android - AsyncTask with above API 11 makes app crashed -
i using asynctask , gson parse feed , works properly. in 1 fragment getting forced close of app on device above api 11. okay in devices below api 11. code:
public class latestsubmissions extends sherlocklistfragment { sharedpreferences prefs; latestsubmissionsadapter adapter = null; arraylist<hashmap<string, string>> submissions = new arraylist<hashmap<string, string>>(); private getsubmissionslisttask submissiontask = null; @override public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) { connectiondetector cd = new connectiondetector(getsherlockactivity()); if (cd.isconnectingtointernet()) { prefs = getsherlockactivity().getsharedpreferences( commonutils.preference_name, 0); submissiontask = new getsubmissionslisttask(); submissiontask.execute(commonutils.user_submission_url + prefs.getstring(commonutils.key_user_id, "339") + "/10"); } else { mainactivity.networkavailabilitynotice(getsherlockactivity()); } return super.oncreateview(inflater, container, savedinstancestate); } protected class getsubmissionslisttask extends asynctask<string, void, inputstreamreader> { @override protected inputstreamreader doinbackground(string... params) { return new jsondownloader().getjsonstringfromurl(params[0]); } @override protected void onpostexecute(inputstreamreader isr) { if (isr != null) { mainactivity activity = (mainactivity) getsherlockactivity(); jsonreader reader = new jsonreader(isr); try { reader.beginobject(); reader.nextname(); // name reader.skipvalue(); reader.nextname(); // uname reader.skipvalue(); string subs = reader.nextname(); // subs if (subs.equals(commonutils.key_submission)) { reader.beginarray(); while (reader.hasnext()) { hashmap<string, string> map = new hashmap<string, string>(); reader.beginarray(); reader.skipvalue(); // submission id string txt = "latest problem"; problems obj = mainactivity.problems.get(reader .nextint()); if (obj != null) { txt = obj.getproblemsinfo(); } map.put(commonutils.key_problem_id, txt); verdict verdict = activity.verdicts.get(reader .nextstring()); // verdict id map.put(commonutils.key_verdict_color, verdict.verdictcolorhex); map.put(commonutils.key_verdict_id, verdict.name); double exectime = reader.nextdouble() / 1000; // execution // time map.put(commonutils.key_runtime, exectime.tostring() + "s"); reader.skipvalue(); // submission time map.put(commonutils.key_language_id, activity.languagecode.get(reader .nextstring())); // lanugage // id map.put(commonutils.key_submission_rank, reader.nextstring()); // rank submissions.add(map); reader.endarray(); } reader.endarray(); } reader.endobject(); reader.close(); } catch (ioexception e) { if (commonutils.isdebuggable) { log.e("gson parser", "error parsing data " + e.tostring()); } } collections.reverse(submissions); adapter = new latestsubmissionsadapter(getsherlockactivity(), submissions); setlistadapter(adapter); } } } @override public void onstop() { super.onstop(); if (submissiontask != null && submissiontask.getstatus() != asynctask.status.finished) { submissiontask.cancel(true); } } } ihave tested in several devices , emulators different api level , forced close in 2 devices ics , jellybean. log cat:
08-19 01:57:16.961: e/androidruntime(710): fatal exception: main 08-19 01:57:16.961: e/androidruntime(710): android.os.networkonmainthreadexception 08-19 01:57:16.961: e/androidruntime(710): @ android.os.strictmode$androidblockguardpolicy.onnetwork(strictmode.java:1099) 08-19 01:57:16.961: e/androidruntime(710): @ libcore.io.blockguardos.recvfrom(blockguardos.java:163) 08-19 01:57:16.961: e/androidruntime(710): @ libcore.io.iobridge.recvfrom(iobridge.java:503) 08-19 01:57:16.961: e/androidruntime(710): @ java.net.plainsocketimpl.read(plainsocketimpl.java:488) 08-19 01:57:16.961: e/androidruntime(710): @ java.net.plainsocketimpl.access$000(plainsocketimpl.java:46) 08-19 01:57:16.961: e/androidruntime(710): @ java.net.plainsocketimpl$plainsocketinputstream.read(plainsocketimpl.java:240) 08-19 01:57:16.961: e/androidruntime(710): @ org.apache.http.impl.io.abstractsessioninputbuffer.fillbuffer(abstractsessioninputbuffer.java:103) 08-19 01:57:16.961: e/androidruntime(710): @ org.apache.http.impl.io.abstractsessioninputbuffer.read(abstractsessioninputbuffer.java:134) 08-19 01:57:16.961: e/androidruntime(710): @ org.apache.http.impl.io.contentlengthinputstream.read(contentlengthinputstream.java:174) 08-19 01:57:16.961: e/androidruntime(710): @ org.apache.http.conn.eofsensorinputstream.read(eofsensorinputstream.java:159) 08-19 01:57:16.961: e/androidruntime(710): @ java.io.inputstreamreader.read(inputstreamreader.java:244) 08-19 01:57:16.961: e/androidruntime(710): @ com.google.gson.stream.jsonreader.fillbuffer(jsonreader.java:1263) 08-19 01:57:16.961: e/androidruntime(710): @ com.google.gson.stream.jsonreader.nextquotedvalue(jsonreader.java:1005) 08-19 01:57:16.961: e/androidruntime(710): @ com.google.gson.stream.jsonreader.nextstring(jsonreader.java:811) 08-19 01:57:16.961: e/androidruntime(710): @ me.kaidul.uhunt.ranklist$getranklisttask.onpostexecute(ranklist.java:85) 08-19 01:57:16.961: e/androidruntime(710): @ me.kaidul.uhunt.ranklist$getranklisttask.onpostexecute(ranklist.java:1) 08-19 01:57:16.961: e/androidruntime(710): @ android.os.asynctask.finish(asynctask.java:602) 08-19 01:57:16.961: e/androidruntime(710): @ android.os.asynctask.access$600(asynctask.java:156) 08-19 01:57:16.961: e/androidruntime(710): @ android.os.asynctask$internalhandler.handlemessage(asynctask.java:615) 08-19 01:57:16.961: e/androidruntime(710): @ android.os.handler.dispatchmessage(handler.java:99) 08-19 01:57:16.961: e/androidruntime(710): @ android.os.looper.loop(looper.java:137) 08-19 01:57:16.961: e/androidruntime(710): @ android.app.activitythread.main(activitythread.java:4424) 08-19 01:57:16.961: e/androidruntime(710): @ java.lang.reflect.method.invokenative(native method) 08-19 01:57:16.961: e/androidruntime(710): @ java.lang.reflect.method.invoke(method.java:511) 08-19 01:57:16.961: e/androidruntime(710): @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:784) 08-19 01:57:16.961: e/androidruntime(710): @ com.android.internal.os.zygoteinit.main(zygoteinit.java:551) 08-19 01:57:16.961: e/androidruntime(710): @ dalvik.system.nativestart.main(native method) i can't figure out how happening. used same type code in other fragments , worked well. 2 fragments incluing encounter problem.
you need entire reading of input stream in doinbackground. you're doing opening connection in doinbackground , obtaining reader result. however, you're trying read data off network in onpostexecute, executing on main thread.
protected class getsubmissionslisttask extends asynctask<string, void, arraylist<hashmap<string, string>>> { @override protected arraylist<hashmap<string, string>> doinbackground(string... params) { inputstreamreader isr = new jsondownloader().getjsonstringfromurl(params[0]); arraylist<hashmap<string, string>> result = null; if (isr != null) { result = new arraylist<hashmap<string, string>>(); mainactivity activity = (mainactivity) getsherlockactivity(); jsonreader reader = new jsonreader(isr); try { reader.beginobject(); reader.nextname(); // name reader.skipvalue(); reader.nextname(); // uname reader.skipvalue(); string subs = reader.nextname(); // subs if (subs.equals(commonutils.key_submission)) { reader.beginarray(); while (reader.hasnext()) { hashmap<string, string> map = new hashmap<string, string>(); reader.beginarray(); reader.skipvalue(); // submission id string txt = "latest problem"; problems obj = mainactivity.problems.get(reader .nextint()); if (obj != null) { txt = obj.getproblemsinfo(); } map.put(commonutils.key_problem_id, txt); verdict verdict = activity.verdicts.get(reader .nextstring()); // verdict id map.put(commonutils.key_verdict_color, verdict.verdictcolorhex); map.put(commonutils.key_verdict_id, verdict.name); double exectime = reader.nextdouble() / 1000; // execution // time map.put(commonutils.key_runtime, exectime.tostring() + "s"); reader.skipvalue(); // submission time map.put(commonutils.key_language_id, activity.languagecode.get(reader .nextstring())); // lanugage // id map.put(commonutils.key_submission_rank, reader.nextstring()); // rank result.add(map); reader.endarray(); } reader.endarray(); } reader.endobject(); } catch (ioexception e) { if (commonutils.isdebuggable) { log.e("gson parser", "error parsing data " + e.tostring()); } result = null; } { reader.close(); // need close, after exception } } if (result != null) collections.reverse(result); return result; } @override protected void onpostexecute(arraylist<hashmap<string, string>> result) { if (result != null) { submissions = result; // still need this? adapter = new latestsubmissionsadapter(getsherlockactivity(), result); setlistadapter(adapter); } } } 