Arrayadapter.getcount零点异常 [英] Arrayadapter.getcount null point exception
问题描述
我收到以下堆栈跟踪(下面是一个完整的副本),这给了我很少或没有说明其中,在大规模应用中它是会错时和用户反馈是没有超越坠毁。
有什么我可以做,以查明这更?
显示java.lang.NullPointerException在android.widget.ArrayAdapter.getCount(ArrayAdapter.java:291)
在android.widget.AdapterView.checkFocus(AdapterView.java:689)
在android.widget.AdapterView $ AdapterDataSetObserver.onInvalidated(AdapterView.java:813)
在android.database.DataSetObservable.notifyInvalidated(DataSetObservable.java:43)
在android.widget.BaseAdapter.notifyDataSetInvalidated(BaseAdapter.java:54)
在android.widget.ArrayAdapter $ ArrayFilter.publishResults(ArrayAdapter.java:469)
在android.widget.Filter $ ResultsHandler.handleMessage(Filter.java:282)
在android.os.Handler.dispatchMessage(Handler.java:99)
在android.os.Looper.loop(Looper.java:143)
在android.app.ActivityThread.main(ActivityThread.java:4701)
在java.lang.reflect.Method.invokeNative(本机方法)
在java.lang.reflect.Method.invoke(Method.java:521)
在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:868)
在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
在dalvik.system.NativeStart.main(本机方法)
看<一href="http://grep$c$c.com/file/repository.grep$c$c.com/java/ext/com.google.android/android/4.2.2_r1/android/widget/ArrayAdapter.java#ArrayAdapter.getCount%28%29">the为 ArrayAdapter.getCount code ()
:
/ **
* {@inheritDoc}
* /
公众诠释getCount将(){
返回mObjects.size();
}
显然mObjects是空
,即你的ListView或其他适配器视图派生的类型试图使用适配器你与它的数据初始化它。
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)
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.
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