CODEWITHSUNDEEP
androidfirebasegoogle-cloud-firestorefirebase-authentication
Vimal Thanikachalam
Vimal Thanikachalam

Reputation: 275

Firestore Collection on a null object reference

I'm trying to add two new fields Mobile and Message for an existing userid, the user id is not null id is printing on the Log, but when I try to push the value, the app crashes and gives me the following error.

Attempt to invoke virtual method 'com.google.firebase.firestore.CollectionReference com.google.firebase.firestore.FirebaseFirestore.collection(java.lang.String)' on a null object reference*

What am I doing wrong?

userphone = (EditText) findViewById(R.id.user_phone);
usermessage = (EditText) findViewById(R.id.user_message);

button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                final String phone = userphone.getText().toString().trim();
                final String message = usermessage.getText().toString().trim();


                    String userID = firebaseAuth.getCurrentUser().getUid();

                    DocumentReference documentReference = fStore.collection("users").document(userID);

                    Map<String,Object> user = new HashMap<>();

                    user.put("user_phone",userphone.getText().toString().trim());
                    user.put("user_message", usermessage.getText().toString().trim());

                    documentReference.set(user).addOnSuccessListener(new OnSuccessListener<Void>() {
                        @Override
                        public void onSuccess(Void aVoid) {
                            Toast.makeText(MainActivity.this, "Successfull", Toast.LENGTH_SHORT).show();
                        }
                    }).addOnFailureListener(new OnFailureListener() {
                        @Override
                        public void onFailure(@NonNull Exception e) {
                            Toast.makeText(MainActivity.this, "Boooo!", Toast.LENGTH_SHORT).show();
                        }
                    });

Upvotes: 0

Views: 479

Answers (2)

Saketh ram
Saketh ram

Reputation: 11

You are not updating the values ; instead you're replacing the prevoius map with a new one. Use fstore.collection().document().update(key,value,key,value); to update specific fields without modifying other values.

Upvotes: 1

Doug Stevenson
Doug Stevenson

Reputation: 317710

fStore is null. You probably never gave it a value, but we can't see where you defined it. You're going to have to assign it FirebaseFirestore.getInstance() somewhere.

Upvotes: 3

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