另一个apapter.notifydatasetchanged()不起作用 - android

Question

我一直在使用一种方法来填充适配器如下：

1. 在onCreate(...)中的自定义方法中设置UI组件

//..
mRecentSales = new ArrayList<>();
        recentSaleAdapter = new RecentSaleAdapter(getApplicationContext(), R.layout.row_recent_sale, mRecentSales);
        lvRecentSales.setAdapter(recentSaleAdapter);
//.

2. 在onResume()之后，在不同线程中加载适配器的数据

@Override
public void onLoadingPrepare() {
    super.onLoadingPrepare();
    if (qDaySales == null)
        qDaySales = new ArrayList<>();
    else
        qDaySales.clear();
    if (mRecentSales == null)
        mRecentSales = new ArrayList<>();
    else
        mRecentSales.clear();
}
@Override
public void onLoading() {
    super.onLoading();
    todayIncome = Conversor.asCurrency(presenter.getDaySales());
    performance = presenter.getImprovement(getApplicationContext());
    for (int i = 1; i<= DateTime.now().getDayOfMonth(); i++){
        qDaySales.add(new Entry(i, presenter.getSalesFromDay(i)));
    }
    mRecentSales.addAll(presenter.getRecentSales());
}
@Override
public void onLoadingComplete() {
    super.onLoadingComplete();
    tvTodayIncome.setText(todayIncome);
    tvPerformance.setText(performance);
    setPerformanceChart(qDaySales);
    recentSaleAdapter.notifyDataSetChanged();
}

这是适配器代码：

public class RecentSaleAdapter extends ArrayAdapter<MTicket> {
public RecentSaleAdapter(@NonNull Context context, int resource, @NonNull List objects) {
    super(context, resource, objects);
}
@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
    if (convertView == null){
        convertView = LayoutInflater.from(getContext()).inflate(R.layout.row_recent_sale, null);
    }
    MTicket ticket = getItem(position);
    TextView tvTicketId = (TextView)convertView.findViewById(R.id.tv_ticket_id);
    TextView tvTicketReference = (TextView)convertView.findViewById(R.id.tv_ticket_reference);
    TextView tvTicketTotal = (TextView)convertView.findViewById(R.id.tv_ticket_total);
    if (ticket != null){
        tvTicketId.setText(String.format("# %d", ticket.id));
        tvTicketReference.setText(ticket.ticketReference);
        tvTicketTotal.setText(ticket.maskSaleTotal);
    }
    return convertView;
}
@Override
public long getItemId(int position) {
    MTicket ticket = getItem(position);
    if (ticket != null)
        return ticket.id;
    return -1;
}

}

结果不是我所期望的，因为列表没有显示任何内容。

Answer 1

我最终使用异步任务givin'up。

似乎有一个错误，而Android无法正确处理回调。

这是最终的解决方法：

1. 而不是在onLoading()方法中填充对象列表，而只需调用主线程中的所有必需方法。

   @Override
   protected void onResume() {
       super.onResume();
       setTitle(getPreferenceString(SettingsActivity.KEY_BUSINESS_NAME,
           getString(R.string.set_default_business_name)));
       start(); // <- This will start the Async Task
       mRecentSales.clear();
       mRecentSales.addAll(presenter.getRecentSales());
       recentSaleAdapter.notifyDataSetChanged();
   }