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

Posted by Tasokwa Namalueso
Tasokwa Namalueso
283 Points

Unable to start activity ComponentInfo{biz.appfarm.funfacts/biz.appfarm.funfacts.FunFacts}: java.lang.ClassCastException

/* Declare view variables and assign the view from the layout file */ final TextView factLabel = (TextView) findViewById(R.id.factTextView); Button showFactButton = (Button) findViewById(R.id.showFactButton); View.OnClickListener listener = new View.OnClickListener() { @Override public void onClick(View view) { // the button was clicked so update the facts String fact = "Ostriches can run faster than "; factLabel.setText(fact); } }; showFactButton.setOnClickListener(listener);

}

1 Answer

Ben Deitch
STAFF
Ben Deitch
Treehouse Teacher
Ben Deitch
Ben Deitch
Treehouse Teacher

Your RelativeLayout has the same id as your button - android:id="@+id/showFactButton"

Try removing the id from your RelativeLayout

Tasokwa Namalueso
Tasokwa Namalueso
283 Points

thank you very much Ben, worked!