Android network library - retrofit - simple explanation how to use and best practice

1. Awesome
Android Network Library

2. Old Times - Connect HTTP Protocol
HttpParams httpParameters = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(httpParameters, 10000);
HttpConnectionParams.setSoTimeout(httpParameters, 5000);
HttpClient client = new DefaultHttpClient(httpParameters);
HttpGet post = new HttpGet(urlString);
HttpResponse responseGET;
try {
responseGET = client.execute(post);
HttpEntity resEntity = responseGET.getEntity();
if (resEntity != null) {
String resEntityString = EntityUtils.toString(resEntity);
return resEntityString;
}
} catch (Exception e) {
e.printStackTrace();
}

3. Old Times - JSON Converter
JSONObject jsonObject = new JSONObject(data);
String questionId = jsonObject.getString(PARAMETER1);
String questionName = jsonObject.getString(PARAMETER2);
String questionOther = jsonObject.getString(PARAMETER3);
JSONArray jarr = new JSONArray(jsonObject.getString(JSON_CONTENT))
ArrayList<ChoiceModel> choiceItem = new ArrayList<ChoiceItemModel>();
for (int i = 0; i < jarr.length(); i++){
JSONObject jo = jarr.getJSONObject(i);
ChoiceItemModel item = new ChoiceItemModel();
item.setQuestionId(questionId);
item.setChoiceName(jo.getString(JSON_CHOICE));
item.setChoiceOther(jo.getInt(JSON_CHOICE_OTHER));
surveyItem.add(item);
}

4. “Don’t reinvent the wheel”
— Naïve Man

5. Butterknife
Retrofit (Network)
Picasso (Image download and cache handler)
RoboSpice (Asynchronous lib)
Lombok
RetroLambda
Libs:

6. Never again:
HttpConnection
Retrofit

7. ➢ Model (POJO)
➢ Interface Service
➢ Adapter / Call
➢ Converter such as GSON
Retrofit

8. public class Question {
private String question;
private String url;
public String getQuestion() {
return question;
}
public String getUrl() {
return url;
}
}
Retrofit (Model POJO)

9. public interface RetrofitRequestService {
@GET("/questions")
Call<List<Question>> ques();
}
Retrofit (Service Interface)

10. Retrofit mRestAdapter = new Retrofit
.Builder()
.baseUrl("http://private-9adb36-crashback.apiary-mock.com/")
.addConverterFactory(GsonConverterFactory.create())
.build();
service = mRestAdapter.create(RetrofitRequestService.class);
Retrofit (Adapter / Call)

11. Call<List<Question>> call = service.ques();
//call on another thread not in main thread
call.enqueue(new Callback<List<Question>>() {
@Override
public void onResponse(Call<List<Question>> call, Response<List<Question>> response) {
System.out.println("Question = " + response.body().get(0).getQuestion());
System.out.println("url = " + response.body().get(0).getUrl());
}
@Override
public void onFailure(Call<List<Question>> call, Throwable t) {
}
});
Retrofit (Adapter / Call)

12. “Simple, it is wrapped”
— Naïve Man

13. https://github.com/faren/Retrofit
https://id.linkedin.com/in/farenfaren
http://slideshare.net/farenfa
attr

14. faren.faren@gmail.com
Dev Manager Tiket.com
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