Build a rss news reader with image android sample

Here is a sample Android app that builds a basic RSS news reader with image support:

Project Structure

app folder: contains the Android app code
res folder: contains the app's resources (e.g. layouts, images, strings)
src folder: contains the app's Java code
build.gradle file: contains the app's build configuration

app/build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 29
    buildToolsVersion '29.0.3'

    defaultConfig {
        applicationId "com.example.rssreader"
        minSdkVersion 21
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-project.txt'
        }
    }
}

dependencies {
    implementation 'androidx.appcompat:appcompat:1.2.0'
    implementation 'androidx.recyclerview:recyclerview:1.2.0'
    implementation 'androidx.cardview:cardview:1.0.0'
    implementation 'com.squareup.picasso:picasso:2.71828'
    implementation 'org.simpleframework:simple-xml:2.7.1'
}

app/src/main/java/com/example/rssreader

MainActivity.java: the main activity that displays the RSS feed
RssFeedAdapter.java: an adapter that binds the RSS feed data to a RecyclerView
RssFeedItem.java: a data model that represents a single RSS feed item
RssParser.java: a parser that parses the RSS feed XML and returns a list of RssFeedItem objects

app/src/main/res/layout

activity_main.xml: the layout for the main activity
item_layout.xml: the layout for a single RSS feed item

app/src/main/res/values

strings.xml: the app's string resources

MainActivity.java

import android.os.Bundle;
import android.widget.Toast;

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

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
    private RecyclerView recyclerView;
    private RssFeedAdapter adapter;
    private List<RssFeedItem> rssFeedItems;

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

        recyclerView = findViewById(R.id.recycler_view);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));

        rssFeedItems = new ArrayList<>();
        adapter = new RssFeedAdapter(rssFeedItems);
        recyclerView.setAdapter(adapter);

        new RssParser().parseRssFeed("https://example.com/rss", new RssParser.OnRssFeedParsedListener() {
            @Override
            public void onRssFeedParsed(List<RssFeedItem> rssFeedItems) {
                MainActivity.this.rssFeedItems.clear();
                MainActivity.this.rssFeedItems.addAll(rssFeedItems);
                adapter.notifyDataSetChanged();
            }
        });
    }
}

RssFeedAdapter.java

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.recyclerview.widget.RecyclerView;

import java.util.List;

public class RssFeedAdapter extends RecyclerView.Adapter<RssFeedAdapter.ViewHolder> {
    private List<RssFeedItem> rssFeedItems;

    public RssFeedAdapter(List<RssFeedItem> rssFeedItems) {
        this.rssFeedItems = rssFeedItems;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_layout, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        RssFeedItem rssFeedItem = rssFeedItems.get(position);
        holder.titleTextView.setText(rssFeedItem.getTitle());
        holder.descriptionTextView.setText(rssFeedItem.getDescription());
        Picasso.get().load(rssFeedItem.getImageUrl()).into(holder.imageView);
    }

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

    public class ViewHolder extends RecyclerView.ViewHolder {
        public TextView titleTextView;
        public TextView descriptionTextView;
        public ImageView imageView;

        public ViewHolder(View itemView) {
            super(itemView);
            titleTextView = itemView.findViewById(R.id.title_text_view);
            descriptionTextView = itemView.findViewById(R.id.description_text_view);
            imageView = itemView.findViewById(R.id.image_view);
        }
    }
}

RssFeedItem.java

import java.util.Date;

public class RssFeedItem {
    private String title;
    private String description;
    private String imageUrl;

    public RssFeedItem(String title, String description, String imageUrl) {
        this.title = title;
        this.description = description;
        this.imageUrl = imageUrl;
    }

    public String getTitle() {
        return title;
    }

    public String getDescription() {
        return description;
    }

    public String getImageUrl() {
        return imageUrl;
    }
}

RssParser.java

import org.simpleframework.xml.Element;
import org.simpleframework.xml.ElementList;
import org.simpleframework.xml.Root;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

@Root(name = "rss", strict = false)
public class RssParser {
    private OnRssFeedParsedListener onRssFeedParsedListener;

    public RssParser() {}

    public void parseRssFeed(String url, OnRssFeedParsedListener onRssFeedParsedListener) {
        this.onRssFeedParsedListener = onRssFeedParsedListener;
        new DownloadRssFeedTask().execute(url);
    }

    public interface OnRssFeedParsedListener {
        void onRssFeedParsed(List<RssFeedItem> rssFeedItems);
    }

    private class DownloadRssFeedTask extends AsyncTask<String, Void, String> {
        @Override
        protected String doInBackground(String... urls) {
            try {
                InputStream inputStream = new URL(urls[0]).openStream();
                String rssFeedXml = convertInputStreamToString(inputStream);
                return rssFeedXml;
            } catch (Exception e) {
                return null;
            }
        }

        @Override
        protected void onPostExecute(String rssFeedXml) {
            if (rssFeedXml!= null) {
                List<RssFeedItem> rssFeedItems = parseRssFeedXml(rssFeedXml);
                onRssFeedParsedListener.onRssFeedParsed(rssFeedItems);
            }
        }
    }

    private String convertInputStreamToString(InputStream inputStream) {
        // Convert the input stream to a string
        //...
    }

    private List<RssFeedItem> parseRssFeedXml(String rssFeedXml) {
        // Parse the RSS feed XML and return a list of RssFeedItem objects
        //...
    }
}

item_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <TextView
        android:id="@+id/title_text_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="16sp"
        android:textStyle="bold" />

    <TextView
        android:id="@+id/description_text_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="14sp" />

    <ImageView
        android:id="@+id/image_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:scaleType="centerCrop" />

</LinearLayout>

This is a basic example of an RSS news reader with image support. You'll need to modify the RssParser class to parse the RSS feed XML and return a list of RssFeedItem objects. You'll also need to modify the MainActivity class to display the RSS feed items in a RecyclerView.

Note that this is just a sample code and you'll need to modify it to fit your specific requirements. Additionally, you'll need to add error handling and other features to make the app more robust.

NewsBreakers

Build a rss news reader with image android sample