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Android Firebase登录注册应用启动崩溃，求AndroidX配置修复方案

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AI 小北
2026-8-24
问题描述

使用Firebase开发了登录、注册及主界面Activity，启动应用时出现大量异常，判断并非语法问题而是配置问题。

注册界面代码 

class RegistrationActivity : AppCompatActivity() {

    private lateinit var auth: FirebaseAuth

    //Email und Passwort Eingabefelder
    val regEmail: EditText = findViewById(R.id.registration_email)
    val regPassword: EditText = findViewById(R.id.registration_password)

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

        auth = FirebaseAuth.getInstance()

        //Button der gedrückt wird zum Registrieren nach dem man seine Daten eingegeben hat
        val registration_button: Button = findViewById(R.id.registration_button)
        registration_button.setOnClickListener {
            //WENN Button gedrückt DANN rufe FUNKTION auf
            createUser()
        }

        //Zurück zum login
        val login_texView: TextView = findViewById(R.id.loginLink_textView)
        login_texView.setOnClickListener {
            val intent_registration_activiy = Intent(this, RegistrationActivity::class.java)
            startActivity(intent_registration_activiy)
        }
    }

    /**
     * Function: createUser
     * Eingegebene Email und Passwort werden in Strings umgewandelt
     * Danach wird überprüft ob die Email und Passwort Felder leer sind
     * IF Leer DANN Error und Focus
     * SONST:
     * User wird erstellt mit eingegebener email und passwort
     * Es wird danach überprüft ob die Registrierung erfolgreich war oder nicht
     * WENN erfolgreich: Toast, Weiterleitung zum Login
     * SONST: Toast
     *
     */
    private fun createUser(){
        val email: String = regEmail.text.toString()
        val password: String = regPassword.text.toString()

        if(TextUtils.isEmpty(email)){
            regEmail.setError("E-mail kann nicht leer sein")
            regEmail.requestFocus()
        } else if(TextUtils.isEmpty(password)){
            regPassword.setError("Passwort kann nicht leer sein")
            regPassword.requestFocus()
        } else{
            auth.createUserWithEmailAndPassword(email, password).addOnCompleteListener { task ->
                if (task.isSuccessful){
                    val successfull_toast = Toast.makeText(this, "Registrierung erfolgreich", Toast.LENGTH_LONG)
                    successfull_toast.show()
                    val intent_logIn_activity = Intent(this, LoginActivity::class.java)
                    startActivity(intent_logIn_activity)
                } else {
                    val unsuccsessfull_toast = Toast.makeText(this, "Ein Fehler ist aufgetreten " + task.exception?.message, Toast.LENGTH_LONG)
                }
            }
        }
    }
}

登录界面代码 

class LoginActivity : AppCompatActivity() {

    private lateinit var auth: FirebaseAuth

    val logEmail: EditText = findViewById(R.id.userLogInEmail)                  //email zum einloggen
    val logPassword: EditText = findViewById(R.id.userLogInPassword)            //passwort zum einloggen
    val logButton: Button = findViewById(R.id.logIn_button)                     //Button zum einloggen
    val regLink: TextView = findViewById(R.id.registration_textView)            //Zur Registration Activity

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

        auth = FirebaseAuth.getInstance()

        //Login Button OnClick
        logButton.setOnClickListener {
            loginUser()
        }
        //Klicke und komme zur Registrations Activity
        regLink.setOnClickListener {
            val intent_regActivity = Intent(this, RegistrationActivity::class.java)
            startActivity(intent_regActivity)
        }
    }

    private fun loginUser(){
        val email: String = logEmail.text.toString()
        val password: String = logPassword.text.toString()

        if (TextUtils.isEmpty(email)){
            logEmail.setError("Email kann nicht leer sein")
            logEmail.requestFocus()
        } else if (TextUtils.isEmpty(password)){
            logPassword.setError("Passwort kann nicht leer sein")
            logPassword.requestFocus()
        } else {
            auth.signInWithEmailAndPassword(email, password).addOnCompleteListener { task ->
                if(task.isSuccessful){
                    val successfull_toast = Toast.makeText(this, "Login erfolgreich", Toast.LENGTH_LONG)
                    successfull_toast.show()
                    val intent_mainActivity = Intent(this, MainActivity::class.java)
                    startActivity(intent_mainActivity)
                } else {
                    val unsuccessfull_toast = Toast.makeText(this, "Login nicht möglich " + task.exception?.message, Toast.LENGTH_LONG)
                    unsuccessfull_toast.show()
                }
            }
        }
    }
}

主界面代码 

class MainActivity : AppCompatActivity() {
    private lateinit var auth: FirebaseAuth

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

        auth = FirebaseAuth.getInstance()
    }

    /**
     * Wenn die App startet wird überprüft ob der User angemeldet ist oder nicht bzw. einen Account hat
     * IF NOT gehe zur Login-Acitiviy
     */
    override fun onStart() {
        super.onStart()
        val user = auth.currentUser
        if(user == null){
            val intent = Intent(this, LoginActivity::class.java)
            startActivity(intent)
        }
    }
}

启动异常信息 

Caused by: com.android.builder.errors.EvalIssueException: Configuration `:app:debugRuntimeClasspath` contains AndroidX dependencies, but the `android.useAndroidX` property is not enabled, which may cause runtime issues.
Caused by: java.lang.RuntimeException: Manifest merger failed with multiple errors, see logs
Caused by: java.lang.RuntimeException: Duplicate class android.support.v4.app.INotificationSideChannel found in modules core-1.2.0-runtime (androidx.core:core:1.2.0) and support-compat-28.0.0-runtime (com.android.support:support-compat:28.0.0)
Configuration `:app:debugRuntimeClasspath` contains AndroidX dependencies, but the `android.useAndroidX` property is not enabled, which may cause runtime issues.
Set `android.useAndroidX=true` in the `gradle.properties` file and retry.
The following AndroidX dependencies are detected:
:app:debugRuntimeClasspath -> com.google.firebase:firebase-auth:21.0.6 -> androidx.browser:browser:1.4.0
:app:debugRuntimeClasspath -> com.google.firebase:firebase-auth:21.0.6 -> androidx.collection:collection:1.1.0
:app:debugRuntimeClasspath -> com.google.firebase:firebase-auth:21.0.6 -> androidx.browser:browser:1.4.0 -> androidx.annotation:annotation:1.1.0
:app:debugRuntimeClasspath -> com.google.firebase:firebase-auth:21.0.6 -> androidx.browser:browser:1.4.0 -> androidx.concurrent:concurrent-futures:1.0.0
:app:debugRuntimeClasspath -> com.google.firebase:firebase-auth:21.0.6 -> androidx.browser:browser:1.4.0 -> androidx.interpolator:interpolator:1.0.0
:app:debugRuntimeClasspath -> com.google.firebase:firebase-auth:21.0.6 -> androidx.browser:browser:1.4.0 -> androidx.core:core:1.2.0
:app:debugRuntimeClasspath -> com.google.firebase:firebase-auth:21.0.6 -> androidx.browser:browser:1.4.0 -> androidx.core:core:1.2.0 -> androidx.lifecycle:lifecycle-runtime:2.0.0
:app:debugRuntimeClasspath -> com.google.firebase:firebase-auth:21.0.6 -> androidx.browser:browser:1.4.0 -> androidx.core:core:1.2.0 -> androidx.lifecycle:lifecycle-runtime:2.0.0 -> androidx.lifecycle:lifecycle-common:2.0.0
:app:debugRuntimeClasspath -> com.google.firebase:firebase-auth:21.0.6 -> androidx.browser:browser:1.4.0 -> androidx.core:core:1.2.0 -> androidx.lifecycle:lifecycle-runtime:2.0.0 -> androidx.arch.core:core-common:2.0.0
:app:debugRuntimeClasspath -> com.google.firebase:firebase-auth:21.0.6 -> androidx.browser:browser:1.4.0 -> androidx.core:core:1.2.0 -> androidx.versionedparcelable:versionedparcelable:1.1.0
:app:debugRuntimeClasspath -> com.google.firebase:firebase-auth:21.0.6 -> androidx.fragment:fragment:1.0.0
:app:debugRuntimeClasspath -> com.google.firebase:firebase-auth:21.0.6 -> androidx.fragment:fragment:1.0.0 -> androidx.legacy:legacy-support-core-ui:1.0.0
:app:debugRuntimeClasspath -> com.google.firebase:firebase-auth:21.0.6 -> androidx.fragment:fragment:1.0.0 -> androidx.legacy:legacy-support-core-utils:1.0.0
:app:debugRuntimeClasspath -> com.google.firebase:firebase-auth:21.0.6 -> androidx.fragment:fragment:1.0.0 -> androidx.legacy:legacy-support-core-utils:1.0.0 -> androidx.documentfile:documentfile:1.0.0
:app:debugRuntimeClasspath -> com.google.firebase:firebase-auth:21.0.6 -> androidx.fragment:fragment:1.0.0 -> androidx.loader:loader:1.0.0
:app:debugRuntimeClasspath -> com.google.firebase:firebase-auth:21.0.6 -> androidx.fragment:fragment:1.0.0 -> androidx.loader:loader:1.0.0 -> androidx.lifecycle:lifecycle-livedata:2.0.0
:app:debugRuntimeClasspath -> com.google.firebase:firebase-auth:21.0.6 -> androidx.fragment:fragment:1.0.0 -> androidx.loader:loader:1.0.0 -> androidx.lifecycle:lifecycle-livedata:2.0.0 -> androidx.arch.core:core-runtime:2.0.0
:app:debugRuntimeClasspath -> com.google.firebase:firebase-auth:21.0.6 -> androidx.fragment:fragment:1.0.0 -> androidx.loader:loader:1.0.0 -> androidx.lifecycle:lifecycle-livedata:2.0.0 -> androidx.lifecycle:lifecycle-livedata-core:2.0.0
:app:debugRuntimeClasspath -> com.google.firebase:firebase-auth:21.0.6 -> androidx.fragment:fragment:1.0.0 -> androidx.lifecycle:lifecycle-viewmodel:2.0.0
:app:debugRuntimeClasspath -> com.google.firebase:firebase-auth:21.0.6 -> androidx.localbroadcastmanager:localbroadcastmanager:1.0.0
:app:debugRuntimeClasspath -> com.google.firebase:firebase-auth:21.0.6 -> androidx.fragment:fragment:1.0.0 -> androidx.legacy:legacy-support-core-utils:1.0.0 -> androidx.print:print:1.0.0
:app:debugRuntimeClasspath -> com.google.firebase:firebase-auth:21.0.6 -> androidx.fragment:fragment:1.0.0 -> androidx.legacy:legacy-support-core-ui:1.0.0 -> androidx.customview:customview:1.0.0
:app:debugRuntimeClasspath -> com.google.firebase:firebase-auth:21.0.6 -> androidx.fragment:fragment:1.0.0 -> androidx.legacy:legacy-support-core-ui:1.0.0 -> androidx.viewpager:viewpager:1.0.0
:app:debugRuntimeClasspath -> com.google.firebase:firebase-auth:21.0.6 -> androidx.fragment:fragment:1.0.0 -> androidx.legacy:legacy-support-core-ui:1.0.0 -> androidx.coordinatorlayout:coordinatorlayout:1.0.0
:app:debugRuntimeClasspath -> com.google.firebase:firebase-auth:21.0.6 -> androidx.fragment:fragment:1.0.0 -> androidx.legacy:legacy-support-core-ui:1.0.0 -> androidx.drawerlayout:drawerlayout:1.0.0
:app:debugRuntimeClasspath -> com.google.firebase:firebase-auth:21.0.6 -> androidx.fragment:fragment:1.0.0 -> androidx.legacy:legacy-support-core-ui:1.0.0 -> androidx.slidingpanelayout:slidingpanelayout:1.0.0
:app:debugRuntimeClasspath -> com.google.firebase:firebase-auth:21.0.6 -> androidx.fragment:fragment:1.0.0 -> androidx.legacy:legacy-support-core-ui:1.0.0 -> androidx.swiperefreshlayout:swiperefreshlayout:1.0.0
:app:debugRuntimeClasspath -> com.google.firebase:firebase-auth:21.0.6 -> androidx.fragment:fragment:1.0.0 -> androidx.legacy:legacy-support-core-ui:1.0.0 -> androidx.asynclayoutinflater:asynclayoutinflater:1.0.0
:app:debugRuntimeClasspath -> com.google.firebase:firebase-auth:21.0.6 -> androidx.fragment:fragment:1.0.0 -> androidx.legacy:legacy-support-core-ui:1.0.0 -> androidx.cursoradapter:cursoradapter:1.0.0

