Error popping up while setting on click listner in spinners

Im new to android and searched a lot regarding this problem but couldnt find solution,im getting this error while setting on click listner option on the spinner options,please help me in solving this error though its a small one.

Error

The method setOnItemSelectedListener(AdapterView.OnItemSelectedListener) in the type AdapterView is not applicable for the arguments (MainActivity)

 #MainActivity.java
 package com.example.spinners;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
 import android.view.MenuItem;
  import android.widget.ArrayAdapter;
 import android.widget.Spinner;


  public class MainActivity extends ActionBarActivity {

   @Override
   protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Spinner spinner = (Spinner) findViewById(R.id.spinner1);
    spinner.setOnItemSelectedListener(this);
 // Create an ArrayAdapter using the string array and a default spinner layout
 ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,
         R.array.planets_array, android.R.layout.simple_spinner_item);
 // Specify the layout to use when the list of choices appears
 adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
 // Apply the adapter to the spinner
 spinner.setAdapter(adapter);
 ;

  }
 }

activity_main.xml

 <RelativeLayout xmlns:android="http://ift.tt/nIICcg"
xmlns:tools="http://ift.tt/LrGmb4"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.spinners.MainActivity" >

<Spinner
    android:id="@+id/spinner1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"
    android:layout_marginTop="110dp" />

 </RelativeLayout>