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Editorial Team
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Asked: 2026-06-14T10:01:23+00:00

I have this type of error can you help me how can i solve

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I have this type of error can you help me how can i solve it
or what is the problem
knowing that this code i use it with other spinner with other class and it is work
so it kind of confusing me
dose the problem having because i have to spinner or it not?
her is my logcat

    11-16 21:56:27.841: E/AndroidRuntime(794): FATAL EXCEPTION: main
11-16 21:56:27.841: E/AndroidRuntime(794): java.lang.NullPointerException
11-16 21:56:27.841: E/AndroidRuntime(794):  at android.widget.ArrayAdapter.getCount(ArrayAdapter.java:291)
11-16 21:56:27.841: E/AndroidRuntime(794):  at android.widget.AbsSpinner.setAdapter(AbsSpinner.java:113)
11-16 21:56:27.841: E/AndroidRuntime(794):  at com.example.test1.MainActivity$LoadAllSection.onPostExecute(MainActivity.java:220)
11-16 21:56:27.841: E/AndroidRuntime(794):  at com.example.test1.MainActivity$LoadAllSection.onPostExecute(MainActivity.java:1)
11-16 21:56:27.841: E/AndroidRuntime(794):  at android.os.AsyncTask.finish(AsyncTask.java:417)
11-16 21:56:27.841: E/AndroidRuntime(794):  at android.os.AsyncTask.access$300(AsyncTask.java:127)
11-16 21:56:27.841: E/AndroidRuntime(794):  at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:429)
11-16 21:56:27.841: E/AndroidRuntime(794):  at android.os.Handler.dispatchMessage(Handler.java:99)
11-16 21:56:27.841: E/AndroidRuntime(794):  at android.os.Looper.loop(Looper.java:123)
11-16 21:56:27.841: E/AndroidRuntime(794):  at android.app.ActivityThread.main(ActivityThread.java:4627)
11-16 21:56:27.841: E/AndroidRuntime(794):  at java.lang.reflect.Method.invokeNative(Native Method)
11-16 21:56:27.841: E/AndroidRuntime(794):  at java.lang.reflect.Method.invoke(Method.java:521)
11-16 21:56:27.841: E/AndroidRuntime(794):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
11-16 21:56:27.841: E/AndroidRuntime(794):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
11-16 21:56:27.841: E/AndroidRuntime(794):  at dalvik.system.NativeStart.main(Native Method)
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1 Answer

  1. Editorial Team

    From the logcat:

    Caused by: java.lang.NullPointerException
    at com.example.test1.MainActivity$LoadAllSection.doInBackground(MainActivity.java:195)

    And since you said this is line 195:

    sectionList.add(map1);

    It simply means that sectionList is null, you forgot to initialize it with: 

    sectionList = new ArrayList<HashMap<String, String>>();

    Ok, with your new LogCat the trouble starts with line 220, which appears to be:

    spinner2.setAdapter(adapter2);

    Once again sectionList is to blame, this error only occurs when you try to pass an adapter bound to a null dataset.

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