为了减小应用的大小，我们在android/app/build.gradle中进行了以下更改：

def enableSeparateBuildPerCPUArchitecture = false => true
def enableProguardInReleaseBuilds = false => true

但是当尝试生成签名的apk时，我们遇到了这个错误：

* What went wrong:

执行任务“：app：packageRelease”失败。
执行com.android.build.gradle.internal.tasks.Workers$动作外观java.io时发生错误。IOException：无法创建路径-项目/android/应用程序/构建/输出/apk/版本/app1.0.5（65）-版本.apk'
我们尝试添加

org.gradle.jvmargs=-Xmx4608m

到gradle.properties，但它不起作用。
我们在android/build.gradle中有以下内容

buildscript {
ext {
    buildToolsVersion = "30.0.2"
    minSdkVersion = 21
    compileSdkVersion = 30
    targetSdkVersion = 30
    firebaseMessagingVersion = "+"
    googlePlayServicesVersion = "+"
    playServicesVersion = "17.0.0"
    androidMapsUtilsVersion = "2.2.5"
}
repositories {
    google()
    jcenter()
}
dependencies {
    classpath("com.android.tools.build:gradle:4.0.1")
    classpath 'com.google.gms:google-services:4.3.8'
}

}
以及以下内容在android/app/build.gradle中

esplits {
        abi {
            reset()
            enable enableSeparateBuildPerCPUArchitecture
            universalApk false  // If true, also generate a universal APK
            include "armeabi-v7a", "x86", "arm64-v8a", "x86_64"
        }
    }

buildTypes {
        debug {
            signingConfig signingConfigs.debug
        }
        release {
            signingConfig signingConfigs.debug
            minifyEnabled enableProguardInReleaseBuilds
            proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro"
        }
        applicationVariants.all { variant ->
            variant.outputs.all {
                outputFileName = "tcard${variant.versionName}(${variant.versionCode})-${variant.name}.apk"
            }
        }
    }

applicationVariants.all { variant ->
        variant.outputs.each { output ->
            // For each separate APK per architecture, set a unique version code as described here:
            // https://developer.android.com/studio/build/configure-apk-splits.html
            def versionCodes = ["armeabi-v7a": 1, "x86": 2, "arm64-v8a": 3, "x86_64": 4]
            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
            }

        }

packagingOptions {
        pickFirst 'lib/x86/libc++_shared.so'
        pickFirst 'lib/x86_64/libjsc.so'
        pickFirst 'lib/arm64-v8a/libjsc.so'
        pickFirst 'lib/arm64-v8a/libc++_shared.so'
        pickFirst 'lib/x86_64/libc++_shared.so'
        pickFirst 'lib/armeabi-v7a/libc++_shared.so'
    }