$Android中日期和时间选择器的实现

　　创建日期或时间选择窗口需要弹出Dialog的时候，Activity类的showDialog方法已经弃用了，而推荐使用的是DialogFragment，本文总结一下其具体用法.

　　（一）日期选择器

　　1、创建MyDatePickerDialog类，继承自DatePickerDialog类，实现构造方法，重写onDateChanged方法：

 1 import android.app.DatePickerDialog;
 2 import android.content.Context;
 3 import android.widget.DatePicker;
 4 
 5 public class MyDatePickerDialog extends DatePickerDialog {
 6 
 7     public MyDatePickerDialog (Context context, OnDateSetListener callBack,
 8             int year, int monthOfYear, int dayOfMonth) {
 9         super(context, callBack, year, monthOfYear, dayOfMonth);
10         
11         this.setTitle("选择任务的日期");        
12         this.setButton2("取消", (OnClickListener)null);
13         this.setButton("确定", this);  //setButton和this参数组合表示这个按钮是确定按钮
14         
15     }
16 
17     @Override
18     public void onDateChanged(DatePicker view, int year, int month, int day) {
19         super.onDateChanged(view, year, month, day);
20         this.setTitle("选择任务的日期");
21     }
22 
23 }

　　注：隐藏日期选择器的“日”选择项的方法：在MyDatePickerDialog的构造方法中添加一个参数：代表日期选择器类型的整型参数，比如0代表年月日都显示，1表示只显示年和月等，然后用如下代码来隐藏“日”选择项（隐藏年月的方法同理，时间选择器也同理）：

 1 　　　　 // 获取当前系统的语言
 2         Locale locale = context.getResources().getConfiguration().locale;
 3         String language = locale.getLanguage();
 4 　　　　　　  // 隐藏日选择栏
 5             if (language.endsWith("zh")) {
 6                 ((ViewGroup) ((ViewGroup) this.getDatePicker().getChildAt(0))
 7                         .getChildAt(0)).getChildAt(2).setVisibility(View.GONE);
 8             } else {
 9                 ((ViewGroup) ((ViewGroup) this.getDatePicker().getChildAt(0))
10                         .getChildAt(0)).getChildAt(1).setVisibility(View.GONE);
11             }

　　2、创建DatePickerFragment类，继承自DialogFragment类并实现DatePickerDialog.OnDateSetListener接口，重写其onCreateDialog和onDateSet方法：

 1 import java.util.Calendar;
 2 
 3 import android.app.Dialog;
 4 import android.app.DialogFragment;
 5 import android.os.Bundle;
 6 import android.widget.DatePicker;
 7 import android.app.DatePickerDialog;
 8 
 9 public class DatePickerFragment extends DialogFragment implements
10         DatePickerDialog.OnDateSetListener {
11     @Override
12     public Dialog onCreateDialog(Bundle savedInstanceState) {
13         final Calendar c = Calendar.getInstance();
14         int year = c.get(Calendar.YEAR);
15         int month = c.get(Calendar.MONTH);
16         int day = c.get(Calendar.DAY_OF_MONTH);
17         return new MyDatePickerDialog(getActivity(), this, year, month, day);
18     }
19 
20     @Override
21     public void onDateSet(DatePicker view, int year, int month, int day) {
22 
23     }
24 
25 }

　　3、在活动中显示日期选择器

1 　　　　　　  DatePickerFragment datePickerFrg = new DatePickerFragment() {
2                 @Override
3                 public void onDateSet(DatePicker view, int year, int month,
4                         int day) {
5                     Log.d("DateSet","选择的日期是：" + year +"-" + (month + 1) + "-" + day);                }
6             };
7             datePickerFrg.show(getFragmentManager(), "datePickerFrg");

　　效果：

　　（二）时间选择器

　　时间选择器的使用其实和日期选择器差不多.

　　1、创建MyTimePickerDialog类，继承自TimePickerDialog，实现构造方法，重写onTimeChanged方法：

 1 import android.app.TimePickerDialog;
 2 import android.content.Context;
 3 import android.content.DialogInterface.OnClickListener;
 4 import android.widget.TimePicker;
 5 
 6 public class MyTimePickerDialog extends TimePickerDialog {
 7 
 8     public MyTimePickerDialog (Context context, OnTimeSetListener callBack,
 9             int hourOfDay, int minute, boolean is24HourView) {
10         super(context, callBack, hourOfDay, minute, is24HourView);
11         
12         this.setTitle("选择任务的时间");        
13         this.setButton2("取消", (OnClickListener)null);
14         this.setButton("确定", this);  //setButton和this参数组合表示这个按钮是确定按钮
15     }
16     
17     @Override
18     public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
19         super.onTimeChanged(view, hourOfDay, minute);
20         this.setTitle("选择任务的时间");    
21     }
22 
23 }

　　2、创建TimePickerFragment类，继承自DialogFragment类并实现TimePickerDialog.OnTimeSetListener接口，重写其onCreateDialog和onTimeSet方法：

 1 public class TimePickerFragment extends DialogFragment implements
 2         TimePickerDialog.OnTimeSetListener {
 3 
 4     @Override
 5     public Dialog onCreateDialog(Bundle savedInstanceState) {
 6         final Calendar calendar = Calendar.getInstance();
 7         int hour = calendar.get(Calendar.HOUR_OF_DAY);
 8         int minute = calendar.get(Calendar.MINUTE);
 9 
10         return new MyTimePickerDialog(getActivity(), this, hour, minute,
11                 DateFormat.is24HourFormat(getActivity()));
12     }
13 
14     @Override
15     public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
16 
17     }
18 }

　　3、在活动中显示时间选择器：

1 　　　　　　  TimePickerFragment timePickerFrg = new TimePickerFragment() {
2                 @Override
3                 public void onTimeSet(android.widget.TimePicker view,
4                         int hourOfDay, int minute) {
5                     Log.d("TimeSet", "选择的时间是：" + hourOfDay + ":" + minute);
6                 };
7             };
8             timePickerFrg.show(getFragmentManager(), "timePickerFrg");

　　效果：