android - 从 RecyclerAdapter 上的 firebase 中删除数据

Question

我要在我的 RecyclerViewAdapter 上删除一个带有 PopupMenu 的列表项，但是当该项目被删除时，它会保留在 Firebase 上。

This is on the onBindViewHolder on the RecyclerAdapter

holder.opcionesButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            //creating a popup menu
            PopupMenu popup = new PopupMenu(context, holder.opcionesButton);
            //inflating menu from xml resource
            popup.inflate(R.menu.menu_edit);
            //adding click listener
            popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
                @Override
                public boolean onMenuItemClick(MenuItem item) {
                    switch (item.getItemId()) {
                        case R.id.edit_item:
                            //handle menu1 click
                            break;
                        case R.id.delete_item:

                            tareasList.remove(position);
                            notifyItemRemoved(position);
                            Toast.makeText(context, "Tareas eliminada!", Toast.LENGTH_SHORT).show();
                            break;

                    }
                    return false;
                }
            });
            //displaying the popup
            popup.show();
        }
    });

And this is on the MainFragment

  final Query tareasQuery = mTareasDatabase.child(userId);
        tareasQuery.addChildEventListener(new ChildEventListener() {

            @Override
            public void onChildAdded(DataSnapshot dataSnapshot, String s) {
                Tareas tareas = new Tareas();
                tareas.setFecha(dataSnapshot.getValue(Tareas.class).getFecha());
                tareas.setDescripcion(dataSnapshot.getValue(Tareas.class).getDescripcion());
                tareas.setLista(dataSnapshot.getValue(Tareas.class).getLista());
                tareas.setPrioridad(dataSnapshot.getValue(Tareas.class).getPrioridad());
                mTareasList.add(tareas);
                mTareasAdapter.notifyDataSetChanged();

            }

            @Override
            public void onChildChanged(DataSnapshot dataSnapshot, String s) {
                String tareasId = dataSnapshot.getValue(Tareas.class).getTareasId();
                mTareasDatabase.child(userId).child(tareasId).removeValue();
            }

            @Override
            public void onChildRemoved(DataSnapshot dataSnapshot) {
                String tareasId = dataSnapshot.getValue(Tareas.class).getTareasId();
                mTareasDatabase.child(userId).child(tareasId).removeValue();

            }

            @Override
            public void onChildMoved(DataSnapshot dataSnapshot, String s) {

            }

            @Override
            public void onCancelled(DatabaseError databaseError) {

            }
        });

一切正常，只是没有从 firebase 中删除它

解决方案

同时从 firebase 和 recycler View 中删除项目

case R.id.delete_item:
                            FirebaseDatabase firebaseDatabase = FirebaseDatabase.getInstance();
                            String tareasId = tareas.getTareasId();
                            final FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
                            String userId = user.getUid();
                            DatabaseReference databaseReference = firebaseDatabase.getReference("Tareas")
                                    .child(userId).child(tareasId);
                            databaseReference.removeValue();

                            tareasList.remove(position);
                            notifyItemRemoved(position);
                            Toast.makeText(context, "Tareas eliminada!", Toast.LENGTH_SHORT).show();
                            break;

Answer 1

好的，我解决了。我只需要在删除项上添加所有数据库引用，并同时从回收器 View 和数据库中删除它

 case R.id.delete_item:
                            FirebaseDatabase firebaseDatabase = FirebaseDatabase.getInstance();
                            String tareasId = tareas.getTareasId();
                            final FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
                            String userId = user.getUid();
                            DatabaseReference databaseReference = firebaseDatabase.getReference("Tareas")
                                    .child(userId).child(tareasId);
                            databaseReference.removeValue();

                            tareasList.remove(position);
                            notifyItemRemoved(position);
                            Toast.makeText(context, "Tareas eliminada!", Toast.LENGTH_SHORT).show();
                            break;