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();
}
}
Which displays the following output:
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
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?
ADB ONLY SOLUTION
Seem like as of now USB drives aren't mounted automatically. In order to make your code work I had to mount it manually.
As you can see (from /proc/partitions) in the /proc partition the USB drive is detected as sda.
ADB mounting
Make a directory to mount to
mkdir /mnt/usb
Mount the device
mount -t vfat -o rw /dev/block/sda1 /mnt/usb
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).