java - 如何从 USB pendrive 获取文件？

Question

我在我的设备上添加了一个存储空间作为 USB 笔式驱动器，但我不知道如何从 USB 获取文件。

我试过了，但没用:

HashMap<String, UsbDevice> usbDevices = usbManager.getDeviceList();
HashMap<String, UsbDevice> usbDevices1 = new HashMap<>();
usbDevices1.clear();

if (!usbDevices.isEmpty()) {
    boolean keep = true;
    for (Map.Entry<String, UsbDevice> entry : usbDevices.entrySet()) {
        device = entry.getValue();
        int deviceVID = device.getVendorId();
        int devicePID = device.getProductId();
        if (deviceVID == 1659 && devicePID == 8963) {
            if (deviceVID != 0x1d6b && (devicePID != 0x0001 || devicePID != 0x0002 || devicePID != 0x0003)) {
                // There is a device connected to our Android device. Try to open it as a Serial Port.
                requestUserPermission();
                keep = false;
            } else {
                    connection = null;
                    device = null;
                   }

                   if (!keep)
                       break;
        }
    }
}

Answer 1

USB 闪存驱动器将是您手机上的外部存储设备，您可以使用以下方式从外部存储设备读取文件:

File path = context.getExternalFilesDir(null);

或者使用额外的库:

https://github.com/magnusja/libaums