Pull方式解析XML文件

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.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;

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);

                        parseXMLWithPull(response);
                    }
                }
                catch(Exception e){
                    e.printStackTrace();
                }

            }
        }).start();
    }

    private void parseXMLWithPull(String xmlData){
        try{
            XmlPullParserFactory factory=XmlPullParserFactory.newInstance();
            XmlPullParser xmlPullParser=factory.newPullParser();
            xmlPullParser.setInput(new StringReader(xmlData));
            int eventType=xmlPullParser.getEventType();

            String id="";
            String name="";
            String version="";

            while(eventType!=xmlPullParser.END_DOCUMENT){
                String nodeName=xmlPullParser.getName();

                switch(eventType){
                    case XmlPullParser.START_TAG:{
                        if(nodeName.equals("id")){
                            id=xmlPullParser.nextText();
                        }
                        else if(nodeName.equals("name")){
                            name=xmlPullParser.nextText();
                        }
                        else if(nodeName.equals("version")){
                            version=xmlPullParser.nextText();
                        }
                        break;
                    }

                    case XmlPullParser.END_TAG:{
                        if(nodeName.equals("app")){
                            Log.d("MainActivity ","id"+id);
                            Log.d("MainActivity","name"+name);
                            Log.d("MainActivity","version"+version);
                        }
                    }
                    break;

                    default:
                        break;
                }
                eventType=xmlPullParser.next();
            }

        }
        catch(Exception e){
            e.printStackTrace();
        }
    }
}