I want to get the points and show to the owner of that account when he is logged in I tried reading firebase documentation but I couldn't made it here is the code that I use for assigning the random key and saving the child data

const autoid = firebase.database().ref("user").push().key;
firebase.database().ref("user").child(autoid).set({
  Email :email,
  Password : password,
  Points :"500"
});

I want whenever the user is login get his points from database and show it on their profile.

CodePudding user response：

In your code you are generating a random key and then assigning it to a variable. A better way to do is to get the userId and assign it as a documentid and then when retrieving the data use the userId to get the user's data.

For example, to add the data:

const database = firebase.database();
const user = firebase.auth().currentUser;
if (user !== null) {
  // Add user data in collection "users"
 database.ref("users").child(user.uid).set({
    email :email,
    password : password,
    points :"500"
   })
  .then(() => {
    console.log("data successfully written!");
   })
  .catch((error) => {
    console.error("Error writing data: ", error);
  });
}

Then after the user logins in, you can do the following to retrieve points:

const database = firebase.database();
const user = firebase.auth().currentUser;
if (user !== null) {
  let ref = database.ref("users").child(user.uid);
  ref.get().then((snapshot) => {
    if (snapshot.exists()) {
        console.log("data:", snapshot.val());
        console.log(snapshot.val().points);
    }
  }).catch((error) => {
    console.log("Error getting data:", error);
  });
}

CodePudding user response：

I can show you how to do it in java just adjust it to your kotlyn code: Define the reference you want to listen to(above the onCreate):

 FirebaseDatabase FBDB = FirebaseDatabase.getInstance();
 
 DatabaseReference refUsers=FBDB.getReference("Users");
 FirebaseUser user;


@Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_login);               
      user=FirebaseAuth.getInstance().getCurrentUser()

refUsers.child(user.getUid()).addListenerForSingleValueEvent(new 
 ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                customer = dataSnapshot.getValue(Customer.class);
                int points = customer.getPoints();
                ShowPoints();
       });
    }


}