CODEWITHSUNDEEP
javaandroidfirebasefirebase-realtime-database
Reymand
Reymand

Reputation: 61

Separate Activity for different users

I have my android project where there are two different user types: an admin and a normal user. I actually found a solution here not specifically a solution since it does not work for me.

Home Fragment.java

public View onCreateView(@NonNull final LayoutInflater inflater, @Nullable final ViewGroup container, @Nullable Bundle savedInstanceState) {

    FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
    final String uid = user.getUid();
    Query userQuery = FirebaseDatabase.getInstance().getReference().child("User").child(uid).child("isAdmin");

    userQuery.addValueEventListener(new ValueEventListener() {

        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
            String type = dataSnapshot.child("isAdmin").getValue().toString();

            if(type.equals("true")){

                loadMenuBeachAdmin();

                FloatingActionButton fab = (FloatingActionButton) homeView.findViewById(R.id.fab);
                fab.show();
      }
}

Database

enter image description here

The error I'm getting:

java.lang.NullPointerException: Attempt to invoke virtual method
        'java.lang.String java.lang.Object.toString()' on a null object reference at 
com.example.batangasbeachhousesfinal.HomeFragment$1.onDataChange(HomeFragment.java:92)

which is the String type = dataSnapshot.child("isAdmin").getValue().toString();

Upvotes: 0

Views: 67

Answers (1)

Peter Haddad
Peter Haddad

Reputation: 80914

Change this:

 Query userQuery = FirebaseDatabase.getInstance().getReference().child("User").child(uid).child("isAdmin");
userQuery.addValueEventListener(new ValueEventListener() {
    @Override
    public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
        String type = dataSnapshot.child("isAdmin").getValue().toString();
        if(type.equals("true")){
            loadMenuBeachAdmin();


            FloatingActionButton fab = (FloatingActionButton) homeView.findViewById(R.id.fab);
            fab.show();

   }
}

into this:

Query userQuery = FirebaseDatabase.getInstance().getReference().child("User").child(uid);
userQuery.addValueEventListener(new ValueEventListener() {
    @Override
    public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
        String type = dataSnapshot.child("isAdmin").getValue().toString();
        if(type.equals("true")){
            loadMenuBeachAdmin();


            FloatingActionButton fab = (FloatingActionButton) homeView.findViewById(R.id.fab);
            fab.show();

  }
}

Your dataSnapshot is already at child isAdmin, so you need to go one step up and then you will be able to retrieve the isAdmin child.

Upvotes: 1

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