protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_register);
        ref = FirebaseDatabase.getInstance().getReference().child("User");
}
public void Register(View view){
        fname = findViewById(R.id.editText2);
        lname = findViewById(R.id.editText3);
        password = findViewById(R.id.editText5);
        email = findViewById(R.id.editText4);
        fauth = FirebaseAuth.getInstance();
        text = findViewById(R.id.textView2);

        if(!TextUtils.isEmpty(email.getText().toString()) && !TextUtils.isEmpty(password.getText().toString())){
            fauth.createUserWithEmailAndPassword(email.getText().toString(),password.getText().toString()).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
                @Override
                public void onComplete(@NonNull Task<AuthResult> task) {
                    if(task.isSuccessful()){
                        Toast.makeText(RegisterActivity.this,"User created",Toast.LENGTH_LONG).show();
                        Intent intent = new Intent(RegisterActivity.this,MainActivity.class);
                        user = new User();
                        user.FirstName = fname.getText().toString();
                        user.LastName = lname.getText().toString();
                        user.Email = email.getText().toString();
                        user.Password = password.getText().toString();
                        ref.push().setValue(user);
                        startActivity(intent);
                    }else {
                        Toast.makeText(RegisterActivity.this,"Failed to create user",Toast.LENGTH_LONG).show();
                    }
                }
            });
        }

    }