私はKotlinを使ってFirebase認証登録ページを作っています、そしてアプリを実行している間に実行時エラーがあります。 3行目と14行目を見てください私は問題があるものを理解することができません。
添付のコードが必要な場合は、メインコードを添付していません。
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.login, PID: 7505
Java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.login/com.example.login.Register}: Java.lang.IllegalStateException: Default FirebaseApp is not initialized in this process com.example.login. Make sure to call FirebaseApp.initializeApp(Context) first.
at Android.app.ActivityThread.performLaunchActivity(ActivityThread.Java:2567)
at Android.app.ActivityThread.handleLaunchActivity(ActivityThread.Java:2726)
at Android.app.ActivityThread.-wrap12(ActivityThread.Java)
at Android.app.ActivityThread$H.handleMessage(ActivityThread.Java:1477)
at Android.os.Handler.dispatchMessage(Handler.Java:102)
at Android.os.Looper.loop(Looper.Java:154)
at Android.app.ActivityThread.main(ActivityThread.Java:6119)
at Java.lang.reflect.Method.invoke(Native Method)
at com.Android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.Java:886)
at com.Android.internal.os.ZygoteInit.main(ZygoteInit.Java:776)
Caused by: Java.lang.IllegalStateException: Default FirebaseApp is not initialized in this process com.example.login. Make sure to call FirebaseApp.initializeApp(Context) first.
at com.google.firebase.FirebaseApp.getInstance(SourceFile:218)
at com.google.firebase.auth.FirebaseAuth.getInstance(Unknown Source)
at com.example.login.Register.<init>(Register.kt:15)
at Java.lang.Class.newInstance(Native Method)
at Android.app.Instrumentation.newActivity(Instrumentation.Java:1078)
at Android.app.ActivityThread.performLaunchActivity(ActivityThread.Java:2557)
at Android.app.ActivityThread.handleLaunchActivity(ActivityThread.Java:2726)
at Android.app.ActivityThread.-wrap12(ActivityThread.Java)
at Android.app.ActivityThread$H.handleMessage(ActivityThread.Java:1477)
at Android.os.Handler.dispatchMessage(Handler.Java:102)
at Android.os.Looper.loop(Looper.Java:154)
at Android.app.ActivityThread.main(ActivityThread.Java:6119)
at Java.lang.reflect.Method.invoke(Native Method)
at com.Android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.Java:886)
at com.Android.internal.os.ZygoteInit.main(ZygoteInit.Java:776)
Application terminated.
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実装
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
implementation 'com.Android.support:appcompat-v7:28.0.0'
implementation 'com.Android.support.constraint:constraint-layout:1.1.3'
implementation 'com.google.firebase:firebase-auth:16.0.3'
implementation 'com.google.firebase:firebase-database:16.0.1'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.Android.support.test:runner:1.0.2'
androidTestImplementation 'com.Android.support.test.espresso:espresso-core:3.0.2'
}
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プロジェクトレベルのbuild.gradleで行を下回る代わりに、それをApp Level Gradleに追加します。
プラグインを適用する: 'com.google.gms.google-Services'
この行を追加build.gradle(Project)
_ classpath 'com.google.gms:google-services:4.3.3'
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そしてこのプラグインを追加しますbuild.gradle(module)
_apply plugin: 'com.google.gms.google-services'
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