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I would like to exchange data/commands between a camera and an Android tablet device using the bulkTransfer function. I wrote this Activity, but the method bulkTransfer returns -1 (error status). Why does it return the error? public class MainActivity extends Activity { private TextView text; private int TIMEOUT = 1000; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); text = (TextView) findViewById(R.id.txt); usbTest(); } private void usbTest() { UsbDevice device = (UsbDevice) getIntent().getParcelableExtra( UsbManager.EXTRA_DEVICE); if (device == null) text.setText("device null"); else text.setText("device not null"); UsbManager manager = (UsbManager) getSystemService(Context.USB_SERVICE); HashMap<String, UsbDevice> deviceList = manager.getDeviceList(); text.setText(text.getText() + "\nDevices connected: " + deviceList.values().size()); Iterator<UsbDevice> deviceIterator = deviceList.values().iterator(); while (deviceIterator.hasNext()) { device = deviceIterator.next(); text.setText(text.getText() + "\nDevice name: " + device.getDeviceName()); text.setText(text.getText() + "\nDevice protocol: " + device.getDeviceProtocol()); text.setText(text.getText() + "\nDevice id: " + device.getDeviceId()); text.setText(text.getText() + "\nDevice product id: " + device.getProductId()); text.setText(text.getText() + "\nDevice vendor id: " + device.getVendorId()); text.setText(text.

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