如何让 FirebaseAuth.AuthStateListener 在 Kotlin 中工作？

Question

class LoginActivity : AppCompatActivity() {

    private val firebaseAuth = FirebaseAuth.getInstance()
    private val firebaseAuthListener = FirebaseAuth.AuthStateListener {
        val user = firebaseAuth.currentUser?.uid
        user?.let {
            startActivity(HomeActivity.newIntent(this))
            finish()
        }
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_login)
        loginProgressLayout.setOnTouchListener { v, event -> true }
    }

    fun onLogin(v: View) {
        var proceed = true
        if (emailET.text.isNullOrEmpty()) {
            emailTIL.error = "email is required"
            emailTIL.isErrorEnabled = true
            proceed = false
        }
        if(passwordET.text.isNullOrEmpty()) {
            passwordTIL.error = "password is required"
            passwordTIL.isErrorEnabled = true
            proceed = false
        }
        if(proceed){
            loginProgressLayout.visibility = View.VISIBLE
            firebaseAuth.signInWithEmailAndPassword(emailET.text.toString(), passwordET.text.toString())
                .addOnCompleteListener { task ->
                    if (!task.isSuccessful){
                        loginProgressLayout.visibility = View.GONE
                        Toast.makeText(this@LoginActivity, "LoginError", Toast.LENGTH_SHORT).show()
                    }
                }
                .addOnFailureListener { exception ->
                    exception.printStackTrace()
                    loginProgressLayout.visibility = View.GONE
                }
        }
    } //onLogin end

我检查了我从firebaseAuth.signInWithEmailAndPassword 代码行获得了一些身份验证号码。 但我的问题是关于属性FirebaseAuth.AuthStateListener，它不起作用。 当我获得身份验证号码然后我希望AuthStateListener 工作时！

我阅读了 Firebase API，但它不起作用。我怎样才能使FirebaseAuth.AuthStateListener 工作？

Answer 1

您需要与您的听众联系addAuthStateListener才能使其工作。

例如在您的活动的onStart 中：

override fun onStart() {
    super.onStart()
    firebaseAuth!!.addAuthStateListener(this.firebaseAuthListener!!)
}

我建议研究这个答案（更多）：Android Studio (Kotlin) - User has to log back into app every time app is closed