제가 안드로이드 스튜디오를 처음사용해봅니다그래서 첫 프로젝트 생성 후 Hello World 뜨는걸 테스트를 해보고싶어서 AVD? 설정을이래 하고 실행버튼을 눌렀는데 맨 위 사진처럼 오류가 발생해서 실행이 안되는것같습니다 무엇이 문제인가요 ㅠ

안드로이드 스튜디오 arctic fox를 다운받고 첫 프로젝트를 생성했는데 코드가 쭉 빨간줄이 쳐지면서 밑에 사진과 같이 32개정도의 오류가 생기네요 뭐가 문제일까요? 아 그리고 이건 오류랑 다른 질문인데저 arctic fox 버전에서 새로운 프로젝트를 생성했을때 생성되는 기본코드랑지금 최신 버전인 Hedgehog 버전에서 만들어지는 기본코드랑 다르던데 원래 그런걸까요? 강의를 들을때 기본코드가 달라서 헷갈리더라구요

 AnnotationConfigWebApplicationContext 익명함수가 잘 만들어지시나요?저 같은 경우에 어떤 문제인지 모르겠는데 익명함수를 만들면 setClassLoader() 메소드를 오버라이딩하라는 컴파일 에러를 만나게 됩니다.찾아본 결과 부모 클래스인 DefaultResourceLoader 에서 해당 메소드를 이미 구현하고 있는데 왜 다시 구현하라는지 모르겠습니다.심지어 아래와 같이 overriding 해도 에러가 발생합니다. fun main(args: Array<String>) { val applicationContext = object : AnnotationConfigWebApplicationContext() { @Override override fun onRefresh() { super.onRefresh() val tomcatWebServerFactory = TomcatServletWebServerFactory() val webServer = tomcatWebServerFactory.getWebServer({ servletContext -> servletContext.addServlet("dispatcherServlet", object : DispatcherServlet(this) { }).addMapping("/*") }) webServer.start() } @Override override fun setClassLoader(classLoader: ClassLoader) { super.setClassLoader(classLoader) } } applicationContext.apply { refresh() } } 이런 에러가 발생합니다. fun setClassLoader(classLoader: ClassLoader): Unit defined in tobyspring.helloboot.main.<no name provided> fun setClassLoader(classLoader: ClassLoader?): Unit defined in tobyspring.helloboot.main.<no name provided>  해결하신분이 계시다면 꼭 부탁 드리겠습니다..!

안녕하세요 강의를 따라서 진행하고 있는데 회원가입 버튼을 누르면 토스트 메시지로 no 가 뜨고 이메일과 비밀번호로 회원가입이 되지 않습니다.gradle(app) 파일plugins { id 'com.android.application' id 'org.jetbrains.kotlin.android' id 'com.google.gms.google-services' } android { namespace 'com.example.sample' compileSdk 33 defaultConfig { applicationId "com.example.sample" minSdk 21 targetSdk 33 versionCode 1 versionName "1.0" testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro' } } compileOptions { sourceCompatibility JavaVersion.VERSION_1_8 targetCompatibility JavaVersion.VERSION_1_8 } kotlinOptions { jvmTarget = '1.8' } } dependencies { implementation 'com.google.firebase:firebase-auth-ktx' implementation platform('com.google.firebase:firebase-bom:31.1.1') implementation 'com.google.firebase:firebase-analytics-ktx' implementation 'androidx.core:core-ktx:1.9.0' implementation 'androidx.appcompat:appcompat:1.5.1' implementation 'com.google.android.material:material:1.7.0' implementation 'androidx.constraintlayout:constraintlayout:2.1.4' testImplementation 'junit:junit:4.13.2' androidTestImplementation 'androidx.test.ext:junit:1.1.4' androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.0' } gradle(프로젝트)// Top-level build file where you can add configuration options common to all sub-projects/modules. buildscript { repositories { google() mavenCentral() } dependencies { classpath 'com.google.gms:google-services:4.3.14' } } plugins { id 'com.android.application' version '7.3.1' apply false id 'com.android.library' version '7.3.1' apply false id 'org.jetbrains.kotlin.android' version '1.7.20' apply false } MainActivity.ktpackage com.example.sample import android.icu.lang.UCharacter.GraphemeClusterBreak.T import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.widget.Button import android.widget.Toast import com.google.firebase.auth.FirebaseAuth import com.google.firebase.auth.ktx.auth import com.google.firebase.ktx.Firebase class MainActivity : AppCompatActivity() { private lateinit var auth: FirebaseAuth override fun onCreate(savedInstanceState: Bundle?) { // Initialize Firebase Auth auth = Firebase.auth super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val joinBtnClicked = findViewById<Button>(R.id.joinBtn) joinBtnClicked.setOnClickListener{ auth.createUserWithEmailAndPassword("abc1@abc1.com", "1234") .addOnCompleteListener(this) { task -> if (task.isSuccessful) { Toast.makeText(this,"ok",Toast.LENGTH_SHORT).show() } else { Toast.makeText(this,"no",Toast.LENGTH_SHORT).show() } } } } }혹시 코드 상에서 잘못된 부분이 있을까요?

