java - 如何将多个提要添加到 RSS 提要 Android 应用程序中？

Question

我正在创建一个包含 RSS 提要的 Android 应用程序。目前，我已经对应用程序进行了编程，以从一个 xml 提要中获取数据并显示我想要的方式。但是，我不确定如何将多个 xml feed 添加到我的程序中。我希望该应用程序能够显示来自多个提要/链接的数据。我目前正在直接从网址提取我的单个提要。

我是 Java 编程和 Android Studio 的初学者，所以这可能就是我无法弄清楚这一点的原因!有人建议使用 txt 文件来保存所有提要链接，但我不确定如何编码。

如果您需要以下文件以外的文件，请告诉我。我想我已经包含了相关文件。

抱歉，我是个菜鸟，任何帮助将不胜感激!

ReadRSS.java:

package com.example.liutaurasmazonas.cslogintrying;

import android.app.ProgressDialog;
import android.content.Context;
import android.os.AsyncTask;
import android.provider.DocumentsContract;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

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

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import static android.R.attr.data;

/**
 * Created by Joe on 04/03/2017.
 */
public class ReadRss extends AsyncTask<Void,Void,Void>{
    ArrayList<FeedItem>feedItems;
    RecyclerView recyclerView;
    Context context;
    String address="https://www.bloomberg.com/feeds/podcasts/etf_report.xml";
    ProgressDialog progressDialog;
    URL url;
    public ReadRss(Context context, RecyclerView recyclerView){
        this.recyclerView=recyclerView;
        this.context=context;
        progressDialog=new ProgressDialog(context);
        progressDialog.setMessage("Loading...");
    }

    @Override
    protected void onPreExecute() {
        progressDialog.show();
        super.onPreExecute();
    }

    @Override
    protected void onPostExecute(Void aVoid) {

        super.onPostExecute(aVoid);
        progressDialog.dismiss();
        MyAdapter adapter=new MyAdapter(context,feedItems);
        recyclerView.setLayoutManager(new LinearLayoutManager(context));
        recyclerView.addItemDecoration(new VerticalSpace(50));
        recyclerView.setAdapter(adapter);
    }

    @Override
    protected Void doInBackground(Void... params) {
        ProcessXml(Getdata());
        return null;
    }

    private void ProcessXml(Document data) {
       if (data != null){
           feedItems=new ArrayList<>();
           Element root=data.getDocumentElement();
           Node channel=root.getChildNodes().item(0);
           NodeList items=channel.getChildNodes();
           for (int i=0;i<items.getLength();i++){
               Node currentchild=items.item(i);
               if (currentchild.getNodeName().equalsIgnoreCase("item")){
                   FeedItem item=new FeedItem();
                   NodeList itemchilds=currentchild.getChildNodes();
                   for (int j=0;j<itemchilds.getLength();j++){
                       Node current=itemchilds.item(j);
                       if (current.getNodeName().equalsIgnoreCase("title")){
                           item.setTitle(current.getTextContent());
                       }else if (current.getNodeName().equalsIgnoreCase("itunes:summary")){
                           item.setDescription(current.getTextContent());
                       }else if (current.getNodeName().equalsIgnoreCase("pubDate")){
                           item.setPubDate(current.getTextContent());
                       }else if (current.getNodeName().equalsIgnoreCase("link")){
                           item.setLink(current.getTextContent());
                       }

                   }
                   feedItems.add(item);
//                   Log.d("itemTitle", item.getTitle());
//                   Log.d("itemDescription", item.getTitle());
//                   Log.d("itemLink", item.getTitle());
//                   Log.d("itemPubDate", item.getTitle());
               }
           }
       }
    }

    public Document Getdata(){
        try {
            url=new URL(address);
            HttpURLConnection connection= (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("GET");
            InputStream inputStream=connection.getInputStream();
            DocumentBuilderFactory builderFactory=DocumentBuilderFactory.newInstance();
            DocumentBuilder builder=builderFactory.newDocumentBuilder();
            Document xmlDoc = builder.parse(inputStream);
            return xmlDoc;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
}

MyAdapter.java

package com.example.liutaurasmazonas.cslogintrying;

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

import com.daimajia.androidanimations.library.Techniques;
import com.daimajia.androidanimations.library.YoYo;

import org.w3c.dom.Text;

import java.util.ArrayList;

/**
 * Created by Joe on 05/03/2017.
 */

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder>{
    ArrayList<FeedItem>feedItems;
    Context context;
    public MyAdapter(Context context,ArrayList<FeedItem>feedItems){
        this.feedItems=feedItems;
        this.context=context;
    }
    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view= LayoutInflater.from(context).inflate(R.layout.custum_row_news_item,parent,false);
        MyViewHolder holder=new MyViewHolder(view);
        return holder;

    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {
        YoYo.with(Techniques.FadeIn).playOn(holder.cardView);
        final FeedItem current=feedItems.get(position);
        holder.Title.setText(current.getTitle());
        holder.Description.setText(current.getDescription());
        holder.Date.setText(current.getPubDate());
        holder.cardView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(context, NewsDetails.class);
                intent.putExtra("Link", current.getLink());
                context.startActivity(intent);
            }
        });

    }

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

    public class MyViewHolder extends RecyclerView.ViewHolder {
        TextView Title,Description,Date;
        CardView cardView;
        public MyViewHolder(View itemView) {
            super(itemView);
            Title= (TextView) itemView.findViewById(R.id.title_text);
            Description=(TextView) itemView.findViewById(R.id.description_text);
            Date=(TextView) itemView.findViewById(R.id.date_text);
            cardView= (CardView) itemView.findViewById(R.id.cardview);
        }
    }
}

Answer 1

您可以简单地将另一个 RecyclerView 添加到您想要显示多个 feed 的 XML 布局中，然后使用另一个 Asynctask 和 Adapter 从新 RecyclerView 上的不同 URL 加载 feed。

像这样，

public class ReadRssFromUrl extends AsyncTask<Void,Void,Void>{
ArrayList<FeedItem>feedItems;
RecyclerView recyclerView1;
Context context;
String address="aDifferentUrl.xml";
ProgressDialog progressDialog;
URL url;
public ReadRss(Context context, RecyclerView recyclerView1){
    this.recyclerView1=recyclerView1;
    this.context=context;
    progressDialog=new ProgressDialog(context);
    progressDialog.setMessage("Loading...");
}

因此，您传递给此构造函数的 RecyclerView 应该是新的。

希望这有帮助。