Question

根据官方Android Dev guide，当用户点击此按钮时，系统会调用以下方法：

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

但是，当我在片段活动中尝试此操作时，它会以红色显示TimePickerFragment。并提示TimePickerFragment()无法解决。

这些是与TimePicker相关的导入：

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;

当我为DatePicker尝试此操作时，DatePickerFragment可以正常工作。

Answer 1

您正在使用 getSupportFragmentManager ，所以

<强>不要

import android.support.v4.app.DialogFragment;

<强>唐＆＃39;吨

import android.app.DialogFragment;

Answer 2

您需要将TimepickerFragment扩展为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;
}
}

然后尝试使用以下代码创建TimePickerFragment对话框。

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

TimePickerFragment不起作用

2 个答案: