java - networkOnMainThreadException error even with Async -


i'm running following code on android studio , trying make api call semantics interface. async code: 

public class downloadtest extends asynctask<void, void, void> {  public string results = "hello"; public products products = new products("key",         "password");  @override protected void doinbackground(void... params) {     // todo auto-generated method stub     // call web service here     scan me = new scan();          /* build request */     products.productsfield("upc", "883974958450").productsfield("fields", "name", "gtins");          /* make request */     try {         results = products.getproducts().tostring();         log.i("try", results);         me.set_vars(results); //set_vars method mainactivity.java     } catch (exception e) {         log.i("mytag0", e.tostring());     }     return null; }  }

i didn't include code onpreexecute() or onpostexecute() because don't have in code methods right now.

in logcat mytag0 see networkonmainthreadexception , i've looked @ other threads , have still unable figure out why i'm getting error. i've included correct internet permissions in androidmanifest 

<uses-permission android:name="android.permission.internet" /> <uses-permission android:name="android.permission.write_external_storage"/>

in mainactivity.java, make call method doinbackground() following way: 

downloadtest work = new downloadtest();     work.doinbackground();     log.i("mytag", my_result);

thanks!

edit: error message/trace when app crashes if change statement above work.execute()

07-13 13:25:17.824    2718-2733/com.example.jesarshah.snapcart e/androidruntime﹕ fatal exception: asynctask #1 process: com.example.jesarshah.snapcart, pid: 2718 java.lang.runtimeexception: error occured while executing doinbackground()         @ android.os.asynctask$3.done(asynctask.java:304)         @ java.util.concurrent.futuretask.finishcompletion(futuretask.java:355)         @ java.util.concurrent.futuretask.setexception(futuretask.java:222)         @ java.util.concurrent.futuretask.run(futuretask.java:242)         @ android.os.asynctask$serialexecutor$1.run(asynctask.java:231)         @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1112)         @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:587)         @ java.lang.thread.run(thread.java:818)  caused by: java.lang.runtimeexception: can't create handler inside thread has not called looper.prepare()         @ android.os.handler.<init>(handler.java:200)         @ android.os.handler.<init>(handler.java:114)         @ android.app.activity.<init>(activity.java:794)         @ android.support.v4.app.fragmentactivity.<init>(fragmentactivity.java:76)         @ android.support.v7.app.appcompatactivity.<init>(appcompatactivity.java:50)         @ android.support.v7.app.actionbaractivity.<init>(actionbaractivity.java:23)         @ com.example.jesarshah.snapcart.scan.<init>(scan.java:32)         @ com.example.jesarshah.snapcart.downloadtest.doinbackground(downloadtest.java:26)         @ com.example.jesarshah.snapcart.downloadtest.doinbackground(downloadtest.java:11)         @ android.os.asynctask$2.call(asynctask.java:292)         @ java.util.concurrent.futuretask.run(futuretask.java:237)

         @ android.os.asynctask$serialexecutor$1.run(asynctask.java:231)             at java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1112)             at java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:587)             at java.lang.thread.run(thread.java:818)

do not call doinbackground(). call execute() or executeonexecutor() main application thread.

since, in case, not have onpostexecute() or of other typical asynctask methods, , since on background thread when want work done, either:

  • just work on background thread on, , rid of asynctask entirely, or

  • switch plain thread

also note scan object appears either subclass of actionbaractivity or creating instance of actionbaractivity. neither of these possible. never create own instances of activities.


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