在此示例中，我使用的是来自Apache的FileUtils，但是如果不使用它，您将看到用于读取USB闪存驱动器的逻辑：
private UsbManager usbManager;private UsbDevice clef;ArrayList<File> images;usbManager = (UsbManager) getSystemService(Context.USB_SERVICE);clef = null;if (usbManager != null){ HashMap<String,UsbDevice> deviceList = usbManager.getDeviceList(); if (deviceList != null) { Iterator<UsbDevice> deviceIterator = deviceList.values().iterator(); while (deviceIterator.hasNext()) { clef = deviceIterator.next(); } }}if (clef != null){ File directory = new File("/storage/UsbDriveA/"); if (directory != null) { if (directory.canRead()) { images = new ArrayList<File>(); String[] imageExtensions = {"jpg","jpeg","png","gif","JPG","JPEG","PNG","GIF"}; Iterator<File> iterateImages = FileUtils.iterateFiles(directory, imageExtensions, true); while (iterateImages.hasNext()) { File theImage = iterateImages.next(); if (!theImage.getName().startsWith(".", 0)) images.add(theImage); } // custom process / methods... not very relevant here : imageIndex = 0; scale = 1.0f; countImgs = images.size(); loadImage(imageIndex); } }}In my manifest I have those lines, although I’m not sure they’re all
mandatory…
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /><uses-feature android:name="android.hardware.usb.host" /><uses-permission android:name="android.permission.USB_PERMISSION" /><uses-permission android:name="android.permission.WRITE_SETTINGS" />
