如何在Android Things上安装USB驱动器？

Question

我正在尝试从 Raspberry Pi 上的 Android Things 应用的USB驱动器中读取文件。我可以像这样扫描已安装设备的列表： __

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？

Answer 1

仅亚行解决方案

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

如您所见（从/proc/partitions）在/proc分区中，USB驱动器被检测为sda。

ADB安装

• 制作要挂载的目录

  mkdir /mnt/usb
  

• 安装设备

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

现在，您应该能够通过ADB和应用程序列出（和管理）USB驱动器上的文件（/mnt/usb也将被记录）。