Android: Noticias App, Realm

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="tech.alvarez.noticias.MainActivity">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</RelativeLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="tech.alvarez.noticias">

    <uses-permission android:name="android.permission.INTERNET" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

build.gradle

// del módulo
apply plugin: 'com.android.application'

android {
    compileSdkVersion 24
    buildToolsVersion "24.0.0"

    defaultConfig {
        applicationId "tech.alvarez.noticias"
        minSdkVersion 15
        targetSdkVersion 24
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:24.0.0'
    compile 'com.android.support:design:24.0.0'
    compile 'com.android.support:cardview-v7:24.0.0'
    compile 'com.android.support:recyclerview-v7:24.0.0'

    compile 'com.github.bumptech.glide:glide:3.7.0'
}

colors.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="colorPrimary">#3F51B5</color>
    <color name="colorPrimaryDark">#303F9F</color>
    <color name="colorAccent">#FF4081</color>

    <color name="colorPrimaryText">#DE000000</color>
    <color name="colorSecondaryText">#8A000000</color>
    <color name="colorDisabledText">#61000000</color>

    <color name="colorPrimaryDarkText">#FFFFFF</color>
    <color name="colorSecondaryDarkText">#B3FFFFFF</color>
    <color name="colorDisabledDarkText">#80FFFFFF</color>
</resources>

item_noticia.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginBottom="0dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginTop="8dp"
    android:orientation="horizontal"
    android:paddingBottom="16dp"
    card_view:cardCornerRadius="2dp">


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:orientation="vertical">

        <ImageView
            android:id="@+id/fotoImageView"
            android:layout_width="match_parent"
            android:layout_height="168dp"
            android:background="@color/colorAccent" />

        <TextView
            android:id="@+id/tituloTextView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:paddingEnd="16dp"
            android:paddingStart="16dp"
            android:paddingTop="24dp"
            android:text="@string/app_name"
            android:textColor="@color/colorPrimaryText"
            android:textSize="24sp" />

        <TextView
            android:id="@+id/descripcionTextView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:paddingBottom="16dp"
            android:paddingEnd="16dp"
            android:paddingStart="16dp"
            android:paddingTop="4dp"
            android:text="@string/app_name"
            android:textColor="@color/colorSecondaryText"
            android:textSize="14sp" />

    </LinearLayout>

</android.support.v7.widget.CardView>

LaRazonParserXML.java

package tech.alvarez.noticias.utils;

import android.sax.Element;
import android.sax.EndElementListener;
import android.sax.EndTextElementListener;
import android.sax.RootElement;
import android.sax.StartElementListener;
import android.util.Xml;

import org.xml.sax.Attributes;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;

import tech.alvarez.noticias.models.Noticia;

/**
 * Created by Daniel Alvarez on 15/7/16.
 * Copyright © 2016 Alvarez.tech. All rights reserved.
 */
public class LaRazonParserXML {
    private URL url;
    private Noticia noticiaActual;

    public LaRazonParserXML(String url) {
        try {
            this.url = new URL(url);
        } catch (MalformedURLException e) {
            throw new RuntimeException(e);
        }
    }

    public ArrayList<Noticia> parse() {

        final ArrayList<Noticia> noticias = new ArrayList<Noticia>();

        RootElement root = new RootElement("rss");
        Element channel = root.getChild("channel");
        Element item = channel.getChild("item");

        item.setStartElementListener(new StartElementListener() {
            @Override
            public void start(Attributes attributes) {
                noticiaActual = new Noticia();
            }
        });


        item.getChild("title").setEndTextElementListener(new EndTextElementListener() {
            @Override
            public void end(String s) {
                noticiaActual.setTitulo(s);
            }
        });

        item.getChild("description").setEndTextElementListener(new EndTextElementListener() {
            @Override
            public void end(String s) {
                noticiaActual.setDescripcion(s);
            }
        });

        item.getChild("link").setEndTextElementListener(new EndTextElementListener() {
            @Override
            public void end(String s) {
                noticiaActual.setUrlNoticia(s);
            }
        });

        item.getChild("enclosure").setStartElementListener(new StartElementListener() {
            @Override
            public void start(Attributes attributes) {
                String urlFoto = attributes.getValue("url");
                noticiaActual.setUrlFoto(urlFoto);
            }
        });


        item.setEndElementListener(new EndElementListener() {
            @Override
            public void end() {
                noticias.add(noticiaActual);
            }
        });

        try {
            Xml.parse(getInputStream(), Xml.Encoding.UTF_8, root.getContentHandler());
        } catch (Exception ex) {
            throw new RuntimeException(ex);
        }

        return noticias;
    }


    private InputStream getInputStream() {
        try {
            return url.openConnection().getInputStream();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

