How to Create a News App in Android?

import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.webkit.WebView;

public class WebActivity extends AppCompatActivity {
    // setting the TAG for debugging purposes
    private static String TAG="WebActivity";

    // declaring the webview
    private WebView myWebView;

    // declaring the url string variable
    private String url;

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

        // assigning the views to id's
        myWebView = (WebView) findViewById(R.id.webview);

        Intent intent = getIntent();

        // checking if there is an intent
        if(intent!=null){
            // retrieving the url in the intent
            url = intent.getStringExtra("url_key");

            // loading and displaying a
            // web page in the activity
            myWebView.loadUrl(url);
        }

    }

    @Override
    protected void onRestart() {
        super.onRestart();
        finish();
    }
}

public class NewsArticle {
  
    // the properties/attributes
    // of the ArticleModel
    String author;
    String title;
    String description;
    String url;
    String urlToImage;
    String publishedAt;
    String content;

    // ArticleModel empty constructor
    public NewsArticle() {
    }

    // get method : returns the name of the author
    public String getAuthor() {
        return author;
    }

    // set method : sets the author
    public void setAuthor(String author) {
        this.author = author;
    }

    // get method : returns the title of the article
    public String getTitle() {
        return title;
    }

    // set method : sets the title
    public void setTitle(String title) {
        this.title = title;
    }

    // get method : returns the description of the article
    public String getDescription() {
        return description;
    }

    // set method : sets the description
    public void setDescription(String description) {
        this.description = description;
    }

    // get method : returns url of the article
    public String getUrl() {
        return url;
    }

    // set method : sets the url of the article
    public void setUrl(String url) {
        this.url = url;
    }

    // get method : returns the urlToImage of the article
    public String getUrlToImage() {
        return urlToImage;
    }

    // set method : sets the UrlToImage
    public void setUrlToImage(String urlToImage) {
        this.urlToImage = urlToImage;
    }

    // get method : returns the date
    public String getPublishedAt() {
        return publishedAt;
    }

    // set method : sets the date
    public void setPublishedAt(String publishedAt) {
        this.publishedAt = publishedAt;
    }

    // get method : returns the content of the article
    public String getContent() {
        return content;
    }

    // set method : sets the title
    public void setContent(String content) {
        this.content = content;
    }
}

import android.content.Context;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.androidnetworking.widget.ANImageView;
import java.util.ArrayList;

public class ArticleAdapter extends RecyclerView.Adapter<ArticleAdapter.ViewHolder> {
    // setting the TAG for debugging purposes
    private static String TAG="ArticleAdapter";

    private ArrayList<NewsArticle> mArrayList;
    private Context mContext;

    public ArticleAdapter(Context context,ArrayList<NewsArticle> list){
        // initializing the constructor
        this.mContext=context;
        this.mArrayList=list;
    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        // inflating the layout with the article view  (R.layout.article_item)
        View view=LayoutInflater.from(mContext).inflate(R.layout.article_item,parent,false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        // the parameter position is the index of the current article
        // getting the current article from the ArrayList using the position
        NewsArticle currentArticle=mArrayList.get(position);

        // setting the text of textViews
        holder.title.setText(currentArticle.getTitle());
        holder.description.setText(currentArticle.getDescription());

        // subString(0,10) trims the date to make it short
        holder.contributordate.setText(currentArticle.getAuthor()+
                " | "+currentArticle.getPublishedAt().substring(0,10));

        // Loading image from network into  
        // Fast Android Networking View ANImageView
        holder.image.setDefaultImageResId(R.drawable.ic_launcher_background);
        holder.image.setErrorImageResId(R.drawable.ic_launcher_foreground);
        holder.image.setImageUrl(currentArticle.getUrlToImage());

        // setting the content Description on the Image
        holder.image.setContentDescription(currentArticle.getContent());

        // handling click event of the article
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // an intent to the WebActivity that display web pages
                Intent intent = new Intent(mContext, WebActivity.class);
                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                intent.putExtra("url_key",currentArticle.getUrl());

                // starting an Activity to display the page of the article
                mContext.startActivity(intent);
            }
        });

    }

    @Override
    public int getItemCount() {
        return mArrayList.size();
    }

    public class ViewHolder extends RecyclerView.ViewHolder{

        // declaring the views
        private TextView title,description,contributordate;
        private ANImageView image;

        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            // assigning views to their ids
            title=itemView.findViewById(R.id.title_id);
            description=itemView.findViewById(R.id.description_id);
            image=itemView.findViewById(R.id.image_id);
            contributordate=itemView.findViewById(R.id.contributordate_id);
        }
    }

}

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ProgressBar;
import com.androidnetworking.AndroidNetworking;
import com.androidnetworking.common.Priority;
import com.androidnetworking.error.ANError;
import com.androidnetworking.interfaces.JSONObjectRequestListener;
import com.jacksonandroidnetworking.JacksonParserFactory;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
   
    // TODO : set the API_KEY variable to your api key
    private static  String API_KEY="";

    // setting the TAG for debugging purposes
    private static String TAG="MainActivity";

    // declaring the views
    private ProgressBar mProgressBar;
    private RecyclerView mRecyclerView;

    // declaring an ArrayList of articles
    private ArrayList<NewsArticle> mArticleList;

    private ArticleAdapter mArticleAdapter;

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

        // initializing the Fast Android Networking Library
        AndroidNetworking.initialize(getApplicationContext());

        // setting the JacksonParserFactory
        AndroidNetworking.setParserFactory(new JacksonParserFactory());

        // assigning views to their ids
        mProgressBar=(ProgressBar)findViewById(R.id.progressbar_id);
        mRecyclerView=(RecyclerView)findViewById(R.id.recyclerview_id);

        // setting the recyclerview layout manager
        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));

        // initializing the ArrayList of articles
        mArticleList=new ArrayList<>();

        // calling get_news_from_api()
        get_news_from_api();
    }

    public void get_news_from_api(){
        // clearing the articles list before adding news ones
        mArticleList.clear();

        // Making a GET Request using Fast
        // Android Networking Library
        // the request returns a JSONObject containing 
        // news articles from the news api
        // or it will return an error
        AndroidNetworking.get("https://newsapi.org/v2/top-headlines")
                .addQueryParameter("country", "in")
                .addQueryParameter("apiKey",API_KEY)
                .addHeaders("token", "1234")
                .setTag("test")
                .setPriority(Priority.LOW)
                .build()
                .getAsJSONObject(new JSONObjectRequestListener(){
                    @Override
                    public void onResponse(JSONObject response) {
                        // disabling the progress bar
                        mProgressBar.setVisibility(View.GONE);

                        // handling the response
                        try {

                            // storing the response in a JSONArray
                            JSONArray articles=response.getJSONArray("articles");

                            // looping through all the articles
                            // to access them individually
                            for (int j=0;j<articles.length();j++)
                            {
                                // accessing each article object in the JSONArray
                                JSONObject article=articles.getJSONObject(j);

                                // initializing an empty ArticleModel
                                NewsArticle currentArticle=new NewsArticle();

                                // storing values of the article object properties
                                String author=article.getString("author");
                                String title=article.getString("title");
                                String description=article.getString("description");
                                String url=article.getString("url");
                                String urlToImage=article.getString("urlToImage");
                                String publishedAt=article.getString("publishedAt");
                                String content=article.getString("content");

                                // setting the values of the ArticleModel
                                // using the set methods
                                currentArticle.setAuthor(author);
                                currentArticle.setTitle(title);
                                currentArticle.setDescription(description);
                                currentArticle.setUrl(url);
                                currentArticle.setUrlToImage(urlToImage);
                                currentArticle.setPublishedAt(publishedAt);
                                currentArticle.setContent(content);

                                // adding an article to the articles List
                                mArticleList.add(currentArticle);
                            }

                            // setting the adapter
                            mArticleAdapter=new ArticleAdapter(getApplicationContext(),mArticleList);
                            mRecyclerView.setAdapter(mArticleAdapter);

                        } catch (JSONException e) {
                            e.printStackTrace();
                            // logging the JSONException LogCat
                            Log.d(TAG,"Error : "+e.getMessage());
                        }

                    }
                    @Override
                    public void onError(ANError error) {
                        // logging the error detail and response to LogCat
                        Log.d(TAG,"Error detail : "+error.getErrorDetail());
                        Log.d(TAG,"Error response : "+error.getResponse());
                    }
                });
    }
}