java - 更新数据 Firebase

Question

我是 Firebase 新手，我设法将数据保存在数据库中，但现在我也想更新我的数据。我读了很多东西，看了很多视频，但我无法以正确的方式更新它。

protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
    setContentView(R.layout.profilbearbeiten);
        fAuth = FirebaseAuth.getInstance();
        fStore = FirebaseFirestore.getInstance();
        FirebaseDatabase database = FirebaseDatabase.getInstance();
        userId = fAuth.getCurrentUser().getUid();
        fullName = findViewById(R.id.tv_name);
        email    = findViewById(R.id.tvEmail);
        bestätigen = findViewById(R.id.btbestätigen);
        ort = findViewById(R.id.tv_address);
        telefonummer = findViewById(R.id.tvTel);
        interessen = findViewById(R.id.tvInt);
        beschreibung = findViewById(R.id.tvBesc);

        bestätigen.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(ProfilBearbeiten.this, Profile.class);
                startActivity(intent);
            }
        });
        DocumentReference documentReference = fStore.collection("users").document(userId);
        documentReference.addSnapshotListener(this, new EventListener<DocumentSnapshot>() {
            @Override
            public void onEvent(@Nullable DocumentSnapshot documentSnapshot, @Nullable FirebaseFirestoreException e) {
                fullName.setText(documentSnapshot.getString("Benutername"));
                email.setText(documentSnapshot.getString("EMail"));
                ort.setText(documentSnapshot.getString("Ort"));
                telefonummer.setText(documentSnapshot.getString("Telefonnummer"));
                interessen.setText(documentSnapshot.getString("Interessen"));
                beschreibung.setText(documentSnapshot.getString("Beschreibung"));

            }
        });

所以我在这里调用数据库中的数据，现在我想编辑数据库:

图片应用程序和数据库

Answer 1

你可以使用setValue方法，就像这个

FirebaseDatabase  database = FirebaseDatabase.getInstance();
DatabaseReference mDatabaseRef = database.getReference();

mDatabaseRef.child("TABLE_NAME").child("TABLE_FIELD").setValue(2);