Arrayadapter.getcount null point exception

Question

I am getting the following stack trace (below is a complete copy) , this gives me little or no indication as to where in a massive application it is when going wrong and user feedback is nothing beyond "It crashed".

Is there anything I can do to pinpoint this more ?

java.lang.NullPointerException at android.widget.ArrayAdapter.getCount(ArrayAdapter.java:291)
    at android.widget.AdapterView.checkFocus(AdapterView.java:689)
    at android.widget.AdapterView$AdapterDataSetObserver.onInvalidated(AdapterView.java:813)
    at android.database.DataSetObservable.notifyInvalidated(DataSetObservable.java:43)
    at android.widget.BaseAdapter.notifyDataSetInvalidated(BaseAdapter.java:54)
    at android.widget.ArrayAdapter$ArrayFilter.publishResults(ArrayAdapter.java:469)
    at android.widget.Filter$ResultsHandler.handleMessage(Filter.java:282)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:143)
    at android.app.ActivityThread.main(ActivityThread.java:4701)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:521)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
    at dalvik.system.NativeStart.main(Native Method)

Mudassir · Accepted Answer · 2013-06-20 08:07:39Z

10

Look at the code for ArrayAdapter.getCount():

   /**
     * {@inheritDoc}
     */
    public int getCount() {
        return mObjects.size();
    }

Clearly mObjects is null, i.e. your ListView or other AdapterView-derived type is trying to use the adapter before you've initialized it with it's data.

edited Jun 20, 2013 at 8:07

Mudassir

13.2k8 gold badges64 silver badges92 bronze badges

answered Feb 22, 2011 at 9:57

Reuben Scratton

38.7k9 gold badges81 silver badges88 bronze badges

Sign up to request clarification or add additional context in comments.

5 Comments

Chris Over a year ago

Thanks, there is one adapter where I forgot to add a check, will add it and hopefully it will go away. No idea why I didn't think of that - sometimes you need that fresh pair of eyes

Reuben Scratton Over a year ago

No worries. Note that the call comes in response to a Handler, suggesting a background thread is maybe signalling the UI thread when it shouldn't.

Mudassir Over a year ago

@ReubenScratton: The link was not working. Corrected it, please check.

Cyph3rCod3r Over a year ago

@ReubenScratton actually i am getting similar error, Could you elaborate more :(

Reuben Scratton Over a year ago

There's nothing more I can add. Look to where your adapter is initialized and ensure that it is set up correctly before any view code tries to use it.

matsjoe · Accepted Answer · 2011-02-22 10:15:46Z

0

What you could do is putting debug information before every call to getCount() using the Log class

Log.d("tag", "Trying to get count on line 50 class Test");

then open logcat and find the last entry of this log before the error occures. Then you have the right location of the crash.

answered Feb 22, 2011 at 10:15

matsjoe

1,48012 silver badges17 bronze badges

Collectives™ on Stack Overflow

Arrayadapter.getcount null point exception

2 Answers 2

5 Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

5 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related