MainActivity

package com.example.portal_informasi;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.widget.Toast;

import com.example.portal_informasi.KONEKSI.ApiServices;
import com.example.portal_informasi.KONEKSI.InitRetrofit;
import com.example.portal_informasi.RESPONSE.BeritaItem;
import com.example.portal_informasi.RESPONSE.ResponseBerita;

import java.util.List;

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;

public class MainActivity extends AppCompatActivity {

    // Deklarasi Widget
    private RecyclerView recyclerView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        recyclerView = (RecyclerView) findViewById(R.id.rvListBerita);
        // RecyclerView harus pakai Layout manager
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        LinearLayoutManager llm = new LinearLayoutManager(this);
        llm.setOrientation(LinearLayoutManager.VERTICAL);

        // Eksekusi method
        tampilBerita();
    }
        private void tampilBerita() {
            ApiServices api = InitRetrofit.getInstance();
            // Siapkan request
            Call<ResponseBerita> beritaCall = api.request_show_all_berita();
            // Kirim request
            beritaCall.enqueue(new Callback<ResponseBerita>() {
                @Override
                public void onResponse(Call<ResponseBerita> call, Response<ResponseBerita> response) {
                    // Pasikan response Sukses
                    if (response.isSuccessful()){
                        Log.d("response api", response.body().toString());
                        // tampung data response body ke variable
                        List<BeritaItem> data_berita = response.body().getBerita();
                        boolean status = response.body().isStatus();
                        // Kalau response status nya = true
                        if (status){
                            // Buat Adapter untuk recycler view
                            AdapterBerita adapter = new AdapterBerita(MainActivity.this, data_berita);
                            recyclerView.setAdapter(adapter);
                        } else {
                            // kalau tidak true
                            Toast.makeText(MainActivity.this, "Tidak ada berita untuk saat ini", Toast.LENGTH_SHORT).show();
                        }
                    }
                }
                @Override
                public void onFailure(Call<ResponseBerita> call, Throwable t) {
                    // print ke log jika Error
                    t.printStackTrace();
                }
            });
        }
    }