}

MainActivity.java

package tech.alvarez.noticias;

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

import java.util.ArrayList;

import tech.alvarez.noticias.adapters.NoticiasAdapter;
import tech.alvarez.noticias.models.Noticia;
import tech.alvarez.noticias.utils.LaRazonParserXML;

public class MainActivity extends AppCompatActivity {

    private RecyclerView recyclerView;
    private NoticiasAdapter noticiasAdapter;

    private ArrayList<Noticia> noticias;


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


        recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));

        noticiasAdapter = new NoticiasAdapter(this);
        recyclerView.setAdapter(noticiasAdapter);

        ObtenerLaRazonXML tarea = new ObtenerLaRazonXML();
        tarea.execute("http://www.la-razon.com/rss/nacional/");
    }

    public class ObtenerLaRazonXML extends AsyncTask<String, Void, Boolean> {

        @Override
        protected Boolean doInBackground(String... strings) {

            String url = strings[0];

            LaRazonParserXML parserXML = new LaRazonParserXML(url);
            noticias = parserXML.parse();


            return null;
        }

        @Override
        protected void onPostExecute(Boolean aBoolean) {
            super.onPostExecute(aBoolean);

            for (int i = 0; i < noticias.size(); i++) {
                Noticia n = noticias.get(i);

                noticiasAdapter.adicionar(n);


                Log.i("MIAPP", n.getTitulo());
                Log.i("MIAPP", n.getDescripcion());
                Log.i("MIAPP", n.getUrlFoto());
                Log.i("MIAPP", n.getUrlNoticia());


            }
        }
    }


}

Noticia.java

package tech.alvarez.noticias.models;

/**
 * Created by Daniel Alvarez on 15/7/16.
 * Copyright © 2016 Alvarez.tech. All rights reserved.
 */
public class Noticia {

    private String titulo;
    private String descripcion;
    private String urlFoto;
    private String urlNoticia;

    public String getTitulo() {
        return titulo;
    }

    public void setTitulo(String titulo) {
        this.titulo = titulo;
    }

    public String getDescripcion() {
        return descripcion;
    }

    public void setDescripcion(String descripcion) {
        this.descripcion = descripcion;
    }

    public String getUrlFoto() {
        return urlFoto;
    }

    public void setUrlFoto(String urlFoto) {
        this.urlFoto = urlFoto;
    }

    public String getUrlNoticia() {
        return urlNoticia;
    }

    public void setUrlNoticia(String urlNoticia) {
        this.urlNoticia = urlNoticia;
    }
}

NoticiasAdapter.java

package tech.alvarez.noticias.adapters;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import com.bumptech.glide.Glide;
import com.bumptech.glide.load.engine.DiskCacheStrategy;

import java.util.ArrayList;

import tech.alvarez.noticias.R;
import tech.alvarez.noticias.models.Noticia;

/**
 * Created by Daniel Alvarez on 15/7/16.
 * Copyright © 2016 Alvarez.tech. All rights reserved.
 */
public class NoticiasAdapter extends RecyclerView.Adapter<NoticiasAdapter.ViewHolder> {

    private ArrayList<Noticia> dataset;
    private Context context;

    public NoticiasAdapter(Context context) {
        this.dataset = new ArrayList<>();
        this.context = context;
    }

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

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        Noticia n = dataset.get(position);
        holder.tituloTextView.setText(n.getTitulo());
        holder.descripcionTextView.setText(n.getDescripcion());

        Glide.with(context).load(n.getUrlFoto())
                .centerCrop()
                .crossFade()
                .diskCacheStrategy(DiskCacheStrategy.ALL)
                .into(holder.fotoImageView);
    }

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


    public static class ViewHolder extends RecyclerView.ViewHolder {

        private TextView tituloTextView;
        private TextView descripcionTextView;
        private ImageView fotoImageView;

        public ViewHolder(View itemView) {
            super(itemView);

            tituloTextView = (TextView) itemView.findViewById(R.id.tituloTextView);
            descripcionTextView = (TextView) itemView.findViewById(R.id.descripcionTextView);
            fotoImageView = (ImageView) itemView.findViewById(R.id.fotoImageView);
        }
    }

    public void adicionar(Noticia n) {
        dataset.add(n);
        notifyDataSetChanged();
    }
}