java - 为什么无法解析此XML文件？

我正在申请英语听力

我需要显示级别，名称，音频文件的名称，测试脚本。我想从XML文件中读取信息："dataeasy.xml"

但我什至可以阅读dataeasy.xml的第一个元素

这是我所做的：


activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/linearlayoutXML1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#66CCFF"
android:orientation="vertical" >


<TextView
android:id="@+id/textViewLessonLevel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="30sp"
android:textColor="#000000"
android:textStyle="bold"
android:text="Lesson Level"
android:layout_gravity="center_horizontal"/>


<TextView
android:id="@+id/textViewLessonName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="15sp"
android:textColor="#7f7f7f"
android:textStyle="bold"
android:text="Lesson Name"
android:layout_gravity="center_horizontal" />

<TextView
android:id="@+id/textViewLessonLinkFile"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20sp"
android:textColor="#865521"
android:textStyle="bold"
android:text="Lesson LinkFile"
android:layout_gravity="center_horizontal"
android:layout_marginLeft="40dp"
android:layout_marginRight="40dp" />

<TextView
android:id="@+id/textViewLessonScript"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20sp"
android:textColor="#865521"
android:textStyle="bold"
android:text="Lesson Scipt"
android:layout_gravity="center_horizontal"
android:layout_marginLeft="40dp"
android:layout_marginRight="40dp" />



</LinearLayout>

DataEasyXML.java

 public class DataEasyXML extends DefaultHandler {

 boolean currentElement = false;
 String currentValue = "";

 // Array of lessons
 LessonEasyInfo lessonEasyInfo;
 ArrayList<LessonEasyInfo> List;


 public ArrayList<LessonEasyInfo> getList() {
     return List;
 }

 public void startElement(String uri, String localName, String qName,
                     Attributes attributes) throws SAXException {

     currentElement = true;

     if (qName.equals("Data")) {
         List = new ArrayList<LessonEasyInfo>();
     } else if (qName.equals("Lesson")) {
         lessonEasyInfo = new LessonEasyInfo();
     }
 }

 public void endElement(String uri, String localName, String qName)
         throws SAXException {

     currentElement = false;

     if (qName.equalsIgnoreCase("Level"))
         lessonEasyInfo.setLevel(currentValue.trim());
     else if (qName.equalsIgnoreCase("Name"))
         lessonEasyInfo.setName(currentValue.trim());
     else if (qName.equalsIgnoreCase("LinkFile"))
         lessonEasyInfo.setLinkFile(currentValue.trim());
     else if (qName.equalsIgnoreCase("Script"))
         lessonEasyInfo.setScript(currentValue.trim());
     else if (qName.equalsIgnoreCase("Level"))
         List.add(lessonEasyInfo);

     currentValue = "";
 }

 public void characters(char[] ch, int start, int length)
         throws SAXException {

     if (currentElement) {
         currentValue = currentValue + new String(ch, start, length);
     }
 }
 }

LessonEasyInfo.java

 public class LessonEasyInfo {

 String level = null;
 String name = "";
 String link = "";
 String script = "";

 public String getLevel() {
     return level;
 }

 public void setLevel(String level) {
     this.level = level;
 }

 public String getName() {
     return name;
 }

 public void setName(String name) {
     this.name = name;
 }

 public String getLinkFile() {
     return link;
 }

 public void setLinkFile(String link) {
    this.link = link;
 }

 public String getScript() {
     return script;
 }

 public void setScript(String script) {
     this.script = script;
 }

MainActivity.java

 public class MainActivity extends Activity {

 TextView tvLessonLevel;
 TextView tvLessonName;
 TextView tvLessonLinkFile;
 TextView tvLessonScript;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.activity_main);

     tvLessonLevel = (TextView)findViewById(R.id.textViewLessonLevel);
     tvLessonName = (TextView)findViewById(R.id.textViewLessonName);
     tvLessonLinkFile = (TextView)findViewById(R.id.textViewLessonLinkFile);
     tvLessonScript = (TextView)findViewById(R.id.textViewLessonScript);



     parsedataeasyXML();
 }

 private void parsedataeasyXML(){
     //
     AssetManager assetManager = getBaseContext().getAssets();
     try {
         //Get "dataeasy.xml"
         InputStream is = assetManager.open("dataeasy.xml");
         //
         SAXParserFactory spf = SAXParserFactory.newInstance();
         SAXParser sp = spf.newSAXParser();
         //Read XML Object
         XMLReader xr = sp.getXMLReader();

         // My
         DataEasyXML myXMLHandler = new DataEasyXML();
         //
         xr.setContentHandler(myXMLHandler);
         //Input
         InputSource inStream = new InputSource(is);

         xr.parse(inStream);

         // get the first element
         ArrayList<LessonEasyInfo> List = myXMLHandler.getList();

        tvLessonLevel.setText("Level: " + List.get(0).getLevel());


             tvLessonName.setText("Name: " + List.get(0).getName());


             tvLessonLinkFile.setText("LinkFile : " + List.get(0).getLinkFile());

             tvLessonScript.setText("Script " + List.get(0).getScript());



         is.close();
     } catch (Exception e) {
         e.printStackTrace();
     }
 }

}
dataeasy.xml（数据库文件）：我在这里只写了2个元素

链接在这里：here

最佳答案

下面的代码块永远不会将任何LessonEasyInfo对象添加到列表中，因为如果第一个if表达式的计算结果为true，则不会计算任何其他表达式。

 if (qName.equalsIgnoreCase("Level"))
     lessonEasyInfo.setLevel(currentValue.trim());
 else if (qName.equalsIgnoreCase("Name"))
     lessonEasyInfo.setName(currentValue.trim());
 else if (qName.equalsIgnoreCase("LinkFile"))
     lessonEasyInfo.setLinkFile(currentValue.trim());
 else if (qName.equalsIgnoreCase("Script"))
     lessonEasyInfo.setScript(currentValue.trim());
 else if (qName.equalsIgnoreCase("Level"))
     List.add(lessonEasyInfo);

将上面的代码更改为此

 if (qName.equalsIgnoreCase("Level")) {
     lessonEasyInfo.setLevel(currentValue.trim());
     List.add(lessonEasyInfo);
 }
 else if (qName.equalsIgnoreCase("Name"))
     lessonEasyInfo.setName(currentValue.trim());
 else if (qName.equalsIgnoreCase("LinkFile"))
     lessonEasyInfo.setLinkFile(currentValue.trim());
 else if (qName.equalsIgnoreCase("Script"))
     lessonEasyInfo.setScript(currentValue.trim());