안녕하세요 !! 자바 개발자가 되기 위해 학습하다가 코틀린을 새로 배우는 과정에서 이 강의를 듣게 된 학생입니다!!먼저 좋은 강의 제공해주셔서 정말 감사합니다!!멀티 모듈에서 Repository를 각각 api 모듈에 맞게 구현하고, Spring Data JPA Repository를 코어 모듈에 둔다고 하셨는데. 이런 경우에는 api 모듈에서 core와 관련된 그래들 설정(Querydsl or db 등)이 들어가겠구나 라는 생각이 들었습니다. 멀티 모듈의 장점 중 하나가 모듈의 역할에 맞게 의존성을 관리하는 것도 있다고 생각하는데, 이런 경우 이 장점을 잃지는 않을까 우려됩니다.그래서 저는 멀티모듈을 사용할 때, core 모듈에 Repository와 관련한 코드를 놓고, 사용하는 모듈에서 인터페이스, 혹은 Repository를 참조하는 구현체를 만들어 해당 클래스만 사용하게끔 유지하는 게 좋지 않을까 생각하는 편인데요. 혹시 강사님의 의견은 어떠신지 궁금합니다!!(적고 보니 강의 내용과는 조금 다른 질문인 것 같아 조금 죄송스럽네요 ㅠㅠ)

안녕하세요 자바에서 코틀린으로 넘어가고 싶어 강의를 들으며 차근차근 공부중입니다.인텔리제이에서 option + command + v 단축키를 사용하면 바로 리턴 타입을 알 수 있어서 자바 개발을 할 때 자주 사용 했습니다. 하지만 코틀린은 기본적으로 타입의 명시가 생략되어 있어서 그런지 같은 단축키로 리턴타입이 나오지 않더라구요기존 자바의 경우"ABC".startsWith("A"); 에 option + command + v 를 사용하면boolean a = "ABC".startsWith("A"); 이렇게 startsWith()의 리턴 값이 boolean이라는 것을 알 수 있는데코틀린의 경우val startsWith = "ABC".startsWith("A") 이렇게 나옵니다.제 생각에는val startsWith: Boolean = "ABC".startsWith("A")이런식으로 나와야 할 것 같은데 말이죠물론 메서드에 마우스를 올리면 리턴 타입을 알 수 있지만자바 개발하면서 익숙해진 단축키라 코틀린에서도 유용하게 활용할 수 있는지 궁금합니다.그리고 실무에서 개발 할 때에도 리턴타입이 없다면 많이 불편할 것 같은데 아직 자바에서 벗어나지 못해하는 걱정인걸까요...?

