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

I get these errors everytime I try to run it.

Error:(21, 59) error: cannot find symbol variable showFactButton

Error:Execution failed for task ':app:compileDebugJava'.

Compilation failed; see the compiler error output for details.

my code: package dancompany.factsabouteverything;

import android.app.Activity; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.Button; import android.widget.TextView;

public class FactsAboutEverythingActivity extends Activity {

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

    //Declare our view variables and assign the views from the layout files
    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 fact label with a new fact
            String fact = "Cats sleep 16 hours per day.";
            factLabel.setText(fact);
        }
    };
    showFactButton.setOnClickListener(listener);
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.facts_about_everything, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

}

1 Answer

Your code looks fine, but I think the issue may be in your "activity_facts_about_everything.xml" file. Make sure that the Buttons id is actually assigned to "showFactButton".