添加Java 8支持时Android Gradle构建失败

Question

在我的 Android 项目中，我使用gradle 3.1，添加了minifyEnabled true并配置了 proguard-rules ，并且在我使用{{1 }}项目构建没有错误。但是后来我将Java 1.8支持添加到gradle中，然后该项目开始构建失败。同样，一旦我通过删除./gradlew clean build和sourceCompatibility JavaVersion.VERSION_1_8删除了Java 8支持，则该项目将使用targetCompatibility JavaVersion.VERSION_1_8进行构建。我该如何解决这个问题。

我的 build.gradle 文件如下

./gradlew clean build

我的保护规则如下

apply plugin: 'com.android.application'

apply plugin: 'kotlin-android'

apply plugin: 'kotlin-android-extensions'

buildscript {
    repositories {
        mavenCentral()
    }
}

repositories {
    mavenCentral()
}

android {
    compileSdkVersion 28

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    defaultConfig {
        applicationId "com.rxtest.proguard"
        minSdkVersion 21
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        multiDexEnabled = true
    }
    buildTypes {
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    //Looks great
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    // Unit testing
    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'
    // Kotlin
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
    // Google
    implementation "com.android.support:appcompat-v7:$android_support_version"
    implementation "com.android.support:design:$android_support_version"
    // Constraint layout
    implementation 'com.android.support.constraint:constraint-layout:1.1.2'
    // Tapadoo Alerter
    implementation 'com.tapadoo.android:alerter:2.0.6'
    // Networking
    implementation 'com.squareup.retrofit2:converter-moshi:2.3.0'
    implementation 'com.squareup.okhttp3:logging-interceptor:3.10.0'
    implementation 'com.facebook.stetho:stetho:1.5.0'
    implementation 'com.facebook.stetho:stetho-okhttp3:1.5.0'
    implementation "com.squareup.retrofit2:adapter-rxjava2:2.3.0"
    //RxJava
    implementation "io.reactivex.rxjava2:rxandroid:2.0.2"
    //Android Architectural components
    implementation "android.arch.lifecycle:extensions:1.1.1"
    implementation "android.arch.lifecycle:viewmodel:1.1.1"
    //HockeyApp
    implementation 'net.hockeyapp.android:HockeySDK:5.1.0'
}

当我构建项目时，如下所示从终端接收到堆栈跟踪。

# Add project specific ProGuard rules here.
# You can control the set of applied configuration files using the
# proguardFiles setting in build.gradle.
#
# For more details, see
#   http://developer.android.com/guide/developing/tools/proguard.html

# If your project uses WebView with JS, uncomment the following
# and specify the fully qualified class name to the JavaScript interface
# class:
#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
#   public *;
#}

# Uncomment this to preserve the line number information for
# debugging stack traces.
#-keepattributes SourceFile,LineNumberTable

# If you keep the line number information, uncomment this to
# hide the original source file name.
#-renamesourcefileattribute SourceFile

-dontwarn java.lang.invoke.*

# Google
-keep class android.support.v7.widget.** { *; }
-keep interface android.support.v7.widget.** { *; }
-keep class android.support.v4.app.** { *; }
-keep interface android.support.v4.app.** { *; }

# Platform calls Class.forName on types which do not exist on Android to determine platform.
-dontnote retrofit2.Platform
# Platform used when running on Java 8 VMs. Will not be used at runtime.
-dontwarn retrofit2.Platform$Java8
# Retain generic type information for use by reflection by converters and adapters.
-keepattributes Signature
# Retain declared checked exceptions for use by a Proxy instance.
-keepattributes Exceptions


-keep class com.rxtest.proguard.network.** { *; }

# OkHttp
-dontwarn org.codehaus.**
-dontwarn okhttp3.**
-dontwarn okio.**

#Retrofit
-dontwarn retrofit.**
-keep class retrofit.** { *; }
-keepattributes Signature
-keepattributes Exceptions
-keepattributes *Annotation*
-keep class com.facebook.** {
   *;
}

-keepclasseswithmembers class * {
    @retrofit2.http.* <methods>;
}

#Stetho
-keep class com.facebook.stetho.** {
  *;
}

任何解决此问题的线索都将受到热烈欢迎：）。