使用DexGuard的assumenosideeffects无法移除Android Log问题

我尝试用DexGuard移除Android的Log方法，但生成APK安装到手机后仍能看到日志输出，以下是我的操作配置：

build.gradle(:app) #

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-kapt'
apply plugin: 'dexguard'

android {

    compileSdkVersion rootProject.compileSdkVersion
    buildToolsVersion rootProject.buildToolsVersion

    compileOptions {
        sourceCompatibility = rootProject.javaSourceCompatibility
        targetCompatibility = rootProject.javaTargetCompatibility
    }

    kotlinOptions {
        jvmTarget = "1.8"
    }

    buildFeatures {
        viewBinding = true
        dataBinding = true
        buildConfig = true
    }

    defaultConfig {
        minSdkVersion xx
        targetSdkVersion rootProject.targetSdkVersion
        multiDexEnabled true
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        versionCode VERSION_CODE
        versionName COMMON_VERSION_NAME
    }

    flavorDimensions = ["deploymentType"]

    productFlavors {
        local {
            isDefault = true
            dimension "deploymentType"
        }

        mavenRelease {
            dimension "deploymentType"
        }

        mavenDevelopment {
            dimension "deploymentType"
        }
    }

    buildTypes {

        stagingStable {
            debuggable true
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
            buildConfigField BOOLEAN, IS_DEBUG, TRUE
            buildConfigField BOOLEAN, IS_STAGING_STABLE, TRUE
            matchingFallbacks = ['development', 'release']
        }

    }

    packagingOptions {
        exclude 'META-INF/*.kotlin_module'
    }
}

dependencies {
    implementation "com.squareup.retrofit2:retrofit:$retrofitVersion"
    implementation "com.squareup.retrofit2:converter-gson:$retrofitVersion"
    implementation "com.squareup.okhttp3:logging-interceptor:$okHttpVersion"
}

repositories {
        mavenCentral()
        mavenLocal()
}

dexguard {
    path = '../../dexguard/DexGuard-9.5.5/'
    license = 'dexguard/dexguard-license.txt'

    configurations {
       localStagingStable{
            defaultConfiguration 'dexguard-release.pro'
            configuration 'dexguard/dexguard-release-sdk.txt'
        }
        
    }
}

proguard-rules.pro #

# Add project specific ProGuard rules here.
# By default, the flags in this file are appended to flags specified
# in /home/mateobosco/Android/Sdk/tools/proguard/proguard-android.txt
# You can edit the include path and order by changing the proguardFiles
# directive in build.gradle.
#
# For more details, see
#   http://developer.android.com/guide/developing/tools/proguard.html

# Add any project specific keep options here:

# 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 *;
#}

# Remove Android logging calls (in this case, including errors).
-optimizations code/removal/*

-assumenosideeffects public class android.util.Log

-assumenosideeffects class android.util.Log { *; }

dexguard-release-sdk.txt #

# We'll display some more statistics about the processed code.
-verbose

# Base rules
-include ../../../dexguard/dexguard-rules.pro

# Print a full report
-printconfiguration ../build/fullconfig.pro


# Encrypt the "geopagos" classes
#-encryptclasses com.geopagos.**
#-encryptclasses com.model.geopagos.**
#-encryptclasses com.services.geopagos.**
#-encryptclasses com.utils.geopagos.**

-optimizations code/removal/*

-assumenosideeffects public class android.util.Log

-assumenosideeffects class android.util.Log { *; }

问题根源及修复方案 #

1. 核心问题：minifyEnabled未开启
   你的stagingStable buildType中设置了minifyEnabled false，这会直接禁用DexGuard的代码优化功能——包括-assumenosideeffects规则的执行，只有当minifyEnabled设为true时，DexGuard才会处理这类优化规则。

2. 修正步骤

   • 开启minifyEnabled
     修改stagingStable的配置：

     stagingStable {
         debuggable true
         minifyEnabled true // 必须设为true，否则DexGuard优化不生效
         proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         buildConfigField BOOLEAN, IS_DEBUG, TRUE
         buildConfigField BOOLEAN, IS_STAGING_STABLE, TRUE
         matchingFallbacks = ['development', 'release']
     }
     

   • 优化assumenosideeffects规则
     替换现有模糊的规则，使用精确的方法匹配，确保DexGuard能准确识别并移除Log调用：

     -optimizations code/removal/advanced
     -assumenosideeffects class android.util.Log {
         public static int v(...);
         public static int d(...);
         public static int i(...);
         public static int w(...);
         public static int e(...);
         public static int wtf(...);
     }
     

   • 验证配置生效
     构建APK时查看控制台输出，确认DexGuard被触发（会有专属日志），同时检查生成的fullconfig.pro文件，确保上述规则已被包含。

内容的提问来源于stack exchange，提问作者Nicote Ool