Build file '/Users/yujeong/AndroidStudioProjects/app/build.gradle' line: 7   A problem occurred evaluating project ':app'. > No signature of method: build_7daydxdgxe23wkg697tbxhdtc.android() is applicable for argument types: (build_7daydxdgxe23wkg697tbxhdtc$_run_closure1) values: [build_7daydxdgxe23wkg697tbxhdtc$_run_closure1@698aa7e3]   * Try: Run with --info or --debug option to get more log output. Run with --scan to get full insights.   * Exception is: org.gradle.api.GradleScriptException: A problem occurred evaluating project ':app'. at org.gradle.groovy.scripts.internal.DefaultScriptRunnerFactory$ScriptRunnerImpl.run(DefaultScriptRunnerFactory.java:93) at org.gradle.configuration.DefaultScriptPluginFactory$ScriptPluginImpl.lambda$apply$0(DefaultScriptPluginFactory.java:133) at org.gradle.configuration.ProjectScriptTarget.addConfiguration(ProjectScriptTarget.java:77) at org.gradle.configuration.DefaultScriptPluginFactory$ScriptPluginImpl.apply(DefaultScriptPluginFactory.java:136) at org.gradle.configuration.BuildOperationScriptPlugin$1.run(BuildOperationScriptPlugin.java:65) at org.gradle.internal.operations.DefaultBuildOperationRunner$1.execute(DefaultBuildOperationRunner.java:29) at org.gradle.internal.operations.DefaultBuildOperationRunner$1.execute(DefaultBuildOperationRunner.java:26) at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:75) at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:68) at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:153) at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:68) at org.gradle.internal.operations.DefaultBuildOperationRunner.run(DefaultBuildOperationRunner.java:56) at org.gradle.internal.operations.DefaultBuildOperationExecutor.lambda$run$1(DefaultBuildOperationExecutor.java:71) at org.gradle.internal.operations.UnmanagedBuildOperationWrapper.runWithUnmanagedSupport(UnmanagedBuildOperationWrapper.java:45) at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:71) at org.gradle.configuration.BuildOperationScriptPlugin.lambda$apply$0(BuildOperationScriptPlugin.java:62) at org.gradle.configuration.internal.DefaultUserCodeApplicationContext.apply(DefaultUserCodeApplicationContext.java:43) at org.gradle.configuration.BuildOperationScriptPlugin.apply(BuildOperationScriptPlugin.java:62) at org.gradle.api.internal.project.DefaultProjectStateRegistry$ProjectStateImpl.lambda$applyToMutableState$0(DefaultProjectStateRegistry.java:250) at org.gradle.api.internal.project.DefaultProjectStateRegistry$ProjectStateImpl.fromMutableState(DefaultProjectStateRegistry.java:277) at org.gradle.api.internal.project.DefaultProjectStateRegistry$ProjectStateImpl.applyToMutableState(DefaultProjectStateRegistry.java:249) at org.gradle.configuration.project.BuildScriptProcessor.execute(BuildScriptProcessor.java:42) at org.gradle.configuration.project.BuildScriptProcessor.execute(BuildScriptProcessor.java:26) at org.gradle.configuration.project.ConfigureActionsProjectEvaluator.evaluate(ConfigureActionsProjectEvaluator.java:35) at org.gradle.configuration.project.LifecycleProjectEvaluator$EvaluateProject.lambda$run$0(LifecycleProjectEvaluator.java:100) at org.gradle.api.internal.project.DefaultProjectStateRegistry$ProjectStateImpl.lambda$applyToMutableState$0(DefaultProjectStateRegistry.java:250) at org.gradle.api.internal.project.DefaultProjectStateRegistry$ProjectStateImpl.lambda$withProjectLock$3(DefaultProjectStateRegistry.java:310) at org.gradle.internal.work.DefaultWorkerLeaseService.withLocks(DefaultWorkerLeaseService.java:213) at org.gradle.api.internal.project.DefaultProjectStateRegistry$ProjectStateImpl.withProjectLock(DefaultProjectStateRegistry.java:310) at org.gradle.api.internal.project.DefaultProjectStateRegistry$ProjectStateImpl.fromMutableState(DefaultProjectStateRegistry.java:291) at org.gradle.api.internal.project.DefaultProjectStateRegistry$ProjectStateImpl.applyToMutableState(DefaultProjectStateRegistry.java:249) at org.gradle.configuration.project.LifecycleProjectEvaluator$EvaluateProject.run(LifecycleProjectEvaluator.java:91) at org.gradle.internal.operations.DefaultBuildOperationRunner$1.execute(DefaultBuildOperationRunner.java:29) at org.gradle.internal.operations.DefaultBuildOperationRunner$1.execute(DefaultBuildOperationRunner.java:26) at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:75) at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:68) at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:153) at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:68) at org.gradle.internal.operations.DefaultBuildOperationRunner.run(DefaultBuildOperationRunner.java:56) at org.gradle.internal.operations.DefaultBuildOperationExecutor.lambda$run$1(DefaultBuildOperationExecutor.java:71) at org.gradle.internal.operations.UnmanagedBuildOperationWrapper.runWithUnmanagedSupport(UnmanagedBuildOperationWrapper.java:45) at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:71) at