如何從EditText解析XML？

Question

我嘗試用xml解析器構建應用程序。

例如：http://www.androidpeople.com/android-xml-parsing-tutorial-using-saxparser

，但我想從EditText上解析XML文件，它是如何工作的？

Answer 1

您有幾種方法來解析XML，使用最廣泛的是SAX和DOM。選擇是相當戰略的。

這裏是SAX的一個簡短的說明：

• 你會需要一些import S：

  import org.xml.sax.Attributes; 
  import org.xml.sax.SAXException; 
  import org.xml.sax.SAXParseException; 
  import org.xml.sax.helpers.DefaultHandler; 
  import android.util.Xml; 
  

• 創建您自己的XML SAX DefaultHandler：

  class MySaxHandler extends DefaultHandler { 
      // Override the methods of DefaultHandler that you need. 
      // See [this link][3] to see these methods. 
      // These methods are going to be called while the XML is read 
      // and will allow you doing what you need with the content. 
      // Two examples below: 
  
      public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException { 
       // This is called each time an openeing XML tag is read. 
       // As the tagname is passed by parameter you know which tag it is. 
       // You also have the attributes of the tag. 
       // Example <mytag myelem="12"> will lead to a call of 
       // this method with the parameters: 
       // - localName = "mytag" 
       // - attributes = { "myelem", "12" } 
      } 
  
      public void characters(char[] ch, int start, int length) throws SAXException { 
       // This is called each time some text is read. 
       // As an example, if you have <myTag>blabla</myTag> 
       // this will be called with the parameter "blabla" 
       // Warning 1: this is also called when linebreaks are read and the linebreaks are passed 
       // Warning 2: you have to memorize the last open tag to determine what tag this text belongs to (I usually use a stack). 
      } 
  } 
  

• 提取物將XML作爲StringEditText。讓我們把它xmlContent

• 創建和初始化您的XML解析器：

  final InputStreamReader reader = new InputStreamReader(new ByteArrayInputStream(xmlContent.getBytes())); 
  final MySaxHandler handler = new MySaxHandler(); 
  

• ，然後做出解析器讀取XML內容。這會導致您的MySaxHandler在讀數正在進行時調用其各種方法。

  Xml.parse(reader, handler); 
  

Answer 2

改變這一行：

xr.parse(new InputSource(sourceUrl.openStream())); 

到

String xmlString = editText.getText().toString(); 
StringReader reader = new StringReader(xmlString); 
xr.parse(new InputSource(reader));