DatePicker

public class DatepickerActivity extends Activity implements OnClickListener{
    private TextView mDateDisplay;
    private Button mPickDate;
    private int mYear ;
    private int mMonth ;
    private int mDay;

    static final int DATE_DIALOG_ID = 1;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        mDateDisplay = (TextView) findViewById(R.id.dateDisplay);
        mPickDate = (Button) findViewById(R.id.pickDate);

        mPickDate.setOnClickListener(this);

        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();

    }
    private void updateDisplay() {
        // TODO Auto-generated method stub
         mDateDisplay.setText(
                    new StringBuilder()
                            // Month is 0 based so add 1
                            .append(mMonth+1).append("-")
                            .append(mDay).append("-")
                            .append(mYear).append(" "));


    }
    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        showDialog(DATE_DIALOG_ID);

    }
     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();
                    }
                };

                @Override
                protected Dialog onCreateDialog(int id) {
                    switch (id) {
                    case DATE_DIALOG_ID:
                        return new DatePickerDialog(this,
                                    mDateSetListener,
                                    mYear, mMonth, mDay);
                    }
                    return null;
                }
}