$Android中日期和時間選擇器的實現

　　創建日期或時間選擇窗口需要彈出Dialog的時候，Activity類的showDialog方法已經棄用了，而推薦使用的是DialogFragment，本文總結一下其具體用法.

　　（一）日期選擇器

　　1、創建MyDatePickerDialog類，繼承自DatePickerDialog類，實現構造方法，重寫onDateChanged方法：

import android.app.DatePickerDialog;
import android.content.Context;
import android.widget.DatePicker;

public class MyDatePickerDialog extends DatePickerDialog {

    public MyDatePickerDialog (Context context, OnDateSetListener callBack,
            int year, int monthOfYear, int dayOfMonth) {
        super(context, callBack, year, monthOfYear, dayOfMonth);
        
        this.setTitle("選擇任務的日期");        
        this.setButton2("取消", (OnClickListener)null);
        this.setButton("確定", this);  //setButton和this參數組合表示這個按鈕是確定按鈕
        
    }

    @Override
    public void onDateChanged(DatePicker view, int year, int month, int day) {
        super.onDateChanged(view, year, month, day);
        this.setTitle("選擇任務的日期");
    }

}

　　注：隱藏日期選擇器的“日”選擇項的方法：在MyDatePickerDialog的構造方法中添加一個參數：代表日期選擇器類型的整型參數，比如0代表年月日都顯示，1表示只顯示年和月等，然后用如下代碼來隱藏“日”選擇項（隱藏年月的方法同理，時間選擇器也同理）：

　　　　 // 獲取當前系統的語言
        Locale locale = context.getResources().getConfiguration().locale;
        String language = locale.getLanguage();
　　　　　　  // 隱藏日選擇欄
            if (language.endsWith("zh")) {
                ((ViewGroup) ((ViewGroup) this.getDatePicker().getChildAt(0))
                        .getChildAt(0)).getChildAt(2).setVisibility(View.GONE);
            } else {
                ((ViewGroup) ((ViewGroup) this.getDatePicker().getChildAt(0))
                        .getChildAt(0)).getChildAt(1).setVisibility(View.GONE);
            }

　　2、創建DatePickerFragment類，繼承自DialogFragment類並實現DatePickerDialog.OnDateSetListener接口，重寫其onCreateDialog和onDateSet方法：

import java.util.Calendar;

import android.app.Dialog;
import android.app.DialogFragment;
import android.os.Bundle;
import android.widget.DatePicker;
import android.app.DatePickerDialog;

public class DatePickerFragment extends DialogFragment implements
        DatePickerDialog.OnDateSetListener {
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        final Calendar c = Calendar.getInstance();
        int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH);
        int day = c.get(Calendar.DAY_OF_MONTH);
        return new MyDatePickerDialog(getActivity(), this, year, month, day);
    }

    @Override
    public void onDateSet(DatePicker view, int year, int month, int day) {

    }

}

　　3、在活動中顯示日期選擇器

　　　　　　  DatePickerFragment datePickerFrg = new DatePickerFragment() {
                @Override
                public void onDateSet(DatePicker view, int year, int month,
                        int day) {
                    Log.d("DateSet","選擇的日期是：" + year +"-" + (month + 1) + "-" + day);                }
            };
            datePickerFrg.show(getFragmentManager(), "datePickerFrg");

 　　效果：

 

　　（二）時間選擇器

　　時間選擇器的使用其實和日期選擇器差不多.

　　1、創建MyTimePickerDialog類，繼承自TimePickerDialog，實現構造方法，重寫onTimeChanged方法：

import android.app.TimePickerDialog;
import android.content.Context;
import android.content.DialogInterface.OnClickListener;
import android.widget.TimePicker;

public class MyTimePickerDialog extends TimePickerDialog {

    public MyTimePickerDialog (Context context, OnTimeSetListener callBack,
            int hourOfDay, int minute, boolean is24HourView) {
        super(context, callBack, hourOfDay, minute, is24HourView);
        
        this.setTitle("選擇任務的時間");        
        this.setButton2("取消", (OnClickListener)null);
        this.setButton("確定", this);  //setButton和this參數組合表示這個按鈕是確定按鈕
    }
    
    @Override
    public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
        super.onTimeChanged(view, hourOfDay, minute);
        this.setTitle("選擇任務的時間");    
    }

}

　　2、創建TimePickerFragment類，繼承自DialogFragment類並實現TimePickerDialog.OnTimeSetListener接口，重寫其onCreateDialog和onTimeSet方法：

public class TimePickerFragment extends DialogFragment implements
        TimePickerDialog.OnTimeSetListener {

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        final Calendar calendar = Calendar.getInstance();
        int hour = calendar.get(Calendar.HOUR_OF_DAY);
        int minute = calendar.get(Calendar.MINUTE);

        return new MyTimePickerDialog(getActivity(), this, hour, minute,
                DateFormat.is24HourFormat(getActivity()));
    }

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

    }
}

　　3、在活動中顯示時間選擇器：

　　　　　　  TimePickerFragment timePickerFrg = new TimePickerFragment() {
                @Override
                public void onTimeSet(android.widget.TimePicker view,
                        int hourOfDay, int minute) {
                    Log.d("TimeSet", "選擇的時間是：" + hourOfDay + ":" + minute);
                };
            };
            timePickerFrg.show(getFragmentManager(), "timePickerFrg");

 　　效果：