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package com.example.rvj;

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.os.Bundle;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.Toast;

import java.util.ArrayList;

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;

public class MainActivity extends AppCompatActivity implements CategoryRVAdapter.CategorClickInterface{

    private RecyclerView newsRV,categoryRV;
    private ProgressBar loadingPB;

    private ArrayList<Articles> articlesArrayList;
    private ArrayList<CategoryRVModal> categoryRVModalArrayList;
    private CategoryRVAdapter categoryRVAdapter;
    private NewsRVAdapter newsRVAdapter;


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

        newsRV =findViewById(R.id.idRVNews);
        categoryRV =findViewById(R.id.idRVCategories);
        loadingPB =findViewById(R.id.idPBLoading);

        articlesArrayList =new ArrayList<>();
        categoryRVModalArrayList =new ArrayList<>();

        newsRVAdapter =new NewsRVAdapter(articlesArrayList,this);
        categoryRVAdapter =new CategoryRVAdapter(categoryRVModalArrayList,this,this::onCategoryClick);

        newsRV.setLayoutManager(new LinearLayoutManager(this));
        newsRV.setAdapter(newsRVAdapter);
        categoryRV.setAdapter(categoryRVAdapter);
        getCategories();

        getNews("All");

        newsRVAdapter.notifyDataSetChanged();


    }

    //    geting data for our category.
    private void getCategories(){

        categoryRVModalArrayList.add(new CategoryRVModal("All","https://images.unsplash.com/photo-1477959858617-67f85cf4f1df?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1244&q=80"));
        categoryRVModalArrayList.add(new CategoryRVModal("Technology","https://images.unsplash.com/photo-1518770660439-4636190af475?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxzZWFyY2h8MTR8fHRlY2h8ZW58MHx8MHx8&auto=format&fit=crop&w=500&q=60"));
        categoryRVModalArrayList.add(new CategoryRVModal("Science","https://images.unsplash.com/photo-1611784601826-d17011218c7b?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxzZWFyY2h8Nnx8cGh5c2ljc3xlbnwwfHwwfHw%3D&auto=format&fit=crop&w=500&q=60"));
        categoryRVModalArrayList.add(new CategoryRVModal("Sports","https://images.unsplash.com/photo-1541534741688-6078c6bfb5c5?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxzZWFyY2h8Nnx8c3BvcnR8ZW58MHx8MHx8&auto=format&fit=crop&w=500&q=60"));
        categoryRVModalArrayList.add(new CategoryRVModal("Entertainment","https://images.unsplash.com/photo-1522869635100-9f4c5e86aa37?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1170&q=80"));
        categoryRVModalArrayList.add(new CategoryRVModal("Business","https://images.unsplash.com/photo-1590283603385-17ffb3a7f29f?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxjb2xsZWN0aW9uLXBhZ2V8MTB8OVlzOE1oYkNnOWt8fGVufDB8fHx8&auto=format&fit=crop&w=500&q=60"));
        categoryRVModalArrayList.add(new CategoryRVModal("Health","https://images.unsplash.com/photo-1524863479829-916d8e77f114?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxzZWFyY2h8OHx8eW9nYXxlbnwwfHwwfHw%3D&auto=format&fit=crop&w=500&q=60"));
        categoryRVModalArrayList.add(new CategoryRVModal("General","https://images.unsplash.com/photo-1509854120-eeab44807cd0?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1219&q=80"));
//
//        this methode will tell our adapter that our data has changed.
        categoryRVAdapter.notifyDataSetChanged();

    }


    private void getNews(String category){

        loadingPB.setVisibility(View.VISIBLE);

        String categoryURL = "https://newsapi.org/v2/top-headlines?country=in&category=" + category + "&apiKey=515c8455797e4eb5b942b094725804eb";
        String url = "https://newsapi.org/v2/top-headlines?country=in&excludeDomains=stackoverflow.com&sortBy=publishedAt&language=en&apiKey=515c8455797e4eb5b942b094725804eb";
        String BASE_URL ="https://newsapi.org/";

        Retrofit retrofit =new Retrofit.Builder().baseUrl(BASE_URL).addConverterFactory(GsonConverterFactory.create()).build();

        RetrofitAPI retrofitAPI =retrofit.create(RetrofitAPI.class);

        Call<NewsModal> call;

        if(category.equals("All")){
            call = retrofitAPI.getAllNews(url);
        }
        else{
            call = retrofitAPI.getNewsByCategory(categoryURL);
        }

        call.enqueue(new Callback<NewsModal>() {
            @Override
            public void onResponse(Call<NewsModal> call, Response<NewsModal> response) {
                NewsModal newsModal = response.body();
                loadingPB.setVisibility(View.GONE);
                ArrayList<Articles> articles= newsModal.getArticles();
                for(int i=0;i<articles.size();i++){
                    articlesArrayList.add(new Articles(articles.get(i).getTitle(), articles.get(i).getDescription()
                    ,  articles.get(i).getUrlToImage(), articles.get(i).getUrl(), articles.get(i).getContent()));
                }
                    newsRVAdapter.notifyDataSetChanged();
            }

            @Override
            public void onFailure(Call<NewsModal> call, Throwable t) {
                Toast.makeText(MainActivity.this,"Fail to get news Try Agian",Toast.LENGTH_SHORT).show();
            }
        });
    }


    @Override
    public void onCategoryClick(int position) {
        String category = categoryRVModalArrayList.get(position).getCategory();
        getNews(category);

    }
}


What I have tried:

This is code of MainActivity.java and i think something is wrong here ,i wants that when i click on  my category RecyclerView i should get news of that category. , that is if i click on science i should get science related news.
Posted
Comments
David Crow 5-Dec-22 13:13pm    
Does the onCategoryClick() method get called? If so, is the value of position correct?

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