MODE_IN_CALL，MODE_IN_COMMUNICATION，MODE_CALL_SCREENING有什么区别？

Question

这是文件上说的，但我不能完全理解。

/* modes for setMode/getMode/setRoute/getRoute */
    /**
     * Audio harware modes.
     */
    /**
     * Invalid audio mode.
     */
    public static final int MODE_INVALID            = AudioSystem.MODE_INVALID;
    /**
     * Current audio mode. Used to apply audio routing to current mode.
     */
    public static final int MODE_CURRENT            = AudioSystem.MODE_CURRENT;
    /**
     * Normal audio mode: not ringing and no call established.
     */
    public static final int MODE_NORMAL             = AudioSystem.MODE_NORMAL;
    /**
     * Ringing audio mode. An incoming is being signaled.
     */
    public static final int MODE_RINGTONE           = AudioSystem.MODE_RINGTONE;
    /**
     * In call audio mode. A telephony call is established.
     */
    public static final int MODE_IN_CALL            = AudioSystem.MODE_IN_CALL;
    /**
     * In communication audio mode. An audio/video chat or VoIP call is established.
     */
    public static final int MODE_IN_COMMUNICATION   = AudioSystem.MODE_IN_COMMUNICATION;
    /**
     * Call screening in progress. Call is connected and audio is accessible to call
     * screening applications but other audio use cases are still possible.
     */
    public static final int MODE_CALL_SCREENING     = AudioSystem.MODE_CALL_SCREENING;

你能用例子解释一下吗？

目前，我在WebView上使用视频聊天服务，我得到了MODE_CALL_SCREENING，它使用媒体音量，它应该使用“呼叫”音量。我怎么能强迫它？

Answer 1

MODE_IN_CALL

你是通过只打音频电话(普通电话)与某人交谈的。

MODE_IN_COMMUNICATION

你是视频和音频，和你的朋友聊天，或者在VoIP上给他们打电话

MODE_CALL_SCREENING

你的电话响了，你在接电话之前先检查一下号码。

Answer 2

模式参数在AudioSystem类中定义，以设置电话的状态。

MODE_IN_CALL：来电模式。一个电话已经确定了。

Constant Value: 2 (0x00000002)

public static final int MODE_IN_CALL 





private void setAudioNormal() {
    AudioManager audioManager = (AudioManager)mContext.getSystemService(Context.AUDIO_SERVICE);
    audioManager.setMode(AudioManager.MODE_NORMAL);
    audioManager.setSpeakerphoneOn(false);
  }
}

另一个例子

import android.media.AudioManager; 
public void startOutgoingRinger(OutgoingRinger.Type type) {
    AudioManager audioManager = ServiceUtil.getAudioManager(context);
    audioManager.setMicrophoneMute(false);

    if (type == OutgoingRinger.Type.SONAR) {
        audioManager.setSpeakerphoneOn(false);
    }

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
        audioManager.setMode(AudioManager.MODE_IN_COMMUNICATION);
    } else {
        audioManager.setMode(AudioManager.MODE_IN_CALL);
    }

    outgoingRinger.start(type);
}

通信音频模式下的MODE_IN_COMMUNICATION：。建立音频/视频聊天或VoIP通信。

Constant Value: 3 (0x00000003)

public static final int MODE_IN_COMMUNICATION



  private void chooseVoiceMode() {
      AudioManager audioManager = (AudioManager)mContext.getSystemService(Context.AUDIO_SERVICE);
      if(mAudioConfiguration.aec) {
        audioManager.setMode(AudioManager.MODE_IN_COMMUNICATION);
        audioManager.setSpeakerphoneOn(true);
      } else {
        audioManager.setMode(AudioManager.MODE_NORMAL);
        audioManager.setSpeakerphoneOn(false);
      }
    }

MODE_CALL_SCREENING：呼叫筛选正在进行中。有一个呼叫连接，但音频没有使用。呼叫筛选:这是识别来电者的过程，提供有关来电者的信息，并确定如何最好地响应该呼叫。

Constant Value: 4 (0x00000004)

public static final int MODE_CALL_SCREENING





public int getMode() {
    final IAudioService service = getService();
    try {
        int mode = service.getMode();
        int sdk;
        try {
            sdk = getContext().getApplicationInfo().targetSdkVersion;
        } catch (NullPointerException e) {
            // some tests don't have a Context
            sdk = Build.VERSION.SDK_INT;
        }
        if (mode == MODE_CALL_SCREENING && sdk <= Build.VERSION_CODES.Q) {
            mode = MODE_IN_CALL;
        }
        return mode;
    } catch (RemoteException e) {
        throw e.rethrowFromSystemServer();
    }
}

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