Android中创建与几种解析xml的方法!

第一步:新建一个Android工程,命名为XmlDemo.

第二步:修改main.xml布局文件，代码如下:

<?xml version="1.0" encoding="utf-8"?>  
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:orientation="vertical"  
    android:layout_width="fill_parent"  
    android:layout_height="fill_parent"  
    >  
    <Button  
        android:id="@+id/btn1"  
        android:layout_width="fill_parent"   
        android:layout_height="wrap_content"   
        android:text="创建XML文件"  
    />  
    <Button  
        android:id="@+id/btn2"  
        android:layout_width="fill_parent"   
        android:layout_height="wrap_content"   
        android:text="DOM解析XML"  
    />  
    <Button  
        android:id="@+id/btn3"  
        android:layout_width="fill_parent"   
        android:layout_height="wrap_content"   
        android:text="XmlPullParse解析XML"  
    />  
    <TextView  
        android:id="@+id/result"  
        android:layout_width="fill_parent"   
        android:layout_height="wrap_content"   
    />  
</LinearLayout>  

 第三步:修改主核心程序XmlDemo.java,代码如下:

public class WriteXML extends Activity implements OnClickListener{
	 private static final String BOOKS_PATH = "/sdcard/books2.xml";  
	    private Button mButton1,mButton2,mButton3;  
	    private TextView mTextView;  
	    @Override  
	    public void onCreate(Bundle savedInstanceState) {  
	        super.onCreate(savedInstanceState);  
	        setContentView(R.layout.main);  
	        setupViews();  
	    }  
	    //初始化工作  
	    private void setupViews(){  
	        mTextView = (TextView)findViewById(R.id.result);  
	        mButton1 = (Button)findViewById(R.id.btn1);  
	        mButton2 = (Button)findViewById(R.id.btn2);  
	        mButton3 = (Button)findViewById(R.id.btn3);  
	        mButton1.setOnClickListener(this);  
	        mButton2.setOnClickListener(this);  
	        mButton3.setOnClickListener(this);  
	    }  
	    //创建xml文件  
	    private void createXmlFile(){  
	        File linceseFile = new File(BOOKS_PATH);  
	        try{  
	            linceseFile.createNewFile();  
	        }catch (IOException e) {  
	            Log.e("IOException", "exception in createNewFile() method");  
	        }  
	        FileOutputStream fileos = null;  
	        try{  
	            fileos = new FileOutputStream(linceseFile);  
	        }catch (FileNotFoundException  e) {  
	            Log.e("FileNotFoundException", "can't create FileOutputStream");  
	        }  
	        XmlSerializer serializer = Xml.newSerializer();  
	        try {  
	            serializer.setOutput(fileos,"UTF-8");  
	            serializer.startDocument(null, true);  
	            serializer.startTag(null, "books");  
	            for(int i = 0; i < 3; i ++){  
	                serializer.startTag(null, "book");  
	                serializer.startTag(null, "bookname");  
	                serializer.text("Android教程" + i);  
	                serializer.endTag(null, "bookname");  
	                serializer.startTag(null, "bookauthor");  
	                serializer.text("Frankie" + i);  
	                serializer.endTag(null, "bookauthor");  
	                serializer.endTag(null, "book");  
	            }  
	          
