Java.lang.NoClassDefFoundError：解析失败：Lcom / google / firebase / FirebaseApp

Question

这是React Native项目。在Android Studio Emulator中成功构建后出错：

java.lang.NoClassDefFoundError：解析失败：Lcom / google / firebase / FirebaseApp

我的文件：

的package.json：

...
"react-native": "^0.55.3",
"react-native-camera": "1.1.2",
"react-native-check-box": "^2.1.0",
"react-native-extended-stylesheet": "^0.8.1",
"react-native-firebase": "^4.2.0",
"react-native-geocoder": "^0.5.0",
"react-native-git-upgrade": "^0.2.7",
"react-native-htmlview": "^0.12.1",
"react-native-image-picker": "^0.26.10",
"react-native-linear-gradient": "^2.4.0",
"react-native-local-storage": "^1.5.2",
"react-native-maps": "^0.21.0",
"react-native-modal": "^5.4.0",
"react-native-modal-dropdown": "^0.6.1",
"react-native-read-more-text": "^1.0.0",
"react-native-router-flux": "^4.0.0-beta.27",
"react-native-svg-image": "^2.0.1",
"react-native-text-input-mask": "^0.7.0",
...

Android设备/应用/的build.gradle：

...    
android {
    compileSdkVersion 27
    buildToolsVersion "27.0.1"

    defaultConfig {
        applicationId "com.something.anything"
        minSdkVersion 16
        targetSdkVersion 22
        versionCode 1
        versionName "1.0"
        ndk {
            abiFilters "armeabi-v7a", "x86"
        }
        multiDexEnabled true
    }
    signingConfigs {
        release {
            if (project.hasProperty('MYAPP_RELEASE_STORE_FILE')) {
                storeFile file(MYAPP_RELEASE_STORE_FILE)
                storePassword MYAPP_RELEASE_STORE_PASSWORD
                keyAlias MYAPP_RELEASE_KEY_ALIAS
                keyPassword MYAPP_RELEASE_KEY_PASSWORD
            }
        }
    }
    splits {
        abi {
            reset()
            enable enableSeparateBuildPerCPUArchitecture
            universalApk false  // If true, also generate a universal APK
            include "armeabi-v7a", "x86"
        }
    }
    buildTypes {
        release {
            signingConfig signingConfigs.release
            minifyEnabled enableProguardInReleaseBuilds
            proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro"
        }
    }
    // applicationVariants are e.g. debug, release
    applicationVariants.all { variant ->
        variant.outputs.each { output ->
            // For each separate APK per architecture, set a unique version code as described here:
            // http://tools.android.com/tech-docs/new-build-system/user-guide/apk-splits
            def versionCodes = ["armeabi-v7a":1, "x86":2]
            def abi = output.getFilter(OutputFile.ABI)
            if (abi != null) {  // null for the universal-debug, universal-release variants
                output.versionCodeOverride =
                        versionCodes.get(abi) * 1048576 + defaultConfig.versionCode
            }
        }
    }
}

dependencies {
    compile(project(':react-native-firebase')) {
        transitive = false
    }
    compile project(':react-native-geocoder')
    compile(project(':react-native-maps')) {
      exclude group: 'com.google.android.gms', module: 'play-services-base'
      exclude group: 'com.google.android.gms', module: 'play-services-maps'
      exclude group: 'com.google.android.gms', module: 'play-services-location'
    }

    compile 'com.google.android.gms:play-services-base:15.+'
    compile 'com.google.android.gms:play-services-maps:15.+'
    compile 'com.google.android.gms:play-services-location:15.+'
    compile (project(':react-native-camera')) {
    exclude group: "com.google.android.gms"
    compile 'com.android.support:exifinterface:25.+'
    compile ('com.google.android.gms:play-services-vision:12.0.1') {
        force = true
        }
    }
    compile project(':react-native-text-input-mask')
    compile project(':react-native-linear-gradient')
    compile project(':react-native-image-picker')
    compile fileTree(dir: "libs", include: ["*.jar"])
    compile "com.android.support:appcompat-v7:23.0.1"
    compile "com.facebook.react:react-native:+"  // From node_modules
}

allprojects {
    repositories {
        maven { url "https://jitpack.io" }
        maven { url "https://maven.google.com" }
    }
}

// Run this once to be able to run the application with BUCK
// puts all compile dependencies into folder libs for BUCK to use
task copyDownloadableDepsToLibs(type: Copy) {
    from configurations.compile
    into 'libs'
}

安卓/的build.gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {
        jcenter()
        google()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.0'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        mavenLocal()
        jcenter()
        maven {
            // All of React Native (JS, Obj-C sources, Android binaries) is installed from npm
            url "$rootDir/../node_modules/react-native/android"
        }
    }
}

subprojects {
  project.configurations.all {
     resolutionStrategy.eachDependency { details ->
        if (details.requested.group == 'com.android.support'
              && !details.requested.name.contains('multidex')
        ) {
           details.useVersion "27.1.0"
        }
     }
  }
}

我尝试了很多解决方案，但没有任何帮助。

Answer 1

面对同样的问题。然后我发现我错过了一组重要的指令来将Firebase与Android项目集成：https://firebase.google.com/docs/android/setup#add_firebase_to_your_app

以下是对我的案例有帮助的文档中的步骤摘要：

1. 生成google-services.json并将其放入android/app/目录。
2. 将classpath 'com.google.gms:google-services:4.1.0'添加到根级别buildscript -> dependencies配置的build.gradle部分;将google()添加到同一文件的allprogects -> repositories部分。
3. 将implementation 'com.google.firebase:firebase-core:16.0.3'添加到app模块的dependencies文件的build.gradle部分;在同一文件的最底部添加apply plugin: 'com.google.gms.google-services'。
4. 同步和重建。现在它应该工作。