Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

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

Posted by Austin Alex
Austin Alex
1,679 Points

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

mrben
mrben
8,068 Points
mrben
mrben
8,068 Points

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.