android - Fragment 中的 ListView 不显示

Question

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

fragment 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;
}
}

你的 ListView 没有显示，因为你错误地创建了一个带有构造函数的 ListView，然后你调用了一个 findViewById(它没有任何用处)，然后设置一个适配器，调用通知数据集已更改，最后你'正在返回另一个列表。