音频管理器自行管理的通话指南

本指南将介绍希望自行管理音频和可听设备状态的通信应用,例如互联网语音协议 (VoIP)。

注册音频回调

首先,创建一个 AudioDeviceCallback,用于在音频设备与设备连接或断开连接时通知您的应用。

Kotlin

val audioDeviceCallback: AudioDeviceCallback = object : AudioDeviceCallback() {
  override fun onAudioDevicesAdded(addedDevices: Array) {}
  override fun onAudioDevicesRemoved(removedDevices: Array) {}
}

audioManager.registerAudioDeviceCallback(audioDeviceCallback)

Java

final AudioDeviceCallback audioDeviceCallback = new AudioDeviceCallback() {
  @Override
  public void onAudioDevicesAdded(AudioDeviceInfo[] addedDevices) {
  }

  @Override
  public void onAudioDevicesRemoved(AudioDeviceInfo[] removedDevices) {
    // Handle device removal
  }
};

audioManager.registerAudioDeviceCallback(audioDeviceCallback);

检查当前使用的通信设备

通过音频管理器,您可以了解当前处于活动状态的通信设备。

Kotlin

val currentCommunicationDevice: AudioDeviceInfo? = audioManager.communicationDevice

Java

AudioDeviceInfo currentCommunicationDevice = audioManager.getCommunicationDevice();

监听通信设备何时发生变化,可让您的应用知道何时应用了路由以及您选择的设备是否处于活动状态。

Kotlin

val listener =
  OnCommunicationDeviceChangedListener { device -> // Handle changes
    currentCommunicationDevice = device
  }
audioManager.addOnCommunicationDeviceChangedListener(executor, listener)

Java

AudioManager.OnCommunicationDeviceChangedListener listener = 
      new AudioManager.OnCommunicationDeviceChangedListener() {
  @Override
  void onCommunicationDeviceChanged(AudioDeviceInfo device) {
      // Handle changes
      currentCommunicationDevice = device;
  }
};
AudioManager.addOnCommunicationDeviceChangedListener(executor, listener);

查找 BLE 音频设备

使用 getAvailableCommuncationDevices() 查看哪些设备可用于 VoIP 通话。使用 AudioDeviceInfo 检查设备是否为 BLE 耳机。本示例将查找第一台支持 BLE 音频的设备,不过您也可以考虑查找所有受支持的设备,并允许用户自行选择。

Kotlin


// Get list of currently available devices
val devices = audioManager.availableCommunicationDevices

// User choose one of the devices, let's say, TYPE_BLE_HEADSET
val userSelectedDeviceType = AudioDeviceInfo.TYPE_BLE_HEADSET

//for the device from the list
var selectedDevice: AudioDeviceInfo? = null
for (device in devices) {
  if (device.type == userSelectedDeviceType) {
    selectedDevice = device
    break
  }
}

Java


// Get list of currently available devices
List devices = audioManager.getAvailableCommunicationDevices();

// User choose one of the devices, for example, TYPE_BLE_HEADSET
int userSelectedDeviceType = AudioDeviceInfo.TYPE_BLE_HEADSET;

// Filter for the device from the list
AudioDeviceInfo selectedDevice = null;
for (AudioDeviceInfo device : devices) {
    if (device.getType() == userSelectedDeviceType) {
        selectedDevice = device;
        break;
    }
}

设置通信设备

找到兼容的设备后,使用 setCommunicationDevice 设置要接收路线的设备。检查结果会通知您的应用,音频管理器是否正在尝试设置设备或遇到错误。

Kotlin


val result = audioManager.setCommunicationDevice(selectedDevice)
if (!result) {
  // Handle error.
}
// Wait for currentCommunicationDevice to become selectedDevice with a timeout (e.g. 30s)

Java


boolean result = audioManager.setCommunicationDevice(selectedDevice);
if (!result) {
  // Handle error.
}
// Wait for currentCommunicationDevice to become selectedDevice with a timeout (e.g. 30s)

设置好 BLE 音频设备后,拨打电话时,音频流就会有正确的音频路由。

结束会话

应用完成通话或会话后,清除处于活动状态的通信设备。这有助于确保用户在不同应用之间切换时获得良好的体验。

Kotlin


// Clear the selection, ready for next call
audioManager.clearCommunicationDevice()

Java


// Clear the selection, ready for next call
audioManager.clearCommunicationDevice();