如何从android上的firebase获取用户uid？

Question

I want to save data to firebase. This is my Activity Code :

private Firebase firebaseRef;
Firebase.setAndroidContext(this);

try {
    mUserId = firebaseRef.getAuth().getUid();
} catch (Exception e) {
    //  loginWithMailView();
}
itemsUrl = Constants.FIREBASE_URL + "/Person/" + mUserId +"/Information/";

//Person + null (?) + the other information

and this is for my button code :

buttonSave = (Button) findViewById(R.id.btnKaydolKayit);
buttonSave.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {
        firebaseRef = new Firebase(Constants.FIREBASE_URL);
        String name = editTextName.getText().toString().trim();
        String surname = editTextSurname.getText().toString().trim();
        String gender = final_result.getText().toString();
        String mail = editTextMail.getText().toString();
        String pass = editTextPass.getText().toString().trim();
        String phone = editTextPhone.getText().toString().trim();
        String trom = final_resultT.getText().toString();
        String bloodGroup = spinnerBlood.getSelectedItem().toString();
        String dateBlood = dateTextViewBlood.getText().toString();
        String dateTrombo = dateTextViewTrom.getText().toString();

        if (pass.isEmpty() || mail.isEmpty()) {
            AlertDialog.Builder builder = new AlertDialog.Builder(KaydolActivity.this);
            builder.setMessage(R.string.signup_error_message)
                    .setTitle(R.string.signup_error_title)
                    .setPositiveButton(android.R.string.ok, null);
            AlertDialog dialog = builder.create();
            dialog.show();
        } else {
            firebaseRef.createUser(mail, pass, new Firebase.ResultHandler(){

                @Override
                public void onSuccess() {
                    firebaseRef = new Firebase(Constants.FIREBASE_URL);
                    //  firebaseRef.setValue();
                    AlertDialog.Builder builder = new AlertDialog.Builder(KaydolActivity.this);
                    builder.setMessage("Hesap başarılı bir şekilde oluşturuldu!").setPositiveButton(R.string.login_button_label, new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialogInterface, int i) {
                            Intent intent = new Intent(KaydolActivity.this, loginWithMail.class);
                            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
                            startActivity(intent);
                        }
                    });
                    AlertDialog dialog = builder.create();
                    dialog.show();
                }

                @Override
                public void onError(FirebaseError firebaseError) {
                    AlertDialog.Builder builder = new AlertDialog.Builder(KaydolActivity.this);
                    builder.setMessage(firebaseError.getMessage())
                            .setTitle(R.string.signup_error_title)
                            .setPositiveButton(android.R.string.ok, null);
                    AlertDialog dialog = builder.create();
                    dialog.show();
                }
            });
        }

        new Firebase(itemsUrl).push().child("name").setValue(name);
        new Firebase(itemsUrl).push().child("surname").setValue(surname);
        new Firebase(itemsUrl).push().child("gender").setValue(gender);
        new Firebase(itemsUrl).push().child("mail").setValue(mail);
        new Firebase(itemsUrl).push().child("pass").setValue(pass);
        new Firebase(itemsUrl).push().child("phone").setValue(phone);
        new Firebase(itemsUrl).push().child("trom").setValue(trom);
        new Firebase(itemsUrl).push().child("bloodGroup").setValue(bloodGroup);
        new Firebase(itemsUrl).push().child("trom").setValue(trom);
        new Firebase(itemsUrl).push().child("dateBlood").setValue(dateBlood);
        new Firebase(itemsUrl).push().child("dateTrombo").setValue(dateTrombo);
    }
});

my source code (for help / for example ) : https://www.sitepoint.com/creating-a-cloud-backend-for-your-android-app-using-firebase/

When I save a data to firebase as the following photo ( Login&Auth )

but mUserId is null. so when I look database mUserid is null ( like a photo )

Answer 1

You can use these lines of code to get Current User Uid with Android Firebase Framework

FirebaseUser currentFirebaseUser = FirebaseAuth.getInstance().getCurrentUser() ;
Toast.makeText(this, "" + currentFirebaseUser.getUid(), Toast.LENGTH_SHORT).show();

Answer 2

要获取当前用户 UID，您只需要这行代码：

String currentuser = FirebaseAuth.getInstance().getCurrentUser().getUid();

Answer 3

the problem is that in firebase when you create a user it doesn't sign in the user. Here is from the docs:

Creates a new email / password user with the provided credentials. This method does not authenticate the user. After the account is created, the user may be authenticated with authWithPassword(). https://www.firebase.com/docs/web/api/firebase/createuser.html

Firebase ref = new Firebase("https://<YOUR-FIREBASE-APP>.firebaseio.com");
    ref.authWithPassword(mail, pass, new Firebase.AuthResultHandler() {
        @Override
        public void onAuthenticated(AuthData authData) {
            System.out.println("User ID: " + authData.getUid() + ", Provider: " + authData.getProvider());
        }
        @Override
        public void onAuthenticationError(FirebaseError firebaseError) {
            // there was an error
        }
    });

So once your user is created call the authWithPassword function. Hope it helps!

Answer 4

在您的代码中，您的 firebaseRef 似乎为 null，因此导致 null uid ，从 Firebase 获取用户 ID 的推荐方法是在用户登录后在您的应用程序中的任何位置执行以下操作

String uid = FirebaseAuth.getInstance().getCurrentUser().getUid();

Answer 5

in REACT NATIVE it's just like this.

  import firebase as 'firebase';

    HandleGetUserId=()=>{
    let userId = firebase.auth().currentUser.uid;
    return userId;
    }

just call the function HandleGetUserId to get the id like this

this.HandleGetUserId();

Answer 6

I was also having the same problem with getting the uid. When i had it printed on the log (Log.i), i could see the uid, however when trying to use it as one of the fields in one of my objects being created, the field does not get created.

I was doing thing : String currentUId = FirebaseAuth.getInstance().getCurrentUser().getUid();

This didn't work well for me.

SOLUTION I FOUND OUT - (worked for me - try it out)

Use : FirebaseUser currentU = FirebaseAuth.getInstance().getCurrentUser(); String uId = currentU.getUid();