Retrofit kutubxonasi yordamida tarmoq so'rovlarini qanday amalga oshirish mumkin?

1. Bog'lanishni qo'shish: build.gradle (app) faylida.

   // Retrofit
   implementation 'com.squareup.retrofit2:retrofit:<latest_version>'
   implementation 'com.squareup.retrofit2:converter-gson:<latest_version>' // yoki boshqa konvertor
   

2. API interfeysini yaratish: Har bir tarmoq so'rovi uchun metodlarni aniqlash.

   interface ApiService {
       @GET("users/{id}")
       Call<User> getUser(@Path("id") int userId);
   
       @POST("users")
       Call<User> createUser(@Body User user);
   }
   

   • @GET, @POST va boshqa anotatsiyalar HTTP metodining turini belgilaydi.
   • "users/{id}" - manbaga nisbatan yo'l.
   • @Path, @Query, @Body - so'rov parametrlari uchun anotatsiyalar.
   • Call<T> - asinxron yoki sinxron so'rovlar uchun qaytish turi.

3. Retrofit nusxasini yaratish: Asosiy URL ni sozlash va konvertor qo'shish.

   Retrofit retrofit = new Retrofit.Builder()
       .baseUrl("https://api.example.com/")
       .addConverterFactory(GsonConverterFactory.create()) // JSON ni tahlil qilish uchun Gson
       .build();
   
   ApiService apiService = retrofit.create(ApiService.class);
   

4. So'rovni bajarish: Asinxron yoki sinxron.

   Asinxron (UI oqimi uchun tavsiya etiladi):

   Call<User> call = apiService.getUser(123);
   call.enqueue(new Callback<User>() {
       @Override
       public void onResponse(Call<User> call, Response<User> response) {
           if (response.isSuccessful()) {
               User user = response.body();
               // Muvaffaqiyatli javobni ishlash
           } else {
               // Xato javobni ishlash (masalan, 404, 500)
           }
       }
   
       @Override
       public void onFailure(Call<User> call, Throwable t) {
           // Tarmoq xatosi yoki istisno
       }
   });
   

   Sinxron (UI oqimida ishlatmang):

   try {
       Response<User> response = apiService.getUser(123).execute();
       if (response.isSuccessful()) {
           User user = response.body();
           // Muvaffaqiyatli javobni ishlash
       } else {
           // Xato javobni ishlash
       }
   } catch (IOException e) {
       // Xatoni ishlash
   }
   

5. Javobni ishlash: onResponse metodlarida yoki execute muvaffaqiyatli bo'lsa. Javob holatini tekshiring (response.isSuccessful()) va ma'lumotlarni oling (response.body()). Xatolarni onFailure yoki catch blokida boshqaring.

Retrofit shuningdek, Kotlin korutinlari bilan integratsiya qilish uchun (retrofit2:retrofit2-kotlin-coroutines-adapter), RxJava (retrofit2:adapter-rxjava) va boshqa kutubxonalar bilan qo'llab-quvvatlaydi.