Physical device testing and google-app-engine back-end

Question

I'm following this tutorial to try to make an andorid app with a backend on google app-engine. I'm at the point where I want to test the connection between my app and GAE Api locally so I try to execute the following code on my Nexus 5 phone (not emulated).

MainActivity.java

public class MainActivity extends FragmentActivity {

    private final String DEBUG_TAG = "MainActivity";


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

    /**
     * AsyncTask for calling Mobile Assistant API for checking into a place (e.g., a store)
     */
    private class CheckInTask extends AsyncTask<Void, Void, Void> {
        /**
         * Calls appropriate CloudEndpoint to indicate that user checked into a place.
         *
         * @param params the place where the user is checking in.
         */
        @Override
        protected Void doInBackground(Void... params) {
            CheckIn checkin = new CheckIn();
            // Set the ID of the store where the user is.
            // This would be replaced by the actual ID in the final version of the code.
            checkin.setPlaceId("StoreNo123");
            Checkinendpoint.Builder builder = new Checkinendpoint.Builder(
                    AndroidHttp.newCompatibleTransport(), new JacksonFactory(),
                    null);
            builder = CloudEndpointUtils.updateBuilder(builder);
            Checkinendpoint endpoint = builder.build();
            try {
                endpoint.insertCheckIn(checkin).execute();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            return null;
        }
    }
}

And I get this

Where I shouldget this

_{(source: google.com)}

And the log shows : java.net.SocketTimeoutException: failed to connect to /10.0.2.2 (port 8888) after 20000ms

No CheckIn is available on the "entity kind" list

• I've lauched the appengine locally i get : INFOS: Dev App Server is now running
• I've CloudEndPointUtils.java setting to : LOCAL_ANDROID_RUN = true; LOCAL_APP_ENGINE_SERVER_URL = "http://localhost:8888/"; and LOCAL_APP_ENGINE_SERVER_URL_FOR_ANDROID = "http://10.0.2.2:8888";

I feel like it's because I'm using a physical device for debugging...

What do you think and how to make it work ?

(I can't figure out how run an emulator of android on my computer so if there is another solution that would be great)

Edit: I've tried to deploy the app but I'm having the same issue with the same log error.

Answer 1

This is beacause 10.0.2.2 is the address of localhost when using the emulator. If you want to try it on your device and all your computer and device are connected to the local network, try changing the server address to http://local-network-ip:port/_ah/api. When launching the appengine application set the host address to 0.0.0.0 to make it accessible to other machines on the network.