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文件路径下 \frameworks\base\media\java\android\media\AudioSystem.java

    /**
    * M: modify the default stream volume
    */
    public static int[] DEFAULT_STREAM_VOLUME = new int[] {
        4,   // STREAM_VOICE_CALL
        15,  // STREAM_SYSTEM
        8,   // STREAM_RING
        8,   // STREAM_MUSIC
        8,   // STREAM_ALARM
        8,   // STREAM_NOTIFICATION
        7,   // STREAM_BLUETOOTH_SCO
        15,  // STREAM_SYSTEM_ENFORCED
        11,  // STREAM_DTMF
        11,  // STREAM_TTS
        11  // STREAM_ACCESSIBILITY
    };