xml - Android - Multilevel Listviews -
i relatively new android , working online api. have 2 activities. first activity bringing list of search results , placing them listview. not problem. trying select item listview , pass next activity , fill listview in new activity information selected item. problem is. second activity never loads. way second activity work? have been doing research , not getting desired results. code 2 activities , helper class below. thank you
the first activity
import helper.artistcalendarhelper; import java.util.arraylist; import java.util.hashmap; import java.util.list; import org.w3c.dom.document; import org.w3c.dom.element; import org.w3c.dom.nodelist; import services.xmlparser; import android.app.listactivity; import android.app.progressdialog; import android.content.intent; import android.os.asynctask; import android.os.bundle; import android.util.log; import android.view.view; import android.widget.adapterview; import android.widget.listadapter; import android.widget.listview; import android.widget.simpleadapter; import android.widget.textview; import android.widget.adapterview.onitemclicklistener; public class artistssearchactivity extends listactivity { public static final string tag = "artistssearchactivity"; public static final string intent_extras_xml = "xml"; static final string key_artists = "artist"; static final string key_id = "id"; static final string key_display_name = "displayname"; static final string key_uri = "uri"; static final string key_on_tour_until = "ontouruntil"; string ontouruntil ; string displayname; string identification; @override public void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_artists_search); string xml = getintent().getstringextra(homeactivity.intent_extras_xml); list<hashmap<string, string>> menuitems = new arraylist<hashmap<string, string>>(); addartiststohashmap(menuitems, xml); additemstolist(menuitems); } private void additemstolist(list<hashmap<string, string>> menuitems) { listadapter adapter = new simpleadapter(this, menuitems, r.layout.list_item_artist_search, new string[] { key_id, key_display_name, key_uri, key_on_tour_until }, new int[] { r.id.tvid, r.id.tvdisplayname, r.id.tvuri, r.id.tvontouruntil }); setlistadapter(adapter); } private void addartiststohashmap(list<hashmap<string, string>> menuitems, string xml) { xmlparser parser = new xmlparser(); document doc = parser.getdomelement(xml); nodelist nl = doc.getelementsbytagname(key_artists); (int = 0; < nl.getlength(); i++) { hashmap<string, string> map = new hashmap<string, string>(); element e = (element) nl.item(i); map.put(key_id, e.getattribute(key_id)); map.put(key_display_name, e.getattribute(key_display_name)); map.put(key_uri, e.getattribute(key_uri)); map.put(key_on_tour_until, e.getattribute(key_on_tour_until)); menuitems.add(map); } // selecting single listview item listview lv = getlistview(); lv.setonitemclicklistener(new onitemclicklistener() { @override public void onitemclick(adapterview<?> parent, view view, int position, long id) { // getting values selected listitem displayname = ((textview) view.findviewbyid(r.id.tvdisplayname)).gettext().tostring(); ontouruntil = ((textview) view.findviewbyid(r.id.tvontouruntil)).gettext().tostring(); identification = ((textview) view.findviewbyid(r.id.tvid)).gettext().tostring(); new asyncdownload().execute(identification); } }); } private class asyncdownload extends asynctask<string, string, string> { progressdialog pdialog; @override protected void onpreexecute() { super.onpreexecute(); pdialog = new progressdialog(artistssearchactivity.this); pdialog.setmessage("please wait..."); pdialog.setcancelable(false); pdialog.show(); } @override protected string doinbackground(string... params) { log.v(tag, "query is" + params[0]); string result = new artistcalendarhelper().getxml(params[0]); return result; } @override protected void oncancelled() { super.oncancelled(); pdialog.dismiss(); } @override protected void onpostexecute(string result) { super.onpostexecute(result); pdialog.dismiss(); log.v(tag, "result=" + result); intent intent = new intent(); intent.setclass(artistssearchactivity.this, singleartistactivity.class); intent.putextra(key_display_name, displayname); intent.putextra(key_id, identification); intent.putextra(key_on_tour_until, ontouruntil); intent.putextra(intent_extras_xml, result); startactivity(intent); } } } the second activity
