private int getActiveStreamType(int suggestedStreamType) {         

　　...............
　　...............
　　 else if (suggestedStreamType == AudioManager.USE_DEFAULT_STREAM_TYPE) {

                /* carroll 修改音量键默认调节多媒体音量 start */

                /*   if (isAfMusicActiveRecently(StreamOverride.sDelayMs)) {

                    if (DEBUG_VOL) Log.v(TAG, "getActiveStreamType: forcing STREAM_MUSIC");*/

                    return AudioSystem.STREAM_MUSIC;

                /* } else {

                    if (DEBUG_VOL) Log.v(TAG,

                            "getActiveStreamType: using STREAM_NOTIFICATION as default");

                    return AudioSystem.STREAM_NOTIFICATION;

                }*/

                /* carroll 修改音量键默认调节多媒体音量 end */

            }

            break;

        }

        if (DEBUG_VOL) Log.v(TAG, "getActiveStreamType: Returning suggested type "

                + suggestedStreamType);

        return suggestedStreamType;

    }