findViewByIdを使用しようとしたときにフラグメントにエラーが発生しました

Question

FragmentにfindViewByIdを使用するとエラーが発生します。

どうすれば解決できますか？

public class Discover extends Fragment { 

private static final String TAG = "Discover"; 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    // Inflate the layout for this fragment 
    View root = inflater.inflate(R.layout.fragment_discover, container, false); 
    Log.d(TAG, "onCreate: starting."); 
    setupBottomNavigationView(); 
    return root; 
} 

private void setupBottomNavigationView(){ 

    Log.d(TAG, "setupBottomNavigationView: setting up BottomNavigationView"); 
    BottomNavigationViewEx bottomNavigationViewEx = (BottomNavigationViewEx) findViewById(R.id.bottomNavViewBar); 
    BottomNavigationViewHelper.setupBottomNavigationView(bottomNavigationViewEx); 

} 

public void onResume(){ 
    super.onResume(); 

    // Set title bar 
    ((LandingPage) getActivity()) 
      .setActionBarTitle("Discover Photos"); 

    } 

    } 
} 

Answer 1

あなたはfindViewByIdを使用するためのルートビューを使用する必要が

setupBottomNavigationView(View view) { 
    Log.d(TAG, "setupBottomNavigationView: setting up BottomNavigationView"); 
    BottomNavigationViewEx bottomNavigationViewEx = (BottomNavigationViewEx) view.findViewById(R.id.bottomNavViewBar); 
    BottomNavigationViewHelper.setupBottomNavigationView(bottomNavigationViewEx); 

} 

したり、ビューのルートがonCreateView

View root; 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 
     // Inflate the layout for this fragment 
     root = inflater.inflate(R.layout.fragment_discover, container, false); 
     Log.d(TAG, "onCreate: starting."); 

     setupBottomNavigationView(root); 

     return root; 

} 

Answer 2

の上に置くあなたのパラメータでビューを追加します。

を想定すると、このビューid.bottomNavViewBarはこのレイアウトに存在しますlayout.fragment_discoverまたは含ま：

public class Discover extends Fragment { 
View root; 

private static final String TAG = "Discover"; 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
        Bundle savedInstanceState) { 
// Inflate the layout for this fragment 
root = inflater.inflate(R.layout.fragment_discover, container, false); 
Log.d(TAG, "onCreate: starting."); 
setupBottomNavigationView(); 
return root; 
} 

private void setupBottomNavigationView(){ 
Log.d(TAG, "setupBottomNavigationView: setting up BottomNavigationView"); 
BottomNavigationViewEx bottomNavigationViewEx = (BottomNavigationViewEx) root.findViewById(R.id.bottomNavViewBar); 
BottomNavigationViewHelper.setupBottomNavigationView(bottomNavigationViewEx); 

} 

public void onResume(){ 
super.onResume(); 

// Set title bar 
((LandingPage) getActivity()) 
     .setActionBarTitle("Discover Photos"); 

    } 

    } 
} 

は今、あなたはfindViewByIdを使用する必要がある時はいつでも、あなたがこのようなrootビューを使用することができますonCreateView上記のビューのルートで

root.findViewById(R.id.yourview)