通过 Android 与串行 USB 设备通信
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Communicating with serial USB device over Android
提问by Josef
I have one custom made device for measuring current. This device can be connected to PC and communication is done over USB. It is based on FTDI chip. I have application written in Java and that application is using rxtxSerial.dll library and gnu.io.rxtx_2.1.7.4.jar. Now I want to port this application on my android device and I'm litte bit confused what to do that? All I have is android tablet (os version 4.1.1), OTG cable and this measuring device.
我有一个用于测量电流的定制设备。该设备可以连接到 PC 并通过 USB 进行通信。它基于FTDI芯片。我有用 Java 编写的应用程序，该应用程序使用 rxtxSerial.dll 库和 gnu.io.rxtx_2.1.7.4.jar。现在我想在我的 android 设备上移植这个应用程序，但我有点困惑该怎么做？我只有安卓平板电脑（操作系统版本 4.1.1）、OTG 电缆和这个测量设备。
Should my device be rooted? Is there any kind of library that I can simply add to my Java Android application and read data over USB? Where to start?
我的设备应该植根吗？是否有任何类型的库可以简单地添加到我的 Java Android 应用程序并通过 USB 读取数据？从哪儿开始？
I have tried to port existing application for PC using same library, but rxtxSerial.dll is missing and I can't transfer it to my android device.
我曾尝试使用相同的库为 PC 移植现有应用程序，但缺少 rxtxSerial.dll，我无法将其传输到我的 android 设备。
回答by Frank D.
回答by yegorich
There is a project dedicated to serial communication on Android. android-serialport-api. I think, it is a good resource to start with.
有一个专用于 Android 上的串行通信的项目。android-serialport-api。我认为，这是一个很好的资源。
FTDI also provides Android related resources.
FTDI 还提供 Android 相关资源。
回答by Jakub Turcovsky
I think there's currently only one properly maintained library for serial USB communication and it's felHR85/UsbSerial. It supports several USB chips including FTDI (see Devices Supported).
我认为目前只有一个正确维护的用于串行 USB 通信的库，它是felHR85/UsbSerial。它支持多种 USB 芯片，包括 FTDI（请参阅支持的设备）。
Unfortunately mik3y/usb-serial-for-androidseems to be dead.
不幸的是mik3y/usb-serial-for-android似乎已经死了。
And no, you don't need to root your device for connecting to and communicating with a USB device.
不，您无需根植您的设备即可连接到 USB 设备并与之通信。
EDIT:We have a maintained fork of mik3y's library. See kai-morich/usb-serial-for-android
编辑：我们有一个维护的 mik3y 库的分支。参见kai-morich/usb-serial-for-android
EDIT2:It seems that all of these libraries are maintained again, mik3y joined forces with kai-morich and they are working together.
EDIT2：似乎所有这些库都再次维护，mik3y 与 kai-morich 联手，他们正在合作。
