settings 声音

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音量键+-

02-16 18:21:15.663  4645  4812 I vol.Events: writeEvent active_stream_changed STREAM_RING
02-16 18:21:15.666  4645  4812 I vol.Events: writeEvent key STREAM_RING 3

frameworks/base/packages/SystemUI/src/com/android/systemui/volume/Events.java:58:        "active_stream_changed",

frameworks/base/packages/SystemUI/src/com/android/systemui/volume/VolumeDialog.java

frameworks/base/packages/SystemUI/src/com/android/systemui/volume/VolumeDialogController.java

Settings

SoundSettings.java

SummaryProvider   //面板的提示语

onReceive()

AudioManager.java

getStreamVolume()

getStreamMaxVolume

AudioSystem.java

    public static int[] DEFAULT_STREAM_VOLUME = new int[] {
        4,  // STREAM_VOICE_CALL
        7,  // STREAM_SYSTEM
        5,  // STREAM_RING
        11, // STREAM_MUSIC
        6,  // STREAM_ALARM
        5,  // STREAM_NOTIFICATION
        7,  // STREAM_BLUETOOTH_SCO
        7,  // STREAM_SYSTEM_ENFORCED
        11, // STREAM_DTMF
        11  // STREAM_TTS
    };

AudioService.java

   /** Maximum volume index values for audio streams */
    private static int[] MAX_STREAM_VOLUME = new int[] {
        5,  // STREAM_VOICE_CALL
        7,  // STREAM_SYSTEM
        7,  // STREAM_RING
        15, // STREAM_MUSIC
        7,  // STREAM_ALARM
        7,  // STREAM_NOTIFICATION
        15, // STREAM_BLUETOOTH_SCO
        7,  // STREAM_SYSTEM_ENFORCED
        15, // STREAM_DTMF
        15  // STREAM_TTS
    };

    /** Minimum volume index values for audio streams */
    private static int[] MIN_STREAM_VOLUME = new int[] {
        1,  // STREAM_VOICE_CALL
        0,  // STREAM_SYSTEM
        0,  // STREAM_RING
        0,  // STREAM_MUSIC
        0,  // STREAM_ALARM
        0,  // STREAM_NOTIFICATION
        0,  // STREAM_BLUETOOTH_SCO
        0,  // STREAM_SYSTEM_ENFORCED
        0,  // STREAM_DTMF
        0   // STREAM_TTS
    };

getStreamVolume()

getStreamMaxVolume()