遇到一些麻煩我的自定義列表視圖..的Android - NullPointerException異常上的ListView滾動
每個視圖有一個上點擊監聽器工作正常,除了可以向下滾動後所看到的視圖,它拋出一個NullPointerException異常時點擊其中之一。
如果在滾動前可以看到這些視圖,這些視圖實際上是可行的,所以它有點令人困惑。
我的自定義列表視圖代碼如下所示:
public class UserListView extends ArrayAdapter<User>{
int resource;
Context context;
String response;
public UserListView(Context context, int resource, List<User> users){
super(context,resource,users);
this.resource=resource;
}
public View getView(int position, View convertView, ViewGroup parent){
LinearLayout userView;
User user = getItem(position);
userView = new LinearLayout(getContext());
String inflater = Context.LAYOUT_INFLATER_SERVICE;
LayoutInflater layoutInflate;
layoutInflate = (LayoutInflater)getContext().getSystemService(inflater);
layoutInflate.inflate(resource, userView, true);
TextView name = (TextView) userView.findViewById(R.id.name);
RatingBar userRating = (RatingBar) userView.findViewById(R.id.userRatingBar);
name.setText(String.valueOf(user.getName()));
float percentageNumber = ((float) user.getTotalQuestionsCorrect()/(float) user.getTotalQuestionsAnswered()) * 100;
int percentage = (int)percentageNumber;
setStars(userRating, percentage);
userView.setId(user.getUserId());
return userView;
}
private void setStars(RatingBar rb, int percent){
RatingBar starRating = rb;
int percentage = percent;
if(percentage <= 5){starRating.setRating(0);}
else if(percentage < 25){starRating.setRating(1);}
else if(percentage >= 25 && percentage < 50){starRating.setRating(2);}
else if(percentage >= 50 && percentage < 75){starRating.setRating(3);}
else if(percentage >= 75 && percentage < 100){starRating.setRating(4);}
else{starRating.setRating(5);}
}
}
任何幫助將感謝感謝:)
嗨CaseyB,懂了工作,原來它是從我用getChildAt而非getItemAtPosition,還是,你的解釋是非常有益的:)我的主要活動範圍內的問題 – Draynaa 2012-02-11 09:42:19