最近接收公司的IM項目，遇到一個歷史遺留下來的問題（三星手機(jī)在語音消息播放時手機(jī)音量鍵無法控制聲音的大?。?。由于第一次接觸音頻類的東西。在這方面經(jīng)驗還是有些不足。在尋找這個問題的解決方案時，也是浪費了不少時間。在此記錄一下。希望可以幫助到有相同問題的小伙伴。
1、經(jīng)測試對比同行軟件：三星手機(jī)的音頻播放音量是由媒體音量控制，不管是外放還是聽筒模式。（這里項目是由MediaPlayer進(jìn)行播放的）

2、解決思路：1.通過監(jiān)聽手機(jī)側(cè)鍵，手動更改媒體音量。2.通過注冊廣播監(jiān)聽手機(jī)音量的改變，更改媒體音量。

具體代碼如下：（伸手黨福利）

第一種方案：

    private lateinit var audioManager: AudioManager
    private var mMusicMaxVolume = 0 //手機(jī)設(shè)置的最大媒體音量
    private var mVoiceCallMaxVolume = 0//手機(jī)設(shè)置的最大通話音量
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)  
        setContentView(R.layout.activity_main)
        audioManager = getSystemService(Context.AUDIO_SERVICE) as AudioManager
        mVoiceCallMaxVolume = audioManager.getStreamMaxVolume(AudioManager.STREAM_VOICE_CALL)
        mMusicMaxVolume = audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC)
    }

   override fun onKeyDown(keyCode: Int, event: KeyEvent?): Boolean {
        //如果是三星手機(jī)，則聽筒模式音量設(shè)置要設(shè)置媒體音量（加上判斷三星手機(jī)代碼邏輯較嚴(yán)謹(jǐn)）
        if (audioManager.mode == AudioManager.MODE_IN_COMMUNICATION && !audioManager.isSpeakerphoneOn && (keyCode == KeyEvent.KEYCODE_VOLUME_UP || keyCode == KeyEvent.KEYCODE_VOLUME_DOWN)) {
            //當(dāng)前通話音量
            val mCurrentVoiceCallVolume =
                audioManager.getStreamVolume(AudioManager.STREAM_VOICE_CALL)
            //計算出當(dāng)前媒體音量
            val mCurrentMusicVolume =
                mCurrentVoiceCallVolume * mMusicMaxVolume / mVoiceCallMaxVolume
            Log.e(
                "TAG",
                "currentVolume=" + mCurrentMusicVolume + "mMusicMaxVolume=" + mMusicMaxVolume
            )
            audioManager.setStreamVolume(
                AudioManager.STREAM_MUSIC,
                mCurrentMusicVolume,
                AudioManager.USE_DEFAULT_STREAM_TYPE
            )
        }
        return super.onKeyDown(keyCode, event)
    }

第二種方案：

private lateinit var volumeBroadCastReceiver: SamsungVolumeBroadCastReceiver
override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
         volumeBroadCastReceiver = SamsungVolumeBroadCastReceiver()
         registerReceiver(
            volumeBroadCastReceiver ,
            IntentFilter(SamsungVolumeBroadCastReceiver.Action)
        )
}

    override fun onDestroy() {
        super.onDestroy()
        unregisterReceiver(volumeBroadCastReceiver)
    }

class SamsungVolumeBroadCastReceiver : BroadcastReceiver() {
    companion object {
        const val Action = "android.media.VOLUME_CHANGED_ACTION"
    }

    private var audioManager: AudioManager =
        App.instance.getSystemService(Context.AUDIO_SERVICE) as AudioManager
    private var mVoiceCallMaxVolume = 0
    private var mMusicMaxVolume = 0

    init {
        mVoiceCallMaxVolume =
            audioManager.getStreamMaxVolume(AudioManager.STREAM_VOICE_CALL)
        mMusicMaxVolume = audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC)
    }

    override fun onReceive(content: Context?, intent: Intent?) {
        //改變的類型
        val mVolumeType = intent?.getIntExtra(
            "android.media.EXTRA_VOLUME_STREAM_TYPE",
            -1
        )
        //當(dāng)前改變的值
        val mNewVolume = intent?.getIntExtra(
            "android.media.EXTRA_VOLUME_STREAM_VALUE",
            -1
        ) ?: -1
        //改變前的值
        val mOldVolume = intent?.getIntExtra(
            "android.media.EXTRA_PREV_VOLUME_STREAM_VALUE",
            -1
        )
       //一次音量改變會接收到兩次action,這里判斷一下mNewVolume和mOldVolume
        if (intent?.action == Action && mVolumeType == AudioManager.STREAM_VOICE_CALL && !audioManager.isSpeakerphoneOn && (mNewVolume != mOldVolume)
        ) {
            val mCurrentMusicVolume =
                mNewVolume * mMusicMaxVolume / mVoiceCallMaxVolume
            //記錄一下 怕有計算出來的mCurrentMusicVolume大于最大值導(dǎo)致的異常奔潰情況
            mLog.e(
                "SamsungVolumeBroadCast",
                "currentVolume=${mCurrentMusicVolume},mMusicMaxVolume=${mMusicMaxVolume}"
            )
            audioManager.setStreamVolume(
                AudioManager.STREAM_MUSIC,
                mCurrentMusicVolume,
                AudioManager.USE_DEFAULT_STREAM_TYPE
            )
        }
    }
}

還有注意的是切換聽筒模式的時候記得設(shè)置下媒體音量，以免一開始無聲

            audioManager.isSpeakerphoneOn = false //關(guān)閉揚聲器
            audioManager.mode = AudioManager.MODE_IN_COMMUNICATION
            //三星手機(jī)聽筒模式要設(shè)置媒體音量
            if (SystemUtil.isSamsung()) {
                audioManager.setStreamVolume(
                    AudioManager.STREAM_MUSIC,
                    audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC),
                    AudioManager.USE_DEFAULT_STREAM_TYPE
                )
            }
            audioManager.setStreamVolume(
                AudioManager.STREAM_VOICE_CALL,
                audioManager.getStreamMaxVolume(AudioManager.STREAM_VOICE_CALL),
                AudioManager.USE_DEFAULT_STREAM_TYPE
            )