Android实战之音量获取与设置

墨蓝 2022-05-04 03:28 616阅读 0赞

> 获取和设置安卓音量信息主要使用了到`AudioManager`，通过`getSystemService`拿到`AudioManager`，然后就可以使用其提供的API轻松完成音量值的获取和设置了。

### 获取各类别音量最大值与当前值 ###

fun getVoiceInfo(view: View) { 
            val audioManager = getSystemService(Context.AUDIO_SERVICE) as AudioManager
            // 通话音量
            val callVoiceMax = audioManager.getStreamMaxVolume(AudioManager.STREAM_VOICE_CALL)
            val callVoiceCurrent = audioManager.getStreamVolume(AudioManager.STREAM_VOICE_CALL)
            println("callVoiceMax:$callVoiceMax ,callVoiceCurrent:$callVoiceCurrent")
            // 系统音量
            val systemVoiceMax = audioManager.getStreamMaxVolume(AudioManager.STREAM_SYSTEM)
            val systemVoiceCurrent = audioManager.getStreamVolume(AudioManager.STREAM_SYSTEM)
            println("systemVoiceMax:$systemVoiceMax ,systemVoiceCurrent:$systemVoiceCurrent")
            // 铃声音量
            val ringVoiceMax = audioManager.getStreamMaxVolume(AudioManager.STREAM_RING)
            val ringVoiceCurrent = audioManager.getStreamVolume(AudioManager.STREAM_RING)
            println("ringVoiceMax:$ringVoiceMax ,ringVoiceCurrent:$ringVoiceCurrent")
            // 音乐音量
            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")
        }

输出为：

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

### 设置音量值 ###

> 同理，通过`AudioManager`提供的`setStreamVolume`可轻松完成设置，以音乐音量为例：

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

输出为：

10-22 14:37:30.816 25012-25012/com.happy.deviceinfo.demo I/System.out: 设置前：musicVoiceCurrentBeforeSet:2
    
    10-22 14:37:30.827 25012-25012/com.happy.deviceinfo.demo I/System.out: 设置前：musicVoiceCurrentAfterSet:0