	            serializer.endTag(null, "books");  
	            serializer.endDocument();  
	            serializer.flush();  
	            fileos.close();  
	        } catch (Exception e) {  
	            Log.e("Exception","error occurred while creating xml file");  
	        }  
	        Toast.makeText(getApplicationContext(), "创建xml文件成功!", Toast.LENGTH_SHORT).show();  
	    }  
	    //dom解析xml文件  
	    private void domParseXML(){  
	        File file = new File(BOOKS_PATH);  
	        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();        
	        DocumentBuilder db = null;    
	        try {  
	            db = dbf.newDocumentBuilder();  
	        } catch (ParserConfigurationException e) {  
	            e.printStackTrace();  
	        }  
	        Document doc = null;  
	        try {  
	            doc = db.parse(file);  
	        } catch (SAXException e) {  
	            e.printStackTrace();  
	        } catch (IOException e) {  
	            e.printStackTrace();  
	        }  
	        Element root = doc.getDocumentElement();  
	        NodeList books = root.getElementsByTagName("book");  
	        String res = "本结果是通过dom解析:" + "\n";  
	        for(int i = 0; i < books.getLength();i++){  
	            Element book = (Element)books.item(i);  
	            Element bookname = (Element)book.getElementsByTagName("bookname").item(0);  
	            Element bookauthor = (Element)book.getElementsByTagName("bookauthor").item(0);  
	            res += "书名: " + bookname.getFirstChild().getNodeValue() + " " +  
	                   "作者: " + bookauthor.getFirstChild().getNodeValue() + "\n";  
	        }  
	          
	        mTextView.setText(res);  
	    }  
	    
	    //xmlPullParser解析xml文件  
	    private void xmlPullParseXML(){  
	        String res = "本结果是通过XmlPullParse解析:" + "\n";  
	        try {             
	            XmlPullParserFactory factory = XmlPullParserFactory.newInstance();  
	            XmlPullParser xmlPullParser = factory.newPullParser();  
	              
	            xmlPullParser.setInput(Thread.currentThread().getContextClassLoader()  
	                    .getResourceAsStream(BOOKS_PATH), "UTF-8");  
	              
	            int eventType = xmlPullParser.getEventType();  
	              
	            try{  
	                while (eventType != XmlPullParser.END_DOCUMENT) {  
	                    String nodeName = xmlPullParser.getName();  
	                    switch (eventType) {  
	                    case XmlPullParser.START_TAG:  
	                        if("bookname".equals(nodeName)){      
	                            res += "书名: " + xmlPullParser.nextText() + " ";                   
	                        }else if("bookauthor".equals(nodeName)){  
	                            res += "作者: " + xmlPullParser.nextText() + "\n";  
	                        }  
	                        break;  
	                    default:  
	                        break;  
	                    }  
	                    eventType = xmlPullParser.next();  
	                }  
	            } catch (IOException e) {  
	                e.printStackTrace();  
	            }     
	        } catch (XmlPullParserException e) {  
	            e.printStackTrace();  
	        }  
	          
	        mTextView.setText(res);  
	    }  
	    //按钮事件响应  
	    public void onClick(View v) {  
	        if(v == mButton1){  
	            createXmlFile();  
	        }else if(v == mButton2){  
	            domParseXML();            
	        }else if(v == mButton3){  
	            xmlPullParseXML();  
	        }  
	    }         
}

 第四步:由于我们在Sd卡上新建了文件，需要增加权限，如下代码(第16行):

<?xml version="1.0" encoding="utf-8"?>  
<manifest xmlns:android="http://schemas.android.com/apk/res/android"  
      package="com.tutor.xml"  
      android:versionCode="1"  
      android:versionName="1.0">  
    <application android:icon="@drawable/icon" android:label="@string/app_name">  
        <activity android:name=".XmlDemo"  
                  android:label="@string/app_name">  
            <intent-filter>  
                <action android:name="android.intent.action.MAIN" />  
                <category android:name="android.intent.category.LAUNCHER" />  
            </intent-filter>  
        </activity>  
    </application>  
    <uses-sdk android:minSdkVersion="7" />  
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />   
</manifest>   

 注意:模拟器要建一个SD卡，否则出错。

books.xml内容如下:

<?xml version='1.0' encoding='UTF-8' standalone='yes' ?>  
<books>  
    <book>  
      <bookname>Android教程0</bookname>  
      <bookauthor>Frankie0</bookauthor>  
   </book>  
   <book>  
      <bookname>Android教程1</bookname>  
      <bookauthor>Frankie1</bookauthor>  
   </book>  
   <book>  
      <bookname>Android教程2</bookname>  
      <bookauthor>Frankie2</bookauthor>  
   </book>  
</books>