Android应用开发之XML文件解析之二

4MyXmlParser案例

4.1案例代码陈列

<?xml version="1.0" encoding="UTF-8"?>
<xml>
<android id="1">
<version>1.5</version>
<name>Cupcake</name>
</android>
<android id="2">
<version>1.6</version>
<name>Donut</name>
</android>
<android id="3">
<version>2.1</version>
<name>Eclair</name>
</android>
<android id="4">
<version>2.2</version>
<name>Froyo</name>
</android>
<android id="5">
<version>2.3</version>
<name>Gingerbread</name>
</android>
<android id="6">
<version>3.0</version>
<name>Honeycomb</name>
</android>
<android id="7">
<version>4.0</version>
<name>Ice Cream Sandwich</name>
</android>
<android id="8">
<version>4.1</version>
<name>Jelly Bean</name>
</android>
</xml>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="top" >

<Button android:id="@+id/btnSAX"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="SAX解析" />
<Button android:id="@+id/btnPull"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Pull解析" />
<Button android:id="@+id/btnDom"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="DOM解析" />
</LinearLayout>

<ListView
android:id="@+id/listview"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:gravity="center" >

<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:src="@drawable/ic_launcher"
android:layout_weight="1" />

<TextView
android:id="@+id/textid"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1" />

<TextView
android:id="@+id/textversion"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1" />

<TextView
android:id="@+id/textname"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1" />

</LinearLayout>

package com.leverage.myxmlparser;

import java.io.InputStream;
import java.util.HashMap;
import java.util.List;

public interface IMyParser {
public static final String ELEMENT_ANDROID = "android";
public static final String ELEMENT_ID = "id";
public static final String ELEMENT_VERSION = "version";
public static final String ELEMENT_NAME = "name";

public void parse(InputStream in) throws Exception;
public List<HashMap<String, String>> getResult();
}

package com.leverage.myxmlparser;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;

public class MySAXParser implements IMyParser {
private List<HashMap<String, String>> datas; // 存储所有的解析对象

@Override
public void parse(InputStream in) throws Exception {
SAXParserFactory saxParserFactory = SAXParserFactory.newInstance();
SAXParser saxParser = saxParserFactory.newSAXParser();
XMLReader xmlReader = saxParser.getXMLReader();
xmlReader.setContentHandler(new MySAXHandler());
xmlReader.parse(new InputSource(in));
}

@Override
public List<HashMap<String, String>> getResult() {
return datas;
}

private class MySAXHandler extends DefaultHandler {
private String currentElement; // 当前解析的元素
private HashMap<String, String> data; // 存储单个的解析对象

@Override
public void startDocument() throws SAXException {
super.startDocument();
datas = new ArrayList<HashMap<String, String>>();
}

// uri 命名空间URI
// localName 不带命名空间标签的元素名
// qName 带命名空间的元素名
// attributes 元素属性
@Override
public void startElement(String uri, String localName, String qName,
Attributes attributes) throws SAXException {
super.startElement(uri, localName, qName, attributes);
currentElement = localName;
if (ELEMENT_ANDROID.equals(currentElement)) {
data = new HashMap<String, String>();
}
if(attributes != null && data != null) {
for (int i = 0; i < attributes.getLength(); i++) {
data.put(attributes.getLocalName(i), attributes.getValue(i));
}
}
}

@Override
public void characters(char[] ch, int start, int length)
throws SAXException {
super.characters(ch, start, length);
String tmp = new String(ch, start, length);
boolean flag = !tmp.trim().equals("") && !tmp.trim().equals("\n");
if (ELEMENT_VERSION.equals(currentElement) && flag) {
data.put(ELEMENT_VERSION, tmp);
} else if (ELEMENT_NAME.equals(currentElement) && flag) {
data.put(ELEMENT_NAME, tmp);
}
}

@Override
public void endElement(String uri, String localName, String qName)
throws SAXException {
super.endElement(uri, localName, qName);
if (ELEMENT_ANDROID.equals(localName)) {
datas.add(data);
}
}
}
}

package com.leverage.myxmlparser;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import org.xmlpull.v1.XmlPullParser;

import android.util.Xml;

public class MyPullParser implements IMyParser {
private HashMap<String, String> data; // 存储单个的解析对象
private List<HashMap<String, String>> datas; // 存储所有的解析对象

@Override
public void parse(InputStream in) throws Exception {
XmlPullParser xmlPullParser = Xml.newPullParser();
xmlPullParser.setInput(in, "UTF-8");
int eventType = xmlPullParser.getEventType();
while(eventType != XmlPullParser.END_DOCUMENT) {
switch (eventType) {
case XmlPullParser.START_DOCUMENT:
datas = new ArrayList<HashMap<String,String>>();
case XmlPullParser.START_TAG:
String tag = xmlPullParser.getName();
if(tag != null && tag.equals(ELEMENT_ANDROID) ) {
data = new HashMap<String, String>();
data.put(ELEMENT_ID, xmlPullParser.getAttributeValue(null, ELEMENT_ID));
} else if (data != null) {
if(tag.equals(ELEMENT_VERSION)) {
data.put(ELEMENT_VERSION, xmlPullParser.nextText());
} else if (tag.equals(ELEMENT_NAME)) {
data.put(ELEMENT_NAME, xmlPullParser.nextText());
}
}
break;
case XmlPullParser.END_TAG:
if(xmlPullParser.getName().equals(ELEMENT_ANDROID) && data != null) {
datas.add(data);
data = null;
}
break;
default:
break;
}
eventType = xmlPullParser.next();
}
}

@Override
public List<HashMap<String, String>> getResult() {
return datas;
}

}

package com.leverage.myxmlparser;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

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

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

public class MyDOMParser implements IMyParser {
private HashMap<String, String> data; // 存储单个的解析对象
private List<HashMap<String, String>> datas = new ArrayList<HashMap<String,String>>(); // 存储所有的解析对象

@Override
public void parse(InputStream in) throws Exception {
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
Document document = documentBuilder.parse(in);
Element root = document.getDocumentElement();
NodeList nodes = root.getElementsByTagName(ELEMENT_ANDROID);
for (int i = 0; i < nodes.getLength(); i++) {
data = new HashMap<String, String>();
Element dataElement = (Element) nodes.item(i);
data.put(ELEMENT_ID, dataElement.getAttribute(ELEMENT_ID));
Element verElement = (Element) dataElement.getElementsByTagName(ELEMENT_VERSION).item(0);
data.put(ELEMENT_VERSION, verElement.getFirstChild().getNodeValue());
Element nameElement = (Element) dataElement.getElementsByTagName(ELEMENT_NAME).item(0);
data.put(ELEMENT_NAME, nameElement.getFirstChild().getNodeValue());
datas.add(data);
}
}

@Override
public List<HashMap<String, String>> getResult() {
return datas;
}

}

package com.leverage.myxmlparser;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;

public class TestXmlParseActivity extends Activity {
public static final String TAG = TestXmlParseActivity.class.getSimpleName();
private ListView mListView;
private Button mSaxBtn;
private Button mPullBtn;
private Button mDomBtn;
//    private IMyParser myParser;
private List<HashMap<String, String>> datas = new ArrayList<HashMap<String,String>>();
private MyOnClickListener myOnClickListener = new MyOnClickListener();

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.listview);
mListView = (ListView) findViewById(R.id.listview);
mSaxBtn = (Button) findViewById(R.id.btnSAX);
mPullBtn = (Button) findViewById(R.id.btnPull);
mDomBtn = (Button) findViewById(R.id.btnDom);
//        InputStream in = null;
//        try {
//            in = getAssets().open("source.xml");
//            IMyParser myParser = new MySAXParser();
//            IMyParser myParser = new MyPullParser();
//            IMyParser myParser = new MyDOMParser();
//            myParser.parse(in);
//            datas = myParser.getResult();
//            System.out.println("datas = " + datas.toString());
//        } catch (Exception e) {
//            Log.e(TAG, e.getMessage());
//        } finally {
//            if(in != null) {
//                try {
//                    in.close();
//                } catch (IOException e) {
//                    Log.e(TAG, e.getMessage());
//                }
//            }
//        }
mSaxBtn.setOnClickListener(myOnClickListener);
mPullBtn.setOnClickListener(myOnClickListener);
mDomBtn.setOnClickListener(myOnClickListener);

//        InputStream in = null;
//        try {
//            in = getAssets().open("source.xml");
//            IMyParser myParser = new MySAXParser();
//            IMyParser myParser = new MyPullParser();
//            myParser = new MyDOMParser();
//            myParser.parse(in);
//            datas = myParser.getResult();
//            System.out.println("datas = " + datas.toString());
//        } catch (Exception e) {
//            Log.e(TAG, e.getMessage());
//        } finally {
//            if(in != null) {
//                try {
//                    in.close();
//                } catch (IOException e) {
//                    Log.e(TAG, e.getMessage());
//                }
//            }
//        }
//        mListView.setAdapter(new MyListAdapter(this, datas));
}

private void parseXML(IMyParser parser) {
mListView.setAdapter(null);
InputStream in = null;
try {
in = getAssets().open("source.xml");
//            IMyParser myParser = new MySAXParser();
//            IMyParser myParser = new MyPullParser();
//            myParser = new MyDOMParser();
parser.parse(in);
datas = parser.getResult();
System.out.println("datas = " + datas.toString());
} catch (Exception e) {
Log.e(TAG, e.getMessage());
} finally {
if(in != null) {
try {
in.close();
} catch (IOException e) {
Log.e(TAG, e.getMessage());
}
}
}
mListView.setAdapter(new MyListAdapter(this, datas));
}

private class MyOnClickListener implements View.OnClickListener {
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btnSAX:
parseXML(new MySAXParser());
break;
case R.id.btnPull:
parseXML(new MyPullParser());
break;
case R.id.btnDom:
parseXML(new MyDOMParser());
break;
default:
break;
}
}

}

private class MyListAdapter extends BaseAdapter {
private Context context;
private List<HashMap<String, String>> datas;

public MyListAdapter(Context context, List<HashMap<String, String>> datas) {
this.context = context;
this.datas = datas;
}

@Override
public int getCount() {
return datas.size();
}

@Override
public Object getItem(int position) {
return datas.get(position);
}

@Override
public long getItemId(int position) {
return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
View result = convertView;
if(result == null) {
result = LayoutInflater.from(context).inflate(R.layout.listitem, null);
}
TextView idTextView = (TextView) result.findViewById(R.id.textid);
TextView versionTextView = (TextView) result.findViewById(R.id.textversion);
TextView nameTextView = (TextView) result.findViewById(R.id.textname);
idTextView.setText(datas.get(position).get(IMyParser.ELEMENT_ID));
versionTextView.setText(datas.get(position).get(IMyParser.ELEMENT_VERSION));
nameTextView.setText(datas.get(position).get(IMyParser.ELEMENT_NAME));
return result;
}

}
}

4.2案例效果展示

4.3案例源码下载