我有一个 XML 文件，如下所示：
<questions title="(Some question Category)">
<question>
<ask>(Some question)?</ask>
<answer>(Some answer)</answer>
<answer correct="true">(Some correct answer)</answer>
<answer>(Some answer)</answer>
<answer>(Some answer)</answer>
</question>
</questions>
我正在使用 SAX 来解析文件。据我所知，所有必需的 SAX 文件都已正确设置。
然后我有一个处理程序类，我查找了如何为稍微不同的 XML 文件编写代码。我尝试为上面的 xml 调整它，这就是我想出的（未完成）：
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
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;
import android.content.Context;
import android.graphics.Color;
import android.util.Log;
import android.widget.TextView;
public class QuestionHandler extends DefaultHandler {
//list for imported product data
private ArrayList<TextView> theViews;
//string to track each entry
private String currQuestion = "";
//flags to keep track of XML processing
private boolean isAsk = false;
private boolean isAnswer = false;
//context for user interface
private Context theContext;
//constructor
public QuestionHandler(Context cont) {
super();
theViews = new ArrayList<TextView>();
theContext = cont;
}
//start of the XML document
public void startDocument () { Log.i("QuestionHandler", "Start of XML document"); }
//end of the XML document
public void endDocument () { Log.i("QuestionHandler", "End of XML document"); }
//opening element tag
public void startElement (String uri, String name, String qName, Attributes atts)
{
//find out if the element is a question
if(qName.equals("question"))
{
//set ask and answer tag to false
isAsk = false;
isAnswer = false;
//create View item for question display
TextView questionView = new TextView(theContext);
questionView.setTextColor(Color.rgb(73, 136, 83));
//add the attribute value to the displayed text
String viewText = "Items from " + atts.getValue("name") + ":";
questionView.setText(viewText);
//add the new view to the list
theViews.add(questionView);
}
//or if the element is an asked question
else if(qName.equals("ask"))
isAsk = true;
//or if element is an answer
else if(qName.equals("answer"))
isAnswer = true;
}
//closing element tag
public void endElement (String uri, String name, String qName)
{
if(qName.equals("question"))
{
//create a View item for the asked
TextView askView = new TextView(theContext);
askView.setTextColor(Color.rgb(192, 199, 95));
//display the compiled items
askView.setText(currQuestion);
//add to the list
theViews.add(askView);
//create a View item for the answers
TextView answersView = new TextView(theContext);
answersView.setTextColor(Color.rgb(192, 199, 95));
//display the compiled items
answersView.setText(currQuestion);
//add to the list
theViews.add(answersView);
//reset the variable for future items
currQuestion = "";
}
}
//element content
public void characters (char ch[], int start, int length)
{
//string to store the character content
String currText = "";
//loop through the character array
for (int i=start; i<start+length; i++)
{
switch (ch[i]) {
case '\\':
break;
case '"':
break;
case '\n':
break;
case '\r':
break;
case '\t':
break;
default:
currText += ch[i];
break;
}
}
//prepare for the next item
if(isAsk || isAnswer && currText.length()>0)
currQuestion += currText+"\n";
}
public ArrayList<TextView> getData()
{
//take care of SAX, input and parsing errors
try
{
//set the parsing driver
System.setProperty("org.xml.sax.driver","org.xmlpull.v1.sax2.Driver");
//create a parser
SAXParserFactory parseFactory = SAXParserFactory.newInstance();
SAXParser xmlParser = parseFactory.newSAXParser();
//get an XML reader
XMLReader xmlIn = xmlParser.getXMLReader();
//instruct the app to use this object as the handler
xmlIn.setContentHandler(this);
//provide the name and location of the XML file **ALTER THIS FOR YOUR FILE**
URL xmlURL = new URL("http://www.macs.hw.ac.uk/~pjbk/quiz/example.xml");
//open the connection and get an input stream
URLConnection xmlConn = xmlURL.openConnection();
InputStreamReader xmlStream = new InputStreamReader(xmlConn.getInputStream());
//build a buffered reader
BufferedReader xmlBuff = new BufferedReader(xmlStream);
//parse the data
xmlIn.parse(new InputSource(xmlBuff));
}
catch(SAXException se) { Log.e("AndroidTestsActivity",
"SAX Error " + se.getMessage()); }
catch(IOException ie) { Log.e("AndroidTestsActivity",
"Input Error " + ie.getMessage()); }
catch(Exception oe) { Log.e("AndroidTestsActivity",
"Unspecified Error " + oe.getMessage()); }
//return the parsed product list
return theViews;
}
}
最后，我的 initialiseQuestions() 方法，来自其他工作活动，将提取的 XML 数据分配给问题类（同样，未完成）：
private void initialiseQuestions() {
// TODO Auto-generated method stub
questions = new Vector<Question>(); //Vector containing our questions
try
{
//create an instance of the QuestionHandler class
QuestionHandler handler = new QuestionHandler(getApplicationContext());
//get the string list by calling the public method
ArrayList<TextView> newViews = handler.getData();
//convert to an array
Object[] question = newViews.toArray();
//loop through the items, creating a View item for each
for(int i=0; i<question.length; i++)
{
//add the next question in the list
Question q1 = new Question(question[i]);
q1.addAnswer("Harold Godwin", false);
q1.addAnswer("Edward the Confessor", false);
q1.addAnswer("William the Conqueror", true);
q1.addAnswer("Alfred the Great", false);
questions.add(q1);
//mainLayout.addView((TextView)products[i]);
}
}
catch(Exception pce) { Log.e("AndroidTestsActivity", "PCE "+pce.getMessage()); }
我的主要问题是我真的不明白我在做什么/需要在处理程序和 initialiseQuestions 方法中进行更改。我不明白字符串是如何在处理程序中创建的（如果您只需要发回一个字符串数组，为什么还需要 textViews？）而且我不明白如何在 initialiseQuestions 中处理数据。如您所见， initaliseQuestions 方法应采用已解析的 XML 并使用数据实例化问题对象。
有人能告诉我我需要改变什么吗？
这是我一直在尝试调整的教程