android 檢測USB是U盤還是外設

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UsbManager manager = (UsbManager) getSystemService(Context.USB_SERVICE);

        HashMap<String, UsbDevice> deviceList = manager.getDeviceList();

        Iterator<UsbDevice> deviceIterator = deviceList.values().iterator();

        StringBuilder sb = new StringBuilder();
        while (deviceIterator.hasNext()){
            UsbDevice usbDevice = deviceIterator.next();
            sb.append("DeviceName="+usbDevice.getDeviceName()+"\n");
            sb.append("DeviceId="+usbDevice.getDeviceId()+"\n");
            sb.append("VendorId="+usbDevice.getVendorId()+"\n");
            sb.append("ProductId="+usbDevice.getProductId()+"\n");
            sb.append("DeviceClass="+usbDevice.getDeviceClass()+"\n");
            int deviceClass = usbDevice.getDeviceClass();
            if(deviceClass==0) {
                UsbInterface anInterface = usbDevice.getInterface(0);
                int interfaceClass = anInterface.getInterfaceClass();

                sb.append("device Class 爲0-------------\n");
                sb.append("Interface.describeContents()="+anInterface.describeContents()+"\n");
                sb.append("Interface.getEndpointCount()="+anInterface.getEndpointCount()+"\n");
                sb.append("Interface.getId()="+anInterface.getId()+"\n");
                //http://blog.csdn.net/u013686019/article/details/50409421
                //http://www.usb.org/developers/defined_class/#BaseClassFFh
                //通過下面的InterfaceClass 來判斷到底是哪一種的，例如7就是打印機，8就是usb的U盤
                sb.append("Interface.getInterfaceClass()="+anInterface.getInterfaceClass()+"\n");
                if(anInterface.getInterfaceClass()==7){
                    sb.append("此設備是打印機\n");
                }else if(anInterface.getInterfaceClass()==8){
                    sb.append("此設備是U盤\n");
                }
                sb.append("anInterface.getInterfaceProtocol()="+anInterface.getInterfaceProtocol()+"\n");
                sb.append("anInterface.getInterfaceSubclass()="+anInterface.getInterfaceSubclass()+"\n");
                sb.append("device Class 爲0------end-------\n");
            }

            sb.append("DeviceProtocol="+usbDevice.getDeviceProtocol()+"\n");
            sb.append("DeviceSubclass="+usbDevice.getDeviceSubclass()+"\n");
            sb.append("+++++++++++++++++++++++++++\n");
            sb.append("                           \n");
        }

        textView.setText(sb);
    }

根據不同anInterface.getInterfaceClass()就可以看出來是什麼，我已經試出來3是外設，7是打印機，8是U盤，其他的值，你可以根據與自己的需要，插上看看打印是什麼。