How can I add new button in date picker widget in android?

Just add a neutral button.

DatePickerDialog dialog = new DatePickerDialog(context, 0, callback, year, month, day);dialog.setButton(DialogInterface.BUTTON_NEUTRAL, "Name", new DialogInterface.OnClickListener() {    @Override    public void onClick(DialogInterface dialog, int which) {        //Your code    }});

Simply create this class!

import android.app.DatePickerDialog;import android.content.Context;public class DatePickerWithNeutral extends DatePickerDialog {    public DatePickerWithNeutral(Context context, OnDateSetListener callBack,                            int year, int monthOfYear, int dayOfMonth) {        super(context, 0, callBack, year, monthOfYear, dayOfMonth);        setButton(BUTTON_POSITIVE, ("Ok"), this);        setButton(BUTTON_NEUTRAL, ("Something"), this); // ADD THIS        setButton(BUTTON_NEGATIVE, ("Cancel"), this);    }}

Then use this to add functionality to it!

date.getButton(AlertDialog.BUTTON_NEUTRAL).setOnClickListener(        new View.OnClickListener() {    @Override    public void onClick(View view) {        Toast.makeText(getApplicationContext(), "Neutral Button Clicked!",             Toast.LENGTH_LONG).show();    }});

Looks like this

Enjoy :)

This is how I implemented the "Clear" button in my app. When the user clicks Clear, the year/month/day values are all 0. You can use onDateSet() in your app for both the Set button and Clear button this way.

I referenced the Android source code (\frameworks\base\core\java\android\app\DatePickerDialog.java).

I also used the help of esilver.

public class DatePickerDialogPlus extends DatePickerDialog {    private final DatePicker mDatePicker;    private final OnDateSetListener mCallBack;    /**     * @param context The context the dialog is to run in.     * @param callBack How the parent is notified that the date is set.     * @param year The initial year of the dialog.     * @param monthOfYear The initial month of the dialog.     * @param dayOfMonth The initial day of the dialog.     */    public DatePickerDialogPlus(Context context, OnDateSetListener callBack,             int year, int monthOfYear, int dayOfMonth) {        super(context, 0, callBack, year, monthOfYear, dayOfMonth);        mCallBack = callBack;        Context themeContext = getContext();        setButton(BUTTON_POSITIVE,             themeContext.getText(R.string.datePicker_setButton), this);        setButton(BUTTON_NEUTRAL,             themeContext.getText(R.string.datePicker_clearButton), this);        setButton(BUTTON_NEGATIVE,             themeContext.getText(R.string.datePicker_cancelButton), null);        setIcon(0);        setTitle(R.string.datePicker_title);        LayoutInflater inflater = (LayoutInflater)             themeContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);        View view = inflater.inflate(R.layout.date_picker_dialog, null);        setView(view);        mDatePicker = (DatePicker) view.findViewById(R.id.datePicker);        mDatePicker.init(year, monthOfYear, dayOfMonth, this);    }    @Override    public void onClick(DialogInterface dialog, int which) {        if (mCallBack != null) {            if (which == BUTTON_POSITIVE) {                mDatePicker.clearFocus();                mCallBack.onDateSet(mDatePicker, mDatePicker.getYear(),                     mDatePicker.getMonth(), mDatePicker.getDayOfMonth());            } else if (which == BUTTON_NEUTRAL) {                mDatePicker.clearFocus();                mCallBack.onDateSet(mDatePicker, 0, 0, 0);            }        }    }}