initAuthStateListener.kt

 private fun initAuthStateListener(){
        mAuthStateListener=object : FirebaseAuth.AuthStateListener{
            override fun onAuthStateChanged(p0: FirebaseAuth) {
                var kullanici=p0.currentUser
                if (kullanici != null){
                    if(kullanici.isEmailVerified){
                        Toast.makeText(this@LoginActivity,"Mail onaylandı giriş yapabilirsiniz", Toast.LENGTH_SHORT).show()
                        var intent=Intent(this@LoginActivity,MainActivity::class.java)
                        startActivity(intent)
                        finish()
                    }else{
                        Toast.makeText(this@LoginActivity,"Mail adresinizi onaylamadan giriş yapamazsınız", Toast.LENGTH_SHORT).show()
                    }
                }
            }
        }
    }