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Start your free trialEli Goodwin
29,502 PointsHandling clicks
I am not sure what I am doing wrong here. Followed the pattern from the lesson, but I cannot figure out to implement the fragment interface.
public class NewsFragment extends Fragment {
public interface NewsListener{
void onNewsItemSelected(int index);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_news, container, false);
return view;
}
}
public class MainActivity extends AppCompatActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
NewsFragment newsFragment = new NewsFragment();
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.add(R.id.placeholder, newsFragment);
fragmentTransaction.commit();
}
}
2 Answers
Ben Deitch
Treehouse TeacherHi Eli! You need to implement the 'NewsListener' interface in your MainActivity class. First, you need to declare that MainActivity does implement the interface:
public class MainActivity extends AppCompatActivity implements NewsFragment.NewsListener {
And then you just need to override the interface's method in MainActivity. Hope that helps!
TERRENCE MAVHUNGA
6,053 Pointspublic class NewsFragment extends Fragment { public interface NewsListener{ void onNewsItemSelected(int index); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_news, container, false); return view; } }
public class MainActivity extends AppCompatActivity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main);
NewsFragment newsFragment = new NewsFragment();
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.add(R.id.placeholder, newsFragment);
fragmentTransaction.commit();
}
public class MainActivity extends AppCompatActivity implements NewsFragment.NewsListener { } }
perpetual makayi
8,441 Pointsthank you it worked
Brenda Catherine Mugadza
3,708 Pointsi have tried the above but i keep getting this error.
./MainActivity.java:1: error: MainActivity is not abstract and does not override abstract method onNewsItemSelected(int) in NewsListener public class MainActivity extends AppCompatActivity implements NewsFragment.NewsListener ^ 1 error
Yvonne Mutangi
4,618 PointsYvonne Mutangi
4,618 Pointscan i have a clear explanation of the code because i am lost
Ben Deitch
Treehouse TeacherBen Deitch
Treehouse TeacherSure!
First we need to create a new interface inside of the NewsFragment class:
Then in MainActivity we implement this interface (which we access through the NewsFragment class) and override the 'onNewsItemSelected' method: