Android应用开发之XML文件解析之二

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4MyXmlParser案例

4.1案例代码陈列

待解析的xml格式数据：source.xml

<?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>

listview.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>

listitem.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="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>

IMyParser.java

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();
}

MySAXParser.java

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);
            }
        }
    }
}

MyPullParser.java

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;
    }

}

MyDOMParser.java

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;
    }

}

XmlParserActivity.java

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

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