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我有這些類和函數：從XMLAndroid的SAXParser的工作2.2.1但不是2.2
閱讀喜好
private void readPreferences(InputSource is) {
PrefsFetcher pf = new PrefsFetcher();
prefs = pf.getPreferences(is);
if (prefs == null) {
Log.d(Constants.TAG, "prefs == null");
}
// save to DB
savePreferences();
}
偏好提取程序
public class PrefsFetcher {
public ArrayList<Preferences> getPreferences(InputSource is) {
ArrayList<Preferences> prefs = null;
try {
SAXParserFactory factory = SAXParserFactory.newInstance();
SAXParser saxParser = factory.newSAXParser();
XMLReader xmlReader = saxParser.getXMLReader();
PrefsHandler handler = new PrefsHandler();
xmlReader.setContentHandler(handler);
Log.d(Constants.TAG, "Parsing XML");
xmlReader.parse(is);
prefs = handler.getPreferences();
} catch (Exception e) {
e.printStackTrace();
}
return prefs;
}
}
首處理器
public class PrefsHandler extends DefaultHandler {
private static final String PREFERENCES = "preferences";
private static final String DNI = "id";
private static final String FREQUENCY = "interval";
private static final String PHONE_NUMBER = "phoneNumber";
private static final String SERVER_ADDRESS = "serverAddress";
private static final String SERVER_PORT = "serverPort";
private static final String SERVER_PREF_ADDRESS = "prefAddress";
private static final String SERVER_PREF_PORT = "prefPort";
private boolean idChars;
private boolean frequencyChars;
private boolean phoneNumberChars;
private boolean serverAddressChars;
private boolean serverPortChars;
private boolean prefAddressChars;
private boolean prefPortChars;
boolean startPreferences;
private int numPrefs;
private Preferences pref;
private final ArrayList<Preferences> prefs;
public PrefsHandler(){
this.prefs = new ArrayList<Preferences>();
}
@Override
public void startDocument(){
}
@Override
public void startElement(String uri, String localName, String qName, Attributes atts) {
//Log.d(Constants.TAG, "XML localName: " + localName + " qName: " + qName);
if (localName.equals(PREFERENCES)) {
this.startPreferences = true;
this.pref = new Preferences();
}
if (this.startPreferences){
if (localName.equals(FREQUENCY)) {
this.frequencyChars = true;
} else if (localName.equals(PHONE_NUMBER)) {
this.phoneNumberChars = true;
} else if (localName.equals(DNI)) {
this.idChars = true;
} else if (localName.equals(SERVER_ADDRESS)) {
this.serverAddressChars = true;
} else if (localName.equals(SERVER_PORT)) {
this.serverPortChars = true;
} else if (localName.equals(SERVER_PREF_ADDRESS)) {
this.prefAddressChars = true;
} else if (localName.equals(SERVER_PREF_PORT)) {
this.prefPortChars = true;
}
}
}
@Override
public void endDocument(){}
@Override
public void endElement(String uri, String localName, String qName) {
if (localName.equals(PREFERENCES)){
this.startPreferences = false;
this.numPrefs++;
this.prefs.add(this.pref);
}
if (this.startPreferences){
if (localName.equals(FREQUENCY)) {
this.frequencyChars = false;
} else if (localName.equals(PHONE_NUMBER)) {
this.phoneNumberChars = false;
} else if (localName.equals(DNI)) {
this.idChars = false;
} else if (localName.equals(SERVER_ADDRESS)) {
this.serverAddressChars = false;
} else if (localName.equals(SERVER_PORT)) {
this.serverPortChars = false;
} else if (localName.equals(SERVER_PREF_ADDRESS)) {
this.prefAddressChars = false;
} else if (localName.equals(SERVER_PREF_PORT)) {
this.prefPortChars = false;
}
}
}
@Override
public void characters(char [] ch, int start, int length) {
String chString = "";
if (ch != null) {
chString = new String (ch, start, length);
}
if (this.startPreferences) {
//Log.d(Constants.TAG, "chString: " + chString);
if (this.idChars) {
this.pref.setId(chString);
} else if (this.frequencyChars) {
this.pref.setFrequency(chString);
} else if (this.phoneNumberChars) {
this.pref.setPhoneNumber(chString);
} else if (this.serverAddressChars) {
this.pref.setServerAddress(chString);
} else if (this.serverPortChars) {
this.pref.setServerPort(chString);
} else if (this.prefAddressChars) {
this.pref.setPrefAddress(chString);
} else if (this.prefPortChars) {
this.pref.setPrefPort(chString);
}
}
}
public ArrayList<Preferences> getPreferences(){
Log.d(Constants.TAG, "prefs length: " + prefs.size());
return this.prefs;
}
public String getAttributeValue(String attName, Attributes atts){
String result = null;
for (int i = 0; i < atts.getLength(); i++){
String thisAtt = atts.getLocalName(i);
if (attName.equals(thisAtt)){
result = atts.getValue(i);
break;
}
}
return result;
}
}
如果我上運行模擬器或在HTC野火與2.2.1這個代碼，它工作得很好，我能保存在數據庫中的喜好。但是，當我在2.2版的三星Galaxy S上運行它時，我在readPreferences函數中返回null值。
這是2.2上的錯誤還是我做錯了什麼？
感謝你的幫助，