CODEWITHSUNDEEP
androidfirebasenull-pointer
Kawal Singh
Kawal Singh

Reputation: 65

Firebase null pointer exception

I am getting null pointer exception in firebase I knows that there is not any value like that to which database reference I am giving but I wants that when the value is generated then it will be shown automatically... Just wants to get that single value everytime it is created on the firebase but its giving me null pointer exception on the line String val =.....

Please help me ...

final DatabaseReference dtt = database.getReference("/trial/trials/");
    dtt.addValueEventListener(new ValueEventListener() {

        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            String val= dataSnapshot.child("myvalue").getValue().toString();
            if(val!=null)
            {
                Log.e("not null------","---------------");
            }else
            {
                Log.e("null------","---------------");
            }
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });

Please help me.....Please ..

Upvotes: 3

Views: 3092

Answers (2)

Mohamed Yehia
Mohamed Yehia

Reputation: 401

final DatabaseReference dtt = database.getReference("/trial/trials/");
dtt.addValueEventListener(new ValueEventListener() {

    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        String val= dataSnapshot.child("myvalue").getValue(String.class);
        if(val!=null)
        {
            Log.e("not null------","---------------");
        }else
        {
            Log.e("null------","---------------");
        }
    }

    @Override
    public void onCancelled(DatabaseError databaseError) {

    }
});

Upvotes: 7

Dmytro Rostopira
Dmytro Rostopira

Reputation: 11185

You are using getValue() in wrong way. Should be

String val= dataSnapshot.child("myvalue").getValue(String.class);

To check, if value exists you can convert dataSnapshot to Hashmap, like this

HashMap<String, Object> hashmap = (HashMap) dataSnapshot.getValue();
String val= hashmap.get("myvalue");

Upvotes: 2

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