4

根据我正在处理的应用程序，我需要创建一个列表视图，然后在用户单击每个项目时处理事件。除了列表视图中的第一项外，一切正常。第一次加载列表视图时它不可点击，在我向上或向下滚动列表视图后它可以正常工作。还有一件事，第一次加载列表视图如果我单击第一个项目，然后单击第二个项目，则 toast 消息首先显示第二个项目的名称，然后显示第一个项目的名称。因此，在滚动或单击列表视图之前，列表视图中的第一项是不活动的。这是我的这个片段的代码。知道如何处理吗？

public EyeDiseasesFragment(File diseasesJsonFile) {
    this.diseasesJsonFile = diseasesJsonFile;
    mainUrl = Config.mainUrl;
}

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onActivityCreated(savedInstanceState);

    diseasesList = new ArrayList<Diseases>();

    new LoadContent().execute();

}

@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
    try {
        listener = (MainFragmentController) activity;
    } catch (ClassCastException e) {
        throw new ClassCastException(activity.toString()
                + " must implement OnArticleSelectedListener");
    }
}

@Override
public void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
}

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

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

    mList = (ListView) view.findViewById(R.id.diseases);

    return view;

}

class DiseasesAdapter extends BaseAdapter {

    LayoutInflater inflater;

    public DiseasesAdapter() {
        inflater = (LayoutInflater) getActivity().getSystemService(
                Context.LAYOUT_INFLATER_SERVICE);
    }

    @Override
    public int getCount() {
        return diseasesList.size();
    }

    @Override
    public Diseases getItem(int arg0) {
        return diseasesList.get(arg0);
    }

    @Override
    public long getItemId(int arg0) {
        return arg0;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup arg2) {

        final Diseases item;

        ViewHolder holder;
        if (convertView == null) {
            holder = new ViewHolder();
            convertView = inflater.inflate(R.layout.diseases_item, null);

            holder.title = (TextView) convertView.findViewById(R.id.disease_item_header);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        item = getItem(position);
        holder.title.setText(item.diseaseName);

        convertView.setLayoutParams(new ListView.LayoutParams(
                LayoutParams.MATCH_PARENT, HelperStaticMethods.getDIP(
                        getActivity(), 50)));

        convertView.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {

                listener.onDiseasItemClick(item);

            }
        });

        return convertView;
    }
}

class ViewHolder {
    TextView title;
}

class LoadContent extends AsyncTask<Void, Void, Void> {

    @Override
    protected Void doInBackground(Void... params) {

        setDiseasesInformation(getActivity());

        return null;
    }

    @Override
    protected void onPostExecute(Void result) {
        super.onPostExecute(result);

        mList.setCacheColorHint(Color.TRANSPARENT);
        mList.setDivider(null);
        mList.setVerticalFadingEdgeEnabled(false);
        DiseasesAdapter adapter = new DiseasesAdapter();
        mList.setAdapter(adapter);
    }

    @Override
    protected void onPreExecute() {
        // TODO Auto-generated method stub
        super.onPreExecute();
    }

}

编辑

将下面的代码移动到 convertView 为 Null 的语句中解决了这个问题。

if (convertView == null) {

    // ... after inflating the view
    convertView.setLayoutParams(new ListView.LayoutParams(
                LayoutParams.MATCH_PARENT, HelperStaticMethods.getDIP(getActivity(), 50)));
}
4

1 回答 1

2

你能尝试移动代码吗

convertView.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {

            listener.onDiseasItemClick(item);

        }
    });

里面

if (convertView == null){
.....
}

确保侦听器设置一次。

于 2012-08-23T12:26:53.377 回答