控件之DatePicker、TimePicker学习

一、DatePicker继承自FrameLayout类，日期选择控件的主要功能是向用户提供包含年、月、日的日期数据并允许用户对其修改。如果要捕获用户修改日期选择控件中的数据事件，需要为DatePicker添加OnDateChangedListener监听器。

二、TimePicker也继承自FrameLayout类。时间选择控件向用户显示一天中的时间（可以为24小时，也可以为AM/PM制），并允许用户进行选择。如果要捕获用户修改时间数据的事件，便需要为TimePicker添加OnTimeChangedListener监听器

例一：

结果如图：

当点击按钮Change the date的时候会弹出对话框设置时间；

代码如下：

main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:orientation="vertical">    <TextView android:id="@+id/dateDisplay"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text=""/>            <Button android:id="@+id/pickDate"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Change the date"/>         <DatePicker android:id="@+id/datePicker" android:foreground="@android:color/background_dark" android:layout_width="wrap_content"        android:layout_height="wrap_content" android:longClickable="true"/></LinearLayout>

HelloDatePickerActivity.java

package learn.test;import java.util.Calendar;import android.app.Activity;import android.app.DatePickerDialog;import android.app.Dialog;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.DatePicker;import android.widget.TextView;public class HelloDatePickerActivity extends Activity {/** Called when the activity is first created. */private TextView mDateDisplay;private Button mPickDate;private int mYear;private int mMonth;private int mDay;//该常量用于标识DatePickerDialogstatic final int DATE_DIALOG_ID = 0;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);// capture our View elementsmDateDisplay = (TextView) findViewById(R.id.dateDisplay);mPickDate = (Button) findViewById(R.id.pickDate);// add a click listener to the button//这里用的是匿名内部类，OnClickListener只是一个接口， 用它来绑定监听器，mPickDate.setOnClickListener(new View.OnClickListener() {public void onClick(View v) {// 些方法会调用 protected Dialog onCreateDialog(int id)showDialog(DATE_DIALOG_ID);}});// get the current datefinal Calendar c = Calendar.getInstance();mYear = c.get(Calendar.YEAR);mMonth = c.get(Calendar.MONTH);mDay = c.get(Calendar.DAY_OF_MONTH);// display the current date (this method is below)updateDisplay();}private void updateDisplay() {mDateDisplay.setText(new StringBuilder()// Month is 0 based so add 1.append(mMonth + 1).append("-").append(mDay).append("-").append(mYear).append(" "));}//这里使用的是匿名内部类，OnDateSetListener只是这个类里面的一个接口，必须实现onDateSet这个类。private DatePickerDialog.OnDateSetListener mDateSetListener = new DatePickerDialog.OnDateSetListener() {public void onDateSet(DatePicker view, int year, int monthOfYear,int dayOfMonth) {mYear = year;mMonth = monthOfYear;mDay = dayOfMonth;updateDisplay();}};@Overrideprotected Dialog onCreateDialog(int id) {switch (id) {case DATE_DIALOG_ID:return new DatePickerDialog(this, mDateSetListener, mYear, mMonth,mDay);}return null;}}

例二：结果如图：

main.xml布局文件

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent">    <DatePicker android:id="@+id/datePicker"         android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center_horizontal"/>    <EditText android:id="@+id/dateEt"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:cursorVisible="false"        android:editable="false"/>    <TimePicker android:id="@+id/timePicker"         android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center_horizontal"/>    <EditText android:id="@+id/timeEt"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:cursorVisible="false"        android:editable="false"/></LinearLayout>

DpTpActivity.java

public class DpTpActivity extends Activity {    private EditText dateEt=null;    private EditText timeEt=null;        @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        dateEt=(EditText)findViewById(R.id.dateEt);        timeEt=(EditText)findViewById(R.id.timeEt);        DatePicker datePicker=(DatePicker)findViewById(R.id.datePicker);        TimePicker timePicker=(TimePicker)findViewById(R.id.timePicker);                Calendar calendar=Calendar.getInstance();        int year=calendar.get(Calendar.YEAR);        int monthOfYear=calendar.get(Calendar.MONTH);        int dayOfMonth=calendar.get(Calendar.DAY_OF_MONTH);        datePicker.init(year, monthOfYear, dayOfMonth, new OnDateChangedListener(){            public void onDateChanged(DatePicker view, int year,                    int monthOfYear, int dayOfMonth) {                dateEt.setText("您选择的日期是："+year+"年"+(monthOfYear+1)+"月"+dayOfMonth+"日。");            }                    });                timePicker.setOnTimeChangedListener(new OnTimeChangedListener(){            public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {                timeEt.setText("您选择的时间是："+hourOfDay+"时"+minute+"分。");            }                    });    }}