In my application I want to display RSS feed of a particular website. But I do not want it to display full Rss feed, I want only some particular tags to be searched and display and only its related links should display on screen.
here is my code of the Parser Class:-
package com.example.sara.rssfeed;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import android.util.Xml;
import com.example.sara.rssfeed.RssItem;
public class PcWorldRssParser {
// We don't use namespaces
private final String ns = null;
public List<RssItem> parse(InputStream inputStream) throws XmlPullParserException, IOException {
try {
XmlPullParser parser = Xml.newPullParser();
parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false);
parser.setInput(inputStream, null);
parser.nextTag();
return readFeed(parser);
} finally {
inputStream.close();
}
}
private List<RssItem> readFeed(XmlPullParser parser) throws XmlPullParserException, IOException {
parser.require(XmlPullParser.START_TAG, null, "rss");
String title = null;
String link = null;
List<RssItem> items = new ArrayList<RssItem>();
while (parser.next() != XmlPullParser.END_DOCUMENT) {
if (parser.getEventType() != XmlPullParser.START_TAG) {
continue;
}
String name = parser.getName();
if (name.equals("title")) {
title = readTitle(parser);}
else if (name.equals("link")) {
link = readLink(parser);}
if (title=="Top Stories - Google News" && link=="http://news.google.com/news?hl=en&ned=us") {
RssItem item = new RssItem(title, link);
items.add(item);
title = null;
link = null;
}
}
return items;
}
private String readLink(XmlPullParser parser) throws XmlPullParserException, IOException {
parser.require(XmlPullParser.START_TAG, ns, "link");
String link = readText(parser);
parser.require(XmlPullParser.END_TAG, ns, "link");
return link;
}
private String readTitle(XmlPullParser parser) throws XmlPullParserException, IOException {
parser.require(XmlPullParser.START_TAG, ns, "title");
String title = readText(parser);
parser.require(XmlPullParser.END_TAG, ns, "title");
return title;
}
// For the tags title and link, extract their text values.
private String readText(XmlPullParser parser) throws IOException, XmlPullParserException {
String result = "";
if (parser.next() == XmlPullParser.TEXT) {
result = parser.getText();
parser.nextTag();
}
return result;
}
}
Error:
on line if (title=="Top Stories - Google News" &&
link=="http://news.google.com/news?hl=en&ned=us")if I put
tittle!=nullandlink!=null`
it displays full rss feed. but If i give it particular link and title tag to search it displays nothing, only a blank screen.
Please help what am I doing wrong.
Thanks in Advance.
Related
I have a Problem with my android app. It always crashes, when I push the Button to go to the new Activity.
Error:
FATAL EXCEPTION: main
Process: PID: 15534
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.realliferpgadac.thomas.adacapp/com.realliferpgadac.thomas.adacapp.Feed}: java.lang.ClassCastException: android.widget.TextView cannot be cast to android.view.ViewGroup
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.ClassCastException: android.widget.TextView cannot be cast to android.view.ViewGroup
at android.app.BackStackRecord.configureTransitions(BackStackRecord.java:1244)
at android.app.BackStackRecord.beginTransition(BackStackRecord.java:978)
at android.app.BackStackRecord.run(BackStackRecord.java:707)
at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1535)
at android.app.FragmentController.execPendingActions(FragmentController.java:325)
at android.app.Activity.performStart(Activity.java:6252)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2379)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Source code of the activity that crashes: (It should be a RSS Feed)
import android.os.AsyncTask;
import android.os.Bundle;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.app.ListFragment;
import android.view.MenuItem;
import android.widget.ArrayAdapter;
import java.io.StringReader;
public class Feed extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_feed);
if (savedInstanceState == null) {
getFragmentManager().beginTransaction()
.add(R.id.tvFeed, new PlaceholderFragment())
.commit();
}
}
//#Override
// public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
//getMenuInflater().inflate(R.menu.main, menu);
//return true;
//}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.tvFeed) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends ListFragment {
// private TextView mRssFeed;
public PlaceholderFragment() {
}
// #Override
// public View onCreateView(LayoutInflater inflater, ViewGroup container,
// Bundle savedInstanceState) {
// View rootView = inflater.inflate(R.layout.fragment_main, container, false);
// mRssFeed = (TextView) rootView.findViewById(R.id.rss_feed);
// return rootView;
// }
#Override
public void onStart() {
super.onStart();
new GetAndroidPitRssFeedTask().execute();
}
private String getAndroidPitRssFeed() throws IOException {
InputStream in = null;
String rssFeed = null;
try {
URL url = new URL("http://www.androidpit.com/feed/main.xml");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
in = conn.getInputStream();
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
for (int count; (count = in.read(buffer)) != -1; ) {
out.write(buffer, 0, count);
}
byte[] response = out.toByteArray();
rssFeed = new String(response, "UTF-8");
} finally {
if (in != null) {
in.close();
}
}
return rssFeed;
}
private class GetAndroidPitRssFeedTask extends AsyncTask<Void, Void, List<String>> {
#Override
protected List<String> doInBackground(Void... voids) {
List<String> result = null;
try {
String feed = getAndroidPitRssFeed();
result = parse(feed);
} catch (XmlPullParserException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return result;
}
private List<String> parse(String rssFeed) throws XmlPullParserException, IOException {
XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
XmlPullParser xpp = factory.newPullParser();
xpp.setInput(new StringReader(rssFeed));
xpp.nextTag();
return readRss(xpp);
}
private List<String> readRss(XmlPullParser parser)
throws XmlPullParserException, IOException {
List<String> items = new ArrayList<>();
parser.require(XmlPullParser.START_TAG, null, "rss");
while (parser.next() != XmlPullParser.END_TAG) {
if (parser.getEventType() != XmlPullParser.START_TAG) {
continue;
}
String name = parser.getName();
if (name.equals("channel")) {
items.addAll(readChannel(parser));
} else {
skip(parser);
}
}
return items;
}
private List<String> readChannel(XmlPullParser parser)
throws IOException, XmlPullParserException {
List<String> items = new ArrayList<>();
parser.require(XmlPullParser.START_TAG, null, "channel");
while (parser.next() != XmlPullParser.END_TAG) {
if (parser.getEventType() != XmlPullParser.START_TAG) {
continue;
}
String name = parser.getName();
if (name.equals("item")) {
items.add(readItem(parser));
} else {
skip(parser);
}
}
return items;
}
private String readItem(XmlPullParser parser) throws XmlPullParserException, IOException {
String result = null;
parser.require(XmlPullParser.START_TAG, null, "item");
while (parser.next() != XmlPullParser.END_TAG) {
if (parser.getEventType() != XmlPullParser.START_TAG) {
continue;
}
String name = parser.getName();
if (name.equals("title")) {
result = readTitle(parser);
} else {
skip(parser);
}
}
return result;
}
// Processes title tags in the feed.
private String readTitle(XmlPullParser parser)
throws IOException, XmlPullParserException {
parser.require(XmlPullParser.START_TAG, null, "title");
String title = readText(parser);
parser.require(XmlPullParser.END_TAG, null, "title");
return title;
}
private String readText(XmlPullParser parser)
throws IOException, XmlPullParserException {
String result = "";
if (parser.next() == XmlPullParser.TEXT) {
result = parser.getText();
parser.nextTag();
}
return result;
}
private void skip(XmlPullParser parser) throws XmlPullParserException, IOException {
if (parser.getEventType() != XmlPullParser.START_TAG) {
throw new IllegalStateException();
}
int depth = 1;
while (depth != 0) {
switch (parser.next()) {
case XmlPullParser.END_TAG:
depth--;
break;
case XmlPullParser.START_TAG:
depth++;
break;
}
}
}
#Override
protected void onPostExecute(List<String> rssFeed) {
if (rssFeed != null) {
setListAdapter(new ArrayAdapter<>(
getActivity(),
android.R.layout.simple_list_item_1,
android.R.id.text1,
rssFeed));
}
}
}
}
}
XML file of the activity that crashes:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.realliferpgadac.thomas.adacapp.Feed">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Text"
android:id="#+id/tvFeed"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
</ScrollView>
</RelativeLayout>
Where is the problem and how can I solve it?
