我试图制作一个sax解析器，但我遇到了错误。我尝试了一个教程，当运行它工作正常，但当我把代码放在我自己的Android应用程序中时，它会出错。
有人可以告诉我这是什么问题吗？
这里我有我的代码：
活动：
package nl.appyourservice.ronaldgoedemondt;
import java.net.URL;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;
public class SpeellijstActivity extends Activity {
XMLGettersSetters data;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_speellijst);
/**
* Get the view of the layout within the main layout, so that we can add TextViews.
**/
View layout = findViewById(R.id.layout);
/**
* Create TextView Arrays to add the retrieved data to.
**/
TextView title[];
TextView artist[];
TextView country[];
TextView company[];
TextView price[];
TextView year[];
try {
/**
* Create a new instance of the SAX parser
**/
SAXParserFactory saxPF = SAXParserFactory.newInstance();
SAXParser saxP = saxPF.newSAXParser();
XMLReader xmlR = saxP.getXMLReader();
URL url = new URL("http://www.xmlfiles.com/examples/cd_catalog.xml"); // URL of the XML
/**
* Create the Handler to handle each of the XML tags.
**/
XMLHandler myXMLHandler = new XMLHandler();
xmlR.setContentHandler(myXMLHandler);
xmlR.parse(new InputSource(url.openStream()));
} catch (Exception e) {
System.out.println(e);
}
data = XMLHandler.data;
/**
* Makes the TextView length the size of the TextView arrays by getting the size of the
**/
title = new TextView[data.getTitle().size()];
artist = new TextView[data.getArtist().size()];
country = new TextView[data.getCountry().size()];
company = new TextView[data.getCompany().size()];
price = new TextView[data.getPrice().size()];
year = new TextView[data.getYear().size()];
/**
* Run a for loop to set All the TextViews with text until
* the size of the array is reached.
*
**/
for (int i = 0; i < data.getTitle().size(); i++) {
title[i] = new TextView(this);
title[i].setText("Title = "+data.getTitle().get(i));
artist[i] = new TextView(this);
artist[i].setText("Artist = "+data.getArtist().get(i));
country[i] = new TextView(this);
country[i].setText("Country = "+data.getCountry().get(i));
company[i] = new TextView(this);
company[i].setText("Company = "+data.getCompany().get(i));
price[i] = new TextView(this);
price[i].setText("Price = "+data.getPrice().get(i));
year[i] = new TextView(this);
year[i].setText("Year = "+data.getYear().get(i));
((ViewGroup) layout).addView(title[i]);
((ViewGroup) layout).addView(artist[i]);
((ViewGroup) layout).addView(country[i]);
((ViewGroup) layout).addView(company[i]);
((ViewGroup) layout).addView(price[i]);
((ViewGroup) layout).addView(year[i]);
}
setContentView(layout);
}
}
xml处理程序：
package nl.appyourservice.ronaldgoedemondt;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
public class XMLHandler extends DefaultHandler {
String elementValue = null;
Boolean elementOn = false;
public static XMLGettersSetters data = null;
public static XMLGettersSetters getXMLData() {
return data;
}
public static void setXMLData(XMLGettersSetters data) {
XMLHandler.data = data;
}
/**
* This will be called when the tags of the XML starts.
**/
@Override
public void startElement(String uri, String localName, String qName,
Attributes attributes) throws SAXException {
elementOn = true;
if (localName.equals("CATALOG"))
{
data = new XMLGettersSetters();
} else if (localName.equals("CD")) {
/**
* We can get the values of attributes for eg. if the CD tag had an attribute( <CD attr= "band">Akon</CD> )
* we can get the value "band". Below is an example of how to achieve this.
*
* String attributeValue = attributes.getValue("attr");
* data.setAttribute(attributeValue);
*
* */
}
}
/**
* This will be called when the tags of the XML end.
**/
@Override
public void endElement(String uri, String localName, String qName)
throws SAXException {
elementOn = false;
/**
* Sets the values after retrieving the values from the XML tags
* */
if (localName.equalsIgnoreCase("title"))
data.setTitle(elementValue);
else if (localName.equalsIgnoreCase("artist"))
data.setArtist(elementValue);
else if (localName.equalsIgnoreCase("country"))
data.setCountry(elementValue);
else if (localName.equalsIgnoreCase("company"))
data.setCompany(elementValue);
else if (localName.equalsIgnoreCase("price"))
data.setPrice(elementValue);
else if (localName.equalsIgnoreCase("year"))
data.setYear(elementValue);
}
/**
* This is called to get the tags value
**/
@Override
public void characters(char[] ch, int start, int length)
throws SAXException {
if (elementOn) {
elementValue = new String(ch, start, length);
elementOn = false;
}
}
}
xml文件：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:id="@+id/layout">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:id="@+id/layout_string"/>
</LinearLayout>
xml getter和setter：
package nl.appyourservice.ronaldgoedemondt;
import java.util.ArrayList;
import android.util.Log;
/**
* This class contains all getter and setter methods to set and retrieve data.
*
**/
public class XMLGettersSetters {
private ArrayList<String> title = new ArrayList<String>();
private ArrayList<String> artist = new ArrayList<String>();
private ArrayList<String> country = new ArrayList<String>();
private ArrayList<String> company = new ArrayList<String>();
private ArrayList<String> price = new ArrayList<String>();
private ArrayList<String> year = new ArrayList<String>();
public ArrayList<String> getCompany() {
return company;
}
public void setCompany(String company) {
this.company.add(company);
Log.i("This is the company:", company);
}
public ArrayList<String> getPrice() {
return price;
}
public void setPrice(String price) {
this.price.add(price);
Log.i("This is the price:", price);
}
public ArrayList<String> getYear() {
return year;
}
public void setYear(String year) {
this.year.add(year);
Log.i("This is the year:", year);
}
public ArrayList<String> getTitle() {
return title;
}
public void setTitle(String title) {
this.title.add(title);
Log.i("This is the title:", title);
}
public ArrayList<String> getArtist() {
return artist;
}
public void setArtist(String artist) {
this.artist.add(artist);
Log.i("This is the artist:", artist);
}
public ArrayList<String> getCountry() {
return country;
}
public void setCountry(String country) {
this.country.add(country);
Log.i("This is the country:", country);
}
}
和清单：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="nl.appyourservice.ronaldgoedemondt"
android:versionCode="1"
android:versionName="1.0"
>
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:debuggable='true'
android:allowBackup="true"
android:icon="@drawable/icon_2x"
android:label="@string/app_name"
android:theme="@android:style/Theme.NoTitleBar">
<activity android:name="nl.appyourservice.ronaldgoedemondt.SplashActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="nl.appyourservice.ronaldgoedemondt.MainActivity"></activity>
<activity android:name="nl.appyourservice.ronaldgoedemondt.BiografieActivity"></activity>
<activity android:name="nl.appyourservice.ronaldgoedemondt.SpeellijstActivity"></activity>
<activity android:name="nl.appyourservice.ronaldgoedemondt.SoundboardActivity"></activity>
<activity android:name="nl.appyourservice.ronaldgoedemondt.InfoActivity"></activity>
</application>
如果你知道我做错了什么，请告诉我！〜（我刚接触到这个）