Question

我在我的应用程序中遇到一个奇怪的错误，我在下面的代码中得到NULL异常，有时候（有时候是的，听起来很奇怪!!!）

请看看

String appId = preferences.getString(ProjectConstants.IMEI_NO, null);
    if (appId == null) {
        // Here i am getting exception:
        TelephonyManager manager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE); 
        appId = manager.getDeviceId();
        preferences.edit().putString(ProjectConstants.IMEI_NO, appId);
    }

Logcat

    java.lang.RuntimeException: An error occured while executing doInBackground()
 at android.os.AsyncTask$3.done(AsyncTask.java:278)
 at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
 at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
 at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
 at java.util.concurrent.FutureTask.run(FutureTask.java:137)
 at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
 at java.lang.Thread.run(Thread.java:856) Caused by: java.lang.NullPointerException
 at com.homeshop18.service.GSONfunctions.getGSONfromURL(GSONfunctions.java:115)
 at com.homeshop18.ui.myorder.MyOrdersFragment$DownloadMyOrders.doInBackground(MyOrdersFragment.java:92)
 at com.homeshop18.ui.myorder.MyOrdersFragment$DownloadMyOrders.doInBackground(MyOrdersFragment.java:1)
 at android.os.AsyncTask$2.call(AsyncTask.java:264)
 at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) ... 5 more

任何帮助将不胜感激..：D

Answer 1

您的logcat日志清楚地显示，

在 com.homeshop18.service.GSONfunctions.getGSONfromURL（GSONfunctions.java:115）

请在第115行检查，有空的东西，你正试图访问它的财产。

更新，如果您的第一个代码段来自GSONfunctions，则必须检查context是否为空。

运行时异常Android

1 个答案: