Android 手机上的 USB MIDI 是做什么用的？怎么用
推荐回答（3个）
如果手机支持OTG，那么你可以通过OTG将键盘（这里的键盘是指作曲的键盘，类似电钢琴，但是他只是按键，没有音源）与手机连结，功能有两种，第一是用键盘在手机上弹奏作曲，第二是用手机作为MIDI设备在电脑上作曲弹奏。
一般是即插即用的。
MIDI的工作原理，MIDI控制命令之一：让指定通道发声——Note On Message。
一个USB MIDI设备可以有很多模块，例如MIDI合成器、MIDI转换器(必须的)、插孔等。本文设计无合成器等模块，只有MIDI插孔和转换器。模块作用： 转换器：将各个插孔和模块连接起来； 插孔 : 是一个抽象概念，供MIDI信息输入输出使用。传递MIDI消息的方法：批量端点，一个批量端点可以传输多路MIDI消息。
在安卓上使用MIDI需要刷机，将官方版的安卓固件升级为官方ICS系统，以三星Galaxy Note 为例，在此Android 设备上通过 USB OTG 线连接一个扩展 USB MIDI 键盘。并且还需要APK应用的支持，如Akai MPK Mini ，希望我们能够看到更多支持 MIDI 键盘演奏功能的 Android 应用。
你好楼主
usb midi键盘 , 相当于控制器，可以控制midi音源~
这个大概玩专业音乐,街头音乐弄的
你普通使用不用理会这东西,用不上的!
USB test: peripheral mode(这种模式下USB从设备是作为一个MIDI键盘！！)
Hardware needed: USB cable, OTG adapter
Android-to-Android
Apps needed: MidiKeyboard on Android device under test, MidiScope on another Android device.
Use Android devices as a peripheral controller for another Android device. To help test this mode, use another Android device running in host mode. Note that you could modify the test to work with a desktop computer running Digital Audio Workstation (DAW) software such as GarageBand.
Connect the USB cable to the Android device under test (Android device A).
Use an OTG adapter to connect the other end of the cable to a second Android device B that operates in host mode.
On Android device A:
Drag finger down from top of screen.
Select USB for Charging icon.
Select MIDI.
Launch MidiKeyboard app.
Select Android USB Peripheral Port from Receiver for Keys menu at top.
On Android device B:
Launch MidiScope app.
Select the other Android device as the source.
On Android device A:
Play notes on the keyboard and look for NoteOn and NoteOff on Android device B.
另外文章里还介绍了 MIDI 可以走 USB Host Mode/USB Peripheral Mode/BLE, 以及相应的测试方法.
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