Java 在listFragment内实现OnScrollListener

我在ListFragment中实现了OnScrollListener接口，我想在列表的最后一个元素可见但不起作用时更改文本。我没有找到类似问题的示例（ListFragment中的OnScrollListener）。我的例子是：

public class MyListFragment1 extends ListFragment implements OnScrollListener {
  public View view;

public class MyListAdapter extends ArrayAdapter<String> {
    Context myContext;
    List<String> lista;
    public MyListAdapter(Context context, int textViewResourceId,
            List<String> objects) {
        super(context, textViewResourceId, objects);
        myContext = context;
        lista = objects;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        //return super.getView(position, convertView, parent);

        LayoutInflater inflater = 
                (LayoutInflater)myContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View row=inflater.inflate(R.layout.row, parent, false);
        TextView label=(TextView)row.findViewById(R.id.month);
        label.setText(lista.get(position));
        ImageView icon=(ImageView)row.findViewById(R.id.icon);

        //Customize your icon here
        icon.setImageResource(R.drawable.ic_launcher);

        return row;
    }



}



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

    /*
    ListAdapter myListAdapter = new ArrayAdapter<String>(
            getActivity(),
            android.R.layout.simple_list_item_1,
            month);
    setListAdapter(myListAdapter);
    */
    List<String> lista = new ArrayList<String>();

    lista.add("January");
    lista.add("February");
    lista.add("March");
    lista.add("April");
    lista.add("May");
    lista.add("June");
    lista.add("July");
    lista.add("August");
    lista.add("September");
    lista.add("October");
    lista.add("November");
    lista.add("December");

    MyListAdapter myListAdapter = 
            new MyListAdapter(getActivity(), R.layout.row, lista);
    setListAdapter(myListAdapter);

}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    view = inflater.inflate(R.layout.listfragment1, container, false);

    changeText("jestem tutaj");

    return view;
}
private void changeText(String txt){
    TextView nowy = (TextView)view.findViewById(R.id.article);
    nowy.setText(txt);
}

@Override
public void onListItemClick(ListView l, View v, int position, long id) {
    Toast.makeText(
            getActivity(), 
            getListView().getItemAtPosition(position).toString(), 
            Toast.LENGTH_LONG).show();
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
        int visibleItemCount, int totalItemCount) {

    if (++firstVisibleItem + visibleItemCount > totalItemCount) {
        changeText("something");
    }

}

@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
    // TODO Auto-generated method stub

}

---

编辑2：我尝试过findViewById，但它不太管用。…

您已经实现了OnScrollListener，但尚未将其附加到ListView

getListView().setOnScrollListener(this);

---

将此添加到onCreateView方法中。

出现此错误是因为您试图在尚未创建Listview时访问Listview

原因：java.lang.IllegalStateException:内容视图尚未打开 创造

Listview实际上是由onCreateView方法的最后一行创建的，该行通常如下所示：

return inflater.inflate(R.layout.fragment_list, container, false);

解决方案是从onActivityCreated方法访问列表，该方法在onCreateView方法之后执行

    @Override
    public void onActivityCreated (Bundle savedInstanceState){
        // Always call the superclass so it can save the view hierarchy state
        super.onCreate(savedInstanceState);

        getListView().setOnScrollListener(this);
    }

---

我做到了，但现在我的应用程序“不幸的是，应用程序已经停止”，我在我的帖子中添加了一个日志。看来你不应该在那个时候这么做。将其移动到on resume:）我只覆盖onResume“@override public void onResume（）{super.onResume（）；}”和我的应用程序“emulator-5554已断开连接！取消这很奇怪，但事实上你必须设置onScrollListener。就我个人而言，我不使用ListFragment，我更喜欢使用普通片段并自己构建它。防止像这样的意外行为^^您需要将其添加到onActivityCreated（Bundle savedInstanceState）

    @Override
    public void onActivityCreated (Bundle savedInstanceState){
        // Always call the superclass so it can save the view hierarchy state
        super.onCreate(savedInstanceState);

        getListView().setOnScrollListener(this);
    }