usb event broadcastreceiver

    public void registerUSBBroadcastReceiver() {

        IntentFilter intentFilter = new IntentFilter();

        intentFilter.addAction(UsbManager.ACTION_USB_STATE);

        BroadcastReceiver mReceiver = new BroadcastReceiver() {

            @Override

            public void onReceive(Context context, Intent intent) {

                String action = intent.getAction();

                if (action.equals(UsbManager.ACTION_USB_STATE)) {

                    Bundle extras = intent.getExtras();

                    boolean usbConnected = extras.getBoolean(UsbManager.USB_CONNECTED);

                    if(usbConnected){

                        Toast.makeText(getApplicationContext(), "usb connected", Toast.LENGTH_SHORT).show();

                        mIsUsbConnected = true;

                    }else{

                        Toast.makeText(getApplicationContext(), "usb disconnected", Toast.LENGTH_SHORT).show();

                        mIsUsbConnected = false;

                    }

                }

            }

        };

        registerReceiver(mReceiver, intentFilter);

    }