Ndtyjky

I write this code to show time in my project when I run the app stop working. However, when I delete show method program works without anything shown when I press the Button

any help please

this is the code

public class AlarmFragment extends Fragment implements 

    TimePickerDialog.OnTimeSetListener{

    private Button clockBtn;

    private TextView time;

 public AlarmFragment() {

    // Required empty public constructor

}





@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container,

                         Bundle savedInstanceState) {

    // Inflate the layout for this fragment

    View view= inflater.inflate(R.layout.fragment_alarm, container, false);

    time = view.findViewById(R.id.alarm_time);

    clockBtn= view.findViewById(R.id.clock_btn);

    clockBtn.setOnClickListener(new View.OnClickListener() {

        @Override

        public void onClick(View v) {



            DialogFragment clock= new TimeClock();

              ///////////show method /////////

             clock.show(getActivity().getSupportFragmentManager(),"Time Picker");





        }

    });

    return view;

}

  @Override

     public void onTimeSet(TimePicker view, int hourOfDay, int minute) {

        time.setText("Time:" + hourOfDay +" : "+minute);

      }}

this is TimeClock Fragment

import android.app.Dialog;

import android.app.TimePickerDialog;

import android.os.Bundle;

import android.support.annotation.NonNull;

import android.support.annotation.Nullable;

import android.support.v4.app.DialogFragment;

import java.util.Calendar;



public class TimeClock extends DialogFragment {

@NonNull

@Override

public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {

    Calendar c = Calendar.getInstance();

    int hour = c.get(Calendar.HOUR_OF_DAY);

    int minute = c.get(Calendar.MINUTE);

  return new TimePickerDialog(getActivity(), (TimePickerDialog.OnTimeSetListener) getActivity(), hour, minute, android.text.format.DateFormat.is24HourFormat(getActivity()));

    }

}

Edit:- so I changed the return statement above, then it works.But onTimeSet method in AlarmFragment did not executed
I did it as follow:-

Activity activity = new AlarmFragment().getActivity();



        return new TimePickerDialog(getActivity(), (TimePickerDialog.OnTimeSetListener)activity, hour, minute, android.text.format.DateFormat.is24HourFormat(getActivity())); 

In the Activity that hosts your AlarmFragment, you must implement TimePickerDialog.OnTimeSetListener.

For example:

public class MainActivity implements TimePickerDialog.OnTimeSetListener {



    ...



    @Override

    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {

        Toast.makeText(this, "chosen hour of day: " + hourOfDay, Toast.LENGTH_LONG).show();

    }

}

You're getting a ClassCastException because your getActivity is not a TimePickerDialog.OnTimeSetListener, but your AlarmFragment is:

// this is where it fails, change this line, do not copy

return new TimePickerDialog(getActivity(), (TimePickerDialog.OnTimeSetListener) getActivity(), hour, minute, android.text.format.DateFormat.is24HourFormat(getActivity()));

You can refactor your TimeClock class to delegate the listener:

public class TimeClock extends DialogFragment {



    private TimePickerDialog.OnTimeSetListener listener;



    public void setOnTimeSetListener(TimePickerDialog.OnTimeSetListener listener) {

        this.listener = listener;

    }



    @NonNull

    @Override

    public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {

        Calendar c = Calendar.getInstance();

        int hour = c.get(Calendar.HOUR_OF_DAY);

        int minute = c.get(Calendar.MINUTE);

        // Now delegates the listener to the constructor

        return new TimePickerDialog(getActivity(), listener, hour, minute, android.text.format.DateFormat.is24HourFormat(getActivity()));

    }

}

And set your listener before TimeClock.show:

DialogFragment clock= new TimeClock();

clock.setOnTimeSetListener(this);

clock.show(getActivity().getSupportFragmentManager(), "Time Picker");