package com.pingyijinren.test;

import android.util.Log;

import org.xml.sax.Attributes;

import org.xml.sax.SAXException;

import org.xml.sax.helpers.DefaultHandler;

/**

 * Created by Administrator on 2016/5/19 0019.

 */

public class ContentHandler extends DefaultHandler {

    private String nodeName;

    private StringBuilder id;

    private StringBuilder name;

    private StringBuilder version;

    @Override

    public void startDocument() throws SAXException{

        id=new StringBuilder();

        name=new StringBuilder();

        version=new StringBuilder();

    }

    @Override

    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException{

        nodeName=localName;

    }

    @Override

    public void characters(char[] ch,int start,int length) throws SAXException{

        if(nodeName.equals("id")){

            id.append(ch,start,length);

        }

        else if(nodeName.equals("name")){

            name.append(ch,start,length);

        }

        else if(nodeName.equals("version")){

            version.append(ch,start,length);

        }

    }

    @Override

    public void endElement(String uri,String localName,String qName) throws SAXException{

        if(localName.equals("app")){

            Log.d("MainActivity","id is "+id.toString().trim());

            Log.d("MainActivity","name is "+name.toString().trim());

            Log.d("MainActivity","version is "+version.toString().trim());

            id.setLength(0);

            name.setLength(0);

            version.setLength(0);

        }

    }

    @Override

    public void endDocument() throws SAXException{}

}

package com.pingyijinren.test;

import android.content.Intent;

import android.os.Handler;

import android.os.Message;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.widget.Button;

import android.widget.TextView;

import org.apache.http.HttpEntity;

import org.apache.http.HttpResponse;

import org.apache.http.client.HttpClient;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.http.util.EntityUtils;

import org.xml.sax.InputSource;

import org.xml.sax.XMLReader;

import org.xmlpull.v1.XmlPullParser;

import org.xmlpull.v1.XmlPullParserFactory;

import java.io.BufferedReader;

import java.io.EOFException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.StringReader;

import java.net.HttpURLConnection;

import java.net.URL;

import javax.xml.parsers.SAXParserFactory;

public class MainActivity extends AppCompatActivity{

    private Button button;

    private TextView textView;

    private static final int SHOW_RESPONSE=0;

    private Handler handler=new Handler(){

        public void handleMessage(Message message){

            switch(message.what){

                case SHOW_RESPONSE:

                    String response=(String)message.obj;

                    textView.setText(response);

            }

        }

    };

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        button=(Button)findViewById(R.id.button);

        textView=(TextView)findViewById(R.id.textView);

        button.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                sendRequestWithHttpURLConnection();

            }

        });

    }

    private void sendRequestWithHttpURLConnection(){

        new Thread(new Runnable(){

            @Override

            public void run(){

                try{

                    HttpClient httpClient = new DefaultHttpClient();

                    HttpGet httpGet=new HttpGet("http://172.29.209.1/get_data.xml");

                    HttpResponse httpResponse=httpClient.execute(httpGet);

                    if(httpResponse.getStatusLine().getStatusCode()==200){

                        HttpEntity httpEntity=httpResponse.getEntity();

                        String response= EntityUtils.toString(httpEntity,"utf-8");

                        Log.d("MainActivity",response);

                        parseXMLWithSAX(response);

                    }

                }

                catch(Exception e){

                    e.printStackTrace();

                }

            }

        }).start();

    }

    private void parseXMLWithSAX(String xmlData){

        try{

            SAXParserFactory factory=SAXParserFactory.newInstance();

            XMLReader xmlReader=factory.newSAXParser().getXMLReader();

            ContentHandler handler=new ContentHandler();

            xmlReader.setContentHandler(handler);

            xmlReader.parse(new InputSource(new StringReader(xmlData)));

        }

        catch(Exception e){

            e.printStackTrace();

        }

    }

}