org.json.JSONException：在共享首选项的字符0的输入结束android

这是我的代码。在这里我正在检索存储为字符串的共享首选项的json数据。但我却得到了下面的例外。现在的事情是我试图打印出“String fav”3次，但它只是省略Log.i，并不打印它。所以我无法弄清楚有什么问题..请帮助我提前thnxorg.json.JSONException：在共享首选项的字符0的输入结束android

public class RetriveData { 

static public void savefavRetailer() { 

    JSONArray jArray = new JSONArray(); 
    if (Perma.favRetailer.isEmpty()) { 
     jArray.put(Perma.followerId); 
    } else { 
     try { 
      for (int i = 0; i < Perma.favRetailer.size(); i++) { 
       jArray.put(Perma.favRetailer.get(i)); 
      } 
      jArray.put(Perma.favRetailer.size(), Perma.followerId); 
     } catch (JSONException e) { 
      e.printStackTrace(); 
     } 
    } 
    Perma.editor.putString("favRetailer", jArray.toString()); 
    Perma.editor.putString("favRetailer " + Perma.followerId, Perma.followerName); 
    Perma.editor.commit(); 
} 

static public void removefavRetailer() { 
    Perma.favRetailer.remove(Perma.followerId); 
    JSONArray jArray = new JSONArray(Perma.favRetailer); 
    Perma.editor.putString("favRetailer", jArray.toString()); 
    Perma.editor.commit(); 
} 




static ArrayList<String> getfavRetailer() { 
    String fav ; 
    Log.i("I getArrayofRetailer", "In"); 
    Log.i("I getArrayofRetailer", "In"); 
    fav= Perma.sharedPref.getString("favRetailer", ""); 

    Log.i("REtrive Data fav",""+fav); 
    if (fav != null) { 
     Log.i("REtrive Data 2ndfav",""+fav);  
     try { 
      Log.i("REtrive Data 3rdfav",""+fav); 
      JSONArray jArray = new JSONArray(fav); 
      for (int i = 0; i < jArray.length(); i++) { 
       String temp = jArray.optString(i); 
       Perma.favRetailer.add(temp); 
      } 
      Log.i("I getArrayofRetailer", "jArray " + jArray.toString()); 
     } catch (JSONException e) { 
      Log.i("getArrayofRetailer", "Exception"); 
      e.printStackTrace(); 
     } 
    } 
    return Perma.favRetailer; 
} 

}

这里是日志。现在在这我只得到三次日志???

04-29 11:11:33.165: I/I getArrayofRetailer(882): In 
04-29 11:11:33.165: I/I getArrayofRetailer(882): In 
04-29 11:11:33.176: I/getArrayofRetailer(882): Exception 

04-29 11:11:33.184: W/System.err(882): org.json.JSONException: End of input at character 0 of 
04-29 11:11:33.184: W/System.err(882): at org.json.JSONTokener.syntaxError(JSONTokener.java:446) 
04-29 11:11:33.194: W/System.err(882): at org.json.JSONTokener.nextValue(JSONTokener.java:93) 
04-29 11:11:33.194: W/System.err(882): at org.json.JSONArray.<init>(JSONArray.java:87) 
04-29 11:11:33.194: W/System.err(882): at org.json.JSONArray.<init>(JSONArray.java:103) 
04-29 11:11:33.194: W/System.err(882): at rensoft.connectyfinal.RetriveData.getfavRetailer(RetriveData.java:34) 
04-29 11:11:33.194: W/System.err(882): at rensoft.connectyfinal.Inbox.onCreate(Inbox.java:52) 
04-29 11:11:33.194: W/System.err(882): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
04-29 11:11:33.214: W/System.err(882): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) 
04-29 11:11:33.214: W/System.err(882): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663) 
04-29 11:11:33.214: W/System.err(882): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 
04-29 11:11:33.214: W/System.err(882): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931) 
04-29 11:11:33.214: W/System.err(882): at android.os.Handler.dispatchMessage(Handler.java:99) 
04-29 11:11:33.214: W/System.err(882): at android.os.Looper.loop(Looper.java:123) 
04-29 11:11:33.224: W/System.err(882): at android.app.ActivityThread.main(ActivityThread.java:3683) 
04-29 11:11:33.224: W/System.err(882): at java.lang.reflect.Method.invokeNative(Native Method) 
04-29 11:11:33.224: W/System.err(882): at java.lang.reflect.Method.invoke(Method.java:507) 
04-29 11:11:33.224: W/System.err(882): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
04-29 11:11:33.224: W/System.err(882): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
04-29 11:11:33.234: W/System.err(882): at dalvik.system.NativeStart.main(Native Method)

来源

2013-04-29 riskPlayGround

发布你的json。 – rajeshwaran 2013-04-29 06:04:08

{ “message”：“something”， “type”：“news”， “id”：“32” }但在应用程序启动用户不保存任何数据，因此它将返回null。 – riskPlayGround 2013-04-29 06:07:00

post RetriveData.java并提及第34行。 – rajeshwaran 2013-04-29 06:09:15

改线if (fav != null) {到if (fav.length() == 0) {。

fav= Perma.sharedPref.getString("favRetailer", "");如果SharedPreferences中不存在“favRetailer”项，将返回一个空字符串，因此您必须在解析json之前检查空字符串而不是null。

来源

2013-04-30 20:23:20 TomTasche

org.json.JSONException：在共享首选项的字符0的输入结束android

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