使用时出错 Firebase Android Studio (kotlin)

Question

我正在尝试使用 Firebase 登录和注册创建一个项目，我现在正在尝试进行注册活动，我在此处附上代码：

import android.content.Intent
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.text.TextUtils
import android.view.View
import android.widget.EditText
import android.widget.ProgressBar
import android.widget.Toast
import com.google.firebase.auth.FirebaseAuth
import com.google.firebase.auth.FirebaseUser
import com.google.firebase.database.DatabaseReference
import com.google.firebase.database.FirebaseDatabase

class RegisterActivity : AppCompatActivity() {

    private lateinit var txtName:EditText
    private lateinit var txtLastName:EditText
    private lateinit var txtEmail:EditText
    private lateinit var txtPassword:EditText
    private lateinit var progressBar:ProgressBar
    private lateinit var dbReference:DatabaseReference
    private lateinit var database:FirebaseDatabase
    private lateinit var auth:FirebaseAuth

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

        txtName=findViewById(R.id.txtName)
        txtLastName=findViewById(R.id.txtLastName)
        txtEmail=findViewById(R.id.txtEmail)
        txtPassword=findViewById(R.id.txtPassword)

        progressBar=findViewById(R.id.progressBar)

        database= FirebaseDatabase.getInstance()
        auth= FirebaseAuth.getInstance()

        dbReference=database.reference.child("Usuarios")

    }

    fun registrarse(view:View){
        createNewAccount()
    }
    fun login(view:View) {
        startActivity(Intent(this,LoginActivity::class.java))
    }
    private fun createNewAccount(){
        val name:String=txtName.text.toString()
        val lastName:String=txtLastName.text.toString()
        val email:String=txtEmail.text.toString()
        val password:String=txtPassword.text.toString()

        if(!TextUtils.isEmpty(name) && !TextUtils.isEmpty(lastName) && !TextUtils.isEmpty(email) && !TextUtils.isEmpty(password)){
            progressBar.visibility=View.VISIBLE

            auth.createUserWithEmailAndPassword(email,password)
                    ?.addOnCompleteListener(this){

                        task ->

                        if(task.isComplete){
                            val user:FirebaseUser?=auth.currentUser
                            verifyEmail(user)

                            val userBD=dbReference.child(user?.uid)

                            userBD.child("Nombre").setValue(name)
                            userBD.child("Apellidos").setValue(lastName)
                            userBD.child("Correo electrónico").setValue(email)
                            action()
                        }

                    }
        }



    }
    private fun verifyEmail(user:FirebaseUser?){
        user?.sendEmailVerification()
                ?.addOnCompleteListener(this){
                    task ->

                    if(task.isComplete){
                        Toast.makeText(this, "Correo de verificación enviado.",Toast.LENGTH_LONG).show()
                    }
                    else{
                        Toast.makeText(this, "Error al enviar el correo de verificación.",Toast.LENGTH_LONG).show()
                    }
                }
    }
    private fun action(){
        startActivity(Intent(this,LoginActivity::class.java))
    }

}

当我按下“registrarse”按钮时，应用程序崩溃了……我的 gradle 文件（应用程序）如下：

apply plugin: 'com.android.application'

apply plugin: 'kotlin-android'

apply plugin: 'kotlin-android-extensions'

android {
    compileSdkVersion 26
    defaultConfig {
        applicationId "com.example.uburr.hastalos"
        minSdkVersion 24
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
    implementation 'com.android.support:appcompat-v7:26.1.0'
    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.1'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
    implementation 'com.google.firebase:firebase-core:12.0.1'
    implementation 'com.google.firebase:firebase-database:12.0.1'
    implementation 'com.google.firebase:firebase-auth:12.0.1'
    implementation 'com.google.firebase:firebase-storage:12.0.1'
    implementation 'com.google.firebase:firebase-messaging:12.0.1'

}
apply plugin: 'com.google.gms.google-services'

编译器没有显示任何错误。 我是新手，所以我真的不知道如何解决这个问题......我正在努力学习，我认为这个论坛会对我有所帮助，我将非常感谢所有试图提供帮助的人。

03-30 17:23:03.636 12627-12627/com.example.uburr.hastalos E/AndroidRuntime：致命异常：主进程：com.example.uburr.hastalos，PID：12627 java.lang.NullPoint passer null for argument 'pathString' in child() at com.google.firebase.database.DatabaseReference.child(Unknown Source) at com.example.uburr.hastalos.RegisterActivity$createNewAccount$1.onComplete(RegisterActivity.kt:69) at com .google.android.gms.tasks.zzf.run(Unknown Source) at android.os.Handler.handleCallback(Handler.java:751) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os .Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6119) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller .run(ZygoteInit.java:886) 在 88168970 007088.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) 03-30 17:23:14.789 12627-12733/com.example.uburr.hastalos I/Adreno: DequeueBuffer0:dequeueBuffer3 失败14.789 12627-12733/com.example.uburr.hastalos I/Adreno：DequeueBuffer：dequeueBuffer 失败 03-30 17：23：14.793 12627-12733/com.example.uburr.hastalos W/OpenGLRenderer：swapBuffers 在 0f27380b9 上遇到 EGL 错误 12301 , 停止渲染...

非常感谢，米格尔天使。

Answer 1

问题出在这里，您正在检查任务是否完成，然后尝试访问用户，但是如果任务未成功，则用户将为空：

 if(task.isComplete){
                            val user:FirebaseUser?=auth.currentUser
                            verifyEmail(user)

                            val userBD=dbReference.child(user?.uid)

                            userBD.child("Nombre").setValue(name)
                            userBD.child("Apellidos").setValue(lastName)
                            userBD.child("Correo electrónico").setValue(email)
                            action()
                        }

您应该改而做，检查任务是否成功，然后对其执行操作：

if(task.isSuccessful){
                            val user:FirebaseUser?=auth.currentUser
                            verifyEmail(user)

                            val userBD=dbReference.child(user?.uid)

                            userBD.child("Nombre").setValue(name)
                            userBD.child("Apellidos").setValue(lastName)
                            userBD.child("Correo electrónico").setValue(email)
                            action()
                        }

Answer 2

您需要添加您的 gradle (:app) > dependencies

实施 'com.google.firebase:firebase-auth-ktx'