片段中的ListView不显示

Question

我有一个应用程序，其中有多个选项卡；与任何人交互都会调用要显示的片段。不幸的是，当我切换到下面的片段时，我的 listView 没有出现，尽管有问题的列表已被填充。非常感谢您提供的任何帮助。

片段的相关代码：

public class Fragment_1 extends SherlockFragment {
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
    //If time permits, I will try to make a Custom Adapter implemented with a TreeSet
    TreeSet<BlacklistWord> theSet =  MainActivity.getInstance().datasource.GetAllWords();
    ArrayList<String> list = new ArrayList<String>();
    for(BlacklistWord i :theSet){
        System.out.println(i.getWord());
        list.add(i.getWord());
    }
    Collections.sort(list);

    //Making BlackList 
    listView = new ListView(getActivity());
    listView.findViewById(R.id.listview);
    adapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1,  list);
    listView.setAdapter(adapter);
    ((BaseAdapter) listView.getAdapter()).notifyDataSetChanged();
    container.addView(listView);
    return inflater.inflate(R.layout.blacklist, container, false);
    //      return inflater.inflate(R.layout.blacklist, container, false);
}
}

XML 是

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

<ListView
    android:id="@+id/listview"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />
</LinearLayout>

Answer 1

将代码改为（盲编码）：

public class Fragment_1 extends SherlockFragment {

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
    /**
    ** Change the way you get the data. Don't keep references to activities like that.
    **/
    TreeSet<BlacklistWord> theSet =  MainActivity.getInstance().datasource.GetAllWords();
    ArrayList<String> list = new ArrayList<String>();
    for(BlacklistWord i :theSet){
        System.out.println(i.getWord());
        list.add(i.getWord());
    }
    Collections.sort(list);
    View v = inflater.inflate(R.layout.blacklist, container, false);

    listView = view.findViewById(R.id.listview);
    adapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1,  list);
    listView.setAdapter(adapter);
    return view;
}
}

您的列表视图未显示，因为您使用构造函数错误地创建了 ListView，然后您调用了 findViewById（没有任何用处），然后设置适配器，调用通知数据集已更改，最后您'正在返回另一个列表。

Answer 2

这样使用：

public class LListFragment extends ListFragment {

    private String[] line;

    public static final String[] TITLES = { "Henry IV (1)", "Henry V",
            "Henry VIII", "Richard II", "Richard III", "Merchant of Venice",
            "Othello", "King Lear" };

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);



        ListView listv = getListView();

        setListAdapter(new ArrayAdapter<String>(getActivity(),
                R.layout.scan_row, R.id.textView1, TITLES));
    }
}

---

或者你在 xml 里面有 listview ..

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.llist_layout, container, false);
        // do your view initialization here
        listv = (ListView) view.findViewById(R.id.lineDlist);
        name = (TextView) view.findViewById(R.id.lineName);
        st = (TextView) view.findViewById(R.id.lineSt);


        listv.setAdapter(new ImageAdapter(getActivity(),
                GeneralClass.lineDetails));

        return view;
    }

Answer 3

因为您正在创建一个新的 ListView，并试图在其中找到您的 xml listview 作为一个孩子...

改为使用某事作为；

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

    View view = inflater.inflate(R.layout.blacklist, container, false);

    ListView listview = (ListView) view.findViewById(R.id.listview);

    //Making BlackList 
    adapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1,  list);
    listView.setAdapter(adapter);
    ((BaseAdapter) listView.getAdapter()).notifyDataSetChanged();
    container.addView(listView);

    return view;
}