org.gradle.configuration.project.LifecycleProjectEvaluator.evaluate(LifecycleProjectEvaluator.java:63) at org.gradle.api.internal.project.DefaultProject.evaluate(DefaultProject.java:723) at org.gradle.api.internal.project.DefaultProject.evaluate(DefaultProject.java:150) at org.gradle.execution.TaskPathProjectEvaluator.configure(TaskPathProjectEvaluator.java:41) at org.gradle.execution.TaskPathProjectEvaluator.configureHierarchy(TaskPathProjectEvaluator.java:69) at org.gradle.configuration.DefaultProjectsPreparer.prepareProjects(DefaultProjectsPreparer.java:46) at org.gradle.configuration.BuildTreePreparingProjectsPreparer.prepareProjects(BuildTreePreparingProjectsPreparer.java:64) at org.gradle.configuration.BuildOperationFiringProjectsPreparer$ConfigureBuild.run(BuildOperationFiringProjectsPreparer.java:52) at org.gradle.internal.operations.DefaultBuildOperationRunner$1.execute(DefaultBuildOperationRunner.java:29) at org.gradle.internal.operations.DefaultBuildOperationRunner$1.execute(DefaultBuildOperationRunner.java:26) at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:75) at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:68) at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:153) at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:68) at org.gradle.internal.operations.DefaultBuildOperationRunner.run(DefaultBuildOperationRunner.java:56) at org.gradle.internal.operations.DefaultBuildOperationExecutor.lambda$run$1(DefaultBuildOperationExecutor.java:71) at org.gradle.internal.operations.UnmanagedBuildOperationWrapper.runWithUnmanagedSupport(UnmanagedBuildOperationWrapper.java:45) at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:71) at org.gradle.configuration.BuildOperationFiringProjectsPreparer.prepareProjects(BuildOperationFiringProjectsPreparer.java:40) at org.gradle.initialization.DefaultGradleLauncher.prepareProjects(DefaultGradleLauncher.java:226) at org.gradle.initialization.DefaultGradleLauncher.doClassicBuildStages(DefaultGradleLauncher.java:164) at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:149) at org.gradle.initialization.DefaultGradleLauncher.executeTasks(DefaultGradleLauncher.java:125) at org.gradle.internal.invocation.GradleBuildController$1.create(GradleBuildController.java:71) at org.gradle.internal.work.DefaultWorkerLeaseService.withLocks(DefaultWorkerLeaseService.java:213) at org.gradle.internal.invocation.GradleBuildController.doBuild(GradleBuildController.java:67) at org.gradle.internal.invocation.GradleBuildController.run(GradleBuildController.java:56) at org.gradle.tooling.internal.provider.runner.AbstractClientProvidedBuildActionRunner.runClientAction(AbstractClientProvidedBuildActionRunner.java:53) at org.gradle.tooling.internal.provider.runner.ClientProvidedPhasedActionRunner.run(ClientProvidedPhasedActionRunner.java:47) at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35) at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35) at org.gradle.launcher.exec.BuildOutcomeReportingBuildActionRunner.run(BuildOutcomeReportingBuildActionRunner.java:66) at org.gradle.tooling.internal.provider.ValidatingBuildActionRunner.run(ValidatingBuildActionRunner.java:32) at org.gradle.tooling.internal.provider.FileSystemWatchingBuildActionRunner.run(FileSystemWatchingBuildActionRunner.java:90) at org.gradle.launcher.exec.BuildCompletionNotifyingBuildActionRunner.run(BuildCompletionNotifyingBuildActionRunner.java:41) at org.gradle.launcher.exec.RunAsBuildOperationBuildActionRunner$3.call(RunAsBuildOperationBuildActionRunner.java:49) at org.gradle.launcher.exec.RunAsBuildOperationBuildActionRunner$3.call(RunAsBuildOperationBuildActionRunner.java:44) at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:200) at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:195) at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:75) at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:68) at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:153) at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:68) at org.gradle.internal.operations.DefaultBuildOperationRunner.call(DefaultBuildOperationRunner.java:62) at org.gradle.internal.operations.DefaultBuildOperationExecutor.lambda$call$2(DefaultBuildOperationExecutor.java:76) at org.gradle.internal.operations.UnmanagedBuildOperationWrapper.callWithUnmanagedSupport(UnmanagedBuildOperationWrapper.java:54) at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:76) at org.gradle.launcher.exec.RunAsBuildOperationBuildActionRunner.run(RunAsBuildOperationBuildActionRunner.java:44) at org.gradle.launcher.exec.InProcessBuildActionExecuter.lambda$execute$0(InProcessBuildActionExecuter.java:59) at org.gradle.composite.internal.DefaultRootBuildState.run(DefaultRootBuildState.java:86) at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:58) at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:30) at org.gradle.launcher.exec.BuildTreeScopeLifecycleBuildActionExecuter.lambda$execute$0(BuildTreeScopeLifecycleBuildActionExecuter.java:34) at org.gradle.internal.buildtree.BuildTreeState.run(BuildTreeState.java:53) at org.gradle.launcher.exec.BuildTreeScopeLifecycleBuildActionExecuter.execute(BuildTreeScopeLifecycleBuildActionExecuter.java:33) at org.gradle.launcher.exec.BuildTreeScopeLifecycleBuildActionExecuter.execute(BuildTreeScopeLifecycleBuildActionExecuter.java:28) at org.gradle.tooling.internal.provider.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:104) at org.gradle.tooling.internal.provider.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:55) at org.gradle.tooling.internal.provider.SubscribableBuildActionExecuter.execute(SubscribableBuildActionExecuter.java:64) at org.gradle.tooling.internal.provider.SubscribableBuildActionExecuter.execute(SubscribableBuildActionExecuter.java:37) at org.gradle.tooling.internal.provider.SessionScopeLifecycleBuildActionExecuter.lambda$execute$0(SessionScopeLifecycleBuildActionExecuter.java:54) at org.gradle.internal.session.BuildSessionState.run(BuildSessionState.java:67) at org.gradle.tooling.internal.provider.SessionScopeLifecycleBuildActionExecuter.execute(SessionScopeLifecycleBuildActionExecuter.java:50) at org.gradle.tooling.internal.provider.SessionScopeLifecycleBuildActionExecuter.execute(SessionScopeLifecycleBuildActionExecuter.java:36) at org.gradle.tooling.internal.provider.GradleThreadBuildActionExecuter.execute(GradleThreadBuildActionExecuter.java:36) at org.gradle.tooling.internal.provider.GradleThreadBuildActionExecuter.execute(GradleThreadBuildActionExecuter.java:25) at org.gradle.tooling.internal.provider.StartParamsValidatingActionExecuter.execute(StartParamsValidatingActionExecuter.java:59) at org.gradle.tooling.internal.provider.StartParamsValidatingActionExecuter.execute(StartParamsValidatingActionExecuter.java:31) at org.gradle.tooling.internal.provider.SessionFailureReportingActionExecuter.execute(SessionFailureReportingActionExecuter.java:58) at org.gradle.tooling.internal.provider.SessionFailureReportingActionExecuter.execute(SessionFailureReportingActionExecuter.java:42) at org.gradle.tooling.internal.provider.SetupLoggingActionExecuter.execute(SetupLoggingActionExecuter.java:47) at org.gradle.tooling.internal.provider.SetupLoggingActionExecuter.execute(SetupLoggingActionExecuter.java:31) at org.gradle.launcher.daemon.server.exec.ExecuteBuild.doBuild(ExecuteBuild.java:65) at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:37) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:104) at org.gradle.launcher.daemon.server.exec.WatchForDisconnection.execute(WatchForDisconnection.java:39) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:104) at org.gradle.launcher.daemon.server.exec.ResetDeprecationLogger.execute(ResetDeprecationLogger.java:29) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:104) at org.gradle.launcher.daemon.server.exec.RequestStopIfSingleUsedDaemon.execute(RequestStopIfSingleUsedDaemon.java:35) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:104) at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.create(ForwardClientInput.java:78) at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.create(ForwardClientInput.java:75) at org.gradle.util.Swapper.swap(Swapper.java:38) at org.gradle.launcher.daemon.server.exec.ForwardClientInput.execute(ForwardClientInput.java:75) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:104) at org.gradle.launcher.daemon.server.exec.LogAndCheckHealth.execute(LogAndCheckHealth.java:55) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:104) at org.gradle.launcher.daemon.server.exec.LogToClient.doBuild(LogToClient.java:63) at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:37) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:104) at org.gradle.launcher.daemon.server.exec.EstablishBuildEnvironment.doBuild(EstablishBuildEnvironment.java:84) at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:37) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:104) at org.gradle.launcher.daemon.server.exec.StartBuildOrRespondWithBusy$1.run(StartBuildOrRespondWithBusy.java:52) at org.gradle.launcher.daemon.server.DaemonStateCoordinator$1.run(DaemonStateCoordinator.java:297) at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64) at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:48) at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:56) Caused by: groovy.lang.MissingMethodException: No signature of method: build_7daydxdgxe23wkg697tbxhdtc.android() is applicable for argument types: (build_7daydxdgxe23wkg697tbxhdtc$_run_closure1) values: [build_7daydxdgxe23wkg697tbxhdtc$_run_closure1@698aa7e3] at build_7daydxdgxe23wkg697tbxhdtc.run(/Users/yujeong/AndroidStudioProjects/app/build.gradle:7) at org.gradle.groovy.scripts.internal.DefaultScriptRunnerFactory$ScriptRunnerImpl.run(DefaultScriptRunnerFactory.java:91) ... 140 more

앱을 개발하고 출시하는데 있어 API가 필수여서 이런 질문을 드립니다.

