Firebase Android CRUD

İnsert Data:

String id=mdatabase.push().getKey();
data=new Model(id,date,name,surname,radiocheck(r1,r2));
mdatabase.child(id).setValue(data);

Delete Data:

 mdatabase.child(key).removeValue();

Update Data:

Model model = new Model(key,date,getname,getsurname,getgender);
mdatabase.child(key).setValue(model);

List Data:

private void fetch() {

        Query query = FirebaseDatabase.getInstance()
                .getReference()
                .child("NameList");

        FirebaseRecyclerOptions<Model> options =
                new FirebaseRecyclerOptions.Builder<Model>()
                        .setQuery(query, new SnapshotParser<Model>() {
                            @NonNull
                            @Override
                            public Model parseSnapshot(@NonNull DataSnapshot snapshot) {
                                return new Model(snapshot.child("name").getValue().toString(),
                                        snapshot.child("surname").getValue().toString(),
                                        snapshot.child("gender").getValue().toString());
                            }
                        })
                        .build();

        adapter = new FirebaseRecyclerAdapter<Model, ViewHolder>(options) {
            @Override
            public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
                View view = LayoutInflater.from(parent.getContext())
                        .inflate(R.layout.custom_list_item, parent, false);

                return new ViewHolder(view);
            }


            @Override
            protected void onBindViewHolder(ViewHolder holder, final int position, final Model model) {



                holder.setName("Name:"+model.getName());
                holder.setSurname("Surname:"+model.getSurname());
                holder.setGender("Gender:"+model.getGender());
                holder.myview.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        key=getRef(position).getKey();
                        getname=model.getName();
                        getsurname=model.getSurname();
                        getgender=model.getGender();

                        mydialog();
                    }
                });

                            }

        };
        recyclerView.setAdapter(adapter);
}