JSONObject不适用于Android 2.3但适用于Android 4.2，为什么？

Question

I am requesting server for a JSONObject and it contains a list of some ids. This is working fine with Android 4.2 but not working with Android 2.3 (have tested on both Device and Emulator.)

The JSONObject is as follows.

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

This works fine with 4.2, but shows NullPointerException in 2.3.

My LogCat is as follows:

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

只需将json库文件导入您的项目http://www.json.org/java/index.html https://code.google.com/p/android-json-rpc/downloads/list

Answer 2

download the org.json jar and import it. It should work for 2.3 also.

Refer this ..

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

Answer 3

Have you tried setting the responseType to json . If the issue still exists there are some suggestions in these posts

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

Issue initializing a JSONObject

JSON parsing problem