I hope you can help me.
Thank you,
emt
Replace R.id.tvFeed with Framelayout's id or default id android.R.id.content.
if (savedInstanceState == null) {
getFragmentManager().beginTransaction()
.add(android.R.id.content, new PlaceholderFragment())
.commit();
}
and remove the code from the onOptionsItemSelected() method.
if (id == R.id.tvFeed) {
return true;
}
I just wanted to know how to parse the following response of the server. I just wanted to get out the json from the xml. Because I know How to parse the json response So , some one please guide me how can I get this.
I have watched this link for xml parsing but I do not know how to specifically parse this (the underlying given response). the Response is as follows
<string xmlns="http://tempuri.org/">
[{"OSID":"2","PhoneVersion":"IPHONE5","PhoneOS":"IOS","ImageName":"t_3#2x.png","ImageID":"3"},{"OSID":"2","PhoneVersion":"IPHONE5","PhoneOS":"IOS","ImageName":"t_4#2x.png","ImageID":"4"},{"OSID":"2","PhoneVersion":"IPHONE5","PhoneOS":"IOS","ImageName":"t_5#2x.png","ImageID":"5"},{"OSID":"2","PhoneVersion":"IPHONE5","PhoneOS":"IOS","ImageName":"t_6#2x.png","ImageID":"6"},{"OSID":"2","PhoneVersion":"IPHONE5","PhoneOS":"IOS","ImageName":"t_7#2x.png","ImageID":"7"},{"OSID":"2","PhoneVersion":"IPHONE5","PhoneOS":"IOS","ImageName":"t_8#2x.png","ImageID":"8"},{"OSID":"2","PhoneVersion":"IPHONE5","PhoneOS":"IOS","ImageName":"t_9#2x.png","ImageID":"9"},{"OSID":"2","PhoneVersion":"IPHONE5","PhoneOS":"IOS","ImageName":"t_10#2x.png","ImageID":"10"},{"OSID":"2","PhoneVersion":"IPHONE5","PhoneOS":"IOS","ImageName":"t_11#2x.png","ImageID":"11"},{"OSID":"2","PhoneVersion":"IPHONE5","PhoneOS":"IOS","ImageName":"t_12#2x.png","ImageID":"12"}]
</string>
You can see that its in the
<string xmlns="http://tempuri.org/">
I just wanted to know how to parse this type of respne the rest of the response whcih is Json I can do parsing of json by my self. please just help me how to do it
This should work I haven't tested it yet
import android.util.Xml;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import java.io.IOException;
import java.io.InputStream;
public class StringXmlParser {
// your xml doesn't have any name spacing so make it null.
private static final String ns = null;
public String parse(InputStream in) throws XmlPullParserException, IOException {
try {
XmlPullParser parser = Xml.newPullParser();
parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false);
parser.setInput(in,null);
parser.nextTag();
return readString(parser);
} finally {
in.close();
}
}
private String readString(XmlPullParser parser) throws XmlPullParserException, IOException {
parser.require(XmlPullParser.START_TAG, ns, "string");
String jsonString = readText(parser);
parser.require(XmlPullParser.END_TAG, ns, "string");
return jsonString;
}
private String readText(XmlPullParser parser) throws IOException, XmlPullParserException {
String result = "";
if (parser.next() == XmlPullParser.TEXT) {
result = parser.getText();
parser.nextTag();
}
return result;
}
}
And this is how you use it
StringXmlParser xmlParser = new StringXmlParser();
String jsonString;
try {
// You need to get the input stream for the xml.
jsonString = xmlParser.parse(inputStream);
} finally {
if(inputStream != null) {
inputStream.close();
}
}
I'm trying to develop a simple application that reads rss feeds from a certain URL and then displays the results in a list view.
