问FirebaseAuth.getInstance()崩溃

EN

我正在制作一个包含登录系统的，在登录后，我们转到主活动，在那里，您有一个导航抽屉活动。在我开始之前，我的登录系统工作得很好，但是我有一个空的主活动，只有注销按钮。但现在我将我的主要活动更改为导航抽屉活动。在这里我得到了崩溃，当我调试时，我发现崩溃发生在FirebaseAuth.getInstance()上，当我进入代码中时，我发现ActivityThread.java类充满了错误，就像你在照片中看到的那样，我尝试过FirebaseApp.initializeApp(Context)，但它不工作，所以请任何人告诉我为什么它一直崩溃。

下面您可以看到我的build.gradle和我得到的错误

image

apply plugin: 'com.android.application'

android {
compileSdkVersion 29
buildToolsVersion "29.0.2"
defaultConfig {
    applicationId "com.example.greenway"
    minSdkVersion 16
    targetSdkVersion 29
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
    }
}
}

dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'androidx.appcompat:appcompat:1.1.0'
implementation 'com.google.android.material:material:1.0.0'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
implementation 'androidx.navigation:navigation-fragment:2.1.0'
implementation 'androidx.navigation:navigation-ui:2.1.0'
implementation 'androidx.lifecycle:lifecycle-extensions:2.1.0'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test.ext:junit:1.1.1'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
implementation 'com.google.firebase:firebase-core:17.2.1'
implementation 'com.google.firebase:firebase-auth:19.2.0'
implementation 'com.google.firebase:firebase-database:19.2.0'
implementation 'androidx.recyclerview:recyclerview:1.1.0'
implementation 'androidx.cardview:cardview:1.0.0'

}

E/AndroidRuntime:致命异常:主进程: com.example.greenway，PID: 7810 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.greenway/com.example.greenway.Login}：java.lang.IllegalStateException:默认FirebaseApp未在此进程com.example.greenway中初始化。请确保先调用FirebaseApp.initializeApp(Context)。在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3270)在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)在android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)在android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)在android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)在android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)at android.os.Handler.dispatchMessage(Handler.java:107) at android.os.Looper.loop(Looper.java:214) at android.app.ActivityThread.main(ActivityThread.java:7356) at java.lang.reflect.Method.invoke(本机方法) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)原因: java.lang.IllegalStateException:此进程com.example.greenway中的默认FirebaseApp未初始化。请确保先调用FirebaseApp.initializeApp(Context)。at com.google.firebase.FirebaseApp.getInstance(com.google.firebase:firebase-common@@19.3.0:184) at com.google.firebase.auth.FirebaseAuth.getInstance(com.google.firebase:firebase-auth@@19.2.0:1) at com.example.greenway.Login.onCreate(Login.java:41) at android.app.Activity.performCreate(Activity.java:7802) at android.app.Activity.performCreate(活动android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1299) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3245) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83) at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) android.app.servertransaction.TransactionExecutor. at .java:7791)在android.os.Handler.dispatchMessage(Handler.java:107)的android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)中执行(TransactionExecutor.java:95)，在android.os.Looper.loop中执行(Looper.java:214)，在java.lang.reflect.Method.invoke中执行(本机方法)，在com.android.internal.os中执行.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)工作