[done] notifyDataSetChanged()不会自动更新ListActivity

Question

我在使用BaseAdapter的notifyDataSetChanged()时遇到了一些麻烦.此方法在refreshItems()中调用,并将更新ListActivity的BaseAdapter.在调用notifyDataSetChanged()之前没有任何反应,直到我使用箭头键向下滚动ListView.不知怎的,修改后的getView()方法也没有被调用.也许你可以给我一个提示 - 谢谢!:)

public class WinampControlClientPlaylist extends ListActivity {

static WinampControlClientPlaylist activity = null;

static EfficientAdapter adapter = null;


static class EfficientAdapter extends BaseAdapter {


    public EfficientAdapter(Context context) {
        mInflater = LayoutInflater.from(context);
    }

    private LayoutInflater mInflater;

    @Override
    public int getCount() {
        return Settings.playlistlength;
    }

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

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        ViewHolder holder;


        if (convertView == null) 
        {
            holder = new ViewHolder();

            convertView = mInflater.inflate(R.layout.listview, null);

            holder.text = (TextView) convertView.findViewById(R.string.playlist_title);
            holder.image = (ImageView) convertView.findViewById(R.string.playlist_play);

            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }


        holder.text.setText(Settings.playlist[position]);

        if (position == Settings.playlistPosition)
        {
            holder.text.setTypeface(null, Typeface.ITALIC);
            holder.image.setVisibility(0);
        }
        else
        {
            holder.text.setTypeface(null, Typeface.NORMAL);
            holder.image.setVisibility(4);
        }


        return convertView;
    }


    static class ViewHolder {
        TextView text;
        ImageView image;
    }

    @Override
    public Object getItem(int position) {
        return Settings.playlist[position];
    }
}




void initialize()
{
    adapter = new EfficientAdapter(this);
    setListAdapter(adapter);

    //registerForContextMenu(getListView());
}


@Override
public void onResume()
{
    super.onResume();

    // REFRESH PLAYLIST
    if (getListAdapter() == null && Settings.playlist != null)
        initialize();
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.playlist);

    activity = this;
}

static void refreshItems()
{
    try {
        adapter.notifyDataSetChanged();
    } catch (Exception e) {}

}

}

Answer 1

我有同样的问题(ListView更新只有当我滚动它,甚至notifyDataSetChanged没有帮助).我这样解决:只是尝试在创建用户界面的线程中进行"视图修改"即

activity.runOnUiThread(new Runnable() {         
        public void run() {
              //do your modifications here

              // for example    
              adapter.add(new Object());
              adapter.notifyDataSetChanged()  
        }
});

Answer 2

正如 Franco 指出的那样，notifyDataSetChanged()用来告诉ListView其适配器的内容已更改，而不是它需要重新绘制自身。您只是更改影响某些内容呈现方式的设置。尝试调用refreshDrawableState来告诉列表重绘。