Here is my rss reader, which is the main thing in the app:
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserFactory;
public class RssReader {
private String title = null;
private String link = null;
private String description = null;
private ArrayList<RssItem> posts = new ArrayList<RssItem>();
private Thread thread;
private String urlString = null;
private XmlPullParserFactory xmlFactoryObject;
public volatile boolean parsingComplete = true;
public RssReader(String url) {
this.urlString = url;
}
public boolean getParsingComplete() {
return this.parsingComplete;
}
public ArrayList<RssItem> getPosts() {
return posts;
}
public void parseXML(XmlPullParser parser) {
int event;
try {
event = parser.getEventType();
while (event != XmlPullParser.END_DOCUMENT) {
String name = parser.getName();
switch (event) {
case XmlPullParser.START_TAG:
break;
case XmlPullParser.END_TAG:
if (name.equals("title")) {
title = parser.getText();
} else if (name.equals("link")) {
link = parser.getText();
} else if (name.equals("description")) {
description = parser.getText();
}
break;
}
if(title != null && link != null && description != null) {
RssItem item = new RssItem(this.title,this.description,this.link);
posts.add(item);
this.title = this.description = this.link = null;
}
event = parser.next();
}
parsingComplete = false;
} catch (Exception e) {
e.printStackTrace();
}
}
public void fetchXML() {
thread = new Thread(new Runnable() {
#Override
public void run() {
try {
URL url = new URL(urlString);
HttpURLConnection conn = (HttpURLConnection) url
.openConnection();
conn.setReadTimeout(10000 /* milliseconds */);
conn.setConnectTimeout(15000 /* milliseconds */);
conn.setRequestMethod("GET");
conn.setDoInput(true);
// Starts the query
conn.connect();
InputStream stream = conn.getInputStream();
xmlFactoryObject = XmlPullParserFactory.newInstance();
XmlPullParser myparser = xmlFactoryObject.newPullParser();
myparser.setFeature(
XmlPullParser.FEATURE_PROCESS_NAMESPACES, false);
myparser.setInput(stream, null);
parseXML(myparser);
stream.close();
} catch (Exception e) {
} finally {
parsingComplete = true;
}
}
});
thread.start();
}
And here is my MainActivity:
package com.example.ynetrssproject;
import java.util.ArrayList;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.widget.ListView;
import android.os.Bundle;
public class MainActivity extends ActionBarActivity {
private ListView news;
private String rssUrl = "http://www.themarker.com/cmlink/1.144";
private ArrayList<RssItem> list;
private RssItemAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
news = (ListView) findViewById(R.id.news);
RssReader reader = new RssReader(rssUrl);
reader.fetchXML();
while(true) {
Log.d("Runnning", "Run");
if(reader.getParsingComplete()) {
list = reader.getPosts();
break;
}
}
adapter = new RssItemAdapter(this, R.layout.post_item_list, list);
news.setAdapter(adapter);
}
}
The problem is that everytime I call fetchXML, eventually it returns me an empty ArrayList. Therefore, my listview keeps being empty.
My adapter isn't such a big deal. It works fine. The problem is that I keep getting an empty array list from the object RssReader. I know this because I performed a little if statement at the end of the code just to check if the ArrayList is empty.
P.S I have tried with multiple RSS urls but none of them works. Also, I added the permission of Internet in my manifest.
What's wrong with my code?
Your approach is a classic java approach. With android, you should use an IntentService or an AsyncTask that perform the RSS-fetch and then sends the read items to your activity.
http://developer.android.com/reference/android/app/IntentService.html
http://developer.android.com/reference/android/os/AsyncTask.html
Don't use while(true) to poll if the reader is ready.
Be aware that, when the user rotates the screen, onCreate is executed again.
