Android Device, connected to camera on Wi-Fi, has to make RESP API call through 3G/4G

Question

Android Phone is connected to the camera via Wi-Fi. Camera does not have Internet connection. Android Phone communicates with Camera through Wi-Fi. But I need to make Internet requests (REST API) and open a Socket on 3G/4G network, is it possible to do on Android? For iOS, it's not a big deal.

Steps: 1. I find Camera Wi-Fi and connect to it 2. Then I need to do some REST API queries 3. I need to open socenn and start streaming But due to Wi-Fi connection I can not get Internet access through 3G/4G

score 0 · Answer 1 · answered Jun 26 '18 at 12:25

I've found the solution to the problem.

1) It's necessary to add Network then you can make a query

 @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
public void addNetwork() {
    NetworkRequest.Builder req = new NetworkRequest.Builder();
    req.addCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET);
    req.addTransportType(NetworkCapabilities.TRANSPORT_CELLULAR);
    connectivityManager.requestNetwork(req.build(), new ConnectivityManager.NetworkCallback() {
        @Override
        public void onAvailable(Network network) {
            Log.e(TAG, "addNetwork.onAvailable network = " + network.hashCode());
            try {
                // Socket socket = network.getSocketFactory().createSocket();
                URLConnection urlConnection = network.openConnection(new URL("you_url"));
                urlConnection.setRequestProperty(CONTENT_TYPE, CONTENT_TYPE_VALUE);
                urlConnection.setConnectTimeout(TIMEOUT_MILLIS);
                urlConnection.setDoOutput(false);
                urlConnection.setDoInput(true);
                urlConnection.connect();
                InputStream inputStream = urlConnection.getInputStream();
                String responceString = streamToString(inputStream);
            } catch (IOException e) {
                Log.e(TAG, "IOException  network " + e.toString());
            }
            if (networkCallback != null) {
                networkCallback.onAvailable(network);
            }
        }
    });
}

private String streamToString(InputStream is) throws IOException {
    String str = "";
    if (is != null) {
        StringBuilder sb = new StringBuilder();
        String line;
        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(is));
            while ((line = reader.readLine()) != null) {
                sb.append(line);
            }
            reader.close();
        } finally {
            is.close();
        }
        str = sb.toString();
    }
    return str;
}

2) After that our Network appears in ConnectivityManager.getAllNetworks() you can find it by saving or by Network.hashCode()

I've checked this with help of 2 devices

1) device connected to WiFi with no internet access

2) Second device was connected to access point. Note mobile data should be on

Android Device, connected to camera on Wi-Fi, has to make RESP API call through 3G/4G

1 Answers1