Question

我昨天遇到了这个问题：这里我有一个服务器返回的列表，并且列表中有一个Hashmap列表（List）和一个Hashmap。我有两种情况，一种是当hashmap列表为null时，我在其中添加一个新项，然后调用notifyDataSetChanged（）不起作用，另一种情况是我在hashmap中更改了值，而notifyDataSetChanged（），它也没有刷新。我确定数据已被更改成功。

它显示在A活动中，并在B活动中更改了数据。

活动：

protected List<CommentEntity> mDataList;
protected ListView mListView;
protected BaseListAdapter mAdapter;

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    int position = data.getIntExtra("position", -1);
    if (position > -1) {
        CommentEntity entity = (CommentEntity) data.getSerializableExtra(AppVars.Keys.EXTRA_ENTITY);
        mDataList.set(position, entity); // I want this list update
        mAdapter.notifyDataSetChanged();
    } else {
        // error
    }
}
public class BaseListAdapter extends BaseAdapter {

    @Override
    public int getCount() {
        return mDataList == null ? 0 : mDataList.size();
    }

    @Override
    public Object getItem(int position) {
        return mDataList == null ? null : mDataList.get(position);
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // actually this adapter is written in MyBaseFragment, and the child
        // Fragment will override setupItemView() method.it's working fine
        return setupItemView(position, convertView, parent);
    }
}

B活动：

private CommentEntity mCommentEntity;
// the list below is inside CommentEntity, QuoteEntity is extends HashMap<>.
private List<QuoteEntity> mQuoteList;
private QuoteAdapter mAdapter;
public void update(QuoteEntity newQuote) {
    mQuoteList.add(newQuote);
    mCommentEntity.setReplyRows(mQuoteList);
    mAdapter.notifyDataSetChanged();// This adapter is just working fine.
    setResult(-1, getIntent().putExtra(AppVars.Keys.EXTRA_ENTITY, mCommentEntity));
}

Answer 1

尝试重置listview，而不是使用notifyDataSetChanged（）;

           ListView lv = (ListView)FindViewById(R.id.lv);
           BaseListAdapter aa = new BaseListAdapter(//constructor's parameters);
           lv.setAdapter(aa);

notifyDataSetChanged（）不起作用

1 个答案: