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Editorial Team
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Asked: 2026-06-09T04:35:51+00:00

Im just coding the Android application which I thought of in order to learn

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Im just coding the Android application which I thought of in order to learn the SDK a little more and ran into a problem when trying my program with the emulator. The application installs normally and then closes only to give me a logcat saying theres a NullPointerException in the main class. I cant manage to find it anywhere and research says that theres an object being used without it being initialized? I dont think this is possible as if it were the case, Eclipse would give me an error, but in this case it is a runtime exception. I do not have a lot of programming experience especially in Android and this bug is stopping me from seeing if the rest of my program works!

Heres the Source

and heres the Logcat

Thanks in advance for any help

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1 Answer

  1. Editorial Team

    The error occurs on line 80 in your onCreate method in IOweYou.java. You can see it on line 19 in the stacktrace you posted. 

    08-03 07:11:35.068: E/AndroidRuntime(681):      at com.andrei.iou.IOweYou.onCreate(IOweYou.java:80)

    Is localEL properly defined?

    EDIT:
    make your activity extend ExpandableListActivity instead of activity. Then remove setContentView. And change 

    localEl.setListAdapter(mAdapter);

    to

    this.setListAdapter(mAdapter);

    and your list will show. However clicking on the item will still make it crash but its a start!

    EDIT2:
    here is an example I found.
    http://smartandroidians.blogspot.com.es/2010/04/expandablelistactivity-in-android.html

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