Android DatePickerDialog error

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Java

Mobile

Android

Hello people,

I am making some application and I have some error, which I can not solve, I searched on google but nothing helped me.

I have Main class and "Lasta" class, Lasta is name of class.
In Main class I only have this code:

package com.nemanjapetrovic.ndevelope.lasta;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends Activity 
{
	//Global variable
	Lasta lasta = new Lasta();
	
	//Controls ID's
	Button date,time,search;
	EditText from_station,to_station;

	
	// ------------------ Load ------------------

	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	
		//Controls
		date = (Button)findViewById(R.id.date);
		time = (Button)findViewById(R.id.time);
		search = (Button)findViewById(R.id.search);
		from_station = (EditText)findViewById(R.id.from_station);
		to_station = (EditText)findViewById(R.id.to_station);
		
		date.setText(lasta.get_DATE());
		time.setText(lasta.get_TIME());
	}
	
	public void dateButton_OnClick(View v)
	{
		lasta.DateChange();
		date.setText(lasta.get_DATE());
	}
	
	public void timeButton_OnClick(View v)
	{
		lasta.TimeChange();
		time.setText(lasta.get_TIME());
	}
	
	public void seachButton_OnClick(View v)
	{
		lasta.Search();
	}
}

In another class, Lasta class I have method who creates DatePickerDialog, and also TimePickerDialog.

Here is a code:

package com.nemanjapetrovic.ndevelope.lasta;

import android.app.Activity;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import android.app.DatePickerDialog;
import android.app.TimePickerDialog;
import android.widget.DatePicker;
import android.widget.TimePicker;
import android.os.Bundle;
import android.view.View;

public class Lasta extends Activity
{
	//Global variables
	
	//Variable data for JSON
	private String _STATION_FROM;
	private String _STATION_TO;
	private String _DATE;
	private String _TIME;
	
	//Variable for date/time picker dialog change
	private Calendar nowCalendar = Calendar.getInstance();
	
	
	//------------------ Constructors ------------------
	
	
	//Default constructor
	public Lasta()
	{
		//Set station variables to ""
		this._STATION_FROM = "";
		this._STATION_TO = "";
		//Set date variable
		UpdateDATE();
		//Set time variable
		UpdateTIME();
	}
	
	//Constructor that sets all elements
	public Lasta(String sf, String st, String d, String t)
	{
		this._STATION_FROM = sf;
		this._STATION_TO = st;
		this._DATE = d;
		this._TIME = t;
	}

	
	// ------------------ DateChange ------------------
	 HERE I AM GETTING AN ERROR
	
	//DatePickerDialog.OnDateSetListener
	private DatePickerDialog.OnDateSetListener dateDialog = new DatePickerDialog.OnDateSetListener()
	{
		@Override
		public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth)
		{
			//Set new data
			nowCalendar.set(Calendar.YEAR, year);
			nowCalendar.set(Calendar.MONTH, monthOfYear);
			nowCalendar.set(Calendar.DAY_OF_MONTH, dayOfMonth);
			
			UpdateDATE();
		}
	};

         HERE I AM GETTING AN ERROR
	//Calling from MAIN
	//Method for creating PickerDialog and changing _DATE
	public void DateChange() 
	{
		//This DatePickerDialog calls DatePickerDialog.OnDateSetListener which sets all data for Calendar
		new DatePickerDialog(this, DatePickerDialog.THEME_HOLO_DARK, dateDialog, nowCalendar.get(Calendar.YEAR), nowCalendar.get(Calendar.MONTH), nowCalendar.get(Calendar.DAY_OF_MONTH)).show();	
	}
	
	private void UpdateDATE()
	{
		//Set new _DATE
		SimpleDateFormat df = new SimpleDateFormat("dd/MM/yyyy"); //Formating date
		this._DATE = df.format(this.nowCalendar.getTime());
	}

I am getting an error in method called:

public void DateChange() 
	{
		//This DatePickerDialog calls DatePickerDialog.OnDateSetListener which sets all data for Calendar
		new DatePickerDialog(this, DatePickerDialog.THEME_HOLO_DARK, dateDialog, nowCalendar.get(Calendar.YEAR), nowCalendar.get(Calendar.MONTH), nowCalendar.get(Calendar.DAY_OF_MONTH)).show();	
	}

Here is an error code:
04-18 21:53:14.192: E/AndroidRuntime(31880):

FATAL EXCEPTION: main
04-18 21:53:14.192: E/AndroidRuntime(31880): java.lang.IllegalStateException: Could not execute method of the activity
04-18 21:53:14.192: E/AndroidRuntime(31880):    at android.view.View$1.onClick(View.java:3804)
04-18 21:53:14.192: E/AndroidRuntime(31880):    at android.view.View.performClick(View.java:4439)
04-18 21:53:14.192: E/AndroidRuntime(31880):    at android.widget.Button.performClick(Button.java:139)
04-18 21:53:14.192: E/AndroidRuntime(31880):    at android.view.View$PerformClick.run(View.java:18395)
04-18 21:53:14.192: E/AndroidRuntime(31880):    at android.os.Handler.handleCallback(Handler.java:725)
04-18 21:53:14.192: E/AndroidRuntime(31880):    at android.os.Handler.dispatchMessage(Handler.java:92)
04-18 21:53:14.192: E/AndroidRuntime(31880):    at android.os.Looper.loop(Looper.java:176)
04-18 21:53:14.192: E/AndroidRuntime(31880):    at android.app.ActivityThread.main(ActivityThread.java:5319)
04-18 21:53:14.192: E/AndroidRuntime(31880):    at java.lang.reflect.Method.invokeNative(Native Method)
04-18 21:53:14.192: E/AndroidRuntime(31880):    at java.lang.reflect.Method.invoke(Method.java:511)
04-18 21:53:14.192: E/AndroidRuntime(31880):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
04-18 21:53:14.192: E/AndroidRuntime(31880):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
04-18 21:53:14.192: E/AndroidRuntime(31880):    at dalvik.system.NativeStart.main(Native Method)
04-18 21:53:14.192: E/AndroidRuntime(31880): Caused by: java.lang.reflect.InvocationTargetException
04-18 21:53:14.192: E/AndroidRuntime(31880):    at java.lang.reflect.Method.invokeNative(Native Method)
04-18 21:53:14.192: E/AndroidRuntime(31880):    at java.lang.reflect.Method.invoke(Method.java:511)
04-18 21:53:14.192: E/AndroidRuntime(31880):    at android.view.View$1.onClick(View.java:3799)
04-18 21:53:14.192: E/AndroidRuntime(31880):    ... 12 more
04-18 21:53:14.192: E/AndroidRuntime(31880): Caused by: java.lang.IllegalStateException: System services not available to Activities before onCreate()
04-18 21:53:14.192: E/AndroidRuntime(31880):    at android.app.Activity.getSystemService(Activity.java:4662)
04-18 21:53:14.192: E/AndroidRuntime(31880):    at android.app.Dialog.<init>(Dialog.java:164)
04-18 21:53:14.192: E/AndroidRuntime(31880):    at android.app.AlertDialog.<init>(AlertDialog.java:114)
04-18 21:53:14.192: E/AndroidRuntime(31880):    at android.app.AlertDialog.<init>(AlertDialog.java:110)
04-18 21:53:14.192: E/AndroidRuntime(31880):    at android.app.DatePickerDialog.<init>(DatePickerDialog.java:113)
04-18 21:53:14.192: E/AndroidRuntime(31880):    at com.nemanjapetrovic.ndevelope.lasta.Lasta.DateChange(Lasta.java:99)
04-18 21:53:14.192: E/AndroidRuntime(31880):    at com.nemanjapetrovic.ndevelope.lasta.MainActivity.dateButton_OnClick(MainActivity.java:40)

Sorry for this long question. Thank you!