I'm following the android xml parsing tutorial (http://developer.android.com/training/basics/network-ops/xml.html#analyze), however when stepping through it, it seems to fail at:
parser.require(XmlPullParser.START_TAG, ns, "rss");
and then ends up dropping to the finally clause. Just wondering if anyone could spot what the issue could be as I've played around with it for hours without much success.
The feed I am trying to read is: http://feeds.bbci.co.uk/news/rss.xml
Any help is greatly appreciated, please find the code below:
package com.proxama.news_bbc;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
import java.util.ArrayList;
import java.util.List;
import javax.xml.parsers.DocumentBuilder;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import android.support.v7.app.ActionBarActivity;
import android.support.v4.app.Fragment;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.util.Xml;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.provider.DocumentsContract.Document;
public class MainActivity extends ActionBarActivity {
private static final String ns = null;
/*
* Only interested in the content of the following XML tags for each news
* item:
*
* item/media:thumbnail item/pubDate item/link item/description item/title
*/
private void skip(XmlPullParser parser) throws XmlPullParserException,
IOException {
if (parser.getEventType() != XmlPullParser.START_TAG) {
throw new IllegalStateException();
}
int depth = 1;
while (depth != 0) {
switch (parser.next()) {
case XmlPullParser.END_TAG:
depth--;
break;
case XmlPullParser.START_TAG:
depth++;
break;
}
}
}
public static class Entry {
public final String title;
public final String link;
public final String summary;
private Entry(String title, String summary, String link) {
this.title = title;
this.summary = summary;
this.link = link;
}
}
// Parses the contents of an entry. If it encounters a title, summary, or
// link tag, hands them off
// to their respective "read" methods for processing. Otherwise, skips the
// tag.
// Processes title tags in the feed.
private String readTitle(XmlPullParser parser) throws IOException,
XmlPullParserException {
parser.require(XmlPullParser.START_TAG, ns, "title");
String title = readText(parser);
parser.require(XmlPullParser.END_TAG, ns, "title");
return title;
}
// Processes link tags in the feed.
private String readLink(XmlPullParser parser) throws IOException,
XmlPullParserException {
String link = "";
parser.require(XmlPullParser.START_TAG, ns, "link");
String tag = parser.getName();
String relType = parser.getAttributeValue(null, "rel");
if (tag.equals("link")) {
if (relType.equals("alternate")) {
link = parser.getAttributeValue(null, "href");
parser.nextTag();
}
}
parser.require(XmlPullParser.END_TAG, ns, "link");
return link;
}
// Processes summary tags in the feed.
private String readSummary(XmlPullParser parser) throws IOException,
XmlPullParserException {
parser.require(XmlPullParser.START_TAG, ns, "summary");
String summary = readText(parser);
parser.require(XmlPullParser.END_TAG, ns, "summary");
return summary;
}
// For the tags title and summary, extracts their text values.
private String readText(XmlPullParser parser) throws IOException,
XmlPullParserException {
String result = "";
if (parser.next() == XmlPullParser.TEXT) {
result = parser.getText();
parser.nextTag();
}
return result;
}
private Entry readEntry(XmlPullParser parser)
throws XmlPullParserException, IOException {
parser.require(XmlPullParser.START_TAG, ns, "item");
String title = null;
String summary = null;
String link = null;
while (parser.next() != XmlPullParser.END_TAG) {
if (parser.getEventType() != XmlPullParser.START_TAG) {
continue;
}
String name = parser.getName();
if (name.equals("title")) {
title = readTitle(parser);
} else if (name.equals("summary")) {
summary = readSummary(parser);
} else if (name.equals("link")) {
link = readLink(parser);
} else {
skip(parser);
}
}
return new Entry(title, summary, link);
}
private List readFeed(XmlPullParser parser) throws XmlPullParserException,
IOException {
List entries = new ArrayList();
String xmlContents = parser.toString();
parser.require(XmlPullParser.START_TAG, ns, "rss");
