java – Android库模块中的Lambda表达式不起作用

我有一个
Android应用程序模块,它使用了jdk 8并启用了Jack Options.然后我将其转换为Android库模块.然后我必须从build gradle中删除Jack Options.现在,当我尝试构建AAR文件时,Lambda表达式给出了以下错误.

Error:(59, 25) error: cannot find symbol method metafactory(Lookup,String,MethodType,MethodType,MethodHandle,MethodType)

给出此错误的代码是,

Runnable r= () -> {
      appManager.startApp(definition,identifier);
};

我的Build Gradle是

Apply plugin: 'com.android.library'

android {
    compileSdkVersion 26
    buildToolsVersion "26.0.0"
    defaultConfig {
        minSdkVersion 18
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"

    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}

compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
}
}

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:26.+'
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    testCompile 'junit:junit:4.12'
}

这个问题的原因是什么?

最佳答案 你忘了应用复古的lambda插件.

将此行添加到build.gradle文件中:

apply plugin: 'me.tatarka.retrolambda'
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