Android: how to detect an already connected USB device?
I am trying to detect USB devices that are already connected to Android. I understand there are actions to detect when USB is plugged in or unplugged. But I really don't understand how to check devices after connecting USB device to Android. Also, I found that every USB device has a device class code, but how can I tell which device is connected? For example, I need to detect a usb mouse and keyboard; how to distinguish them?
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2 answers
Try the following:
- First Broadcast register for USB connection. manifest resolution:
:
<intent-filter> <action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" /> </intent-filter>
-
Get a list of USB devices with detailed information using this
public void getDetail() { UsbManager manager = (UsbManager) getSystemService(Context.USB_SERVICE); HashMap<String, UsbDevice> deviceList = manager.getDeviceList(); Iterator<UsbDevice> deviceIterator = deviceList.values().iterator(); while (deviceIterator.hasNext()) { UsbDevice device = deviceIterator.next(); manager.requestPermission(device, mPermissionIntent); String Model = device.getDeviceName(); int DeviceID = device.getDeviceId(); int Vendor = device.getVendorId(); int Product = device.getProductId(); int Class = device.getDeviceClass(); int Subclass = device.getDeviceSubclass(); }}
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Just to answer Benny's question, here's what mPermissionIntent might look like:
string actionString = context.PackageName + ".action.USB_PERMISSION";
PendingIntent mPermissionIntent = PendingIntent.GetBroadcast(context, 0, new
Intent(actionString), 0);
mUsbManager.RequestPermission(device, permissionIntent);
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