Java 为什么我会得到NullPointerException？

当我指向某个存在的东西时，为什么会出现NullPointerException

View header = (View)inflater.inflate(R.layout.listview_header_row, null);

类别代码

public class FeaturedDealsFragment extends Fragment {

@Override  
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {  

    View V = inflater.inflate(R.layout.fragment_featured_deals, container, false);
    ListView LV = (ListView) this.getActivity().findViewById(R.id.dealsListView);

    Deal deal_data[] = new Deal[]
            {
                new Deal("Deal 1", R.drawable.scenery, "500/100 Supporters", "$500"),
                new Deal("Deal 2", R.drawable.scenery, "500/100 Supporters", "$500"),
                new Deal("Deal 3", R.drawable.scenery, "500/100 Supporters", "$500"),
                new Deal("Deal 4", R.drawable.scenery, "500/100 Supporters", "$500"),
                new Deal("Deal 5", R.drawable.scenery, "500/100 Supporters", "$500")
            };

    DealAdapter adapter = new DealAdapter(getActivity(), R.layout.listview_item_row, deal_data);

    View header = (View)inflater.inflate(R.layout.listview_header_row, null);

    LV.addHeaderView(header);
    LV.setAdapter(adapter);

    return V;

}

}

列表视图\标题\行XML

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" 
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"> 

<TextView android:id="@+id/txtHeader"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:background="#ffffff"
    style="@style/fragment_main_heading"
    android:textColor="#000000"
    android:text="@string/featuredDeals" />

</LinearLayout>

试试这个

ListView LV = (ListView) V.findViewById(R.id.dealsListView);

而不是这个

ListView LV = (ListView) this.getActivity().findViewById(R.id.dealsListView);

因为

V

是父视图，所以您需要使用此..

尝试此

ListView LV = (ListView) V.findViewById(R.id.dealsListView);

而不是这个

ListView LV = (ListView) this.getActivity().findViewById(R.id.dealsListView);

---

因为

V

是父视图，所以您需要使用此..

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