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 Self-Destructing Message Android App Using Fragments for Tabs Understanding the Rest of the Pieces

Ruggiero A
Ruggiero A
8,534 Points

I don't understand the question

"We have a Button (mDeleteButton) in our Fragment class below. Set it to the button in the layout with the ID of 'deleteButton'."

What should I do instead of what I did? Please explain

PhotoFragment.java
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;

public class PhotoFragment extends Fragment {

    public Button mDeleteButton;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
      mDeleteButton = (Button) findViewById(R.id.deleteButton);
        View rootView = inflater.inflate(R.layout.fragment_photo, container, false);
        return rootView;
    }
}
MainActivity.java
import android.app.ActionBar;
import android.app.Activity;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.util.Log;

public class MainActivity extends Activity implements ActionBar.TabListener {

    public static final String TAG = MainActivity.class.getSimpleName();

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {

    }

    @Override
    public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {

    }

    @Override
    public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {

    }
}

2 Answers

Jack Middlebrook
Jack Middlebrook
19,746 Points

Does your onCreateView look like below?

View rootView = inflater.inflate(R.layout.fragment_photo, container, false);

mDeleteButton = (Button) rootView.findViewById(R.id.deleteButton);

return rootView;

Ruggiero A
Ruggiero A
8,534 Points

No it didn't, looks like I missed rootView. before findViewById. Thanks now it works!

Jack Middlebrook
Jack Middlebrook
19,746 Points

You need to call findViewById() from the View rootView. In your case you need to move the Button assignment below View rootView = inflater.inflate(R.layout.fragment_photo, container, false); and then call mDeleteButton = (Button) rootView.findViewById(R.id.deleteButton);

Ruggiero A
Ruggiero A
8,534 Points

Still it gives the same error