课程内容
1.介绍DatePicker和TimePicker两种实现动态输入日期和事件的功能
2.介绍DatePickerDialog和TimePickerDialog来年耕种实现动态输入日期和事件的对话框
3.介绍两组针对检测日期时间改变的监听器包含：
onDateChangedListener和OnTimeChangedListener
onDateSetListener和OnTimeSetListener
当用户更改了DatePicker里的年、月、日时，将出发OnDateCHangedListener监听器的onDateChange()事件
当用户更改了TimePicker里的时、分时，将出发OnTimeCHangedListener监听器的onTimeChanged事件
当用户更改了DatePickerDialog里的年、月、日时，将出发OnDateSetListener监听器的onDateSet()事件
当用户更改了TimePickerDialog里的时、分时，将出发OnTimeSetListener监听器的onTimeSet()事件
需求功能
默认在标题栏中展示当前日期和事件，通过监听器去获取用户选择日期或事件的结果，并将变更的日期或时间展示在标题栏上
通过setTitle()设置标题。
DatePicker实时更改年、月、日：
datePicker = (DatePicker) findViewById(R.id.datePicker1);
datePicker.init(year, month, day, new OnDateChangedListener() {
@Override
public void onDateChanged(DatePicker view, int year, int monthOfYear,
int dayOfMonth) {
setTitle(String.format("%d-%02d-%02d", year, monthOfYear+1, dayOfMonth));
}
});
TimePicker实时更新时、分：
timePicker = (TimePicker) findViewById(R.id.timePicker1);
timePicker.setOnTimeChangedListener(new OnTimeChangedListener() {
@Override
public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
setTitle(String.format("%02d:%02d", hourOfDay, minute));
}
});
新建一个DatePickerDialog用于展示：
new DatePickerDialog(this, new OnDateSetListener() {
@Override
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
setTitle(String.format("%d-%02d-%02d", year, monthOfYear+1, dayOfMonth));
}
}, year, month, day).show();
新建一个TimePickerDialog用于展示：
new TimePickerDialog(this, new OnTimeSetListener() {
@Override
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
setTitle(String.format("%02d:%02d", hourOfDay, minute));
}
}, hour, minute, true).show();
package com.example.datepickertimepicker;
import java.util.Calendar;
import android.app.DatePickerDialog;
import android.app.DatePickerDialog.OnDateSetListener;
import android.app.TimePickerDialog;
import android.app.TimePickerDialog.OnTimeSetListener;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.widget.DatePicker;
import android.widget.DatePicker.OnDateChangedListener;
import android.widget.TimePicker;
import android.widget.TimePicker.OnTimeChangedListener;
public class MainActivity extends ActionBarActivity {
private DatePicker datePicker;
private TimePicker timePicker;
private Calendar calendar;
private int year;
private int month;
private int day;
private int hour;
private int minute;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
calendar = Calendar.getInstance();
year = calendar.get(Calendar.YEAR);
month = calendar.get(Calendar.MONTH);
day = calendar.get(Calendar.DAY_OF_MONTH);
hour = calendar.get(Calendar.HOUR_OF_DAY);
minute = calendar.get(Calendar.MINUTE);
setTitle(String.format("%d-%02d-%02d %02d:%02d", year, month+1, day, hour, minute));
datePicker = (DatePicker) findViewById(R.id.datePicker1);
datePicker.init(year, month, day, new OnDateChangedListener() {
@Override
public void onDateChanged(DatePicker view, int year, int monthOfYear,
int dayOfMonth) {
setTitle(String.format("%d-%02d-%02d", year, monthOfYear+1, dayOfMonth));
}
});
timePicker = (TimePicker) findViewById(R.id.timePicker1);
timePicker.setOnTimeChangedListener(new OnTimeChangedListener() {
@Override
public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
setTitle(String.format("%02d:%02d", hourOfDay, minute));
}
});
new DatePickerDialog(this, new OnDateSetListener() {
@Override
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
setTitle(String.format("%d-%02d-%02d", year, monthOfYear+1, dayOfMonth));
}
}, year, month, day).show();
new TimePickerDialog(this, new OnTimeSetListener() {
@Override
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
setTitle(String.format("%02d:%02d", hourOfDay, minute));
}
}, hour, minute, true).show();
}
}
MainActivity.java
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<DatePicker
android:id="@+id/datePicker1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TimePicker
android:id="@+id/timePicker1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
activity_main.xml
注意事项：
1.DatePicker对象以init()这个方法来指定DatePicker初始的年、月、日及OnDateCHangedListener()的事件；而TimePicker对象则是直接以setOnTimeCHangedListener()事件来处理事件改变程序要做的操作。
2.DatePickerDialog与TimePickerDialog与前面这两种类型的对象最大的差别在于DatePicker与TImePicker是直接显示在屏幕画面上，而DatePickerDialog与TimePickerDialog对象则是以弹出Dialog的方式来显示。
效果：
