如何在Android Things上安装USB驱动器? [英] How to mount a USB drive on Android Things?

问题描述

我正在尝试从 Raspberry Pi 上的 Android Things 应用程序的USB驱动器中读取文件.我可以像这样扫描已挂载设备的列表:

I'm attempting to read files off of a USB drive for an Android Things app on a Raspberry Pi. I'm able to scan the list of mounted devices like so:

public static List<File> ScanForFiles(Context context){
    ArrayList<File> files = new ArrayList<>();
    try{
        BufferedReader reader = new BufferedReader(new FileReader("/proc/self/mountinfo"));
        String line;
        while ((line = reader.readLine()) != null) {
            String[] columns = line.split(" ");
            Log.i(TAG, "Mounted: " + columns[4]);
            //files.addAll(getListFiles(new File(columns[4])));
        }
    } catch (Exception ex){
        ex.printStackTrace();
    }

    printFileInformation("/proc/partitions");

    return files;
}

private static void printFileInformation(String fileName){
    Log.i("TitanTV", "Reading contents of " + fileName);

    try{
        BufferedReader reader = new BufferedReader(new FileReader(fileName));
        String line;
        while ((line = reader.readLine()) != null){
            Log.i("TitanTV", line);
        }
    } catch (Exception ex){
        ex.printStackTrace();
    }
}

显示以下输出:

I: Mounted: /
I: Mounted: /dev
I: Mounted: /dev
I: Mounted: /dev/pts
I: Mounted: /dev/memcg
I: Mounted: /dev/cpuctl
I: Mounted: /proc
I: Mounted: /sys
I: Mounted: /sys/fs/selinux
I: Mounted: /sys/fs/pstore
I: Mounted: /acct
I: Mounted: /mnt
I: Mounted: /mnt/runtime/default/emulated
I: Mounted: /mnt/runtime/read/emulated
I: Mounted: /mnt/runtime/write/emulated
I: Mounted: /config
I: Mounted: /data
I: Mounted: /oem
I: Mounted: /gapps
I: Mounted: /storage
I: Mounted: /storage/emulated
I: Mounted: /storage/self

I: Reading contents of /proc/partitions
I: major minor  #blocks  name
I:    1        0       8192 ram0
I:    1        1       8192 ram1
I:    1        2       8192 ram2
I:    1        3       8192 ram3
I:    1        4       8192 ram4
I:    1        5       8192 ram5
I:    1        6       8192 ram6
I:    1        7       8192 ram7
I:    1        8       8192 ram8
I:    1        9       8192 ram9
I:    1       10       8192 ram10
I:    1       11       8192 ram11
I:    1       12       8192 ram12
I:    1       13       8192 ram13
I:    1       14       8192 ram14
I:    1       15       8192 ram15
I:  179        0    7761920 mmcblk0
I:  179        1      65536 mmcblk0p1
I:  179        2       1024 mmcblk0p2
I:  179        3       1024 mmcblk0p3
I:  179        4      32768 mmcblk0p4
I:  179        5      32768 mmcblk0p5
I:  179        6     524288 mmcblk0p6
I:  179        7     524288 mmcblk0p7
I:  179        8         64 mmcblk0p8
I:  179        9         64 mmcblk0p9
I:  179       10       1024 mmcblk0p10
I:  179       11      32768 mmcblk0p11
I:  179       12      32768 mmcblk0p12
I:  179       13     262144 mmcblk0p13
I:  179       14     262144 mmcblk0p14
I:  179       15    2683736 mmcblk0p15
I:    8        0    7847935 sda
I:    8        1    7845888 sda1

但是，我的拇指驱动器不在列表中.所以我想我需要以某种方式安装它.如何安装拇指驱动器并访问其中的文件?

However, my thumb drive isn't apart of the list. So I'm guessing I need to mount it in some way. How can I mount the thumb drive and access the files on it?

推荐答案

仅限ADB解决方案

似乎到目前为止，尚未自动安装USB驱动器.为了使您的代码正常工作，我必须手动安装它.

Seem like as of now USB drives aren't mounted automatically. In order to make your code work I had to mount it manually.

您可以在/proc分区中(从/proc/partitions中看到)将USB驱动器检测为sda.

As you can see (from /proc/partitions) in the /proc partition the USB drive is detected as sda.

ADB安装

• 创建要挂载的目录

• Make a directory to mount to

mkdir /mnt/usb

安装设备

Mount the device

mount -t vfat -o rw /dev/block/sda1 /mnt/usb

现在，您应该能够通过ADB以及从应用程序内部列出(和管理)USB驱动器上的文件(/mnt/usb也将被记录).

Now you should be able to list (and manage) the files on the USB drive both via ADB and from within the app (/mnt/usb will also be logged).

这篇关于如何在Android Things上安装USB驱动器?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！