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I don't now the meaning of this LogCat entry. Can someone help me?

12-26 18:33:09.651: E/AndroidRuntime(26038): FATAL EXCEPTION: main
12-26 18:33:09.651: E/AndroidRuntime(26038): java.lang.NullPointerException
12-26 18:33:09.651: E/AndroidRuntime(26038):    at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:394)
12-26 18:33:09.651: E/AndroidRuntime(26038):    at android.widget.ArrayAdapter.getView(ArrayAdapter.java:362)
12-26 18:33:09.651: E/AndroidRuntime(26038):    at android.widget.AbsListView.obtainView(AbsListView.java:2090)
12-26 18:33:09.651: E/AndroidRuntime(26038):    at android.widget.ListView.measureHeightOfChildren(ListView.java:1485)
12-26 18:33:09.651: E/AndroidRuntime(26038):    at android.widget.ListView.onMeasure(ListView.java:1348)
12-26 18:33:09.651: E/AndroidRuntime(26038):    at android.view.View.measure(View.java:12937)
12-26 18:33:09.651: E/AndroidRuntime(26038):    at android.widget.RelativeLayout.measureChild(RelativeLayout.java:579)
12-26 18:33:09.651: E/AndroidRuntime(26038):    at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:392)
12-26 18:33:09.651: E/AndroidRuntime(26038):    at android.view.View.measure(View.java:12937)
12-26 18:33:09.651: E/AndroidRuntime(26038):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5045)
12-26 18:33:09.651: E/AndroidRuntime(26038):    at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
12-26 18:33:09.651: E/AndroidRuntime(26038):    at android.view.View.measure(View.java:12937)
12-26 18:33:09.651: E/AndroidRuntime(26038):    at android.widget.LinearLayout.measureVertical(LinearLayout.java:812)
12-26 18:33:09.651: E/AndroidRuntime(26038):    at android.widget.LinearLayout.onMeasure(LinearLayout.java:553)
12-26 18:33:09.651: E/AndroidRuntime(26038):    at android.view.View.measure(View.java:12937)
12-26 18:33:09.651: E/AndroidRuntime(26038):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5045)
12-26 18:33:09.651: E/AndroidRuntime(26038):    at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
12-26 18:33:09.651: E/AndroidRuntime(26038):    at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2180)
12-26 18:33:09.651: E/AndroidRuntime(26038):    at android.view.View.measure(View.java:12937)
12-26 18:33:09.651: E/AndroidRuntime(26038):    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1227)
12-26 18:33:09.651: E/AndroidRuntime(26038):    at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2700)
12-26 18:33:09.651: E/AndroidRuntime(26038):    at android.os.Handler.dispatchMessage(Handler.java:99)
12-26 18:33:09.651: E/AndroidRuntime(26038):    at android.os.Looper.loop(Looper.java:156)
12-26 18:33:09.651: E/AndroidRuntime(26038):    at android.app.ActivityThread.main(ActivityThread.java:5099)
12-26 18:33:09.651: E/AndroidRuntime(26038):    at java.lang.reflect.Method.invokeNative(Native Method)
12-26 18:33:09.651: E/AndroidRuntime(26038):    at java.lang.reflect.Method.invoke(Method.java:511)
12-26 18:33:09.651: E/AndroidRuntime(26038):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
12-26 18:33:09.651: E/AndroidRuntime(26038):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
12-26 18:33:09.651: E/AndroidRuntime(26038):    at dalvik.system.NativeStart.main(Native Method)
12-26 18:33:11.691: D/Process(26038): killProcess, pid=26038
12-26 18:33:11.691: D/Process(26038): dalvik.system.VMStack.getThreadStackTrace(Native Method)
12-26 18:33:11.691: D/Process(26038): java.lang.Thread.getStackTrace(Thread.java:599)
12-26 18:33:11.691: D/Process(26038): android.os.Process.killProcess(Process.java:813)
12-26 18:33:11.691: D/Process(26038): com.android.internal.os.RuntimeInit$UncaughtHandler.uncaughtException(RuntimeInit.java:104)
12-26 18:33:11.701: D/Process(26038): java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:693)
12-26 18:33:11.701: D/Process(26038): java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:690)
12-26 18:33:11.701: D/Process(26038): dalvik.system.NativeStart.main(Native Method)
A--C
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android
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    Please post the code where you create the `ArrayAdapter` you used in the app that generated this stack trace. – CommonsWare Dec 26 '12 at 17:34
  • ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, values); – android Dec 26 '12 at 17:37
  • when i get logcat errors that i can't identify, first i find the keyword of the actual exception. like here `....NullPointerException` i google it to find what it is and what kind of things cause it. Then i look through the stack trace to find the first line pointing to something in my project, like here `...android.widget.ArrayAdapter.getView(ArrayAdapter.java:362)`. Then i look for any matches between my code and said exception. It looks like your `ArrayAdapter` is having a hard time conjuring views due to a `null` reference. – mango Dec 26 '12 at 17:47

1 Answers1

2
java.lang.NullPointerException
    at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:394)

ArrayAdapter<Comment> adapter = 
    new ArrayAdapter<Comment>(this, android.R.layout.simple_list_item_1, values);

values has at least one null object in it, which you cannot have.

You can read through the source code and see this happens here:

T item = getItem(position);
if (item instanceof CharSequence) {
    text.setText((CharSequence)item);
} else {
    text.setText(item.toString()); // Line 394, when item is null this throws an NPE
}
Sam
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