Android学习之XML Pull 解析

MyXMLPullUtil.java:

package com.cz.xmlpull;

import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserFactory;
import org.xmlpull.v1.XmlSerializer;

public class MyXMLPullUtil {

  private List<LinkMan> all = null;
  private OutputStream output = null;

  private InputStream input = null;

  public MyXMLPullUtil(OutputStream output, List<LinkMan> all) {
    this.output = output;
    this.all = all;
  }

  public MyXMLPullUtil(InputStream input) {
    this.input = input;
  }

  public void writeByXMLPull() throws Exception {
    XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
    XmlSerializer xs = factory.newSerializer();
    xs.setOutput(this.output, "UTF-8");
    xs.startDocument("UTF-8", true);
    xs.startTag(null, "addresslist");// 根元素
    Iterator<LinkMan> iter = this.all.iterator();
    while (iter.hasNext()) {
      LinkMan man = iter.next();
      xs.startTag(null, "linkman");
      xs.startTag(null, "name");
      xs.text(man.getName());
      xs.endTag(null, "name");
      xs.startTag(null, "email");
      xs.text(man.getEmail());
      xs.endTag(null, "email");
      xs.endTag(null, "linkman");
    }
    xs.endTag(null, "addresslist");
    xs.endDocument();
    xs.flush();
  }

  public List<LinkMan> readByXMLPull() throws Exception {
    List<LinkMan> all = null;
    LinkMan man = null;
    String elementName = null; // 保存节点的名称
    XmlPullParserFactory factory = XmlPullParserFactory.newInstance();// 取得XmlPullParserFactory类对象
    XmlPullParser xmlPullParser = factory.newPullParser();// 取得XmlPullParser接口对象
    xmlPullParser.setInput(this.input, "UTF-8");
    int eventType = xmlPullParser.getEventType(); // 取得事件码
    while (eventType != XmlPullParser.END_DOCUMENT) { // 不是文档底部
      if (eventType == XmlPullParser.START_DOCUMENT) { // 文档开始
        all = new ArrayList<LinkMan>();
      } else if (eventType == XmlPullParser.START_TAG) { // 元素标记开始
        elementName = xmlPullParser.getName(); // 取得元素的名称
        if ("linkman".equals(elementName)) {
          man = new LinkMan();
        }
      } else if (eventType == XmlPullParser.END_TAG) { // 结束元素
        elementName = xmlPullParser.getName(); // 取得节点名称
        if ("linkman".equals(elementName)) {
          all.add(man);
          man = null;
        }
      } else if (eventType == XmlPullParser.TEXT) { // 数据
        if ("name".equals(elementName)) {
          man.setName(xmlPullParser.getText());
        } else if ("email".equals(elementName)) {
          man.setEmail(xmlPullParser.getText());
        }
      }
      eventType = xmlPullParser.next(); // 取得下一个事件码
    }
    return all;
  }
}

 

 

 

XMLPullActivity.java:

package com.cz.xmlpull;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

import com.cz.test.R;

public class XMLPullActivity extends Activity {

  private TextView name = null;
  private TextView email = null;
  private Button but_read = null;

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.haha);
    
    writeByXMLPull();
    
    readByXMLPull();

  }

  private void writeByXMLPull() {
    if (!Environment.getExternalStorageState().equals(
        Environment.MEDIA_MOUNTED)) { // 不存在不操作
      return; // 返回到程序的被调用处
    }
    File file = new File(Environment.getExternalStorageDirectory()
        + File.separator + "haha" + File.separator + "test.xml"); // 要输出文件的路径
    if (!file.getParentFile().exists()) { // 文件不存在
      file.getParentFile().mkdirs(); // 创建文件夹
    }
    List<LinkMan> all = new ArrayList<LinkMan>();
    for (int x = 0; x < 3; x++) {
      LinkMan man = new LinkMan();
      man.setName("haha - " + x);
      man.setEmail("[e-mail]");
      all.add(man);
    }
    OutputStream output = null;
    try {
      output = new FileOutputStream(file);
      new MyXMLPullUtil(output, all).writeByXMLPull();
    } catch (Exception e) {
    } finally {
      if (output != null) {
        try {
          output.close();
        } catch (IOException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
        }
      }
    }
  }

  private void readByXMLPull() {
    this.name = (TextView) super.findViewById(R.id.name);
    this.email = (TextView) super.findViewById(R.id.email);
    this.but_read = (Button) super.findViewById(R.id.but);
    this.but_read.setOnClickListener(new OnClickListenerImpl());
  }

  private class OnClickListenerImpl implements OnClickListener {
    @Override
    public void onClick(View v) {
      if (!Environment.getExternalStorageState().equals(
          Environment.MEDIA_MOUNTED)) { // 不存在不操作
        return; // 返回到程序的被调用处
      }
      File file = new File(Environment.getExternalStorageDirectory()
          + File.separator + "xdwang" + File.separator + "test.xml"); // 要输出文件的路径
      if (!file.exists()) { // 文件不存在
        return;
      }
      try {
        InputStream input = new FileInputStream(file);
        MyXMLPullUtil util = new MyXMLPullUtil(input);
        List<LinkMan> all = util.readByXMLPull();
        XMLPullActivity.this.name.setText(all.get(0).getName());
        XMLPullActivity.this.email.setText(all.get(0).getEmail());
      } catch (Exception e) {
        e.printStackTrace();
      }
    }

  }
}

 

 

 

LinkMan.java:

package com.cz.xmlpull;

public class LinkMan {

  private String name;
  private String email;

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public String getEmail() {
    return email;
  }

  public void setEmail(String email) {
    this.email = email;
  }

}