package de.metalmatze.krautreporter.activities;

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;

import java.util.ArrayList;

import de.metalmatze.krautreporter.R;
import de.metalmatze.krautreporter.adapters.ArticleRecyclerViewAdapter;
import de.metalmatze.krautreporter.entities.Article;

public class MainActivity extends ActionBarActivity {

    private RecyclerView recyclerView;

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

        this.recyclerView = (RecyclerView) findViewById(R.id.recyclerView);

        LinearLayoutManager layoutManager = new LinearLayoutManager(this);
        layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
        layoutManager.scrollToPosition(0);
        recyclerView.setLayoutManager(layoutManager);

        ArrayList<Article> articles = new ArrayList<Article>();
        ArticleRecyclerViewAdapter adapter = new ArticleRecyclerViewAdapter(articles);

        for (int i = 1; i <= 150; i++) {
            articles.add(new Article(i + ".10.2014", "Artikel Nummer " + i));
        }

        recyclerView.setAdapter(adapter);
    }

}

package de.metalmatze.krautreporter.activities;

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

import org.xmlpull.v1.XmlPullParserException;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.util.ArrayList;

import de.metalmatze.krautreporter.KrautreporterRssParser;
import de.metalmatze.krautreporter.R;
import de.metalmatze.krautreporter.adapters.ArticleRecyclerViewAdapter;
import de.metalmatze.krautreporter.entities.Article;

public class MainActivity extends ActionBarActivity {

    protected RecyclerView recyclerView;
    protected ArticleRecyclerViewAdapter recyclerViewAdapter;

    private ArrayList<Article> articles;

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

        this.recyclerView = (RecyclerView) findViewById(R.id.recyclerView);

        LinearLayoutManager layoutManager = new LinearLayoutManager(this);
        layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
        layoutManager.scrollToPosition(0);
        this.recyclerView.setLayoutManager(layoutManager);

        BufferedInputStream inputStream = null;
        try {

                inputStream = new BufferedInputStream(getAssets().open("krautreporter.rss"));
                this.articles = new KrautreporterRssParser().parse(inputStream);

            } catch (IOException e) {
                e.printStackTrace();
            } catch (XmlPullParserException e) {
                e.printStackTrace();
            }

        Log.d("An article", this.articles.get(0).toString());

        this.recyclerViewAdapter = new ArticleRecyclerViewAdapter(this.articles);
        this.recyclerView.setAdapter(this.recyclerViewAdapter);

    }

}

Use KrautreporterRssParser in MainActivity@onCreate()