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Android Build a Simple Android App (2014) Basic Android Programming Adding the onClick() Method

Unknown class: 'listener'

I am getting an error for an Unknown class: 'listener' when hovering above listener below in newTipButton.setOnClickListener(listener);

What might be causing this? Thanks!


public class ApplicationTest extends ApplicationTestCase<Application> { public ApplicationTest() { super(Application.class); } //add our View variables and assign them the views from the layout file

final TextView factLabel = (TextView) findViewById(R.id.Fact);
Button newTipButton = (Button) findViewById(R.id.newtipbutton);
View.OnClickListener listener = new View.OnClickListener() {
    @Override
    public void onClick(View view) {
    String tip2 = "You should change your air filter every 30 days.";
        factLabel.setText(tip2);
    }
};
newTipButton.setOnClickListener(listener);

}