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[英]notifyDataSetChanged doesn't work when i am reading from sqlite
[英]notifyDataSetChanged() doesn't work
我昨天遇到了这个问题:这里有一个服务器返回的列表,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,我添加了一个项,然后调用notifyDataSetChanged()不起作用,另一种情况是当我更改了hashmap中的值和notifyDataSetChanged()时,它也没有刷新。而且我确定数据已更改成功。
它在A活动中显示,而更改的数据在B活动中。
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));
}
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);
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