如何在我的 Firebase 数据库中增加价值？ [复制]

Question

请帮帮我 我正在制作一个投票应用程序

我已经到了一个阶段，我想选择一个会增加数据库投票数的人，但我不知道该怎么做

我想要一个方法。当用户点击应用程序中的名称时，count 在数据库中从 1 增加到 2，并在每次点击时继续增加

我想从数据库中读取计数，然后在单击应用程序中的按钮或文本名称时增加它

如何在我的代码中使用 Transaction 来做到这一点取决于我的数据库？

RecyclerView raees_RecyclerView;
private DatabaseReference databaseReference;
private ArrayList <Condidate> candidateArrayList;
private Context context;
FirebaseRecyclerAdapter<Condidate, RaeesRecyclerViewAdapter> adapter;
Button vote;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.raees__at7ad);

    raees_RecyclerView = findViewById(R.id.raees_recyclerView);
    LinearLayoutManager layoutManager =new LinearLayoutManager(this);
    raees_RecyclerView.setLayoutManager(layoutManager);
    raees_RecyclerView.setHasFixedSize(true);
    vote = findViewById(R.id.voteBtn);
    databaseReference = FirebaseDatabase.getInstance().getReference("المرشحون").child("رئيس اتحاد الطلبة");

    candidateArrayList = new ArrayList <>();

    loadDataFromfirebaseToRecyclerView();

}

private void loadDataFromfirebaseToRecyclerView() {
    FirebaseRecyclerOptions <Condidate> options = new FirebaseRecyclerOptions.Builder<Condidate>()
            .setQuery(databaseReference,Condidate.class)
            .build();
    FirebaseRecyclerAdapter<Condidate, RaeesRecyclerViewAdapter> firebaseRecyclerAdapter =
            new FirebaseRecyclerAdapter <Condidate, RaeesRecyclerViewAdapter>(options) {
                @Override
                protected void onBindViewHolder(@NonNull final RaeesRecyclerViewAdapter viewHolder, int postion, @NonNull Condidate condidate) {

                    viewHolder.textView.setText(condidate.getName());

                    final Condidate clickItem= condidate;

                    viewHolder.setItemClickListener(new RecyclerViewInterface() {
                        @Override
                        public void onClick(View view, int position, boolean isLongClick) {

                            // the method for make count increment in database here can help pls

                        }
                    }); }

                @NonNull
                @Override
                public RaeesRecyclerViewAdapter onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
                    View view = LayoutInflater.from(parent.getContext())
                            .inflate(R.layout.raees_card,parent,false);

                    return new RaeesRecyclerViewAdapter(view);
                }
            };

    firebaseRecyclerAdapter.startListening();
    raees_RecyclerView.setAdapter(firebaseRecyclerAdapter);
}

////////

public TextView textView;

private RecyclerViewInterface recyclerViewInterface;

public RaeesRecyclerViewAdapter(@NonNull View itemView) {
    super(itemView);

    textView=itemView.findViewById(R.id.raeesName);
    itemView.setOnClickListener(this);
}

public void setItemClickListener(RecyclerViewInterface itemClickListener) {
    this.recyclerViewInterface = itemClickListener;
}

@Override
public void onClick(View view) {
    recyclerViewInterface.onClick(view,getAdapterPosition(),false);

}

Answer 1

  for(DataSnapshot dataSnapshot : snapshot.getChildren()) {

                                        if(dataSnapshot.child("name").getValue().toString() == viewHolder.textView.getText()) {
                                            id = dataSnapshot.getKey();
                                            Integer count = snapshot.child(id).child("count").getValue(Integer.class);

                                            databaseReference.child(id).child("count").setValue(count + 1);
                                            break;
                                        }
                                    }
                                    Toast.makeText(naeeb_Ameen_nshat_fnee.this, "done", Toast.LENGTH_SHORT).show();