Question

我正在尝试在DataListFragment中显示新数据（扩展ListFragment）。以下是我在MainActivity中的使用方法：

          CustomArrayAdapter adapter = new CustomArrayAdapter(this);
          adapter.setData1(newContent);
          adapter.notifyDataSetChanged();
          ToFragment.changeAdapter(adapter);

CustomArrayAdapter看起来像：

public class CustomArrayAdapter extends ArrayAdapter<FinalData> {
    private final LayoutInflater mInflater;

    public CustomArrayAdapter(Context context) {
        super(context, android.R.layout.simple_list_item_2);
        mInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    public void setData1(ArrayList<FinalData> data) {
        System.out.println("chch");
        clear();
        System.out.println("chch");
        if (data != null) {
            for (FinalData appEntry : data) {
                add(appEntry);
                System.out.println("chch");
            }
        }
    }

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

        if (convertView == null) {
            view = mInflater.inflate(R.layout.single_item, parent, false);
        } else {
            view = convertView;
        }

        FinalData item = getItem(position);
        if (position % 2 == 0) {
            ((TextView)view.findViewById(R.id.train_info)).setEllipsize(TruncateAt.MARQUEE);
            ((TextView)view.findViewById(R.id.train_info)).setSelected(true);
            ((TextView)view.findViewById(R.id.stations_info)).setEllipsize(TruncateAt.MARQUEE);
            ((TextView)view.findViewById(R.id.stations_info)).setSelected(true);
            ((TextView)view.findViewById(R.id.stations_info)).setText(item.getFullData());
            ((AutoResizeTextView)view.findViewById(R.id.time_info)).setText(item.getShortData());
            ((TextView)view.findViewById(R.id.train_info)).setText(item.getTimeData());

            ((TextView)view.findViewById(R.id.train_info)).setBackgroundColor(Color.parseColor("#6dcaec"));
            ((TextView)view.findViewById(R.id.stations_info)).setBackgroundColor(Color.parseColor("#a8dff4"));
            ((AutoResizeTextView)view.findViewById(R.id.time_info)).setBackgroundColor(Color.parseColor("#6dcaec"));
        } else {
            ((TextView)view.findViewById(R.id.train_info)).setEllipsize(TruncateAt.MARQUEE);
            ((TextView)view.findViewById(R.id.train_info)).setSelected(true);
            ((TextView)view.findViewById(R.id.stations_info)).setEllipsize(TruncateAt.MARQUEE);
            ((TextView)view.findViewById(R.id.stations_info)).setSelected(true);
            ((TextView)view.findViewById(R.id.stations_info)).setText(item.getFullData());
            ((AutoResizeTextView)view.findViewById(R.id.time_info)).setText(item.getShortData());
            ((TextView)view.findViewById(R.id.train_info)).setText(item.getTimeData());

            ((TextView)view.findViewById(R.id.train_info)).setBackgroundColor(Color.parseColor("#cf9fe7"));
            ((TextView)view.findViewById(R.id.stations_info)).setBackgroundColor(Color.parseColor("#ddbcee"));
            ((AutoResizeTextView)view.findViewById(R.id.time_info)).setBackgroundColor(Color.parseColor("#cf9fe7"));
        }
        return view;
    }
}

DataListFragment看起来像：

public class DataListFragment extends ListFragment {   
    CustomArrayAdapter mAdapter;
    public CustomArrayAdapter getAdapter() {
        return mAdapter;
    }
    @Override 
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        setEmptyText("");
        mAdapter = new CustomArrayAdapter(getActivity());
        mAdapter.notifyDataSetChanged();
        setListShown(true);
    }
    public void changeAdapter(CustomArrayAdapter adapter) {
        mAdapter = adapter;
        setListAdapter(adapter);
        mAdapter.notifyDataSetChanged();
        setListShown(true);
    }
    @Override
    public void onListItemClick(ListView l, View v, int position, long id) {
    }
}

我确信newContent不是空的，但是List没有改变，它仍然是空的，没有看到任何东西。怎么办？

UPD：我已经设法让我的程序在线上停止

setListShown(true);

它只是在没有错误的情况下停止，并且在它之后不做任何事情。这很神秘......

Answer 1

您在 notifyDataSetChanged()之前呼叫changeAdapter() ，因此Fragment不会收到有关更改的通知。您应该创建适配器的单个实例并仅调用setListAdapter()一次（很可能在片段的onCreate()中）。然后，在您的活动中，只需在适当的时候致电ToFragment.getListAdapter().notifyDataSetChanged()。

ListFragment数据未显示

1 个答案: