Boutons de liaison avec les gestionnaires d'incrémentation et de décrémentation dans la connexion android

Question

J'essaie d'implémenter une augmentation et une diminution de la quantité dans un TextView avec des Handlers, mais toujours la même erreur m'aide à comprendre où je manque pour obtenir le résultat attendu . Erreur: Échec de l'exécution de la tâche ': app: compileDebugJavaWithJavac'.

java.lang.RuntimeException: Found data binding errors. ****/ data binding error ****msg:Identifiers must have user defined types from the XML file. view is missing it file:C:\Users\Tushar Rai\Desktop\Demo\Demo\app\src\main\res\layout\fragment_list.xml ****\ data binding error ****

<layout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
xmlns:app="http://schemas.android.com/apk/res-auto"> 

<data> 

    <variable 
     name="quantity" 
     type="int"/> 

    <variable 
     name="Handlers" 
     type="com.demo.www.demo.ui.Fragment.Handlers"/> 

    <import type="android.view.View"/> 
</data> 

    <LinearLayout 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:orientation="horizontal" 
     android:layout_alignParentEnd="true" 
     android:paddingTop="16dp" 
     android:paddingBottom="16dp"> 


     <Button 
      style="?android:attr/buttonStyleSmall" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="@string/decrease" 
      android:onClick="@{Handlers.decrement(view, 0)}" /> 

     <TextView 
      android:layout_width="32dp" 
      android:layout_height="wrap_content" 
      app:quantity="@{quantity}" 
      android:textAlignment="center" /> 

     <Button 
      style="?android:attr/buttonStyleSmall" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="@string/increase" 
      android:onClick="@{Handlers.increment(view, 10)}" /> 

    </LinearLayout> 

public class Fragment étend Fragment {

FirebaseRecyclerAdapter adapter; 
Firebase mFirebaseRef = new Firebase("https://demo.firebaseio.com/").child("list"); 

public Fragment() { 
    // Required empty public constructor 
} 

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

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    // Inflate the layout for this fragment 
    final View rootView = inflater.inflate(R.layout.recycler_view, container, false); 
    final RecyclerView recyclerView = (RecyclerView) rootView.findViewById(R.id.recycler_view); 

    adapter = new FirebaseRecyclerAdapter<List, ViewHolder>(List.class, R.layout.fragment_list, 
      ViewHolder.class, mFirebaseRef) { 
     @Override 
     protected void populateViewHolder(ViewHolder viewHolder, List list, int i) { 

      FragmentBinding binding = viewHolder.getBinding(); 
      binding.setList(list); 
      Handlers handlers = new Handlers(); 
      binding.setHandlers(handlers); 


     } 
    }; 
    recyclerView.setAdapter(adapter); 
    recyclerView.setHasFixedSize(true); 
    recyclerView.setLayoutManager(new LinearLayoutManager(getActivity())); 
    recyclerView.addItemDecoration(new DividerItemDecoration(getActivity(), null)); 
    return rootView; 
} 

public static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener { 

    public FragmentBinding binding; 

    public ViewHolder(View itemView) { 
     super(itemView); 
     binding = DataBindingUtil.bind(itemView); 
     itemView.setOnClickListener(this); 
    } 

    public FragmentBinding getBinding() { 
     return binding; 
    } 
    @Override 
    public void onClick(View v) { 


    } 
} 
@BindingAdapter("imageUrl") 
public static void setImage(ImageView imageView, String imageUrl) { 
    Picasso.with(imageView.getContext()).load(imageUrl).into(imageView); 
} 
@BindingAdapter("quantity") 
public static void setQuantityText(TextView view, int quantity) { 
    view.setText(String.valueOf(quantity)); 
} 
public class Handlers { 

    public void decrement(View view, int min) { 
     FragmentBinding binding = DataBindingUtil.findBinding(view); 
     binding.setQuantity(Math.min(min, binding.getQuantity() - 1)); 
    } 
    public void increment(View view, int max) { 
     FragmentBinding binding = DataBindingUtil.findBinding(view); 
     binding.setQuantity(Math.max(max, binding.getQuantity() + 1)); 
    } 

} 

}

Answer 1

Je pense que problème est dans votre incrément & méthodes de décrémentation. Vous ne pouvez pas surcharger ce paramètre de méthodes.

Vous devez écrire comme:

public class Handlers { 

public void decrement(View view) { 
    FragmentBinding binding = DataBindingUtil.findBinding(view); 
    binding.setQuantity(Math.min(min, binding.getQuantity() - 1)); 
} 
public void increment(View view) { 
    FragmentBinding binding = DataBindingUtil.findBinding(view); 
    binding.setQuantity(Math.max(max, binding.getQuantity() + 1)); 
} 

}

Et en xml:

android:onClick="@{Handlers.increment}" 

voir le lien pour plus: DataBinding