android5.1 ????????????????????????????????????

Posted 2021-01-02

?????????music   base   ??????   audio   ????????????   tag   nbsp   android   end   

???????????????frameworks/base/media/java/android/media/Audioservice.java?????????

private int getActiveStreamType(int suggestedStreamType) {         
   
??????...............
??????...............
?????? else if (suggestedStreamType == AudioManager.USE_DEFAULT_STREAM_TYPE) {

                /* carroll ?????????????????????????????????????????? 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 ?????????????????????????????????????????? end */
            }
            break;
        }
        if (DEBUG_VOL) Log.v(TAG, "getActiveStreamType: Returning suggested type "
                + suggestedStreamType);
        return suggestedStreamType;
    }

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