发布于 2016-02-23 04:26:46 | 95 次阅读 | 评论: 0 | 来源: 网友投递
Android移动端操作系统
Android是一种基于Linux的自由及开放源代码的操作系统,主要使用于移动设备,如智能手机和平板电脑,由Google公司和开放手机联盟领导及开发。尚未有统一中文名称,中国大陆地区较多人使用“安卓”或“安致”。
org.xmlpull.v1.XmlPullParser;
org.xmlpull.v1.XmlPullParserFactory;
final XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
factory.setNamespaceAware(true);
final XmlPullParser parser = factory.newPullParser();
parser.setInput(new StringReader("<author country=\"United States\">James Elliott</author>");
<author>James Elliott</author>
<author></author>
<author/>
<title>What Is Hibernate</title>
<author>James Elliott</author>
<category>Web</category>
while (eventType != XmlPullParser.END_TAG) {
switch (eventType) {
case XmlPullParser.START_TAG:
tag = parser.getName();
final String content = parser.nextText();
Log.e(TAG, tag + ": [" + content + "]");
eventType = parser.nextTag();
break;
default:
break;
}
}
import java.io.IOException;
import java.io.InputStream;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;
import android.util.Log;
public class RssPullParser extends RssParser {
private final String TAG = FeedSettings.GLOBAL_TAG;
private InputStream mInputStream;
public RssPullParser(InputStream is) {
mInputStream = is;
}
public void parse() throws ReaderBaseException, XmlPullParserException, IOException {
if (mInputStream == null) {
throw new ReaderBaseException("no input source, did you initialize this class correctly?");
}
final XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
factory.setNamespaceAware(true);
final XmlPullParser parser = factory.newPullParser();
parser.setInput(mInputStream);
int eventType = parser.getEventType();
if (eventType != XmlPullParser.START_DOCUMENT) {
throw new ReaderBaseException("Not starting with 'start_document'");
}
eventType = parseRss(parser);
if (eventType != XmlPullParser.END_DOCUMENT) {
throw new ReaderBaseException("not ending with 'end_document', do you finish parsing?");
}
if (mInputStream != null) {
mInputStream.close();
} else {
Log.e(TAG, "inputstream is null, XmlPullParser closed it??");
}
}
/**
* Parsing the Xml document. Current type must be Start_Document.
* After calling this, Parser is positioned at END_DOCUMENT.
* @param parser
* @return event end_document
* @throws XmlPullParserException
* @throws ReaderBaseException
* @throws IOException
*/
private int parseRss(XmlPullParser parser) throws XmlPullParserException, ReaderBaseException, IOException {
int eventType = parser.getEventType();
if (eventType != XmlPullParser.START_DOCUMENT) {
throw new ReaderBaseException("not starting with 'start_document', is this a new document?");
}
Log.e(TAG, "starting document, are you aware of that!");
eventType = parser.next();
while (eventType != XmlPullParser.END_DOCUMENT) {
switch (eventType) {
case XmlPullParser.START_TAG: {
Log.e(TAG, "start tag: '" + parser.getName() + "'");
final String tagName = parser.getName();
if (tagName.equals(RssFeed.TAG_RSS)) {
Log.e(TAG, "starting an RSS feed <<");
final int attrSize = parser.getAttributeCount();
for (int i = 0; i < attrSize; i++) {
Log.e(TAG, "attr '" + parser.getAttributeName(i) + "=" + parser.getAttributeValue(i) + "'");
}
} else if (tagName.equals(RssFeed.TAG_CHANNEL)) {
Log.e(TAG, "\tstarting an Channel <<");
parseChannel(parser);
}
break;
}
case XmlPullParser.END_TAG: {
Log.e(TAG, "end tag: '" + parser.getName() + "'");
final String tagName = parser.getName();
if (tagName.equals(RssFeed.TAG_RSS)) {
Log.e(TAG, ">> edning an RSS feed");
} else if (tagName.equals(RssFeed.TAG_CHANNEL)) {
Log.e(TAG, "\t>> ending an Channel");
}
break;
}
default:
break;
}
eventType = parser.next();
}
Log.e(TAG, "end of document, it is over");
return parser.getEventType();
}
/**
* Parse a channel. MUST be start tag of an channel, otherwise exception thrown.
