JSONObject non funziona per Android 2.3 ma funziona bene con Android 4.2, perché?

Question

Sto richiedendo un server per un oggetto JSONObject e contiene un elenco di alcuni id. Funziona perfettamente con Android 4.2 ma non funziona con Android 2.3 (sono stati testati sia su Dispositivo che su Emulatore.)

Il JSONObject è il seguente.

{"IdList":[{"id":"004502"},{"id":"S007901"},{"id":"041501"},{"id":"S139001"}]} 

Questo funziona perfettamente con 4.2, ma mostra NullPointerException in 2.3.

mio LogCat è la seguente:

org.json.JSONException: Value Nullpointer of type java.lang.String cannot be converted to JSONObject 
06-06 11:23:46.881: W/System.err(1820):  at org.json.JSON.typeMismatch(JSON.java:107) 
06-06 11:23:46.893: W/System.err(1820):  at org.json.JSONObject.<init>(JSONObject.java:158) 
06-06 11:23:46.893: W/System.err(1820):  at org.json.JSONObject.<init>(JSONObject.java:171) 
06-06 11:23:46.893: W/System.err(1820):  at my.Site.serverInterface.executeHttpRequest(serverInterface.java:128) 
06-06 11:23:46.893: W/System.err(1820):  at my.Site.serverInterface.getAtmId(serverInterface.java:54) 
06-06 11:23:46.901: W/System.err(1820):  at my.Site.TrackLocation$AtmGetter.doInBackground(TrackLocation.java:379) 
06-06 11:23:46.901: W/System.err(1820):  at android.os.AsyncTask$2.call(AsyncTask.java:185) 
06-06 11:23:46.901: W/System.err(1820):  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306) 
06-06 11:23:46.901: W/System.err(1820):  at java.util.concurrent.FutureTask.run(FutureTask.java:138) 
06-06 11:23:46.901: W/System.err(1820):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088) 
06-06 11:23:46.901: W/System.err(1820):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581) 
06-06 11:23:46.901: W/System.err(1820):  at java.lang.Thread.run(Thread.java:1019) 
06-06 11:23:46.901: I/System.out(1820): null 
06-06 11:23:46.912: I/System.out(1820)://e 
06-06 11:23:46.912: W/System.err(1820): java.lang.NullPointerException 
06-06 11:23:46.912: W/System.err(1820):  at my.Site.TrackLocation$AtmGetter.doInBackground(TrackLocation.java:384) 
06-06 11:23:46.912: W/System.err(1820):  at android.os.AsyncTask$2.call(AsyncTask.java:185) 
06-06 11:23:46.912: W/System.err(1820):  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306) 
06-06 11:23:46.912: W/System.err(1820):  at java.util.concurrent.FutureTask.run(FutureTask.java:138) 
06-06 11:23:46.912: W/System.err(1820):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088) 
06-06 11:23:46.912: W/System.err(1820):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581) 
06-06 11:23:46.912: W/System.err(1820):  at java.lang.Thread.run(Thread.java:1019) 
06-06 11:23:46.921: W/dalvikvm(1820): threadid=10: thread exiting with uncaught exception (group=0xb60c84f0) 
06-06 11:23:46.931: E/AndroidRuntime(1820): FATAL EXCEPTION: AsyncTask #3 
06-06 11:23:46.931: E/AndroidRuntime(1820): java.lang.RuntimeException: An error occured while executing doInBackground() 
06-06 11:23:46.931: E/AndroidRuntime(1820):  at android.os.AsyncTask$3.done(AsyncTask.java:200) 
06-06 11:23:46.931: E/AndroidRuntime(1820):  at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274) 
06-06 11:23:46.931: E/AndroidRuntime(1820):  at java.util.concurrent.FutureTask.setException(FutureTask.java:125) 
06-06 11:23:46.931: E/AndroidRuntime(1820):  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308) 
06-06 11:23:46.931: E/AndroidRuntime(1820):  at java.util.concurrent.FutureTask.run(FutureTask.java:138) 
06-06 11:23:46.931: E/AndroidRuntime(1820):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088) 
06-06 11:23:46.931: E/AndroidRuntime(1820):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581) 
06-06 11:23:46.931: E/AndroidRuntime(1820):  at java.lang.Thread.run(Thread.java:1019) 
06-06 11:23:46.931: E/AndroidRuntime(1820): Caused by: java.lang.NullPointerException 
06-06 11:23:46.931: E/AndroidRuntime(1820):  at my.Site.TrackLocation$AtmGetter.doInBackground(TrackLocation.java:427) 
06-06 11:23:46.931: E/AndroidRuntime(1820):  at android.os.AsyncTask$2.call(AsyncTask.java:185) 
06-06 11:23:46.931: E/AndroidRuntime(1820):  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306) 
06-06 11:23:46.931: E/AndroidRuntime(1820):  ... 4 more 

Answer 1

Basta importare i file di libreria JSON al progetto http://www.json.org/java/index.html https://code.google.com/p/android-json-rpc/downloads/list

Answer 2

scaricare il vaso org.json e importarlo. Dovrebbe funzionare anche per 2.3.

consultare questo ..

JSON Parsing works on Android 4.0 but not on Android < 4.0

Answer 3

Hai provato impostando la responseType a json. Se il problema esiste ancora ci sono alcuni suggerimenti in questi post

JSON Parsing works on Android 4.0 but not on Android < 4.0

Issue initializing a JSONObject

JSON parsing problem