Android中，第三方app获取设备挂载的U盘路径的方法有哪些？给出java代码，Android8.0以上

1. 使用StorageManager获取U盘路径

StorageManager storageManager = (StorageManager) getSystemService(Context.STORAGE_SERVICE);
List<VolumeInfo> volumes = storageManager.getVolumes();
for (VolumeInfo volume : volumes) {
    if (volume.getType() == VolumeInfo.TYPE_PUBLIC && volume.getState() == VolumeInfo.STATE_MOUNTED) {
        File uDiskFile = volume.getPath();
        Log.d(TAG, "U盘路径：" + uDiskFile.getAbsolutePath());
    }
}

2. 使用UsbManager获取U盘路径

UsbManager usbManager = (UsbManager) getSystemService(Context.USB_SERVICE);
HashMap<String, UsbDevice> deviceList = usbManager.getDeviceList();
Iterator<UsbDevice> iterator = deviceList.values().iterator();
while (iterator.hasNext()) {
    UsbDevice usbDevice = iterator.next();
    if (usbDevice.getVendorId() == VENDOR_ID && usbDevice.getProductId() == PRODUCT_ID) {
        String path = null;
        for (int i = 0; i < usbDevice.getInterfaceCount(); i++) {
            UsbInterface usbInterface = usbDevice.getInterface(i);
            if (usbInterface.getInterfaceClass() == UsbConstants.USB_CLASS_MASS_STORAGE
                    && usbInterface.getInterfaceSubclass() == INTERFACE_SUBCLASS
                    && usbInterface.getInterfaceProtocol() == INTERFACE_PROTOCOL) {
                UsbEndpoint endpoint = usbInterface.getEndpoint(0);
                UsbDeviceConnection connection = usbManager.openDevice(usbDevice);
                if (connection != null && connection.claimInterface(usbInterface, true)) {
                    byte[] buffer = new byte[MAX_BUFFER_SIZE];
                    int result = connection.bulkTransfer(endpoint, buffer, buffer.length, BULK_TRANSFER_TIMEOUT_MS);
                    if (result > 0) {
                        path = new String(buffer, 0, result);
                        Log.d(TAG, "U盘路径：" + path);
                        break;
                    }
                }
            }
        }
        if (path != null) {
            break;
        }
    }
}

注意：需要在AndroidManifest.xml中添加以下权限

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.USB_PERMISSION" />