如何从充当USB大容量存储设备的设备中获取文件路径 [英] How to get the file path from a device acting as a usb mass storage in android

问题描述

我正在尝试从充当USB大容量存储设备的Garmin设备获取文件名(以及文件路径).将设备连接到计算机，文件路径为G:\ Garmin.使用OTG和Explorer将其连接到android平板电脑(我已经检查了应用程序设置-包名称为com.android.rk)，文件路径为USB/Garmin.使用ES File Explorer，我已经看到文件路径是mnt/usb_storage/Garmin.因此，在代码中，当我尝试从文件路径usb_storage/Garmin解析system.xml时，我将文件路径设置如下:

I am trying to get filenames(and also the filepath), from a Garmin device which acts as a usb mass storage. Connecting the device to the computer, the filepath is G:\Garmin. Connecting that to the android tablet using OTG and Explorer(i have check the app setting - the package name is : com.android.rk), the filepath is USB/Garmin. Using ES File Explorer, I have seen that the file path is mnt/usb_storage/Garmin. So in the code, as I am trying to parse the system.xml from the file path usb_storage/Garmin, I have put the filepath like this:

String file = Environment.getExternalStorageDirectory() + "mnt/usb_storage/Garmin/system.xml";

当我运行该应用程序时，它崩溃了，这意味着它找不到文件 system.xml .在通过OTG连接的USB设备中寻找文件时，我使用Environment.getExternalStorageDirectory()是否正确?您能指出我该怎么做吗?非常感谢.

When I run the app, it crashes, meaning that it cannot find the file system.xml. Is it right that I use Environment.getExternalStorageDirectory() when I'm looking for the file in a usb device connected via OTG? Can you please point me to what should be done? Thank you so much.

推荐答案

通过使用Environment.getExternalStorageDirectory()，您实际上是指向sd卡或内部存储器(取决于哪个设置为当前)，并在其下指向. strong>您正在寻找设备安装点.

By using Environment.getExternalStorageDirectory(), you are actually pointing your sd card or internal storage (depending on which is set as current) and under that you are looking for the device mount point.

但是Unix中的挂载点是在根级别上看到的.
因此，请直接尝试/mnt/usb_storage/Garmin/system.xml.

But mount points in Unix are seen at the root level.
Therefore, try directly /mnt/usb_storage/Garmin/system.xml, instead.

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