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[操作系统]Android中DatePicker与TimePicker用法讲解(包括DatePickerDialog与TimePickerDialog)


实现效果:将DatePicker和TimePicker修改的日期和时间实时显示在程序标题栏上。

1.通过DatePicker和TimePicker来实现

布局为main.

<??><LinearLayout ="http://schemas.android.com/apk/res/android"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:orientation="vertical" >  <DatePicker    android:id="@+id/datePicker"    android:layout_width="match_parent"    android:layout_height="wrap_content" />  <TimePicker    android:id="@+id/timePicker"    android:layout_width="match_parent"    android:layout_height="wrap_content" /></LinearLayout>


MainActivity.java

import java.util.Calendar;import android.support.v7.app.ActionBarActivity;import android.app.DatePickerDialog;import android.app.DatePickerDialog.OnDateSetListener;import android.app.TimePickerDialog;import android.app.TimePickerDialog.OnTimeSetListener;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.widget.DatePicker;import android.widget.DatePicker.OnDateChangedListener;import android.widget.TimePicker;import android.widget.TimePicker.OnTimeChangedListener;public class MainActivity extends ActionBarActivity {  private TimePicker timePicker;  private DatePicker datePicker;  private Calendar cal;  private int year, month, day;  private int hour, minute;    @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.main);        //获取日历的一个对象    cal = Calendar.getInstance();        //获取年月日时分秒的信息    year = cal.get(Calendar.YEAR);    //month从0开始计算(一月month = 0)    month = cal.get(Calendar.MONTH)+1;    day = cal.get(Calendar.DAY_OF_MONTH);    hour = cal.get(Calendar.HOUR_OF_DAY);    minute = cal.get(Calendar.MINUTE);        //设置标题    setTitle(year+"-"+month+"-"+day+" "+hour+":"+minute);        datePicker = (DatePicker) findViewById(R.id.datePicker);    timePicker = (TimePicker) findViewById(R.id.timePicker);        //datePicker的初始化    datePicker.init(year, cal.get(Calendar.MONTH), day, new OnDateChangedListener() {      @Override      public void onDateChanged(DatePicker view, int year, int monthOfYear,int dayOfMonth) {        //monthOfYear从0计算        setTitle(year+"-"+(monthOfYear+1)+"-"+dayOfMonth);      }    });        timePicker.setOnTimeChangedListener(new OnTimeChangedListener() {      @Override      public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {        setTitle(hourOfDay+":"+minute);      }    });
  }
}

首先建立Calendar对象来获取当前的系统时间和日期,然后设置在程序标题栏上,注意cal.get(Calendar.MONTH)返回的值从0开始,即返回0时代表一月。

DatePicker初始化调用public void init(int year, int monthOfYear, int dayOfMonth, OnDateChangedListener onDateChangedListener),最后一个参数为DatePicker的监听器。TimePicker直接设置监听器。



运行截图 

更改DatePicker

更改TimePicker

2.使用Dialog,更加美观

布局为main.

 

<??><LinearLayout ="http://schemas.android.com/apk/res/android"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:orientation="vertical" ></LinearLayout>

 

没有加入任何控件

 

MainActivity.java

import java.util.Calendar;import android.support.v7.app.ActionBarActivity;import android.app.DatePickerDialog;import android.app.DatePickerDialog.OnDateSetListener;import android.app.TimePickerDialog;import android.app.TimePickerDialog.OnTimeSetListener;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.widget.DatePicker;import android.widget.DatePicker.OnDateChangedListener;import android.widget.TimePicker;import android.widget.TimePicker.OnTimeChangedListener;public class MainActivity extends ActionBarActivity {private Calendar cal;  private int year, month, day;  private int hour, minute;    @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.main);        //获取日历的一个对象    cal = Calendar.getInstance();        //获取年月日时分秒的信息    year = cal.get(Calendar.YEAR);    //month从0开始计算(一月month = 0)    month = cal.get(Calendar.MONTH)+1;    day = cal.get(Calendar.DAY_OF_MONTH);    hour = cal.get(Calendar.HOUR_OF_DAY);    minute = cal.get(Calendar.MINUTE);        //设置标题    setTitle(year+"-"+month+"-"+day+" "+hour+":"+minute);    //日历选择器的对话框形式    new DatePickerDialog(this, new OnDateSetListener() {      @Override      public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {        setTitle(year+"-"+(monthOfYear+1)+"-"+dayOfMonth);      }    },year, cal.get(Calendar.MONTH), day).show();         //时间选择器的对话框形式(最后一个参数is24HourView,是否为24小时制)    new TimePickerDialog(this, new OnTimeSetListener() {      @Override      public void onTimeSet(TimePicker view, int hourOfDay, int minute) {        setTitle(hourOfDay+":"+minute);      }    }, hour, minute, true).show();  }  }

使用匿名类的方式,直接创建DatePickerDialog和TimePickerDialog对象,构造方法如下

public DatePickerDialog(Context context, OnDateSetListener callBack, int year, int monthOfYear, int dayOfMonth)

public TimePickerDialog(Context context, OnTimeSetListener callBack, int hourOfDay, int minute, boolean is24HourView)

直接在构造方法中使用匿名内部类的方法添加监听器,is24HourView是个boolean类型的值,来表示是否使用24小时制。

 

运行截图

总结:

注意使用cal.get(Calendar.MONTH)得到的值会比真实的月份值小1,在setTitle时需要加1,而在传入到DatePicker的初始化方法和DatePickerDialog的构造方法时应该直接传入。

建议在这两个方法内直接写cal.get(Calendar.MONTH),不要用自定义变量month。