Twilio's Device.connect method returns null connection in Android

Question

I am following Twilio's Android quickstart tutorial for an Android app. Here is the link to the tutorial: https://www.twilio.com/docs/quickstart/php/android-client/make-outgoing-call

I am trying to make an outgoing call. I have set up a trial account with a Twiml application. I have set the URL to the token, and the URL to the /call endpoint that serves Twilio's xml.

I am receiving the token, and the Device object's status is ready.

But whenever I call Device.connect, I get the following errors: Connecting new call failed java.lang.NullPointerExpection at java util.HashMap.

Here is the code I am using:

Connection connection = device.connect(null /* parameters */, null /* ConnectionListener */);
                        if (connection == null){
                            Log.e("failed to connect", "Failed to create new connection");  
                        }

I found the solution. Looks like Twilio does not allow null parameters for the connect method. So I just filled dummy parameters: "To" : "1" , and it worked. — Pacemaker, Apr 06 '15 at 11:03
Yes, just add these before the connect method: Map parameters = new HashMap(); parameters.put("dummy","dummy"); and it should work. It could be a different error, but this solved it for me. — Pacemaker, Jun 02 '15 at 08:52
I cannnot put dummy because I'm sending group id here with the key and value in parameters. — Anshul Tyagi, Jun 02 '15 at 09:00
My application works fine but sometimes it crashes on `connection = device.connect(parameters, null);` — Anshul Tyagi, Jun 02 '15 at 09:01
you can add as many parameters as you need. The idea is that it cannot be null ( or I could be mistaken) . To find the error, you need to place logs in the connection listener to see where exactly it crashes, and what errors it gives. It could be anything! — Pacemaker, Jun 02 '15 at 09:30
I get `java.lang.NullPointerException` here every time when it crashes. — Anshul Tyagi, Jun 02 '15 at 09:36
Can you see exactly where does the NUllPointerException happens? what line? — Pacemaker, Jun 02 '15 at 09:58
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/79420/discussion-between-anshul-tyagi-and-pacemaker). — Anshul Tyagi, Jun 02 '15 at 13:03

score 0 · Answer 1 · answered Jun 30 '15 at 09:42

I also had the same problem but by adding elements to hashmap and passing the map to connect method resolved my problem.
public void connect()
    {
        HashMap<String, String> hash=new HashMap<String, String>();
        hash.put("To", "22");
        connection=device.connect(hash, null);
        if(connection==null)
            Log.w(TAG, "Failed to create new connection");
    }

Twilio's Device.connect method returns null connection in Android

1 Answers1