我有一个片段,显示日历月视图,每个日期由运行时的某些逻辑决定。由于片段加载需要一些时间,我想显示一个进度条。由于进度条本身是片段视图的一部分,因此如何在asynctask完成前显示它。片段视图根据放置在asynctask中的逻辑创建。片段视图加载是asynctask的一部分时,如何在片段加载之前显示进度条?
为了清晰起见,显示了一些代码片段。
public class CalendarMonthViewFragment extends Fragment implements OnCalculateMonthlyCompleted {
@BindView(R.id.progressBar) ProgressBar progressBar;
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
@Nullable Bundle savedInstanceState) {
new CalculateMonthlyDataTask(this, progressBar).execute(); //asynctask that decides the view
return inflater.inflate(R.layout.calendar_monthview_fragment, container, false);
}
private class CalculateMonthlyDataTask extends AsyncTask<Void, Void, MonthlyDataResult> {
private OnCalculateMonthlyCompleted listener;
private ProgressBar progressBar;
private CalculateMonthlyDataTask(OnCalculateMonthlyCompleted listener, ProgressBar progressBar) {
this.listener = listener;
this.progressBar = progressBar;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
//progressBar.setVisibility(View.VISIBLE);
}
@Override
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
}
@Override
protected void onPostExecute(MonthlyDataResult monthlyDataResult) {
super.onPostExecute(monthlyDataResult);
//progressBar.setVisibility(View.GONE);
listener.onTaskCompleted(monthlyDataResult);
}
@Override
protected MonthlyDataResult doInBackground(Void... params) {
panchangMonthlyController.calculateMonthlyCalendar();
return panchangMonthlyController.getMonthlyDataResult();
}
}
}
你能推荐一些代码来显示如何完成 – truespan