Lollipop及以上版本的AudioManager.requestAudioFocus

Question

Lollipop及以上版本的AudioManager.requestAudioFocus

androidandroid-mediaplayerandroid-audiomanager

4

我正在为一款训练应用程序实现一个AudioHelper，可以在您的训练过程中播放一些励志演讲。因此，如果演讲正在进行，我希望将我的spotify音频暂停，以便清晰地听到演讲。对于Kitkat和Oreo（以及更高版本），我已经实现了这一点（请参见代码）。但是对于Lollipop，我找不到正确的实现方法。在developer.android.com上，他们写道：

针对 Android 5.0（API级别21）及更高版本的应用程序，音频应用程序应使用AudioAttributes来描述应用程序正在播放的音频类型。例如，播放语音的应用程序应该指定CONTENT_TYPE_SPEECH。source

但是我从何处开始？我需要做什么才能实现与Kitkat和Oreo相同的结果？（对于API 21到API 26，AudioFocusRequest.Builder（）尚未可用。）

这是我的代码片段:

/** Apps running Android 8.0 (API level 26) or greater should use the requestAudioFocus() method,
 * which takes an AudioFocusRequest parameter. The AudioFocusRequest contains information about
 * the audio context and capabilities of your app. The system uses this information to manage
 * the gain and loss of audio focus automatically.
 */
@RequiresApi(Build.VERSION_CODES.O)
private fun loadAndPlayAudioForOreoAndHigher() {
    val audioAttributes = AudioAttributes.Builder()
            .setUsage(AudioAttributes.USAGE_NOTIFICATION)
            .setContentType(AudioAttributes.CONTENT_TYPE_SPEECH)
            .build()

    val audioFocusRequest = AudioFocusRequest.Builder(AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK).run {
        setAudioAttributes(audioAttributes)
        setAcceptsDelayedFocusGain(true)
        setOnAudioFocusChangeListener(MediaHelper)
        build()
    }

    val focusRequest = audioManager.requestAudioFocus(audioFocusRequest)
    if(focusRequest == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
        mediaPlayer.setOnCompletionListener { audioManager.abandonAudioFocusRequest(audioFocusRequest) }
        mediaPlayer.start()
    }
}

/**
 * For apps that target Android 5.0 (API level 21) and later, audio apps should use
 * AudioAttributes to describe the type of audio your app is playing. For example,
 * apps that play speech should specify CONTENT_TYPE_SPEECH.
 */
@RequiresApi(Build.VERSION_CODES.LOLLIPOP)
private fun loadAndPlayAudioForLollipopAndHigher() {
    // TODO implement audioFocusRequest() and abandonAudioFocusRequest()
}

/**
 * Beginning with Android 2.2 (API level 8), apps manage audio focus by calling
 * requestAudioFocus() and abandonAudioFocus(). Apps must also register an
 * AudioManager.OnAudioFocusChangeListener with both calls in order to receive callbacks
 * and manage their own audio level.
 */
@Suppress("DEPRECATION")
@RequiresApi(Build.VERSION_CODES.KITKAT)
private fun loadAndPlayAudioForKitkatAndHigher() {
    val focusRequestResult = audioManager.requestAudioFocus(this, AudioManager.STREAM_NOTIFICATION, AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK)
    if(focusRequestResult == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
        mediaPlayer.setOnCompletionListener { audioManager.abandonAudioFocus(this) }
        mediaPlayer.start()
    }
}

- Carlo Matulessy

你可以尝试使用 MediaPlayer 的 setAudioAttributes 方法。https://developer.android.com/reference/android/media/MediaPlayer#setAudioAttributes(android.media.AudioAttributes) - Kamal

1个回答

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可以查看英文原文，
原文链接

- lollipop k · Accepted Answer

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        videoView.setAudioFocusRequest(AudioManager.AUDIOFOCUS_NONE);
    } else {
        AudioManager audioManager = (AudioManager) getApplicationContext().getSystemService(Context.AUDIO_SERVICE);
        audioManager.requestAudioFocus(null, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK);
    }