请问该如何解决此问题？

解决方案

一、解决AndroidX与Support库冲突问题

异常核心是项目同时引入AndroidX和旧版Support库，且未开启AndroidX支持，按以下步骤处理：

  1. 修改gradle.properties配置
    在项目根目录的gradle.properties文件中添加或修改以下两行：
android.useAndroidX=true
android.enableJetifier=true
  • android.useAndroidX=true：开启项目对AndroidX的支持
  • android.enableJetifier=true：自动将第三方依赖中的旧版Support库引用转换为AndroidX版本

  1. 迁移项目到AndroidX
    打开Android Studio，依次点击Refactor -> Migrate to AndroidX，按照向导完成迁移操作。这会自动替换代码、布局文件中所有旧版Support库的引用为AndroidX对应类。

  2. 清理依赖
    打开app/build.gradle文件，移除所有com.android.support开头的依赖，替换为对应的AndroidX依赖。例如：

  • 旧版com.android.support:appcompat-v7替换为androidx.appcompat:appcompat:1.6.1（版本号可根据需求选择最新稳定版）

二、修复代码逻辑错误

在RegistrationActivity的返回登录按钮点击事件中，错误地跳转到了自身，需修改为：

// 原错误代码
// val intent_registration_activiy = Intent(this, RegistrationActivity::class.java)
// startActivity(intent_registration_activiy)

// 修改后代码
val intent_login_activity = Intent(this, LoginActivity::class.java)
startActivity(intent_login_activity)

三、后续验证操作

  • 清理项目缓存：点击File -> Invalidate Caches / Restart，选择Invalidate and Restart
  • 重新构建项目：点击Build -> Rebuild Project
  • 确保Firebase Auth依赖使用最新稳定版，避免版本兼容问题

内容的提问来源于stack exchange，提问作者KayraOz

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最近更新时间：2026.08.24 12:48:22