Roboguiceビューインジェクション：RecyclerViewアダプタでカスタムビューをインジェクトすると失敗します

Question

まず、私はRoboguiceを使用しています。

とActivityがあります。 RecyclerView'sアダプター内にカスタムビューを展開しようとしています。私のプロジェクトでRoboguiceを使用しています。

MainActivity.java

@ContentView(R.layout.activity_main) 
public class MainActivity extends AppCompatActivity { 

    @InjectView(R.id.recycler_view) RecyclerView recyclerView; 
    private UserAdapter mAdapter; 

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


     ArrayList<User> users = fetchUsers(); 

     mAdapter = new UserAdapter(this,users); 
     recyclerView.setLayoutManager(new LinearLayoutManager(this)); 
     recyclerView.setAdapter(mAdapter); 
} 

UserAdapter.java

public class UserAdapter extends RecyclerView.Adapter<UserAdapter.CustomViewHolder> { 
     @Inject CustomView.Provider myViewProvider; 

     private List<User> userList; 
     private Context mContext; 

     public UserAdapter(Context context, List<User> userList) { 
      this.userList = userList; 
      this.mContext = context; 
     } 

     @Override 
     public CustomViewHolder onCreateViewHolder(ViewGroup viewGroup, int position) { 
      View view = myViewProvider.get(parent); 

      CustomViewHolder viewHolder = new CustomViewHolder(view); 
      return viewHolder; 
     } 

     @Override 
     public void onBindViewHolder(CustomViewHolder customViewHolder, int position) { 
      ((CustomViewHolder) holder).init(userList.get(position));    

     } 

     @Override 
     public int getItemCount() { 
      return (null != userList ? userList.size() : 0); 
     } 

    public class CustomViewHolder extends RecyclerView.ViewHolder { 
     private final CustomView myView; 

     public CustomViewHolder(View itemView) { 
      super(itemView); 
      myView = (CustomView) itemView; 
     } 



public void init(final User user) { 
      myView.init(user); 
     } 

     } 
     } 

CustomView.java

@ProvidedBy(CustomView.Provider.class) 
public class CustomView extends RelativeLayout { 

    private View caret; 
    private TextView questionText; 

    public CustomView(Context context) { 
     super(context); 
    } 

    public CustomView(Context context, AttributeSet attrs) { 
     super(context, attrs); 
    } 

    public CustomView(Context context, AttributeSet attrs, int defStyleAttr) { 
     super(context, attrs, defStyleAttr); 
    } 

    @Override 
    protected void onFinishInflate() { 
     super.onFinishInflate(); 
     caret = findViewById(R.id.view_caret); 
     questionText = (TextView) findViewById(R.id.view_question); 

    } 

    public CustomView init(final User user) { 
     this.user = user; 
     //Set view 
     return this; 
    } 


    public static class Provider extends ViewProvider<CustomView> { 
     @Inject 
     public Provider(LayoutInflaterWithInjection<CustomView> inflater) { 
      super(R.layout.module_user, inflater); 
     } 
    } 
} 

私はこれを実行する際に、アプリがクラッシュします。 ログ - 私は私のCustomViewが正しく初期化されていないためだと思い

java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View com.user.CustomView$Provider.get(android.view.ViewGroup)' on a null object reference 
                     at com.user.UserAdapter.onCreateViewHolder(UserAdapter.java:356) 
                     at android.support.v7.widget.RecyclerView$Adapter.createViewHolder(RecyclerView.java:5228) 
                     at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4453) 
                     at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4363) 
                     at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:1961) 
                     at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1370) 
                     at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1333) 
                     at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:562) 
                     at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:2900) 
                     at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3071) 
                     at android.view.View.layout(View.java:16678) 

。誰かが助けることができますか？ありがとう!!

Answer 1

あなたが理解している限り、アダプタの中にカスタムビューを挿入しています（UserAdapter）。 アダプタにカスタムビューを挿入する場合は、アダプタをアクティビティに挿入する必要があります。

public class MainActivity extends AppCompatActivity { 

@Inject UserAdapter mAdapter; 
    @Override 
     protected void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 


      ArrayList<User> users = fetchUsers(); 
      mAdapter.setUp(this,users); 
      recyclerView.setLayoutManager(new LinearLayoutManager(this)); 
      recyclerView.setAdapter(mAdapter); 
    } 


} 

とアダプタが変更する必要があります - - あなたのMainActivity.javaで

あなたが変更を加える必要があり

public class UserAdapter extends RecyclerView.Adapter<UserAdapter.CustomViewHolder> { 
@Inject CustomView.Provider myViewProvider; 

     private List<User> userList; 
     private Context mContext; 

     @Inject 
     public UserAdapter() { 
     } 

     public void setup(Context context, List<User> userList) { 
      this.userList = userList; 
      this.mContext = context; 
     } 
... 
} 

希望はこのことができます！