Google+ Integration - Adding a Coffee

At this stage, we've made a few simple GET requests on the Server - now let's make some POST Requests and add a coffee to our list.

The first thing we need to do is update our CoffeeApi class and add in a new method to allow us to POST our coffee to the server, so open up your CoffeeApi.java and add the following:

public static void post(String url,Coffee aCoffee) { 
    Log.v(TAG, "POSTing to : " + url); 
    Type objType = new TypeToken<Coffee>(){}.getType(); 
    String json = new Gson().toJson(aCoffee, objType); 
    JSONObject jsonObject = null; 

    try { 
        jsonObject = new JSONObject(json); 
        } 
    catch (JSONException e) { 
        e.printStackTrace(); 
       }     

    JsonObjectRequest gsonRequest = new JsonObjectRequest( Request.Method.POST, hostURL + url, jsonObject, 
            new Response.Listener<JSONObject>() { 
                @Override 
                public void onResponse(JSONObject response) { 
                    Log.v(TAG, "insert new Coffee " + response.toString()); 
                    } 
            }, 
            new Response.ErrorListener() { 
                @Override 
                public void onErrorResponse(VolleyError error) { // Handle Error 
                    Log.v(TAG, "Unable to insert new Coffee"); 
                } 
            }) { 

        @Override 
        public Map<String, String> getHeaders() throws AuthFailureError { 
               HashMap<String, String> headers = new HashMap<String, String>(); 
               headers.put("Content-Type", "application/json; charset=utf-8"); 
               //headers.put("User-agent", System.getProperty("http.agent")); return headers; } }; 

    // Add the request to the queue 
    Base.app.add(gsonRequest);
}

Fix any import errors you have and take some time to investigate how this method achieves our goal of

• accepting a coffee object as a parameter
• converting this object into a JSON String (using Gson)
• POSTing this JSON String to the server

You can always ask the Lecturer for some more detail if necessary.

The next thing we need to do is refactor our Add Fragment and integrate our APi class so open up your AddFragment.java and have a go at implementing what we need.

There's actually verry little to this so if you've added the necessary code correctly, you should be able to add a coffee in the same way as in CoffeeMate.4.0 but this time, the coffee is added to the list of your coffees on the server NOT on the device (via the database).

And don't worry, the solution is next :)