Android Network library
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This document discusses different approaches to making HTTP requests and parsing JSON responses in Android applications. It first shows the traditional approach using HttpClient and JSONObject, then introduces several popular libraries that simplify these tasks, including Butterknife, Retrofit, Picasso, RoboSpice and Lombok. It focuses on Retrofit, explaining how to define models, services, make requests using callbacks, and convert responses to Java objects using GSON. The document promotes Retrofit as a simple solution for replacing raw HTTP connections and parsing responses. It ends by providing the author's contact details.
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:
- 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