Why am I not allowed to use setOnClickListener in this situation?

Question

This makes no sense, I am given an error saying that setOnClickListener can't be applied to MainActivity. But i've made other projects where I've never encountered this problem. What's going on?

public class MainActivity extends ActionBarActivity {

Button button;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    button = ((Button) findViewById(R.id.button));

    button.setOnClickListener(this);

}

Answer 1

You have to declare MainActivity like this:

public class MainActivity extends ActionBarActivity implements View.OnClickListener

and after that you have to override the onClick method in MainActivity

@Override
public void onClick(View v) {
     //do something...
} 

Answer 2

As we can see you havn't implemented the View.OnClickListener on Main activity.. this will be used as MainActivity but the parameter that can be passed is OnClickListener

SideNote: Always try to typecast before you use, this greatly reduce the complications and sometimes takes you to mistakes you are doing.