java - 如何在 Fragment 中使用 showDialog() 和 DatePickerDialog()？

Question

在一个 Activity 中，我根据选中的单选按钮调用不同的 fragment ，不同的 fragment 打开时包含用户应输入的不同内容。为此，用户必须“设置日期”和“设置时间”。

我正在使用这里的代码... click here .

当我在 Activity 中尝试它时它工作正常..但是当我把代码放在 fragment 中时，

 showDialog(DATE_DIALOG_ID);

和

showDialog(TIME_DIALOG_ID);

有错误

方法 showDialog(int) 未定义类型 new View.OnclickListener(){

和

return new DatePickerDialog(this, datetoperform, currentYear, currentMonth, currentDay);

有错误

构造函数 DatePickerDialog(OrderTypeGeneralOrderFragment, DatePickerDialog.OnDateSetListener, int, int, int) 未定义

和

return new TimePickerDialog(this, timeDate, hour, minute, false);

有错误

构造函数**TimePickerDialog(OrderTypeGeneralOrderFragment, TimePickerDialog.OnTimeSetListener, int, int, boolean)** 未定义

这是我的代码:

package info.androidhive.slidingmenu;

import java.util.Calendar;

import android.os.Bundle;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.app.Fragment;
import android.app.TimePickerDialog;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.DatePicker; 
import android.widget.EditText;
import android.widget.TextView;
import android.widget.TimePicker;

public class OrderTypeGeneralOrderFragment extends Fragment{

    private EditText subjectTextBox;


private int currentYear;
private int currentMonth;
private int currentDay;
static final int DATE_DIALOG_ID = 0;
static final int TIME_DIALOG_ID = 1;
int hour;
int minute;
private Button btDate;
private Button btTime;
private TextView timeDisplay;
private TextView dateDisplay;



            @Override
            public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstancesState)
            {
                return inflater.inflate(R.layout.generalorderfragment, container, false);



            }



            @Override
            public void onActivityCreated(Bundle savedInstanceState){
                super.onActivityCreated(savedInstanceState);


                 Button   btDate  =(Button)  getView().findViewById(R.id.btnDate);
                 btDate.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View view) {
                               showDialog(DATE_DIALOG_ID);
                        }
                    });
                    final Calendar c = Calendar.getInstance();
                    currentYear = c.get(Calendar.YEAR);
                    currentMonth = c.get(Calendar.MONTH);
                    currentDay = c.get(Calendar.DAY_OF_MONTH);


                Button btTime = (Button) getView().findViewById(R.id.btnTime);
                btTime.setOnClickListener(new View.OnClickListener() {
                            @Override
                            public void onClick(View view) {
                                  showDialog(TIME_DIALOG_ID);
                            }
                        });
                        final Calendar d = Calendar.getInstance();
                        hour = d.get(Calendar.HOUR_OF_DAY);
                        minute = d.get(Calendar.MINUTE);


                TextView timeDisplay = (TextView) getView().findViewById(R.id.txtTime);
                TextView dateDisplay = (TextView) getView().findViewById(R.id.txtDate);
                EditText subjectTextBox = (EditText) getView().findViewById(R.id.subjectTextBoxId);





            }













          //--DATE PICKER--//

             // Use the current date as the default date in the picker


            protected Dialog onCreateDialog4(int id) {


                    switch (id) {
                    case DATE_DIALOG_ID:
                        return new DatePickerDialog(this, datetoperform, currentYear, currentMonth, currentDay);
                    case TIME_DIALOG_ID:
                        return new TimePickerDialog(this, timeDate, hour, minute, false);
                    }
                    return null;
                }

               private DatePickerDialog.OnDateSetListener datetoperform = new DatePickerDialog.OnDateSetListener() {

                   public void onDateSet(DatePicker view, int year, int month, int day) {
                     //   if (c1.isChecked()) {

                            dateDisplay.setText("Order will be performed on: "
                                    + (month + 1) + "-" + day + "-" + year +  ".");
                      //  }
                    }



                };


                private TimePickerDialog.OnTimeSetListener timeDate = new TimePickerDialog.OnTimeSetListener() {

                    public void onTimeSet(TimePicker view, int hours, int minutes) {
                        timeDisplay.setText("on " + hours + ":"
                                + minutes + ".");
                    }
                };


              /*  public boolean onCreateOptionsMenu(Menu menu) {
                    // Inflate the menu; this adds items to the action bar if it is present.
                    getMenuInflater().inflate(R.menu.activity_main, menu);
                    return true;
                }*/

                //--//DATE PICKER--//





}

我在想..也许可以把这部分放在

protected Dialog onCreateDialog4(int id) {


                        switch (id) {
                        case DATE_DIALOG_ID:
                            return new DatePickerDialog(this, datetoperform, currentYear, currentMonth, currentDay);
                        case TIME_DIALOG_ID:
                            return new TimePickerDialog(this, timeDate, hour, minute, false);
                        }
                        return null;
                    }

                   private DatePickerDialog.OnDateSetListener datetoperform = new DatePickerDialog.OnDateSetListener() {

                       public void onDateSet(DatePicker view, int year, int month, int day) {
                         //   if (c1.isChecked()) {

                                dateDisplay.setText("Order will be performed on: "
                                        + (month + 1) + "-" + day + "-" + year +  ".");
                          //  }
                        }



                    };


                    private TimePickerDialog.OnTimeSetListener timeDate = new TimePickerDialog.OnTimeSetListener() {

                        public void onTimeSet(TimePicker view, int hours, int minutes) {
                            timeDisplay.setText("on " + hours + ":"
                                    + minutes + ".");
                        }
                    };


                  /*  public boolean onCreateOptionsMenu(Menu menu) {
                        // Inflate the menu; this adds items to the action bar if it is present.
                        getMenuInflater().inflate(R.menu.activity_main, menu);
                        return true;
                    }*/

                    //--//DATE PICKER--//





    }

在调用此 fragment 的 Activity 中。

如果没问题..我将如何称呼这个 fragment 中的那个部分？

Answer 1

您需要获取 Activity 句柄才能调用 showDialog()。尝试调用 getActivity().showDialog()