android.media.AudioManager.setStreamVolume(int 流类型, int 索引, int 标志)
我正在尝试更改通知的音量，但不更改铃声。 但是，当我使用此功能时，通知和铃声音量会发生变化。
示例代码：
AudioManager mAudioManager = (AudioManager) getSystemService(AUDIO_SERVICE);
int volNot = mAudioManager.getStreamVolume(STREAM_NOTIFICATION);
int volRing = mAudioManager.getStreamVolume(STREAM_RING);
Log.d(volNot + "," + volRing, "not, ringer");
mAudioManager.setStreamVolume(STREAM_NOTIFICATION, 1, 0);
volNot = mAudioManager.getStreamVolume(STREAM_NOTIFICATION);
volRing = mAudioManager.getStreamVolume(STREAM_RING);
Log.d(volNot + "," + volRing, "not, ringer");
对于结果 setStreamVolume(STREAM_NOTIFICATION, 1, 0) 将 notifications(STREAM_NOTIFICATION) 的值更改为 1，但它也会更改 ringer(STREAM_RING) 的值 到 1。
I am trying to change volume of notifications, but not ringer.
However, when I use this function notification and ringer volume are changed.
Example code:
AudioManager mAudioManager = (AudioManager) getSystemService(AUDIO_SERVICE);
int volNot = mAudioManager.getStreamVolume(STREAM_NOTIFICATION);
int volRing = mAudioManager.getStreamVolume(STREAM_RING);
Log.d(volNot + "," + volRing, "not, ringer");
mAudioManager.setStreamVolume(STREAM_NOTIFICATION, 1, 0);
volNot = mAudioManager.getStreamVolume(STREAM_NOTIFICATION);
volRing = mAudioManager.getStreamVolume(STREAM_RING);
Log.d(volNot + "," + volRing, "not, ringer");
For result setStreamVolume(STREAM_NOTIFICATION, 1, 0) changes value of notifications(STREAM_NOTIFICATION) to 1, but it also changes value of ringer(STREAM_RING) to 1.
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这是因为手机在声音中有一个设置--->其中有一个复选框被选中，取消选中它并再次尝试您的代码，此设置表示铃声音量将是您的通知音量，反之亦然。
This is because the phone has a setting in sounds---> volume in which there is a tick box which is checked, uncheck it and try your code again, this setting says that the ringer volume will be your notification volume and visa-verse.
从ICS（Android 4.0）开始，Ringer和Notification共享官方Android ROMS中的音量流。在此之前，用户可以选择拆分流。
Since ICS (Android 4.0), Ringer and Notification shares volume stream in official Android ROMS. Before this, user could choose to split the streams.