由于碎片，Listview 适配器无法正常工作

Question

我认为由于碎片，我需要使用 getActivity() 而不是这个。但它仍然给出了一个致命的错误并且不起作用。请帮忙，提前谢谢...

 public class TabFragment2 extends Fragment {


ListView listView;
String[] ids;

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

 View V = inflater.inflate(R.layout.tab_frag2_layout, container, false);

      _audioModel.LoadModel();
      listView = (ListView)V. findViewById(R.id.lsAudio);
      String[] ids = new String[_audioModel.Audios.size()];
      for (int i= 0; i < ids.length; i++){

          ids[i] = Integer.toString(i+1);
      }

      _audioAdapter adapter = new _audioAdapter(getActivity(),R.layout.audio_item, ids);
      listView.setAdapter(adapter);

这是我的 _audioAdapter.java 代码的一部分

public class _audioAdapter extends ArrayAdapter<String> {

private final Context context;
private final String[] Ids;
private final int rowResourceId;

public _audioAdapter(Context context, int textViewResourceId, String[] objects) {

    super(context, textViewResourceId, objects);

    this.context = context;
    this.Ids = objects;
    this.rowResourceId = textViewResourceId;

}


@Override
public View getView(int position, View convertView, ViewGroup parent) {

    LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    View rowView = inflater.inflate(rowResourceId, parent, false);
    TextView audioName = (TextView) rowView.findViewById(R.id.textAudioName);

Answer 1

我经常和这个问题作斗争！！ 问题出在片段/活动生命周期上 如果片段是您的第一个活动，则在 onCreateView 中，该活动尚不存在... 如果您尝试调试或发布日志猫，我认为错误是 getActivity() 上的 NullPointerException

快速而肮脏的技巧：

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    /* All the code that need getActivity() */
}