安卓版面设计.调整标题.

Question

我想在我的应用程序中实现选项卡。选项卡效果很好。现在在其中一个选项卡中实现可扩展的列表视图...这意味着活动会延长Fragment而不是FragmentActivity......但是我在消耗性清单视图中遇到了一个问题......我怎样才能克服这个...这是我的代码...

public class Setting extends Fragment{
    ExplistAdapter listAdapter;
    ExpandableListView expListView;
    List<String> listDataHeader;
    HashMap<String, List<String>> listDataChild;
      @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.setting, container, false);

            expListView = (ExpandableListView)rootView. findViewById(R.id.lvExp);
            // preparing list data
            prepareListData();
            listAdapter = new ExplistAdapter(this, listDataHeader, listDataChild);
            // setting list adapter
            expListView.setAdapter(listAdapter);
            return rootView;
        }
    private void prepareListData() {
        listDataHeader = new ArrayList<String>();
        listDataChild = new HashMap<String, List<String>>();
        // Adding child data
        listDataHeader.add("Top 250");
        listDataHeader.add("Now Showing");
        listDataHeader.add("Coming Soon..");
        // Adding child data
        List<String> top250 = new ArrayList<String>();
        top250.add("Remaining Battery");
        top250.add("Set Alarm Distance");
        top250.add("Pick Alarm Tone");
        top250.add("Set Vibrate");
        List<String> nowShowing = new ArrayList<String>();
        nowShowing.add("Remaining Battery");
        nowShowing.add("Set Alarm Distance");
        nowShowing.add("Pick Alarm Tone");
        nowShowing.add("Set Vibrate");

        List<String> comingSoon = new ArrayList<String>();
        comingSoon.add("2 Guns");
        comingSoon.add("The Smurfs 2");
        comingSoon.add("The Spectacular Now");
        comingSoon.add("The Canyons");
        comingSoon.add("Europa Report");
        listDataChild.put(listDataHeader.get(0), top250); // Header, Child data
        listDataChild.put(listDataHeader.get(1), nowShowing);
        listDataChild.put(listDataHeader.get(2), comingSoon);
    }

    }

错误显示于

listAdapter = new ExplistAdapter(this, listDataHeader, listDataChild);

Answer 1

在构造函数中使用getActivity()而不是这个。 我建议您删除方法onActivityCreated()中的填充数据。由于getActivity()确保仅在调用此方法后返回创建片段的活动。这是根据Android开发人员文档链接：http://developer.android.com/guide/components/fragments.html

因此，删除将数据填充到 onActivityCreated() 并使用 getActivity() 作为传递给适配器的上下文