我只想解析本地 XML 文件。当我将 XML 文件放在我的资源文件夹中时，代码可以正常工作。这是我的代码。
try {
XmlResourceParser xpp = getResources().getXml(R.xml.catalog);
xpp.next();
int eventType = xpp.getEventType();
int iter = 0;
String elemtext = null;
while (eventType != XmlPullParser.END_DOCUMENT) {
if (eventType == XmlPullParser.START_TAG) {
String elemName = xpp.getName();
if (elemName.equals("catalog")) {
String journalAttr = xpp.getAttributeValue(null,
"journal");
String publisherAttr = xpp.getAttributeValue(null,
"publisher");
journal.setText(journalAttr);
publisher.setText(publisherAttr);
}
if (elemName.equals("article")) {
iter = iter + 1;
}
if (elemName.equals("edition")) {
elemtext = "edition";
}
if (elemName.equals("title")) {
elemtext = "title";
}
if (elemName.equals("author")) {
elemtext = "author";
}
}
else if (eventType == XmlPullParser.TEXT) {
if (iter == 1) {
if (elemtext.equals("edition")) {
edition1.setText(xpp.getText());
} else if (elemtext.equals("title")) {
title1.setText(xpp.getText());
} else if (elemtext.equals("author")) {
author1.setText(xpp.getText());
}
}
else if (iter == 2) {
if (elemtext.equals("edition")) {
edition2.setText(xpp.getText());
} else if (elemtext.equals("title")) {
title2.setText(xpp.getText());
} else if (elemtext.equals("author")) {
author2.setText(xpp.getText());
}
}
}
eventType = xpp.next();
}
} catch (XmlPullParserException e) {
} catch (IOException e) {
}
现在我的 Intent 是让代码在 sdcard 中放置相同文件的情况下工作。 这是我的努力。
try {
XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
factory.setNamespaceAware(true);
XmlPullParser xpp = factory.newPullParser();
int eventType = xpp.getEventType();
int iter = 0;
String elemtext = null;
// get a reference to the file.
File file = new File(Environment.getExternalStorageDirectory()
+ "/newdir/catalog.xml");
FileInputStream fis = new FileInputStream(file);
xpp.setInput(new InputStreamReader(fis));
while (eventType != XmlPullParser.END_DOCUMENT) {
if (eventType == XmlPullParser.START_TAG) {
String elemName = xpp.getName();
if (elemName.equals("catalog")) {
String journalAttr = xpp.getAttributeValue(null,
"journal");
String publisherAttr = xpp.getAttributeValue(null,
"publisher");
journal.setText(journalAttr);
publisher.setText(publisherAttr);
}
if (elemName.equals("article")) {
iter = iter + 1;
}
if (elemName.equals("edition")) {
elemtext = "edition";
}
if (elemName.equals("title")) {
elemtext = "title";
}
if (elemName.equals("author")) {
elemtext = "author";
}
}
else if (eventType == XmlPullParser.TEXT) {
if (iter == 1) {
if (elemtext.equals("edition")) {
edition1.setText(xpp.getText());
} else if (elemtext.equals("title")) {
title1.setText(xpp.getText());
} else if (elemtext.equals("author")) {
author1.setText(xpp.getText());
}
}
else if (iter == 2) {
if (elemtext.equals("edition")) {
edition2.setText(xpp.getText());
} else if (elemtext.equals("title")) {
title2.setText(xpp.getText());
} else if (elemtext.equals("author")) {
author2.setText(xpp.getText());
}
}
}
eventType = xpp.next();
}
} catch (XmlPullParserException e) {
} catch (IOException e) {
}
当我使用这段代码时，我得到了空指针异常。帮我解决这个问题。
最佳答案
关于android - 解析 sdcard 中的 XML 文件 - 出现空指针异常，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/11407566/