我有一个片段,当按下按钮时,按钮应显示进度对话框并执行包含AsyncTask的方法,但是当我按下按钮时,Progess对话框不会出现在屏幕上,但执行了异步任务。这是片段的代码
public class ParcheggiaFragment extends Fragment {
private Button button;
ProgressDialog progressDialog1;
SharedPreferences prefs;
HttpGetNoleggio httpGetNoleggio;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
final View layout = inflater.inflate(R.layout.fragment_parcheggia, container, false);
button = (Button) layout.findViewById(R.id.button);
prefs = this.getActivity().getSharedPreferences(Keys.SHARED_PREFERENCES, Context.MODE_PRIVATE);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
progressDialog1.show();
int a = checkNoleggioCompletato();
FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.frame_principale, new ResultFragment());
fragmentTransaction.commit();
}
});
return layout;
}
private int checkNoleggioCompletato() {
final int id = prefs.getInt(Keys.ID_UTENTE, -1);
Integer[] noleggio;
int idNoleggio = -1;
try {
String str = "here i put the url that i have to use" + id;
URL url = new URL(str);
noleggio = httpGetNoleggio.execute(url).get();
idNoleggio = noleggio[0];
int idBici = noleggio[1];
int noleggioResult = idNoleggio;
} catch (MalformedURLException | ExecutionException | InterruptedException e) {
e.printStackTrace();
}
return idNoleggio;
}
@Override
public void onStart() {
progressDialog1 = new ProgressDialog(this.getActivity());
progressDialog1.setIndeterminate(true);
super.onStart();
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
httpGetNoleggio = new HttpGetNoleggio(this.getActivity());
}
@Override
public void onResume() {
super.onResume();
}
}
代码似乎是正确的,我无法理解为什么ProgressDialog没有出现。
HttpNoleggio
是另一个扩展AsyncTask并实现doInBackground方法的类
答案 0 :(得分:0)
根据您的代码,您将在ParcheggiaFragment中显示进度条,然后使用ResultFragment替换此片段。由于ResultFragment替换了ParcheggiaFragment,因此不显示进度条。只需评论以下代码:
FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.frame_principale, new ResultFragment());
fragmentTransaction.commit();
然后,进度条将可见。