How to call a web api function using URL in Android Studio?

Question

I've already looked at many tutorials, but I am stumped. This is the code I have so far that I've put together from several guides:

protected Boolean doInBackground(Void... params) {
        // TODO: attempt authentication against a network service.

        try {
            // Create URL
            url = baseUrl + "signin?username=" + mEmail + "&password=" + mPassword + "&remember_me=true&accept_terms=true";

            // Next, we create a new JsonArrayRequest. This will use Volley to make a HTTP request
            // that expects a JSON Array Response.
            // To fully understand this, I'd recommend readng the office docs: https://developer.android.com/training/volley/index.html
            JsonArrayRequest arrReq = new JsonArrayRequest(Request.Method.GET, url,
                    new Response.Listener<JSONArray>() {
                        @Override
                        public void onResponse(JSONArray response) {
                            // Check the length of our response 
                            if (response.length() > 0) {
                                for (int i = 0; i < response.length(); i++) {
                                    try {
                                        JSONObject jsonObj = response.getJSONObject(i);
                                        String repoName = jsonObj.get("name").toString();
                                        String lastUpdated = jsonObj.get("updated_at").toString();
                                    } catch (JSONException e) {
                                        // If there is an error then output this to the logs.
                                        Log.e("Volley", "Invalid JSON Object.");
                                    }

                                }
                            } else {
                            }

                        }
                    },

                    new Response.ErrorListener() {
                        @Override
                        public void onErrorResponse(VolleyError error) {
                            // If there a HTTP error then add a note to our repo list.
                            Log.e("Volley", error.toString());
                        }
                    }
            );
            // Add the request we just defined to our request queue.
            // The request queue will automatically handle the request as soon as it can.
            requestQueue.add(arrReq);
            // Simulate network access.
            Thread.sleep(2000);
        } catch (InterruptedException e) {
            return false;
        }

        for (String credential : DUMMY_CREDENTIALS) {
            String[] pieces = credential.split(":");
            if (pieces[0].equals(mEmail)) {
                // Account exists, return true if the password matches.
                return pieces[1].equals(mPassword);
            }
        }

        // TODO: register the new account here.
        return false;
    }

The api I am trying to use is: https://neurofit.me/nfoidc/api/swagger-ui#/ I want to implement a sign in function in my app, so I want to call the signin function. I have the email and password that the user puts in, but there are other parameters like accept-language and user-agent that are called headers.

I am extremely confused as to how I can just send in the email and password and get back a JSON file. I also don't think I am constructing the URL correctly.

Answer 1

As mentioned in my comments, you need to use a POST request and put the values as JSON in the body.

This likely isn't perfect so I was tentative to put an answer, however, it is closer to what you need to do. Someone who has used the library might be able to clean this up a bit.

protected Boolean doInBackground(Void... params) {
    try {
        JsonArrayRequest loginRequest = new JsonArrayRequest(Request.Method.POST, baseUrl, 
                new Response.Listener<JSONArray>() 
                {
                    @Override
                    public void onResponse(JSONArray response) {
                        Log.d("Response", response.toString());
                        if (response.length() > 0) {
                            for (int i = 0; i < response.length(); i++) {
                                try {
                                    JSONObject jsonObj = response.getJSONObject(i);
                                    String repoName = jsonObj.get("name").toString();
                                    String lastUpdated = jsonObj.get("updated_at").toString();
                                } catch (JSONException e) {
                                    // If there is an error then output this to the logs.
                                    Log.e("Volley", "Invalid JSON Object.");
                                }

                            }
                        } else {

                        }
                    }
                }, 
                new Response.ErrorListener() 
                {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        Log.d("Error.Response", error.toString());
                }
            }){     
            @Override
            protected Map<String, String> getParams() 
            {  
                    Map<String, String>  params = new HashMap<String, String>();  
                    params.put("username", mEmail);  
                    params.put("password", mPassword);
                    params.put("remember_me", "true");
                    params.put("accept_terms", "true");
                    return params;  
            }

            @Override
            public Map<String, String> getHeaders() 
            {  
                    Map<String, String>  params = new HashMap<String, String>();  
                    params.put("Content-Type", "application/json");

                    //your api claims to require these below, but it likely  
                    //gets set by volley defaults, try without for starters
                    //then figure out what your API is looking for here if not working

                    //params.put("accept", "text/html"); 
                    //params.put("accept-language", "en-US");
                    //params.put("user-agent", "idk"); 
                    return params;  
            }
        };
        requestQueue.add(loginRequest);

    } catch (InterruptedException e) {
        return false;
    }
    return false;
}