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：
/questions/124249/in-call-volume-root-modify?answertab=active#tab-top
/platform/frameworks/base/+/73e23e2/media/java/android/media/
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
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：
/platform/frameworks/base/+/android-5.1.1_r1/cmds/media/src/com/android/commands/media/?autodive=0%2F%2F%2F%2F
本文地址：/Sunxiaolin2016/article/details/108843716