Date Picker in android

Open “res/layout/main.xml” file, add date picker, label and button for demonstration.

File : res/layout/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>

File : MyAndroidAppActivity.java


package com.mkyong.android;
 
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 MyAndroidAppActivity 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);
 
  }
 };
 
}



Run the application.

1. Result, “date picker” and “textview” are set to current date.



2. Click on the “Change Date” button, it will prompt a date picker component in a dialog box via DatePickerDialog.



3. Both “date picker” and “textview” are updated with selected date.