$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：

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("选择任务的日期");
this.setButton2("取消", (OnClickListener)null);
this.setButton("确定", this);  //setButton和this参数组合表示这个按钮是确定按钮

}

@Override
public void onDateChanged(DatePicker view, int year, int month, int day) {
super.onDateChanged(view, year, month, day);
this.setTitle("选择任务的日期");
}

}

　　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）：

　　　　 // 获取当前系统的语言
Locale locale = context.getResources().getConfiguration().locale;
String language = locale.getLanguage();
　　　　　　  // 隐藏日选择栏
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、创建DatePickerFragment类，继承自DialogFragment类并实现DatePickerDialog.OnDateSetListener接口，重写其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、在活动中显示日期选择器

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

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("选择任务的时间");
this.setButton2("取消", (OnClickListener)null);
this.setButton("确定", this);  //setButton和this参数组合表示这个按钮是确定按钮
}

@Override
public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
super.onTimeChanged(view, hourOfDay, minute);
this.setTitle("选择任务的时间");
}

}

　　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：

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、在活动中显示时间选择器：

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

　　效果：