Android(安卓)DatePicker example

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<Button
android:id="@+id/btnChangeDate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Change Date" />

<TextView
android:id="@+id/lblDate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Current Date (M-D-YYYY): "
android:textAppearance="?android:attr/textAppearanceLarge" />

<TextView
android:id="@+id/tvDate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:textAppearance="?android:attr/textAppearanceLarge" />

<DatePicker
android:id="@+id/dpResult"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />

</LinearLayout>

DatePickerDemoActivity.java

package com.cjp.datepickerdemo;

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.view.View.OnClickListener;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.TextView;

public class DatePickerDemoActivity extends Activity {

private TextView tvDisplayDate;
private DatePicker dpResult;
private Button btnChangeDate;

private int year;
private int month;
private int day;

static final int DATE_DIALOG_ID = 999;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

setCurrentDateOnView();
addListenerOnButton();

}

// display current date
public void setCurrentDateOnView() {

tvDisplayDate = (TextView) findViewById(R.id.tvDate);
dpResult = (DatePicker) findViewById(R.id.dpResult);

final Calendar c = Calendar.getInstance();
year = c.get(Calendar.YEAR);
month = c.get(Calendar.MONTH);
day = c.get(Calendar.DAY_OF_MONTH);

// set current date into textview
tvDisplayDate.setText(new StringBuilder()
// Month is 0 based, just add 1
.append(month + 1).append("-").append(day).append("-")
.append(year).append(" "));

// set current date into datepicker
dpResult.init(year, month, day, null);

}

public void addListenerOnButton() {

btnChangeDate = (Button) findViewById(R.id.btnChangeDate);

btnChangeDate.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {

showDialog(DATE_DIALOG_ID);

}

});

}

@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case DATE_DIALOG_ID:
// set date picker as current date
return new DatePickerDialog(this, datePickerListener,
year, month,day);
}
return null;
}

private DatePickerDialog.OnDateSetListener datePickerListener
= new DatePickerDialog.OnDateSetListener() {

// when dialog box is closed, below method will be called.
public void onDateSet(DatePicker view, int selectedYear,
int selectedMonth, int selectedDay) {
year = selectedYear;
month = selectedMonth;
day = selectedDay;

// set selected date into textview
tvDisplayDate.setText(new StringBuilder().append(month + 1)
.append("-").append(day).append("-").append(year)
.append(" "));

// set selected date into datepicker also
dpResult.init(year, month, day, null);

}
};

}

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