Hinzufügen einer Schaltfläche zum Löschen in einer RecyclerView

Question

Ich versuche, eine Schaltfläche zum Löschen hinzufügen, die ein Element in einer Datenbank basierend auf der Position in der RecyclerView löschen soll. Ich kämpfe damit. Hier ist mein Layout-Datei für die RecyclerView:

<TextView 
    android:id="@+id/layout_list_name" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignParentStart="true" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentTop="true" 
    android:textStyle="bold" 
    android:textAppearance="?android:attr/textAppearanceLarge" /> 

<TextView 
    android:id="@+id/layout_list_date" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignStart="@+id/layout_list_name" 
    android:layout_alignLeft="@+id/layout_list_name" 
    android:layout_below="@+id/layout_list_name" /> 

<ImageButton 
    android:id="@+id/layout_list_delete" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignParentTop="true" 
    android:layout_alignParentRight="true" 
    android:layout_alignParentEnd="true" 
    android:contentDescription="Delete" 
    android:src="@drawable/icon_layout_delete_layout_item" /> 

Dies ist, wo ich die onItemClick für die ImageButton erklären, die die Löschtaste ist:

imageButton.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      Toast.makeText(getBaseContext(), "Delete hit!", Toast.LENGTH_SHORT).show(); 
     } 
    }); 

Das ist mein RecyclerView Listener-Klasse:

private OnItemClickListener onItemClickListener; 

public interface OnItemClickListener { 
    void onItemClick(View view, int position); 
} 

GestureDetector gestureDetector; 

public ListsDatabaseItemListener(Context context, OnItemClickListener listener) { 
    onItemClickListener = listener; 
    gestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() { 
     @Override 
     public boolean onSingleTapUp(MotionEvent motionEvent) { 
      return true; 
     } 
    }); 
} 

@Override 
public boolean onInterceptTouchEvent(RecyclerView recyclerView, MotionEvent motionEvent) { 
    View view = recyclerView.findChildViewUnder(motionEvent.getX(), motionEvent.getY()); 

    if (view != null && onItemClickListener != null && gestureDetector.onTouchEvent(motionEvent)) { 
     onItemClickListener.onItemClick(view, recyclerView.getChildLayoutPosition(view)); 

     return true; 
    } 
    return false; 
} 

@Override 
public void onTouchEvent(RecyclerView recyclerView, MotionEvent motionEvent) { 

} 

@Override 
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) { 

} 

Und schließlich, hier ist meine Adapterklasse:

List<ListsDatabaseList> list; 

public ListsDatabaseListAdapter(List<ListsDatabaseList> list) { 
    this.list = list; 
} 

@Override 
public ListsDatabaseListHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
    View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_list, parent, false); 
    ListsDatabaseListHolder holder = new ListsDatabaseListHolder(view); 

    return holder; 
} 

@Override 
public void onBindViewHolder(ListsDatabaseListHolder holder, int position) { 
    holder.name.setText(list.get(position).getName()); 
    holder.date.setText(list.get(position).getDate()); 
} 

@Override 
public int getItemCount() { 
    return list.size(); 
} 

public static class ListsDatabaseListHolder extends RecyclerView.ViewHolder { 
    TextView name; 
    TextView date; 
    ImageButton delete; 

    public ListsDatabaseListHolder(View view) { 
     super(view); 

     this.name = (TextView) view.findViewById(R.id.layout_list_name); 
     this.date = (TextView) view.findViewById(R.id.layout_list_date); 
     this.delete = (ImageButton) view.findViewById(R.id.layout_list_delete); 
    } 
} 

Haben Sie Vorschläge, wie Sie dies erreichen können?

Answer 1

können Sie fügen die ImageButton Klick Zuhörer in Ihrer onBindViewHolder() Methode:

@Override 
public void onBindViewHolder(ListsDatabaseListHolder holder, final int position) { 

    holder.name.setText(list.get(position).getName()); 
    holder.date.setText(list.get(position).getDate()); 

    holder.delete.setOnClickListener(new View.OnClickListener() { 
      public void onClick(View v) { 
       ListsDatabaseList theRemovedItem = list.get(position); 
       // remove your item from data base 
       list.remove(position); // remove the item from list 
       notifyItemRemoved(position); // notify the adapter about the removed item 
      } 
    }); 
}