How to find the path of USB which is mounted to android?

Question

I am working on an android application to read data from USB. The usb can be connected to android with serial port and my app can find it.

Now, I want to read data

Answer 1

get all mounted device by using this code

public String getStoragepath() {
    try {
        Runtime runtime = Runtime.getRuntime();
        Process proc = runtime.exec("mount");
        InputStream is = proc.getInputStream();
        InputStreamReader isr = new InputStreamReader(is);
        String line;
        String[] patharray = new String[10];
        int i = 0;
        int available = 0;

        BufferedReader br = new BufferedReader(isr);
        while ((line = br.readLine()) != null) {
            String mount = new String();
            if (line.contains("secure"))
                continue;
            if (line.contains("asec"))
                continue;

            if (line.contains("fat")) {// TF card
                String columns[] = line.split(" ");
                if (columns != null && columns.length > 1) {
                    mount = mount.concat(columns[1] + "/requiredfiles");

                    patharray[i] = mount;
                    i++;

                    // check directory is exist or not
                    File dir = new File(mount);
                    if (dir.exists() && dir.isDirectory()) {
                        // do something here

                        available = 1;
                        finalpath = mount;
                        break;
                    } else {

                    }
                }
            }
        }
        if (available == 1) {

        } else if (available == 0) {
            finalpath = patharray[0];
        }

    } catch (Exception e) {

    }
    return finalpath;
}