Locally call RESTful Web Service generated by NetB

Question

so the NetBeans IDE can generate RESTful Web Service from database (the table has been packed into an entity class). I followed this tutorial and the RESTful Web Service has been generated successfully.

Now, I would like to call from my Android app, but no luck so far. I used "Android Asynchronous Http Client A Callback-Based Http Client Library for Android"

So here is my code snippet:

customActionBarView.findViewById(R.id.actionbar_done).setOnClickListener(
                new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        // "Done"
                        String id = generateId();
                        EditText number = (EditText) findViewById(R.id.caller_phone_number);
                        EditText information = (EditText) findViewById(R.id.caller_information);

                        checkAvailability(id, number.getText().toString(), information.getText().toString());

                        finish();
                    }
                });

and this:

 public void processWebServices(RequestParams params) {
        AsyncHttpClient client = new AsyncHttpClient();
        client.post("http://localhost:8080/AndroidRESTful/com.erikchenmelbourne.entities.caller/create", params, new AsyncHttpResponseHandler() {
            @Override
            public void onSuccess(int statusCode, Header[] headers, byte[] response) {
                try {
                    JSONObject obj = new JSONObject(response.toString());
                    if (obj.getBoolean("status")) {
                        setDefaultValues();
                        Toast.makeText(getApplicationContext(), "Information has been sent!", Toast.LENGTH_LONG).show();
                    } else {
                        Toast.makeText(getApplicationContext(), obj.getString("error_msg"), Toast.LENGTH_LONG).show();
                    }
                } catch (JSONException e) {
                    Toast.makeText(getApplicationContext(), "Error Occured [Server's JSON response is invalid]!", Toast.LENGTH_LONG).show();
                    e.printStackTrace();
                }
            }

            @Override
            public void onFailure(int i, Header[] headers, byte[] bytes, Throwable throwable) {
                if (i == 404) {
                    Toast.makeText(getApplicationContext(), "Requested resource not found", Toast.LENGTH_LONG).show();
                } else if (i == 500) {
                    Toast.makeText(getApplicationContext(), "Something went wrong at server end", Toast.LENGTH_LONG).show();
                } else {
                    Toast.makeText(getApplicationContext(), "Unexpected Error occcured! [Most common Error: Device might not be connected to Internet or remote server is not up and running]", Toast.LENGTH_LONG).show();
                }
            }
        });
    }

and here is NetBeans IDE generated POST method:

 @Path("/create") 
    @POST
    @Consumes({"application/xml", "application/json"})
    public void create(@QueryParam("id") int id, @QueryParam("number") String number, @QueryParam("information") String information) {
    Caller entity = new Caller (id, number, information);
        super.create(entity);
    }

I added the @Path("/create") annotation and modified the method a bit.

Please shed some light, I am fairly new to this so I don't have a clue. I know it is due to some very silly mistakes but please help. The program stops at

"Unexpected Error occcured! [Most common Error: Device might not be connected to Internet or remote server is not up and running]"

. So obvious I couldn't connect the two programs well.

Answer 1

Your HTTP URL is "http://localhost:8080/..." i.e. it expects to reach a server running on the Android device. If your IDE/service is running on your workstation then:

• If you're running the app on the Genymotion emulator use 10.0.3.2 instead of localhost
• If you're running the app on the SDK emulator use 10.0.2.2 instead of localhost
• If you're running the app on a real device then substitute the IP address of your workstation and make sure the device and workstation are on the same network.

References:

• How to access localhost from a Genymotion android emulator
• Emulator Networking