* Param XmlPullParser
* After calling this function, parser is positioned at END_TAG of Channel.
* return end tag of a channel
* @throws XmlPullParserException
* @throws ReaderBaseException
* @throws IOException
*/
private int parseChannel(XmlPullParser parser) throws XmlPullParserException, ReaderBaseException, IOException {
int eventType = parser.getEventType();
String tagName = parser.getName();
if (eventType != XmlPullParser.START_TAG || !RssFeed.TAG_CHANNEL.equals(tagName)) {
throw new ReaderBaseException("not start with 'start tag', is this a start of a channel?");
}
Log.e(TAG, "\tstarting " + tagName);
eventType = parser.nextTag();
while (eventType != XmlPullParser.END_TAG) {
switch (eventType) {
case XmlPullParser.START_TAG: {
final String tag = parser.getName();
if (tag.equals(RssFeed.TAG_IMAGE)) {
parseImage(parser);
} else if (tag.equals(RssFeed.TAG_ITEM)) {
parseItem(parser);
} else {
final String content = parser.nextText();
Log.e(TAG, tag + ": [" + content + "]");
}
// now it SHOULD be at END_TAG, ensure it
if (parser.getEventType() != XmlPullParser.END_TAG) {
throw new ReaderBaseException("not ending with 'end tag', did you finish parsing sub item?");
}
eventType = parser.nextTag();
break;
}
default:
break;
}
}
Log.e(TAG, "\tending " + parser.getName());
return parser.getEventType();
}
/**
* Parse image in a channel.
* Precondition: position must be at START_TAG and tag MUST be 'image'
* Postcondition: position is END_TAG of '/image'
* @throws IOException
* @throws XmlPullParserException
* @throws ReaderBaseException
*/
private int parseImage(XmlPullParser parser) throws XmlPullParserException, IOException, ReaderBaseException {
int eventType = parser.getEventType();
String tag = parser.getName();
if (eventType != XmlPullParser.START_TAG || !RssFeed.TAG_IMAGE.equals(tag)) {
throw new ReaderBaseException("not start with 'start tag', is this a start of an image?");
}
Log.e(TAG, "\t\tstarting image " + tag);
eventType = parser.nextTag();
while (eventType != XmlPullParser.END_TAG) {
switch (eventType) {
case XmlPullParser.START_TAG:
tag = parser.getName();
Log.e(TAG, tag + ": [" + parser.nextText() + "]");
// now it SHOULD be at END_TAG, ensure it
if (parser.getEventType() != XmlPullParser.END_TAG) {
throw new ReaderBaseException("not ending with 'end tag', did you finish parsing sub item?");
}
eventType = parser.nextTag();
break;
default:
break;
}
}
Log.e(TAG, "\t\tending image " + parser.getName());
return parser.getEventType();
}
/**
* Parse an item in a channel.
* Precondition: position must be at START_TAG and tag MUST be 'item'
* Postcondition: position is END_TAG of '/item'
* @throws IOException
* @throws XmlPullParserException
* @throws ReaderBaseException
*/
private int parseItem(XmlPullParser parser) throws XmlPullParserException, IOException, ReaderBaseException {
int eventType = parser.getEventType();
String tag = parser.getName();
if (eventType != XmlPullParser.START_TAG || !RssFeed.TAG_ITEM.equals(tag)) {
throw new ReaderBaseException("not start with 'start tag', is this a start of an item?");
}
Log.e(TAG, "\t\tstarting " + tag);
eventType = parser.nextTag();
while (eventType != XmlPullParser.END_TAG) {
switch (eventType) {
case XmlPullParser.START_TAG:
tag = parser.getName();
final String content = parser.nextText();
Log.e(TAG, tag + ": [" + content + "]");
// now it SHOULD be at END_TAG, ensure it
if (parser.getEventType() != XmlPullParser.END_TAG) {
throw new ReaderBaseException("not ending with 'end tag', did you finish parsing sub item?");
}
eventType = parser.nextTag();
break;
default:
break;
}
}
Log.e(TAG, "\t\tending " + parser.getName());
return parser.getEventType();
}
}