“无法解决：com.google.firebase:firebase-core:9.0.0”

Question

我想在我的 android 应用程序中使用 fire base 进行身份验证

1. 我创建了应用程序，然后下载了 JSON 文件并将其粘贴到应用程序文件夹中

2. 我将此添加到我的 build.gradle > 项目中

    // Top-level build file where you can add configuration options common to all sub-projects/modules.
   
   buildscript {
       repositories {
           jcenter()
       }
       dependencies {
           classpath 'com.android.tools.build:gradle:2.2.1'
           classpath 'com.google.gms:google-services:3.0.0'
           // NOTE: Do not place your application dependencies here; they belong
           // in the individual module build.gradle files
       }
   }
   
   allprojects {
       repositories {
           jcenter()
       }
   }
   
   task clean(type: Delete) {
       delete rootProject.buildDir
   }
   

3. 将此应用添加到我的 build.gradle > 应用程序

   apply plugin: 'com.android.application'
   android {
       compileSdkVersion 24
       buildToolsVersion "23.0.1"
       defaultConfig {
           applicationId "com.example.mahmoud.loginwithfirebase"
           minSdkVersion 15
           targetSdkVersion 24
           versionCode 1
           versionName "1.0"
           testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
       }
       buildTypes {
           release {
               minifyEnabled false
               proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
           }
       }
   }
   
   dependencies {
   
       compile fileTree(dir: 'libs', include: ['*.jar'])
       androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
           exclude group: 'com.android.support', module: 'support-annotations'
       })
       compile 'com.android.support:appcompat-v7:24.2.1'
       testCompile 'junit:junit:4.12'
   }
   apply plugin: 'com.google.gms.google-services'
   

   但是出现了这个错误

4. 这个 MainActivity.java

   package com.example.mahmoud.loginwithfirebase;
   
   import android.support.v7.app.AppCompatActivity;
   import android.os.Bundle;
   
       public class MainActivity extends AppCompatActivity {
   
           @Override
           protected void onCreate(Bundle savedInstanceState) {
               super.onCreate(savedInstanceState);
               setContentView(R.layout.activity_main);
           }
       }
   

Answer 1

将此行 com.google.firebase:firebase-auth:9.6.1' 添加到您的 build.gradle 依赖项中，如下所示：https://firebase.google.com/docs/android/setup 但不是核心使用身份验证。