獲取和設定安卓音量資訊主要使用了到AudioManager，通過getSystemService拿到AudioManager，然後就可以使用其提供的API輕鬆完成音量值的獲取和設定了。

獲取各類別音量最大值與當前值

    fun getVoiceInfo(view: View) {
        val audioManager = getSystemService(Context.AUDIO_SERVICE) as AudioManager
        // 通話音量
        val callVoiceMax = audioManager.getStreamMaxVolume
 
(AudioManager.STREAM_VOICE_CALL)
        val callVoiceCurrent = audioManager.getStreamVolume(AudioManager.STREAM_VOICE_CALL)
        println("callVoiceMax:$callVoiceMax ,callVoiceCurrent:$callVoiceCurrent")
        // 系統音量
        val systemVoiceMax = audioManager.getStreamMaxVolume(AudioManager.STREAM_SYSTEM)
 

        val systemVoiceCurrent = audioManager.getStreamVolume(AudioManager.STREAM_SYSTEM)
        println("systemVoiceMax:$systemVoiceMax ,systemVoiceCurrent:$systemVoiceCurrent")
        // 鈴聲音量
        val ringVoiceMax = audioManager.getStreamMaxVolume(AudioManager.STREAM_RING)
        val ringVoiceCurrent =
 
 audioManager.getStreamVolume(AudioManager.STREAM_RING)
        println("ringVoiceMax:$ringVoiceMax ,ringVoiceCurrent:$ringVoiceCurrent")
        // 音樂音量
        val musicVoiceMax = audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC)
        val musicVoiceCurrent = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC)
        println("musicVoiceMax:$musicVoiceMax ,musicVoiceCurrent:$musicVoiceCurrent")
        // 提示音音量
        val alarmVoiceMax = audioManager.getStreamMaxVolume(AudioManager.STREAM_ALARM)
        val alarmVoiceCurrent = audioManager.getStreamVolume(AudioManager.STREAM_ALARM)
        println("alarmVoiceMax:$alarmVoiceMax ,alarmVoiceCurrent:$alarmVoiceCurrent")
    }

輸出為：

10-22 14:18:48.810 24532-24532/com.happy.deviceinfo.demo I/System.out: callVoiceMax:11 ,callVoiceCurrent:5

10-22 14:18:48.812 24532-24532/com.happy.deviceinfo.demo I/System.out: systemVoiceMax:15 ,systemVoiceCurrent:6

10-22 14:18:48.813 24532-24532/com.happy.deviceinfo.demo I/System.out: ringVoiceMax:15 ,ringVoiceCurrent:6

10-22 14:18:48.819 24532-24532/com.happy.deviceinfo.demo I/System.out: musicVoiceMax:15 ,musicVoiceCurrent:2

10-22 14:18:48.821 24532-24532/com.happy.deviceinfo.demo I/System.out: alarmVoiceMax:15 ,alarmVoiceCurrent:10

設定音量值

同理，通過AudioManager提供的setStreamVolume可輕鬆完成設定，以音樂音量為例：

fun setMusicVoice(view: View) {
        val audioManager = getSystemService(Context.AUDIO_SERVICE) as AudioManager
        // 設定前音量
        val musicVoiceCurrentBeforeSet = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC)
        println("設定前：musicVoiceCurrentBeforeSet:$musicVoiceCurrentBeforeSet")
        // 設定音量
        audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 0, AudioManager.FLAG_PLAY_SOUND)
        // 設定好音量
        val musicVoiceCurrentAfterSet = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC)
        println("設定前：musicVoiceCurrentAfterSet:$musicVoiceCurrentAfterSet")
    }

輸出為：

10-22 14:37:30.816 25012-25012/com.happy.deviceinfo.demo I/System.out: 設定前：musicVoiceCurrentBeforeSet:2

10-22 14:37:30.827 25012-25012/com.happy.deviceinfo.demo I/System.out: 設定前：musicVoiceCurrentAfterSet:0