import java.util.arraylist; import java.util.hashmap; import java.util.list; import org.w3c.dom.document; import org.w3c.dom.element; import org.w3c.dom.nodelist; import services.xmlparser; import android.os.bundle; import android.app.activity; import android.app.listactivity; import android.content.intent; import android.widget.listadapter; import android.widget.simpleadapter; import android.widget.textview; public class singleartistactivity extends listactivity { public static final string tag = "singleartistactivity"; public static final string intent_extras_xml = "xml"; static final string key_venue = "event"; static final string key_venue_name = "displayname"; static final string key_display_name = "displayname"; static final string key_on_tour_until = "ontouruntil"; static final string key_id = "id"; @override public void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_single_artist); // getting intent data intent in = getintent(); // xml values previous intent string displayname = in.getstringextra(key_display_name); string ontouruntil = in.getstringextra(key_on_tour_until); string id = in.getstringextra(key_id); // displaying values on screen textview lbldisplayname = (textview) findviewbyid(r.id.display_name_label); textview lblontouruntil = (textview) findviewbyid(r.id.on_tour_until_label); textview lblid = (textview) findviewbyid(r.id.id_label); lbldisplayname.settext(displayname); lblontouruntil.settext(ontouruntil); lblid.settext(id); string xml = getintent().getstringextra(homeactivity.intent_extras_xml); list<hashmap<string, string>> menuitems = new arraylist<hashmap<string, string>>(); additemstolist(menuitems); addcalendartohashmap(menuitems, xml); } private void additemstolist(list<hashmap<string, string>> menuitems) { listadapter adapter = new simpleadapter(this, menuitems, r.layout.list_item_artist_calendar, new string[] { key_venue_name }, new int[] { r.id.calendardisplayname }); setlistadapter(adapter); } private void addcalendartohashmap(list<hashmap<string, string>> menuitems, string xml) { xmlparser parser = new xmlparser(); document doc = parser.getdomelement(xml); nodelist nl = doc.getelementsbytagname(key_venue); (int = 0; < nl.getlength(); i++) { hashmap<string, string> map = new hashmap<string, string>(); element e = (element) nl.item(i); map.put(key_venue_name, e.getattribute(key_venue_name)); menuitems.add(map); } } } and helper class
import java.io.bufferedreader; import java.io.ioexception; import java.io.inputstream; import java.io.inputstreamreader; import java.io.unsupportedencodingexception; import java.net.urlencoder; import org.apache.http.httpentity; import org.apache.http.httpresponse; import org.apache.http.client.httpclient; import org.apache.http.client.methods.httpget; import org.apache.http.impl.client.defaulthttpclient; import android.util.log; public class locationcalendarhelper { private static final string tag = "locationcalendarhelper"; private static final string songkick_url = "http://api.songkick.com/api/3.0/metro_areas/"; private static final string api_key = "yiekmi1hqzcfhekc"; public string getxml(string searchquery) { httpclient httpclient = new defaulthttpclient(); string getparameters = ""; try { getparameters = urlencoder.encode(searchquery, "utf-8") + "/calendar.xml?apikey=" + urlencoder.encode(api_key, "utf-8"); } catch (unsupportedencodingexception e1) { // todo auto-generated catch block e1.printstacktrace(); } string url = songkick_url + getparameters; // prepare request object httpget httpget = new httpget(url); // execute request httpresponse response; try { response = httpclient.execute(httpget); // examine response status log.i(tag, response.getstatusline().tostring()); // hold of response entity httpentity entity = response.getentity(); // if response not enclose entity, there no need // worry connection release if (entity != null) { // simple json response read inputstream instream = entity.getcontent(); string result = convertstreamtostring(instream); // have string representation of html request instream.close(); return result; } } catch (exception e) { e.printstacktrace(); return null; } return null; } private static string convertstreamtostring(inputstream is) { bufferedreader reader = new bufferedreader(new inputstreamreader(is)); stringbuilder sb = new stringbuilder(); string line = null; try { while ((line = reader.readline()) != null) { sb.append(line + "\n"); } } catch (ioexception e) { e.printstacktrace(); } { try { is.close(); } catch (ioexception e) { e.printstacktrace(); } } return sb.tostring(); } } my log cat errors. starts bunch of xml activity pulling in information ends error