안녕하세요.  CustomAdapter 강의 수강중에 다음과 같은 에러가 발생해서 문의드립니다.   그대로 따라하면서 진행하였는데 이상하다 싶어서 에러 메시지를 확인해보니, 아래 코드에서 rowtextview1 변수에 null이 반환되고 있음을 확인하였습니다. val rowtextview1 = findViewById<TextView>(R.id.rowtextView1)   전체 코드는 아래와 같습니다. 어떻게하면 View의 id값을 정상적으로 가져올 수 있을까요?? * MainActivity.kt * package com.example.customadapterimport androidx.appcompat.app.AppCompatActivityimport android.os.Bundleimport android.util.Logimport android.view.Viewimport android.view.ViewGroupimport android.widget.BaseAdapterimport android.widget.Buttonimport android.widget.ListViewimport android.widget.TextViewclass MainActivity : AppCompatActivity() { val data1 = arrayOf("데이터1","데이터2","데이터3","데이터4","데이터5") override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val textveiw1 = findViewById<TextView>(R.id.textView1) val listveiw1 = findViewById<ListView>(R.id.list1) listveiw1.adapter = adapter1 } //getCount의 리턴 값 만큼 getView가 호출되어 R.layout.row의 View 객체를 붙여준다. val adapter1 = object : BaseAdapter(){ // 항목의 개수를 반환 override fun getCount(): Int { return data1.size } // 항목의 인덱스 번호를 전달했을 때, 객체를 넘기는 기능 override fun getItem(position: Int): Any? { return null } // 임의로 정해진 아이디 값을 넘겨주는 기능 override fun getItemId(position: Int): Long { return 0 } // 현재 화면에 표시되는 항목만큼 호출됨 // position : 몇 번째 항목을 구성할 것인가, convertView : 화면에서 없어진 뷰를 저장 override fun getView(position: Int, convertView: View?, parent: ViewGroup?): View { // 재사용 가능한 View를 변수에 담는다. var rowView = convertView if(rowView == null) { // inflate는 XML을 참고하여 View 객체를 생성 및 반환하는 함수 // 1번째 인자는 View 객체를 만들 때 참고하는 XML, 2번째 인자는 해당 View 객체의 상위 객체(레이아웃)\ rowView = layoutInflater.inflate(R.layout.row, null) } // 항목 뷰 내부에 배치되어 있는 뷰들의 주소 값을 가져온다. val rowtextview1 = findViewById<TextView>(R.id.rowtextView1) rowtextview1.text = data1[position] return rowView!! } }} * activity_main.xml * <?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context=".MainActivity" > <TextView android:id="@+id/textView1" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="TextView" android:textAppearance="@style/TextAppearance.AppCompat.Large" /> <ListView android:id="@+id/list1" android:layout_width="match_parent" android:layout_height="match_parent" /></LinearLayout> * row.xml * <?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal"> <TextView android:id="@+id/rowtextView1" android:layout_width="wrap_content" android:layout_height="40dp" android:layout_weight="1" android:text="TextView" android:textAppearance="@style/TextAppearance.AppCompat.Large" /> <Button android:id="@+id/rowbutton1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="버튼1" /> <Button android:id="@+id/rowbutton2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="버튼2" /></LinearLayout>      

강의 5분 10초에서 model의 형태로 데이터를 받는다고 하는데 저 model 클래스를 잘 모르겠고, 저 model 의 형태로 데이터를 받으면 왜 1, 12, 123 데이터를 가져올 수 있는지 궁금합니다! 또한 for문안에 children의 의미도 알고 싶습니다.!

안녕하세요 코린이입니다 ㅎ 이번에 만들어 보고 싶은 앱이 있어서 친구들과 함께 만들어보려고 하는데, 어떻게 아키텍쳐를 구상할지 모르겠는 와중에 궁금한 점이 생겨서 질문드립니다. 코틀린으로 백엔드, 프론트엔드가 모두 대체 가능한가요? 코틀린을 다룰줄 알면 다른 언어는 배우지 않아도 되나요? 이상입니다. 감사합니다