TimePickerFragment Not Working

问题

According to the official Android Dev guide, when the user clicks this button, the system calls the following method:

public void showTimePickerDialog(View v) {
    DialogFragment newFragment = new TimePickerFragment();
    newFragment.show(getSupportFragmentManager(), "timePicker");
}

However, when I try this in my Fragment Activity, it shows TimePickerFragment in red. And prompts that TimePickerFragment() cannot be resolved.

These are my imports related to TimePicker :

import android.app.AlarmManager;
import android.app.DatePickerDialog;
import android.app.DatePickerDialog.OnDateSetListener;
import android.app.Dialog;
import android.app.DialogFragment;
import android.support.v4.app.FragmentActivity;
import android.view.View.OnClickListener;
import android.widget.DatePicker;
import android.widget.TimePicker;
import android.app.TimePickerDialog;

When I try this for DatePicker, the DatePickerFragment works.

回答1:

You are using getSupportFragmentManager ,So

Do

import android.support.v4.app.DialogFragment;

Don't

import android.app.DialogFragment;

回答2:

• You need to extends TimepickerFragment as DialogFragment.

  public class TimepickerFragment extends DialogFragment{
  
  public TimepickerFragment(){
  
  }       
  private TimePickerDialog.OnTimeSetListener callback = new TimePickerDialog.OnTimeSetListener() {
  
  @Override
  public void onTimeSet(TimePicker view, int hourOfDay, int minute) {         
     Log.i("Selected Time - ",  hourOfDay + ":" + minute);
  
  }
  };
  
  public Dialog onCreateDialog(Bundle bundle){
  int hourOfDay = 01;
  int minute = 01;
  boolean is24HourView = false;
  TimePickerDialog timePickerDialog = new TimePickerDialog(getActivity(), callback, hourOfDay, minute, is24HourView); 
  return timePickerDialog;
  }
  }
  

• And try your code like below to create TimePickerFragment dialog.

   public void showTimePickerDialog(View v) {
    TimePickerFragment newFragment = new TimePickerFragment();
    newFragment.show(getSupportFragmentManager(), "timePicker");
  }
  

来源：https://stackoverflow.com/questions/34284389/timepickerfragment-not-working