basically i've got android app , mysql database , i'm using php try , populate listview entries it. reason following code seems crash , logcat says there's issue windowmanager
the code is:
allcomediansactivity.java:
package com.example.connecttest; public class allcomediansactivity extends listactivity { // progress dialog private progressdialog pdialog; // creating json parser object jsonparser jparser = new jsonparser(); arraylist<hashmap<string,string>> comedianlist; // url comedian names private static string url_all_comedians = "http://localhost/connect/get_all_comedians.php"; //json node names private static final string tag_success = "success"; private static final string tag_comedian = "comedian"; private static final string tag_pid = "id"; private static final string tag_name = "name"; // products jsonarray jsonarray comedians = null; public void oncreate(bundle savedinstancestate){ super.oncreate(savedinstancestate); setcontentview(r.layout.all_comedians); //hashmap listview comedianlist = new arraylist<hashmap<string, string>>(); //loading comedians in background thread new loadallcomedians().execute(); // listview listview lv = getlistview(); lv.setonitemclicklistener(new onitemclicklistener(){ public void onitemclick(adapterview<?> parent, view view, int position, long id){ // getting values selected listitem string pid = ((textview) view.findviewbyid(r.id.id)).gettext().tostring(); // } }); } class loadallcomedians extends asynctask<string, string, string>{ // before starting background thread show progress dialog protected void onpreexecute(){ super.onpreexecute(); pdialog = new progressdialog(allcomediansactivity.this); pdialog.setmessage("loading products. please wait..."); pdialog.setindeterminate(false); pdialog.setcancelable(false); pdialog.show(); } @override protected string doinbackground(string... args) { // building parameters list<namevaluepair> params = new arraylist<namevaluepair>(); // getting json string url jsonobject json = jparser.makehttprequest(url_all_comedians, "get", params); //check log cat json response log.d("all comedians: ", json.tostring()); try{ //checking success tag in json int success = json.getint(tag_success); if(success == 1){ // comedians found // getting array of comedians comedians = json.getjsonarray(tag_comedian); // looping through comedians for(int = 0; < comedians.length(); i++){ jsonobject c = comedians.getjsonobject(i); // storing each json item in variable string id = c.getstring(tag_pid); string name = c.getstring(tag_name); // creating new hashmap hashmap<string, string> map = new hashmap<string, string>(); // adding each child node hashmap key => value map.put(tag_pid, id); map.put(tag_name,name); // adding hashlist arraylist comedianlist.add(map); } } else { // no products found // launch add new comedian activity intent = new intent(getapplicationcontext(), newcomedianactivity.class); // closing previous activities i.addflags(intent.flag_activity_clear_top); startactivity(i); } } catch (jsonexception e){ e.printstacktrace(); } return null; } // after completing background task dismiss progress dialog protected void onpostexecute(string file_url){ // dismiss dialog after getting comedians pdialog.dismiss(); // updating ui background thread runonuithread(new runnable(){ public void run(){ // updating json data listview listadapter adapter = new simpleadapter(allcomediansactivity.this, comedianlist, r.layout.list_item, new string[] {tag_pid, tag_name}, new int[] {r.id.id,r.id.name}); setlistadapter(adapter); } }); } } } i have correct imports removed them sake of brevity.
the jsonparser references is:
jsonparser.java:
package com.example.connecttest; public class jsonparser { static inputstream = null; static jsonobject jobj = null; static string json = ""; // constructor public jsonparser() { } // function json url // making http post or method public jsonobject makehttprequest(string url, string method, list<namevaluepair> params) { // making http request try { // check request method if(method == "post"){ // request method post // defaulthttpclient defaulthttpclient httpclient = new defaulthttpclient(); httppost httppost = new httppost(url); httppost.setentity(new urlencodedformentity(params)); httpresponse httpresponse = httpclient.execute(httppost); httpentity httpentity = httpresponse.getentity(); = httpentity.getcontent(); }else if(method == "get"){ // request method defaulthttpclient httpclient = new defaulthttpclient(); string paramstring = urlencodedutils.format(params, "utf-8"); url += "?" + paramstring; httpget httpget = new httpget(url); httpresponse httpresponse = httpclient.execute(httpget); 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; } } and php file returns following information when navigate in browser:
{"comedian":[{"id":"1","name":"mike coombes","address":"test","email":"test@test.com","tel":"xxxxxxxx"},{"id":"2","name":"test","address":"test","email":"tester@test.com","tel":"xxxxxxx"}],"success":1} so php querying database correctly , returning using json.
now debugging program showed seems far following line:
jsonobject json = jparser.makehttprequest(url_all_comedians, "get", params); before comes unstuck, i've been pulling hair out hours trying work no avail, wondering if people me work through problem on here!
as asked logcat errors are:
03-21 05:57:10.319: e/buffer error(3500): error converting result java.lang.nullpointerexception: lock == null 03-21 05:57:10.319: e/json parser(3500): error parsing data org.json.jsonexception: end of input @ character 0 of 03-21 05:57:10.329: e/androidruntime(3500): fatal exception: asynctask #1 03-21 05:57:10.329: e/androidruntime(3500): java.lang.runtimeexception: error occured while executing doinbackground() 03-21 05:57:10.329: e/androidruntime(3500): @ android.os.asynctask$3.done(asynctask.java:299) 03-21 05:57:10.329: e/androidruntime(3500): @ java.util.concurrent.futuretask.finishcompletion(futuretask.java:352) 03-21 05:57:10.329: e/androidruntime(3500): @ java.util.concurrent.futuretask.setexception(futuretask.java:219) 03-21 05:57:10.329: e/androidruntime(3500): @ java.util.concurrent.futuretask.run(futuretask.java:239) 03-21 05:57:10.329: e/androidruntime(3500): @ android.os.asynctask$serialexecutor$1.run(asynctask.java:230) 03-21 05:57:10.329: e/androidruntime(3500): @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1080) 03-21 05:57:10.329: e/androidruntime(3500): @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:573) 03-21 05:57:10.329: e/androidruntime(3500): @ java.lang.thread.run(thread.java:856) 03-21 05:57:10.329: e/androidruntime(3500): caused by: java.lang.nullpointerexception 03-21 05:57:10.329: e/androidruntime(3500): @ com.example.connecttest.allcomediansactivity$loadallcomedians.doinbackground(allcomediansactivity.java:93) 03-21 05:57:10.329: e/androidruntime(3500): @ com.example.connecttest.allcomediansactivity$loadallcomedians.doinbackground(allcomediansactivity.java:1) 03-21 05:57:10.329: e/androidruntime(3500): @ android.os.asynctask$2.call(asynctask.java:287) 03-21 05:57:10.329: e/androidruntime(3500): @ java.util.concurrent.futuretask.run(futuretask.java:234) 03-21 05:57:10.329: e/androidruntime(3500): ... 4 more
i managed working in end had 2 problems
switched localhost 10.0.2.2 , had add protocol url
also had typo permission , had change users-permission uses-permission working fine now
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