Rest API data get post: Retrofit retrofit = new Retrofit .Builder() .baseUrl(Constant. base_url ) .addConverterFactory(GsonConverterFactory. create ()) .build() ; retrofitClient = retrofit.create(RetrofitClient. class ) ; Call<OurMainDataClass> call = retrofitClient .getData(Constant. api_token ) ; call.enqueue( new Callback<OurMainDataClass>() { @Override public void onResponse (Call<OurMainDataClass> call , Response<OurMainDataClass> response) { if (response.isSuccessful()) { allcontinentslist =response.body().getData() ; continents_adapter = new Continents_Adapter(MainActivity. this, MainActivity. this, allcontinentslist ) ; // recyclerView.setLayoutManager(new LinearLayoutManager(this,LinearLayoutMana...