我的情况是我的对话框不显示在我的asyncTask中。 下面的代码是我的AsyncTask在android studio中显示和隐藏对话框
private class AsyncCallListWS extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
Log.i(TAG, "--------------------------------------------------");
Log.i(TAG, "pending ws: onPreExecute");
showLoadingDialog();
}
@Override
protected Void doInBackground(Void... params) {
Log.i(TAG, "pending ws: doInBackground");
//listDataParent = new ArrayList<Tn_Parent>();
listPending();
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
Log.i(TAG, "Call pending ws: onPostExecute");
dismissLoadingDialog();
//Log.i(TAG, "I am not up there "+status.toString());
if(getContext()!=null) {
//adapter = new Tn_ListViewAdapter(getActivity(), newList, selectAll);
//listView.setAdapter(adapter);
lvAdapter = new Tn_ListViewAdapter(getActivity(), lvList, selectAll);
listView.setAdapter(lvAdapter);
// .............. below is not needed .....................
//listAdapter = new Tn_ExpandableAdapter(listDataParent,getContext(), selectAll);
//expListView.setAdapter(listAdapter);
}
}
}
而下面是我的对话框代码。该对话在其他课程中运作良好。
public void showLoadingDialog() {
if (bar == null) {
bar = new ProgressDialog(getActivity());
bar.setMessage(getString(R.string.loading_message));
//bar.setCanceledOnTouchOutside(getRetainInstance());
bar.setCanceledOnTouchOutside(false);
}
bar.show();
}
public void dismissLoadingDialog() {
if (bar != null && bar.isShowing()) {
bar.dismiss();
}
}
我真的很想知道有什么问题。当我在onCreateView()中放置showLoadingDialog()时,会出现对话框,但问题在于,如果我把它放在onCreateView()中,对话框不会消失。请帮忙。
bar = new ProgressDialog(getActivity());这里采取上下文的对象,并在函数中传递它,当你在异步调用它通过上下文 –
请搜索隐藏/显示进度栏的方法,而不是问问题。你会很容易地得到代码片段 –