JSONObject不適用於Android 2.3，但適用於Android 4.2，爲什麼？

我正在爲一個JSONObject請求服務器，它包含一些id的列表。這與Android 4.2一起工作良好，但與Android 2.3不兼容（已在設備和模擬器上進行測試）。JSONObject不適用於Android 2.3，但適用於Android 4.2，爲什麼？

JSONObject如下。

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

這與4.2的正常工作，但在2.3中顯示NullPointerException。

我的logcat如下：

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

來源

2013-06-06 Mr.India

當初始化的JSONObject保持它的空一些建議。 –

您在doinBackgroung方法中獲得NullPointerException。最好在onPost方法中打印json響應的開始解析。 –

@VarunVishnoi和sunil ..不工作。 –