There is an application in it posts. Likes, done as follows:

postReference = firebaseDatabase.getInstance().getReference().child("Posts"); holder.likeBtn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { final DatabaseReference likeReference = postReference.child(listUserId).child("Likes"); likeReference.addValueEventListener(new ValueEventListener() { @Override public void onDataChange(@NonNull DataSnapshot dataSnapshot) { if (!dataSnapshot.hasChild(currentUserId)){ likeReference.child(currentUserId).removeValue(); }else { likeReference.child(currentUserId).setValue("Like"); } } @Override public void onCancelled(@NonNull DatabaseError databaseError) { } });

The problem is that after pressing the button, the record in the database starts to be added and deleted without stopping. How to fix it? My DB: database

Solution: instead of addValueEventListener, addListenerForSingleValueEvent should be used.

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