Android中创办与几种解析xml的方法

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>  

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>  

?