05-10 07:09:41.587: v/artistssearchactivity(796): <identifier mbid="eb558587-e7a1-4f2b-9fda-b6ff5e137ed1" href="http://api.songkick.com/api/3.0/artists/mbid:eb558587-e7a1-4f2b-9fda-b6ff5e137ed1.xml"/> 05-10 07:09:41.587: v/artistssearchactivity(796): </artist> 05-10 07:09:41.587: v/artistssearchactivity(796): </performance> 05-10 07:09:41.587: v/artistssearchactivity(796): <performance billingindex="3" displayname="love , death" billing="support" id="32720419"> 05-10 07:09:41.587: v/artistssearchactivity(796): <artist displayname="love , death" uri="http://www.songkick.com/artists/286472-love-and-death?utm_source=19089&utm_medium=partner" id="286472"> 05-10 07:09:41.587: v/artistssearchactivity(796): <identifier mbid="27796970-8f7a-4196-9f7d-87f091af4412" href="http://api.songkick.com/api/3.0/artists/mbid:27796970-8f7a-4196-9f7d-87f091af4412.xml"/> 05-10 07:09:41.587: v/artistssearchactivity(796): <identifier mbid="c29b667e-9895-41d2-b5a5-1817050ce0bc" href="http://api.songkick.com/api/3.0/artists/mbid:c29b667e-9895-41d2-b5a5-1817050ce0bc.xml"/> 05-10 07:09:41.587: v/artistssearchactivity(796): </artist> 05-10 07:09:41.587: v/artistssearchactivity(796): </performance> 05-10 07:09:41.587: v/artistssearchactivity(796): <venue displayname="rostraver ice garden arena" lat="40.1981235" lng="-79.8294916" uri="http://www.songkick.com/venues/51599-rostraver-ice-garden-arena?utm_source=19089&utm_medium=partner" id="51599"> 05-10 07:09:41.587: v/artistssearchactivity(796): <metroarea displayname="belle vernon" uri="http://www.songkick.com/metro_areas/56020-us-belle-vernon?utm_source=19089&utm_medium=partner" id="56020"> 05-10 07:09:41.587: v/artistssearchactivity(796): <state displayname="pa"/> 05-10 07:09:41.587: v/artistssearchactivity(796): <country displayname="us"/> 05-10 07:09:41.587: v/artistssearchactivity(796): </metroarea> 05-10 07:09:41.587: v/artistssearchactivity(796): </venue> 05-10 07:09:41.587: v/artistssearchactivity(796): <start time="19:30:00" datetime="2013-05-15t19:30:00-0500" date="2013-05-15"/> 05-10 07:09:41.587: v/artistssearchactivity(796): <location lat="40.1981235" lng="-79.8294916" city="belle vernon, pa, us"/> 05-10 07:09:41.587: v/artistssearchactivity(796): </event> 05-10 07:09:41.587: v/artistssearchactivity(796): <event type="festival" status="ok" displayname="rock on range 2013" uri="http://www.songkick.com/festivals/8261/id/14745014-rock-on-the-range-2013?utm_source=19089&utm_medium=partner" popularity="0 05-10 07:09:41.637: i/choreographer(796): skipped 49 frames! application may doing work on main thread. 05-10 07:09:43.807: e/trace(871): error opening trace file: no such file or directory (2) 05-10 07:09:45.357: e/trace(910): error opening trace file: no such file or directory (2) 05-10 07:09:45.687: e/trace(923): error opening trace file: no such file or directory (2) 05-10 07:09:46.307: e/trace(936): error opening trace file: no such file or directory (2) 05-10 07:09:47.167: e/trace(949): error opening trace file: no such file or directory (2) 05-10 07:09:48.337: e/trace(975): error opening trace file: no such file or directory (2) i have update. above code works! leave need it. problem having if xml string long search times out. how give android more time search?
private void additemstolist(list<hashmap<string, string>> menuitems) { listadapter adapter = new simpleadapter(this, menuitems, r.layout.list_item_artist_calendar, new string[] { key_venue_name }, new int[] { r.id.calendardisplayname }); setlistadapter(adapter); adapter.notifydatasetchanged(); } 
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