Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

Android Build an Interactive Story App (Retired) User Input Finding Views by IDs

Initialize the member variable mExterminateButton using the findViewById() method. The ID for the button is button1.

Initialize the member variable mExterminateButton using the findViewById() method. The ID for the button is button1. Also you have to cast the findViewByID() with a generic view. I did the beginner course but it has been about 2 months and I'm exactly refreshed on the topic so could you explain what I did wrong and why your way works.

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

public class MainActivity extends Activity {

    protected Button mExterminateButton;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mExterminateButton = (Button) findViewByID(button1);
    }

}

1 Answer

You need to reference the id "button1" using the resources object R, so R.id.button1. There's also a small typo in findViewByID which should be findViewById.