UI DatePicker (basic)

DatePickerActivity.java

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 DatePickerActivity extends Activity {

	private TextView mDateDisplay;
	private Button mPickDate;
	private int mYear;
	private int mMonth;
	private int mDay;

	static final int DATE_DIALOG_ID = 0;

	  // the callback received when the user "sets" the date in the dialog
    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();
                }
            };
     
	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		// capture our View elements
		mDateDisplay = (TextView) findViewById(R.id.dateDisplay);
		mPickDate = (Button) findViewById(R.id.pickDate);

		// add a click listener to the button
		mPickDate.setOnClickListener(new View.OnClickListener() {
			public void onClick(View v) {
				showDialog(DATE_DIALOG_ID);
			}
		});

		// get the current date
		final 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();
	}
	
	 // updates the date in the TextView
    private void updateDisplay() {
        mDateDisplay.setText(
            new StringBuilder()
                    // Month is 0 based so add 1
                    .append(mMonth + 1).append("-")
                    .append(mDay).append("-")
                    .append(mYear).append(" "));
    }
    
    @Override
    protected Dialog onCreateDialog(int id) {
        switch (id) {
        case DATE_DIALOG_ID:
            return new DatePickerDialog(this,
                        mDateSetListener,
                        mYear, mMonth, mDay);
        }
        return null;
    }
}

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 DatePickerActivity extends Activity {

private TextView mDateDisplay;

private Button mPickDate;

private int mYear;

private int mMonth;

private int mDay;

static final int DATE_DIALOG_ID = 0;

// the callback received when the user "sets" the date in the dialog

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();

}

};

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

// capture our View elements

mDateDisplay = (TextView) findViewById(R.id.dateDisplay);

mPickDate = (Button) findViewById(R.id.pickDate);

// add a click listener to the button

mPickDate.setOnClickListener(new View.OnClickListener() {

public void onClick(View v) {

showDialog(DATE_DIALOG_ID);

}

});

// get the current date

final 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();

}

// updates the date in the TextView

private void updateDisplay() {

mDateDisplay.setText(

new StringBuilder()

// Month is 0 based so add 1

.append(mMonth + 1).append("-")

.append(mDay).append("-")

.append(mYear).append(" "));

}

@Override

protected Dialog onCreateDialog(int id) {

switch (id) {

case DATE_DIALOG_ID:

return new DatePickerDialog(this,

mDateSetListener,

mYear, mMonth, mDay);

}

return null;

}

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=""
        android:textSize="24sp" />

    <Button
        android:id="@+id/pickDate"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Change the date"
        android:textSize="24sp" />

</LinearLayout>

<?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=""

android:textSize="24sp" />

<Button

android:id="@+id/pickDate"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Change the date"

android:textSize="24sp" />

</LinearLayout>