How to Redirect Students, Teachers, and Admins to Their Respective Activities After Firebase Authentication?

Implementing Multi-User Redirection in a Firebase Voting App

In the context of a Firebase-based voting application, you are wondering how to redirect three distinct types of users (STUDENTS, TEACHERS, and ADMINS) to their respective activities after login. Here's a modified version of your code to cater to this requirement:

mAuthListener = new FirebaseAuth.AuthStateListener() {
  @Override
  public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
    FirebaseUser firebaseUser = FirebaseAuth.getInstance().getCurrentUser();

    if (firebaseUser != null) {
      String uid = firebaseUser.getUid();
      DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
      DatabaseReference usersRef = rootRef.child("users").child(uid);

      ValueEventListener userListener = new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
          // Assert that the DataSnapshot is valid
          if (!dataSnapshot.exists()) {
            Log.e(TAG, "Error: DataSnapshot not found");
            return;
          }

          // Check the user type and redirect accordingly
          if (dataSnapshot.child("type").getValue(Long.class) == 1) {
            startActivity(new Intent(MainActivity.this, student.class));
          } else if (dataSnapshot.child("type").getValue(Long.class) == 2) {
            startActivity(new Intent(MainActivity.this, teacher.class));
          } else if (dataSnapshot.child("type").getValue(Long.class) == 3) {
            startActivity(new Intent(MainActivity.this, admin.class));
          }
        }

        @Override
        public void onCancelled(@NonNull DatabaseError databaseError) {
          Log.e(TAG, databaseError.getMessage());
        }
      };

      usersRef.addListenerForSingleValueEvent(userListener);
    }
  }
};

Key Changes:

• The uidRef has been updated to point to the users node under the Firebase root.
• Instead of checking only for the existence of a student, the code now checks the type child node to determine the user's type.
• Three separate conditionals have been added to handle all three user types.

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