayerFormat = AudioFormat.Builder()
            .setEncoding(AudioFormat.ENCODING_PCM_16BIT)
            .setChannelMask(AudioFormat.CHANNEL_OUT_MONO)
            .setSampleRate(mPlayerSampleRate)
            .build()

    mPlayerBufferSize = AudioTrack.getMinBufferSize(mPlayerSampleRate,AudioFormat.CHANNEL_OUT_MONO,AudioFormat.ENCODING_PCM_16BIT)

    if (mAudioTrack?.state == AudioTrack.STATE_INITIALIZED) {
        mAudioTrack?.release()
    }

    /*
    // I have tried with different examples but they don't work

    var value = this.pluginContext?.getSystemService(Context.AUdio_SERVICE) as AudioManager

    //For phone ear piece
    value.mode = AudioManager.MODE_IN_COMMUNICATION;
    value.stopBluetoothSco();
    value.isBluetoothScoOn = false;
    value.isspeakerphoneOn = false;

    //For BT
    value.setMode(AudioManager.MODE_IN_COMMUNICATION);
    value.startBluetoothSco();
    value.setBluetoothScoOn(true);

    //For phone speaker(loadspeaker)
    value.setMode(AudioManager.MODE_norMAL);
    value.stopBluetoothSco();
    value.setBluetoothScoOn(false);
    value.setSpeakerphoneOn(true);

     */

    val audioAttributes = AudioAttributes.Builder()
            .setContentType(AudioAttributes.CONTENT_TYPE_MUSIC)
            .setUsage(AudioAttributes.USAGE_MEDIA)
            .setFlags(AudioAttributes.FLAG_AUDIBILITY_ENFORCED)
            .build()
    mAudioTrack = AudioTrack(audioAttributes,mPlayerFormat,mPlayerBufferSize,AudioTrack.MODE_STREAM,AudioManager.AUdio_SESSION_ID_GENERATE)

    result.success(true)
    sendplayerStatus(SoundStreamStatus.Initialized)
}

这是播放音频的代码：

private fun startPlayer(result: Result) {
    try {
        if (mAudioTrack?.state == AudioTrack.PLAYSTATE_PLAYING) {
            result.success(true)
            return
        }
        var value = this.pluginContext!!.getSystemService(Context.AUdio_SERVICE) as AudioManager

        if(value.isWiredHeadseton()){
            mAudioTrack!!.play()
        }

        sendplayerStatus(SoundStreamStatus.Playing)
        result.success(true)
    } catch (e: Exception) {
        result.error(SoundStreamErrors.FailedToPlay.name,"Failed to start Player",e.localizedMessage)
    }
}

该代码在kotlin的Android部分中使用。

谢谢。

解决方法

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