Log.d("className", "Up to here ");
while (parser.next() != XmlPullParser.END_TAG) {
if (parser.getEventType() != XmlPullParser.START_TAG) {
continue;
}
String name = parser.getName();
// Starts by looking for the news item tag
if (name.equals("item")) {
entries.add(readEntry(parser));
} else {
skip(parser);
}
}
return entries;
}
private List parseXml(InputStream in) throws XmlPullParserException,
IOException {
try {
XmlPullParser parser = Xml.newPullParser();
parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false);
parser.setInput(in, null);
return readFeed(parser);
} finally {
in.close();
}
}
private String downloadUrl(String myurl) throws IOException {
// TODO allow for internal storage if external is unavailable or full
File root = android.os.Environment.getExternalStorageDirectory();
String Directory = root.getAbsolutePath() + "/xmls";
String xmlFileName = "bbc_news_rss.xml";
String fullXmlPath = Directory + "/" + xmlFileName;
File dir = new File(Directory);
if (dir.exists() == false) {
dir.mkdirs();
}
/*URL url = new URL(myurl);
InputStream is = url.openStream();
OutputStream os = new FileOutputStream(fullXmlPath);
byte[] b = new byte[2048];
int length;
while ((length = is.read(b)) != -1) {
os.write(b, 0, length);
}
is.close();
os.close();*/
URL url = new URL(myurl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(10000 /* milliseconds */);
conn.setConnectTimeout(15000 /* milliseconds */);
conn.setRequestMethod("GET");
conn.setDoInput(true);
// Starts the query
conn.connect();
InputStream in = conn.getInputStream();
Log.d("className", "Saved XML file to: " + fullXmlPath);
Log.d("className", "Starting to parse XML file: " + fullXmlPath);
//InputStream in = new FileInputStream(fullXmlPath);
try {
parseXml(in);
} catch (XmlPullParserException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return fullXmlPath;
}
// Uses AsyncTask to create a task away from the main UI thread. This task
// takes a
// URL string and uses it to create an HttpUrlConnection. Once the
// connection
// has been established, the AsyncTask downloads the contents of the webpage
// as
// an InputStream. Finally, the InputStream is converted into a string,
// which is
// displayed in the UI by the AsyncTask's onPostExecute method.
private class DownloadWebpageTask extends AsyncTask<String, Void, String> {
#Override
protected String doInBackground(String... stringUrl) {
try {
Log.d("className", "Downloading url: " + stringUrl[0]);
return downloadUrl(stringUrl[0]);
} catch (IOException e) {
return "Unable to retrieve file.";
}
}
// onPostExecute displays the results of the AsyncTask.
#Override
protected void onPostExecute(String result) {
Log.d("className",
"In onpostexecute and result of downloadUrl is: " + result);
// If the file has been saved correctly, parse it.
if (result != "Unable to retrieve file.") {
Log.d("className", "Creating list view");
createList();
}
}
}
/** Pull in the XML from http://feeds.bbci.co.uk/news/rss.xml */
public void pull_xml(View view) {
ConnectivityManager connMgr = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
if (networkInfo != null && networkInfo.isConnected()) {
// can connect so fetch XML file
Log.d("className", "Successfully connected to network!");
new DownloadWebpageTask()
.execute("http://feeds.bbci.co.uk/news/rss.xml");
} else {
// display error
Log.d("className",
"Unable to connect to network, trying to use a previously saved local xml file");
}
}
public void createList() {
setContentView(R.layout.activity_main);
// Get ListView object from XML
ListView listView = (ListView) findViewById(R.id.listView1);
// Defined Array values to show in ListView
String[] values = new String[] { "Ukraine begins 'anti-terror' action" };
// Define a new Adapter
// First parameter - Context
// Second parameter - Layout for the row
// Third parameter - ID of the TextView to which the data is written
// Forth - the Array of data
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, android.R.id.text1, values);
// Assign adapter to ListView
listView.setAdapter(adapter);
}
// Original classes and methods that came by default with new android
// projects.
