lateinit 属性绑定尚未初始化，但我没有将其设置为 lateinit

Question

我在尝试使用新的 ViewBinding 更新我的视图时遇到了这个错误。我没有将值定义为“lateinit”，但 logccat 说“lateinit 属性绑定尚未初始化”，为什么我要使用它？

提前致谢。

私人 val 电子邮件和密码行除外。

class MainActivity : AppCompatActivity() {

private lateinit var auth : FirebaseAuth
private lateinit var binding: ActivityMainBinding
private val email    = binding.emailText.text.toString()  
private val password = binding.passwordText.text.toString()


override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    binding = ActivityMainBinding.inflate(layoutInflater)
    val view = binding.root
    setContentView(view)

    auth= FirebaseAuth.getInstance()

    val guncelKullanici = auth.currentUser

   if (guncelKullanici!= null) {
       val intent = Intent(this, haber_akisi::class.java)
       startActivity(intent)
       finish()




   }
}

fun girisYap ( view: View) {

    if (email.isNotBlank()  && password.isNotBlank()) {
        auth.signInWithEmailAndPassword(email,password)
        .addOnCompleteListener { task ->
            if (task.isSuccessful) {
                val intent = Intent(this,haber_akisi::class.java)
                startActivity(intent)
                finish()

            }
        }.addOnFailureListener { exception ->
            Toast.makeText(this,exception.localizedMessage,Toast.LENGTH_LONG).show()
        }}else {
        Toast.makeText(this,"Lütfen E-mail ve Password alanlarını doldurunuz",Toast.LENGTH_LONG).show()
    }
}

fun kayitOl ( view : View) {

    if ( email.isNotBlank() && password.isNotBlank() ) {
            auth.createUserWithEmailAndPassword(email, password)
                .addOnCompleteListener(this) { task ->
                    if (task.isSuccessful) {
                        val intent = Intent(this, haber_akisi::class.java)
                        startActivity(intent)
                        finish()
                        }
                    }.addOnFailureListener { exception ->
                    Toast.makeText(this, exception.localizedMessage, Toast.LENGTH_LONG).show()
                }

            }else {
            Toast.makeText(this,"Lütfen E-mail ve Password alanlarını doldurunuz",Toast.LENGTH_LONG).show()
        }
    }
}

Answer 1

这是因为 private val email = binding.emailText.text.toString() 在初始化之前使用了“绑定”变量。错误是说“lateinit var binding”尚未初始化，但您正在 private val email = binding.emailText.text.toString()

上访问它

编辑：解决这个问题的一种方法是将电子邮件和密码也设置为 lateinit 变量。另一种方法是没有电子邮件和密码 class 级别的属性，只在需要的地方访问绑定，就像在 girisYap() 和 kayitOl()

中一样

Answer 2

您将在其声明后的下一行中访问绑定（ActivityMainBinding 标识符）。

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