Why did my button activity cannot run me to the other page? - kotlin

Question

This is my button.
I not sure if that my button have the problem or the kotlin files have the problem. The Home fragment is using binding to bind with the home fragment. Maybe is the intent in the fragment have the problem?
<Button
android:id="#+id/registerbutton"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:padding="14dp"
android:text="#string/register"
android:textAllCaps="false"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/editText3"
app:layout_constraintWidth_percent=".8"
android:background="#drawable/btn_bg_design"
app:layout_constraintVertical_bias="0.6"
/>
This is my registration activity
class RegistrationActivity : AppCompatActivity() {
private lateinit var binding:ActivityRegistrationBinding
private lateinit var db: FirebaseFirestore
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityRegistrationBinding.inflate(layoutInflater)
setContentView(R.layout.activity_registration)
db = FirebaseFirestore.getInstance() // singleton
binding.registerbutton.setOnClickListener{
val fullName = binding.editText1.text.toString()
val email = binding.editText2.text.toString()
val password = binding.editText3.text.toString()
val register = Register(fullName,email, password)
// pass the User data obj to the firestore
db.collection("Register").document("$email").set(register)
intent = Intent(this, MainActivity:: class.java)
Intent(this, HomeFragment:: class.java).putExtra("email",email)
startActivity(intent)
}
}
fun login(view: View) {
intent = Intent(this, LoginActivity:: class.java)
startActivity(intent)
}
}
This is my homefragment
class HomeFragment : Fragment() {
//private lateinit var homeViewModel: HomeViewModel (delete)
private var _binding: FragmentHomeBinding? = null
private lateinit var db: FirebaseFirestore
// This property is only valid between onCreateView and
// onDestroyView.
private val binding get() = _binding!!
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
_binding = FragmentHomeBinding.inflate(inflater, container, false)
val root: View = binding.root
db = FirebaseFirestore.getInstance()
val intent = Intent(activity,RegistrationActivity::class.java)
val email = intent.getStringExtra("email")
db.collection("Register").document("$email").get()
.addOnSuccessListener { doc->
binding.textViewName.text = doc.get("fullName").toString()
}
.addOnFailureListener {
Log.e("Firestore", "Error in loading file: ${it.toString()}")
}
return root
}
override fun onDestroyView() {
super.onDestroyView()
_binding = null
}
}

Answer 1

Try to change the code in RegistrationActivity like this:
binding.registerbutton.setOnClickListener{
val fullName = binding.editText1.text.toString()
val email = binding.editText2.text.toString()
val password = binding.editText3.text.toString()
val register = Register(fullName,email, password)
// pass the User data obj to the firestore
db.collection("Register").document("$email").set(register)
val intent = Intent(this, MainActivity:: class.java)
intent.putExtra("email", email)
startActivity(intent)
}
Also, you should pass the data to the fragment using a Bundle:
val bundle = Bundle()
bundle.putString("email", email)
homeFragment.arguments = bundle
And retrieve it in the fragment using the arguments object:
val email = arguments?.getString("email") ?: ""