如何返回数组而不是任务？

Question

在我的 ActivitySignup 中，我想调用 createUser 函数（来自我的 Firestore 类）。我希望createUser 将result 和message 返回到ActivitySignup。这将使我的 ActivitySignup 非常干净。我该怎么做？

ActivitySignup：

class ActivitySignup : AppCompatActivity() {

    private lateinit var user: String
    private lateinit var userEditTxt: EditText
    private lateinit var email: String
    private lateinit var emailEditTxt: EditText
    private lateinit var password: String
    private lateinit var passwordEditTxt: EditText
    private lateinit var backbutton: Button
    private lateinit var terms: CheckBox
    private lateinit var submitbutton: Button
    private lateinit var auth: FirebaseAuth
    private lateinit var currentDateTime: DateTime
    private val tag: String = "ActivitySignup"
    private lateinit var functions: FirebaseFunctions
    private lateinit var fs: FS

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_signup)

        fs = FS()

        submitbutton = findViewById(R.id.btn_submit)

        submitbutton.setOnClickListener() {
            Log.e(tag,"Clicked submit")

            userEditTxt = findViewById(R.id.et_user)
            user = userEditTxt.text.toString().trim()
            emailEditTxt = findViewById(R.id.et_email)
            email = emailEditTxt.text.toString().trim()
            passwordEditTxt = findViewById(R.id.et_password)
            password = passwordEditTxt.text.toString().trim()

            if (user.isNotEmpty() && email.isNotEmpty() && password.isNotEmpty()) {
//                fs.createUser(user, email, password)
//                    .continueWith { task ->
//                        if (task.isSuccessful) {
//                            Log.e(tag, "createUser task succeeded")
////                            Log.e(tag, "Result1: ${task.result?.get("result")}") //case sensitive
////                            Log.e(tag, "Result2: ${task.result. ("message")}") //case sensitive
//
//                            val taskResult = task.result //.get("result")
//                            val result = taskResult.getData
//                            val message = task.result?.get("message")
//
//                            val intent = Intent(this, ActivityGroups::class.java)
//                            startActivity(intent)
//                            finish()
//                        } else {
//                            Log.e(tag, "createUser task failed")
//                        }
//                    }
                var returnResult = fs.createUser(user, email, password)
                Log.e(tag, "returnResult[0]: ${returnResult[0]}")
                Log.e(tag, "returnResult[1]: ${returnResult[1]}")
                //Code continues only if result = 1...


            }

        }

    }

}

FS.createUser()：

fun createUser(user: String, email: String, password: String): Array<String> {
        Log.e(tag, "createUser()")
        val functions = Firebase.functions
        val auth = Firebase.auth
        var result: String
        var message: String

        auth.createUserWithEmailAndPassword(email, password)
            .continueWith() { task ->
                if (task.isSuccessful) {
                    Log.e(tag, "auth.createUserWithEmailAndPassword() successful")

                    var data = hashMapOf<String, String>()
                    data["user"] = user
                    data["email"] = email

                    functions.getHttpsCallable("createUser").call(data)
                        .continueWith() { task ->
                            if (task.isSuccessful) {
                                Log.e(tag, "CF_createUser task was successful")
                                Log.e(tag, "CF_createUser: ${task.result?.data.toString()}")
                                var returnData = task.result?.data.toString()
                                result = returnData[0].toString()
                                message = returnData[1].toString()
                                
                            } else {
                                Log.e(tag, "CF_createUser task failed")
                                Log.e(tag, "CF_createUser exception message: ${task.exception?.message}")
                                Log.e(tag, "CF_createUser exception localizedMessage: ${task.exception?.localizedMessage}")
                            }
                        }
                } else {
                    Log.e(tag, "auth.createUserWithEmailAndPassword() failed")
                    Log.e(tag, "authTask exception: ${task.exception.toString()}")
                }

            }
        return arrayOf(result, message)
    }

Answer 1

如果你看这里：

val functions = Firebase.functions
val auth = Firebase.auth
var result: String
var message: String

与 function 和 auth 不同，result 和 message 不是用值初始化的（即它们没有值）。您可以使用如下初始值初始化它们：

var result: String = ""
var message: String = ""

或late-initialize他们像这样：

lateinit var result: String
lateinit var message: String

这意味着这些 var 将在您的代码处理过程中获得一个值。

更新问题的更新：

auth.signInWithEmailAndPassword(email, password)
        .addOnCompleteListener(this) { task ->
            if (task.isSuccessful) {
                //Call your cloud function here
                //If Cloud functions returns desired response, proceed
                return arrayOf(result, message)
            }
        }