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// retrieve the XML and create list view
pull_xml(null);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
return rootView;
}
}
}
Your code has several mistakes:
DownloadWebpageTask.onPostExecute: here you are trying to compare Strings with != operator. It's wrong, you'll always get false. The correct way is to use equals method:
if ("Unable to retrieve file.".equals(result)) {
Log.d("className", "Creating list view");
createList();
}
createList() method: what's the purpose of calling setContentView(R.layout.activity_main); here if you already did it at the onCreate?
pull_xml(View view) method: what's the purpose of view argument? You are not using it at this method.
parseXml method: please add parser.nextTag()
Assume that I have file XML like this :
<?xml version="1.0"?>
<P>
<Content>
<id>1016576</id>
<date>20.08.2012</date>
<placeOfBirth>KUALA LUMPUR</placeOfBirth>
</Content>
<Content>
<id>1016620</id>
<date>20.08.2012</date>
<placeOfBirth>SINGAPORE</placeOfBirth>
</Content>
<Content>
<id>1020907</id>
<date>20.08.2012</date>
<placeOfBirth>SINGAPORE</placeOfBirth>
</Content>
</P>
I want to parse all the text and insert into database table which have _id, date and placeOfBirth column. I've tried this :
Activity activity1 = this;
String str="";
Resources res = activity1.getResources();
XmlResourceParser xmlPharser = res.getXml(R.xml.fileXML);
String id,date,pob;
//database
final databaseHelper myDbHelper = new databaseHelper(this);
myDbHelper.open();
//insert into table while parsing xml
try {
xmlPharser.next();
int eventType = xmlPharser.getEventType();
String event = ""+eventType;
Log.d("Event", event);
while (eventType != XmlPullParser.END_DOCUMENT)
{
if(eventType == XmlPullParser.START_TAG )
{
if( xmlPharser.getName() == "id")
{
id=xmlPharser.getText();
}
else if ( xmlPharser.getName() == "date" )
{
date = xmlPharser.getText();
}
else if ( xmlPharser.getName() == "placeOfBirth" )
{
pob = xmlPharser.getText();
}
myDbHelper.insertData(id,date,pob);
myDbHelper.close();
}
eventType = xmlPharser.next();
}
} catch (XmlPullParserException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
It doesn't get any error LogCat display, but it dosen't test the condition at each START_TAG.
How can I resolve this problem...
All answer would be appreciated..thanks
Parsing XML can get really nasty if you're not careful, specially with this parsers; you could try some other with simpler APIs or clearer ways of going through the hierarchy (ie. JDOM). You should also take a look at the examples at the Android developer's site, it's really straight forward (Parsing XML Data).
All that been said, I fixed it for you. This should work (at least it does for me). Be careful though, it doesn't have any error checking on malformed XML or database stuff.
import java.io.IOException;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import android.app.Activity;
import android.content.res.XmlResourceParser;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
public class MainActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
XmlResourceParser parser = getResources().getXml(R.xml.filexml);
final databaseHelper myDbHelper = null;
try {
myDbHelper = new databaseHelper(this);
myDbHelper.open();
while (parser.next() != XmlPullParser.END_TAG) {
if (parser.getEventType() != XmlPullParser.START_TAG) {
continue;
}
String name = parser.getName();
if (name.equals("Content")) {
String id = null, date = null, pob = null;
while (parser.next() != XmlPullParser.END_TAG) {
if (parser.getEventType() != XmlPullParser.START_TAG) {
continue;
}
name = parser.getName();
if (name.equals("id")) {
id = readText(parser);
} else if (name.equals("date")) {
date = readText(parser);
} else if (name.equals("placeOfBirth")) {
pob = readText(parser);
}
}
myDbHelper.insertData(id,date,pob);
}
}
} catch (XmlPullParserException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if (myDbHelper != null) {
myDbHelper.close();
}
}
}
private String readText(XmlPullParser parser) throws IOException,
XmlPullParserException {
String result = "";
if (parser.next() == XmlPullParser.TEXT) {
result = parser.getText();
parser.nextTag();
}
return result;
}
One more comment, change the xml file name to lowercase ;)