How to fetch data from firebase in the form of ArrayList in Android

Question

In this format i have databse in firebase.I have to display all the departments in the form of array list like Director,sports.

firebase

mAuth=FirebaseAuth.getInstance();
 mdatabase=FirebaseDatabase.getInstance().getReference().child("Department";
mdatabase.addValueEventListener(new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        List<String> Department = (ArrayList<String>) dataSnapshot.getValue();
         DepartmentLIST=Department.toArray(new String[Department.size()]);

    }
   @Override
   public void onCancelled(DatabaseError databaseError) {
       Toast.makeText(CheckUpdate.this,databaseError.getMessage(),Toast.LENGTH_LONG).show();
   }

  });

setListAdapter(new ArrayAdapter(this,
        android.R.layout.simple_list_item_1,DepartmentLIST));

}

This is my code i have used for it. But it gives NullValue.

OneCricketeer · Accepted Answer · 2017-06-08 20:47:50Z

1

(ArrayList<String>) dataSnapshot.getValue() isn't correct.

I think you are looking for dataSnapshot.getChildren(), and / or dataSnapshot.getValue(String.class).

Note: Firebase-UI library could help you here.

answered Jun 8, 2017 at 20:47

OneCricketeer

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