Android JSON Parsing not working -
i'm using androidhive tutorials data json file , view list or grid. when run application, app crashes , exits. couldn't find error on code. can download source code above tutorial link. provided class files here. please me solve problem possible. in advanced.
androidjsonparsingactivity.java
package com.example.samplejsonparsing; import java.util.arraylist; import java.util.hashmap; import org.json.jsonarray; import org.json.jsonexception; import org.json.jsonobject; import android.app.listactivity; import android.content.intent; import android.os.bundle; import android.util.log; import android.view.view; import android.widget.adapterview; import android.widget.adapterview.onitemclicklistener; import android.widget.listadapter; import android.widget.listview; import android.widget.simpleadapter; import android.widget.textview; public class androidjsonparsingactivity extends listactivity { // url make request private static string url = "http://api.androidhive.info/contacts/"; // json node names private static final string tag_contacts = "contacts"; private static final string tag_id = "id"; private static final string tag_name = "name"; private static final string tag_email = "email"; private static final string tag_address = "address"; private static final string tag_gender = "gender"; private static final string tag_phone = "phone"; private static final string tag_phone_mobile = "mobile"; private static final string tag_phone_home = "home"; private static final string tag_phone_office = "office"; // contacts jsonarray jsonarray contacts = null; @override public void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.main); // hashmap listview arraylist<hashmap<string, string>> contactlist = new arraylist<hashmap<string, string>>(); // creating json parser instance jsonparser jparser = new jsonparser(); // getting json string url jsonobject json = jparser.getjsonfromurl(url); try { // getting array of contacts contacts = json.getjsonarray(tag_contacts); // looping through contacts for(int = 0; < contacts.length(); i++){ jsonobject c = contacts.getjsonobject(i); // storing each json item in variable string id = c.getstring(tag_id); string name = c.getstring(tag_name); string email = c.getstring(tag_email); string address = c.getstring(tag_address); string gender = c.getstring(tag_gender); // phone number agin json object jsonobject phone = c.getjsonobject(tag_phone); string mobile = phone.getstring(tag_phone_mobile); string home = phone.getstring(tag_phone_home); string office = phone.getstring(tag_phone_office); // creating new hashmap hashmap<string, string> map = new hashmap<string, string>(); // adding each child node hashmap key => value map.put(tag_id, id); map.put(tag_name, name); map.put(tag_email, email); map.put(tag_phone_mobile, mobile); // adding hashlist arraylist contactlist.add(map); } } catch (jsonexception e) { e.printstacktrace(); } /** * updating parsed json data listview * */ listadapter adapter = new simpleadapter(this, contactlist, r.layout.list_item, new string[] { tag_name, tag_email, tag_phone_mobile }, new int[] { r.id.name, r.id.email, r.id.mobile }); setlistadapter(adapter); // selecting single listview item listview lv = getlistview(); // launching new screen on selecting single listitem lv.setonitemclicklistener(new onitemclicklistener() { @override public void onitemclick(adapterview<?> parent, view view, int position, long id) { // getting values selected listitem string name = ((textview) view.findviewbyid(r.id.name)).gettext().tostring(); string cost = ((textview) view.findviewbyid(r.id.email)).gettext().tostring(); string description = ((textview) view.findviewbyid(r.id.mobile)).gettext().tostring(); // starting new intent intent in = new intent(getapplicationcontext(), singlemenuitemactivity.class); in.putextra(tag_name, name); in.putextra(tag_email, cost); in.putextra(tag_phone_mobile, description); startactivity(in); } }); } } jsonparser.java
package com.example.samplejsonparsing; import java.io.bufferedreader; import java.io.ioexception; import java.io.inputstream; import java.io.inputstreamreader; import java.io.unsupportedencodingexception; import org.apache.http.httpentity; import org.apache.http.httpresponse; import org.apache.http.client.clientprotocolexception; import org.apache.http.client.methods.httppost; import org.apache.http.impl.client.defaulthttpclient; import org.json.jsonexception; import org.json.jsonobject; import android.util.log; public class jsonparser { static inputstream = null; static jsonobject jobj = null; static string json = ""; // constructor public jsonparser() { } public jsonobject getjsonfromurl(string url) { // making http request try { // defaulthttpclient defaulthttpclient httpclient = new defaulthttpclient(); httppost httppost = new httppost(url); httpresponse httpresponse = httpclient.execute(httppost); httpentity httpentity = httpresponse.getentity(); = httpentity.getcontent(); } catch (unsupportedencodingexception e) { e.printstacktrace(); } catch (clientprotocolexception e) { e.printstacktrace(); } catch (ioexception e) { e.printstacktrace(); } try { bufferedreader reader = new bufferedreader(new inputstreamreader( is, "iso-8859-1"), 8); stringbuilder sb = new stringbuilder(); string line = null; while ((line = reader.readline()) != null) { sb.append(line + "\n"); } is.close(); json = sb.tostring(); } catch (exception e) { log.e("buffer error", "error converting result " + e.tostring()); } // try parse string json object try { jobj = new jsonobject(json); } catch (jsonexception e) { log.e("json parser", "error parsing data " + e.tostring()); } // return json string return jobj; } } singlemenuitemactivity.java
package com.example.samplejsonparsing; import android.app.activity; import android.content.intent; import android.os.bundle; import android.widget.textview; public class singlemenuitemactivity extends activity { // json node keys private static final string tag_name = "name"; private static final string tag_email = "email"; private static final string tag_phone_mobile = "mobile"; @override public void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.single_list_item); // getting intent data intent in = getintent(); // json values previous intent string name = in.getstringextra(tag_name); string cost = in.getstringextra(tag_email); string description = in.getstringextra(tag_phone_mobile); // displaying values on screen textview lblname = (textview) findviewbyid(r.id.name_label); textview lblcost = (textview) findviewbyid(r.id.email_label); textview lbldesc = (textview) findviewbyid(r.id.mobile_label); lblname.settext(name); lblcost.settext(cost); lbldesc.settext(description); } } maybe can silly question please don't ignore this.
