Android库模块中的Lambda表达式不起作用 [英] Lambda expression in Android Library Module not working

问题描述

我有一个使用jdk 8并启用了杰克选项的android应用程序模块.然后，将其转换为Android库模块.然后，我必须从构建gradle中删除Jack选项.现在，当我尝试构建AAR文件时，Lambda表达式给了我以下错误.

I had an android app module which used jdk 8 and enabled Jack Options. Then I convert it to an Android Library module. And then I have to remove Jack Options from build gradle. And now the Lambda expression gives me below error when I try to build the AAR file.

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);
};

我的构建平台是

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'
}

此问题的原因是什么?

推荐答案

在我的计算机上，我缺少文件$ANDROID_SDK/build-tools/28.0.3/core-lambda-stubs.jar，因此我不得不使用Android Studio SDK管理器重新安装版本28.0.3的构建工具.

On my machine I was missing the file $ANDROID_SDK/build-tools/28.0.3/core-lambda-stubs.jar, so I had to reinstall version 28.0.3 of the build tools using the Android Studio SDK manager.

(我必须选中显示软件包详细信息"才能查看构建工具版本的完整列表)

(I had to check 'Show package details' to see the full list of build-tools versions)

这篇关于Android库模块中的Lambda表达式不起作用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！