具有多个根元素的 Android XmlPullParser

Question

我来自 c# 背景，是 android 新手。我正在尝试解析从 .NET 生成的 XML 文件。它实际上是一个包含多个表的 XMLDataSet。如下图

<XMLDataSet xmlns="http://tempuri.org/XMLDataSet.xsd">
    <table1>
        <row1>value</row1>
        <row2>value</row2>
        <row3>value</row3>
    </table1>
    <table1>
        <row1>value</row1>
        <row2>value</row2>
        <row3>value</row3>
    </table1>
    <table2>
        <row1>value</row1>
        <row2>value</row2>
        <row3>value</row3>
    </table2>
    <table2>
        <row1>value</row1>
        <row2>value</row2>
        <row3>value</row3>
    </table2>
</XMLDataSet>

等等。 我想解析这个 xml 并获取“列表”。在 c# 中，我使用 XMLDataSet 和 xmlDataSet.Tables["table1"] 来解析它并获取一个列表。 但是我无法使用 XmlPullParser 在 Android 中解析具有多个根元素的 XML。我遇到的所有示例都显示了如何解析单个根 XML。有人可以帮助我解析具有多个根的 XML 文件吗？

Answer 1

试试这个..

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.annotation.TargetApi;
import android.app.Activity;
import android.app.ProgressDialog;
import android.view.Menu;

public class NetActivity extends Activity {

    String urls = "Your URL";

    // Progress dialog
    ProgressDialog pDialog;


    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_net);

         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB)
             new XmlParsing(urls).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, new String[]{null});
         else
             new XmlParsing(urls).execute(new String[]{null});


    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    public class XmlParsing extends AsyncTask<String, Void, String> {

        // variables passed in:
        String urls;
        //  constructor
        public XmlParsing(String urls) {
            this.urls = urls;
        }

        @Override
        protected void onPreExecute() {
            pDialog = ProgressDialog.show(NetActivity.this, "Fetching Details..", "Please wait...", true);
        }


        @Override
        protected String doInBackground(String... params) {
            // TODO Auto-generated method stub

            URL url;
            try {

                url = new URL(urls);
                DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
                DocumentBuilder db = dbf.newDocumentBuilder();
                Document doc = db.parse(new InputSource(url.openStream()));

                doc.getDocumentElement().normalize();

                NodeList nodeList = doc.getElementsByTagName("table1");

                for (int i = 0; i < nodeList.getLength(); i++) {

                    Node node = nodeList.item(i);       

                    Element fstElmnt = (Element) node;
                    NodeList nameList = fstElmnt.getElementsByTagName("row1");
                    Element nameElement = (Element) nameList.item(0);
                    nameList = nameElement.getChildNodes();

                    System.out.println("row1 : "+(((Node) nameList.item(0)).getNodeValue()));

                }

                NodeList nodeList1 = doc.getElementsByTagName("table2");

                for (int i = 0; i < nodeList1.getLength(); i++) {

                    Node node = nodeList1.item(i);      

                    Element fstElmnt = (Element) node;
                    NodeList nameList = fstElmnt.getElementsByTagName("row1");
                    Element nameElement = (Element) nameList.item(0);
                    nameList = nameElement.getChildNodes();

                    System.out.println("row1 : "+(((Node) nameList.item(0)).getNodeValue()));

                }

            } catch (MalformedURLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (ParserConfigurationException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (SAXException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }


            return null;
        }

        @Override
        protected void onPostExecute(String result) {
            // Now we have your JSONObject, play around with it.
            if (pDialog.isShowing())
                pDialog.dismiss();


        }

    }

}