08-08 10:18:50.240: d/abslistview(14239): motionrecognitionmanager 08-08 10:18:50.285: d/androidruntime(14239): shutting down vm 08-08 10:18:50.285: w/dalvikvm(14239): threadid=1: thread exiting uncaught exception (group=0x40ee32a0) 08-08 10:18:50.295: e/androidruntime(14239): fatal exception: main 08-08 10:18:50.295: e/androidruntime(14239): java.lang.runtimeexception: unable start activity componentinfo{com.example.samplejsonparsing/com.example.samplejsonparsing.androidjsonparsingactivity}: android.os.networkonmainthreadexception 08-08 10:18:50.295: e/androidruntime(14239): @ android.app.activitythread.performlaunchactivity(activitythread.java:2100) 08-08 10:18:50.295: e/androidruntime(14239): @ android.app.activitythread.handlelaunchactivity(activitythread.java:2125) 08-08 10:18:50.295: e/androidruntime(14239): @ android.app.activitythread.access$600(activitythread.java:140) 08-08 10:18:50.295: e/androidruntime(14239): @ android.app.activitythread$h.handlemessage(activitythread.java:1227) 08-08 10:18:50.295: e/androidruntime(14239): @ android.os.handler.dispatchmessage(handler.java:99) 08-08 10:18:50.295: e/androidruntime(14239): @ android.os.looper.loop(looper.java:137) 08-08 10:18:50.295: e/androidruntime(14239): @ android.app.activitythread.main(activitythread.java:4898) 08-08 10:18:50.295: e/androidruntime(14239): @ java.lang.reflect.method.invokenative(native method) 08-08 10:18:50.295: e/androidruntime(14239): @ java.lang.reflect.method.invoke(method.java:511) 08-08 10:18:50.295: e/androidruntime(14239): @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:1006) 08-08 10:18:50.295: e/androidruntime(14239): @ com.android.internal.os.zygoteinit.main(zygoteinit.java:773) 08-08 10:18:50.295: e/androidruntime(14239): @ dalvik.system.nativestart.main(native method) 08-08 10:18:50.295: e/androidruntime(14239): caused by: android.os.networkonmainthreadexception 08-08 10:18:50.295: e/androidruntime(14239): @ android.os.strictmode$androidblockguardpolicy.onnetwork(strictmode.java:1118) 08-08 10:18:50.295: e/androidruntime(14239): @ java.net.inetaddress.lookuphostbyname(inetaddress.java:385) 08-08 10:18:50.295: e/androidruntime(14239): @ java.net.inetaddress.getallbynameimpl(inetaddress.java:236) 08-08 10:18:50.295: e/androidruntime(14239): @ java.net.inetaddress.getallbyname(inetaddress.java:214) 08-08 10:18:50.295: e/androidruntime(14239): @ org.apache.http.impl.conn.defaultclientconnectionoperator.openconnection(defaultclientconnectionoperator.java:137) 08-08 10:18:50.295: e/androidruntime(14239): @ org.apache.http.impl.conn.abstractpoolentry.open(abstractpoolentry.java:164) 08-08 10:18:50.295: e/androidruntime(14239): @ org.apache.http.impl.conn.abstractpooledconnadapter.open(abstractpooledconnadapter.java:119) 08-08 10:18:50.295: e/androidruntime(14239): @ org.apache.http.impl.client.defaultrequestdirector.execute(defaultrequestdirector.java:360) 08-08 10:18:50.295: e/androidruntime(14239): @ org.apache.http.impl.client.abstracthttpclient.execute(abstracthttpclient.java:670) 08-08 10:18:50.295: e/androidruntime(14239): @ org.apache.http.impl.client.abstracthttpclient.execute(abstracthttpclient.java:509) 08-08 10:18:50.295: e/androidruntime(14239): @ org.apache.http.impl.client.abstracthttpclient.execute(abstracthttpclient.java:487) 08-08 10:18:50.295: e/androidruntime(14239): @ com.example.samplejsonparsing.jsonparser.getjsonfromurl(jsonparser.java:38) 08-08 10:18:50.295: e/androidruntime(14239): @ com.example.samplejsonparsing.androidjsonparsingactivity.oncreate(androidjsonparsingactivity.java:54) 08-08 10:18:50.295: e/androidruntime(14239): @ android.app.activity.performcreate(activity.java:5206) 08-08 10:18:50.295: e/androidruntime(14239): @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1083) 08-08 10:18:50.295: e/androidruntime(14239): @ android.app.activitythread.performlaunchactivity(activitythread.java:2064) 08-08 10:18:50.295: e/androidruntime(14239): ... 11 more 08-08 10:19:39.280: i/process(14239): sending signal. pid: 14239 sig: 9 androidmanifest
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.samplejsonparsing" android:versioncode="1" android:versionname="1.0" > <uses-sdk android:minsdkversion="8" android:targetsdkversion="17" /> <uses-permission android:name="android.permission.internet"/> <application android:allowbackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/apptheme" > <activity android:name="com.example.samplejsonparsing.androidjsonparsingactivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.main" /> <category android:name="android.intent.category.launcher" /> </intent-filter> </activity> <activity android:label="@string/app_name" android:name="com.example.samplejsonparsing.singlemenuitemactivity" > </activity> </application> </manifest>
i have downloaded project , compiled on system. working fine. please check manifest.xml if have added "internet" permission. please add logcat output here 1 can understand error.
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