android开发分享Android adb命令设置和获取系统音量

1、查看audio的全部信息（各音频流音量，焦点，策略等）

	dumpsys audio 

2、设置音量并且显示音量UI

	//stream 3表示多媒体，10表示音量值 	media volume --show --stream 3 --set 10 

3、音量调大调小

	media volume --stream 3 --adj raise 	media volume --stream 0 --adj lower 	media volume --show --stream 3 --adj raise 	media volume --show --stream 0 --adj lower 

4、获取当前音量

	media volume --stream 3 --get 

5、直接调用Android接口设置音量

	service call audio 7 i32 3 i32 10 i32 1 

	Here, the service call refers to IAudioService. Click here for more info. 	7 is the function named setStreamVolume. It is the 7th in the list of functions in the interface IAudioService. Verify it here. (setStreamVolume takes 3 parameters streamType, index, flag) 	i32 is to write the integer INT into the send parcel. (Alternatively we can make use of s16 for UTF-16 string) 	3 is streamTypevalue. (Value 1 → phone, 3 → speaker, 4 → alarm, 6 → bluetooth) 	1 is index value and 1 is flag value 

参考文档：
https://android.stackexchange.com/questions/124249/in-call-volume-root-modify?answertab=active#tab-top
https://android.googlesource.com/platform/frameworks/base/+/73e23e2/media/java/android/media/IAudioService.aidl
6、控制播放暂停

	media dispatch play 	media dispatch pause 

详细用法：

usage: media [subcommand] [options]        media dispatch KEY        media list-sessions        media monitor <tag>        media volume [options]  media dispatch: dispatch a media key to the system.                 KEY may be: play, pause, play-pause, mute, headsethook,                 stop, next, previous, rewind, record, fast-forward. media list-sessions: print a list of the current sessions. media monitor: monitor updates to the specified session.                        Use the tag from list-sessions. media volume:  the options are as follows:                 --stream STREAM selects the stream to control, see AudioManager.STREAM_*                                 controls AudioManager.STREAM_MUSIC if no stream is specified                 --set INDEX     sets the volume index value                 --adj DIRECTION adjusts the volume, use raise|same|lower for the direction                 --get           outputs the current volume                 --show          shows the UI during the volume change         examples:                 adb shell media volume --show --stream 3 --set 11                 adb shell media volume --stream 0 --adj lower                 adb shell media volume --stream 3 --get 

参考文档：
https://android.googlesource.com/platform/frameworks/base/+/android-5.1.1_r1/cmds/media/src/com/android/commands/media/Media.java?autodive=0%2F%2F%2F%2F