NullPointerException-技术博客集

NullPointerException
编程技术 / houtizong 发布于 3年前 138

java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.View.getImportantForAccessibility()' on a null object reference

出现以上异常.然后就在baidu上搜，结果终于找到一个靠谱点的了.参见:

http://stackoverflow.com/questions/28601476/java-lang-nullpointerexception-attempt-to-invoke-virtual-method-int-android-vi

虽然是英语的，看看就差不多了，知道什么意思了.

I'm trying to put together a shopping list app , based on input fields , ArrayList, and ListView. The app will be based on Fragments. However, I have encountered a problem and I do not know how to solve it

I looked around on both Google and StackOverflow have found some information . However , I have not got it to work. Now hope that I can get help with my code .

I'm relatively inexperienced in Android development .

Thanks in advance

之后给出了错误:

In your public View getView method change return null to convertView;

然后，我就解决了，突然觉得我是不是要在学学英语了.

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<div > &nbsp; &nbsp; java.lang.NullPointerException: Attempt to invoke virtual method 'int&nbsp;android.view.View.getImportantForAccessibility()' on a null object reference &nbsp; &nbsp; 出现以上异常.然后就在baidu上搜，结果终于找到一个靠谱点的了.参见: http://stackoverflow.com/questions/28601476/java-lang-nullpointerexception-attempt-to-invoke-virtual-method-int-android-vi &nbsp; &nbsp; &nbsp;虽然是英语的，看看就差不多了，知道什么意思了. &nbsp; &nbsp;I'm trying to put together a shopping list app , based on input fields ,&nbsp;ArrayList, and&nbsp;ListView. The app will be based on&nbsp;Fragments. However, I have encountered a problem and I do not know how to solve it &nbsp;&nbsp;I looked around on both Google and StackOverflow have found some information . However , I have not got it to work. Now hope that I can get help with my code . I'm relatively inexperienced in Android development . Thanks in advance &nbsp; &nbsp; 之后给出了错误: &nbsp; In your public View getView method change return null to convertView; &nbsp; &nbsp; 然后，我就解决了，突然觉得我是不是要在学学英语了. &nbsp; &nbsp; &nbsp;&nbsp; </div>

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