android - 解析XML并在TextView中显示

Question

我正在制作测验申请。对于 MCQ 问题，我有一个 XML，我已经对其进行了解析。 这是 XML:

<quiz>
<mchoice>
<question>Not a team sport for sure</question>
<id>1</id>
<option1>Cricket</option1>
<option2>Tennis</option2>
<option3>Rugby</option3>
<option4>Soccer</option4>
<answer>Tennis</answer>
</mchoice>
<mchoice>
<question>I am the biggest planet in the Solar System</question>
<id>2</id>
<option1>Saturn</option1>
<option2>Jupiter</option2>
<option3>Neptune</option3>
<option4>Pluto</option4>
<answer>Jupiter</answer>
</mchoice>
<mchoice>
<question>I am the closest star to the earth</question>
<id>3</id>
<option1>Milky way</option1>
<option2>Moon</option2>
<option3>Sun</option3>
<option4>North Star</option4>
<answer>Sun</answer>
</mchoice>
<mchoice>
<question>A number which is not prime</question>
<id>4</id>
<option1>31</option1>
<option2>61</option2>
<option3>71</option3>
<option4>91</option4>
<answer>91</answer>
</mchoice>
<mchoice>
<question>Which is correct?</question>
<id>5</id>
<option1>Foreine</option1>
<option2>Fariegn</option2>
<option3>Foreig</option3>
<option4>Foreign</option4>
<answer>Foreign</answer>
</mchoice>
</quiz>

这是我使用过的XML Parser 类:

public class XMLParser {

    // constructor
    public XMLParser() {

    }

    /**
     * Getting XML from URL making HTTP request
     * @param url string
     * */
    public String getXmlFromUrl(String url) {
        String xml = null;

        try {
            // defaultHttpClient
            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpPost httpPost = new HttpPost(url);

            HttpResponse httpResponse = httpClient.execute(httpPost);
            HttpEntity httpEntity = httpResponse.getEntity();
            xml = EntityUtils.toString(httpEntity);

        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        // return XML
        return xml;
    }

    /**
     * Getting XML DOM element
     * @param XML string
     * */
    public Document getDomElement(String xml){
        Document doc = null;
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        try {

            DocumentBuilder db = dbf.newDocumentBuilder();

            InputSource is = new InputSource();
                is.setCharacterStream(new StringReader(xml));
                doc = db.parse(is); 

            } catch (ParserConfigurationException e) {
                Log.e("Error: ", e.getMessage());
                return null;
            } catch (SAXException e) {
                Log.e("Error: ", e.getMessage());
                return null;
            } catch (IOException e) {
                Log.e("Error: ", e.getMessage());
                return null;
            }

            return doc;
    }

    /** Getting node value
      * @param elem element
      */
     public final String getElementValue( Node elem ) {
         Node child;
         if( elem != null){
             if (elem.hasChildNodes()){
                 for( child = elem.getFirstChild(); child != null; child = child.getNextSibling() ){
                     if( child.getNodeType() == Node.TEXT_NODE  ){
                         return child.getNodeValue();
                     }
                 }
             }
         }
         return "";
     }

     /**
      * Getting node value
      * @param Element node
      * @param key string
      * */
     public String getValue(Element item, String str) {     
            NodeList n = item.getElementsByTagName(str);        
            return this.getElementValue(n.item(0));
        }
}

这是我调用 XML 解析器类并将解析后的数据添加到其中包含 hashMap 的 Arraylist 的 Activity :

// All static variables
    static final String URL = "http://gujaratimandal.org/data.xml";
    // XML node keys
    static final String KEY_MCHOICE = "mchoice"; // parent node
    static final String KEY_QUESTION = "question";
    static final String KEY_ID = "id";
    static final String KEY_OPTION1 = "option1";
    static final String KEY_OPTION2 = "option2";
    static final String KEY_OPTION3 = "option3";
    static final String KEY_OPTION4 = "option4";
    static final String KEY_ANSWER = "answer";
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);



        ArrayList<HashMap<String, String>> menuItems = new ArrayList<HashMap<String, String>>();

        XMLParser parser = new XMLParser();
        String xml = parser.getXmlFromUrl(URL); // getting XML
        Document doc = parser.getDomElement(xml); // getting DOM element

        NodeList nl = doc.getElementsByTagName(KEY_MCHOICE);
        // looping through all item nodes <item>
        for (int i = 0; i < nl.getLength(); i++) {
            // creating new HashMap
            HashMap<String, String> map = new HashMap<String, String>();
            Element e = (Element) nl.item(i);
            // adding each child node to HashMap key => value
            map.put(KEY_MCHOICE, parser.getValue(e, KEY_MCHOICE));
            map.put(KEY_ID, parser.getValue(e, KEY_ID));
            map.put(KEY_QUESTION, parser.getValue(e, KEY_QUESTION));
            //map.put(KEY_QUESTION, parser.getValue(e, KEY_QUESTION));

            map.put(KEY_OPTION1, parser.getValue(e, KEY_OPTION1));
            map.put(KEY_OPTION2, parser.getValue(e, KEY_OPTION2));
            map.put(KEY_OPTION3, parser.getValue(e, KEY_OPTION3));
            map.put(KEY_OPTION4, parser.getValue(e, KEY_OPTION4));
            map.put(KEY_ANSWER,  parser.getValue(e, KEY_ANSWER));
            // adding HashList to ArrayList
            menuItems.add(map);


            for (HashMap.Entry<String, String> entry : map.entrySet()) {
                String display_id=entry.getKey();
                String display_question = entry.getValue();
               makeAToast( ""+display_id+":"+ display_question);

            }


        }

         makeAToast(""+menuItems.size());
}

     public void makeAToast(String str) {

            Toast toast = Toast.makeText(this,str, Toast.LENGTH_LONG);
            toast.setGravity(Gravity.BOTTOM, 0, 0);
            toast.setDuration(1000000);
            toast.show();
        }

问题是，数据正在被检索，但不是以期望的方式。

我想检索以下格式的数据:

这样我就可以用每个问题的数据填充这些 TextView:

我应该做什么？

Answer 1

在公开课 Activity 中创建一个字符串

字符串 keyoption,keyoption2,名称;

和

for (int i = 0; i < nl.getLength(); i++) {

    HashMap<String, String> map = new HashMap<String, String>();
    Element e = (Element) nl.item(i);

    keyoption = parser.getValue(e, KEY_OPTION1);
    keyoption2 = parser.getValue(e, KEY_OPTION2);

    map.put(KEY_OPTION1, keyoption);
    map.put(KEY_OPTION2, keyoption2);
}

name.setText(keyoption);