Android构建报错：Invoke-customs仅支持min-api 26 求解决方案

Hey there, let's work through this error you're encountering step by step. First, let's unpack why this is happening:

The error message points to Java 8+ language features (like invoke-custom bytecode) being used in your project, but your app's minSdkVersion is lower than 26. By default, these advanced Java features require a minimum API level of 26 to run on Android. On top of that, you mentioned changing sourceCompatibility and targetCompatibility to kotlin_version—that's a misstep, since those settings are meant for specifying Java versions, not Kotlin versions.

Here's how to fix this:

1. Correct your compileOptions configuration #

First, revert the compileOptions back to a valid Java version (Java 8 is the standard for modern Android development, and it plays nicely with Kotlin). You'll also need to set the Kotlin JVM target version separately:

android {
    compileOptions {
        // Set these back to a valid Java version
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    // Add or update this for Kotlin compatibility
    kotlinOptions {
        jvmTarget = "1.8"
    }
}

2. Enable Desugaring if you need to support minSdk < 26 #

If your app needs to run on devices with API level lower than 26, you'll need to enable core library desugaring to make Java 8 features work on older Android versions. Add these changes to your app-level build.gradle:

android {
    compileOptions {
        coreLibraryDesugaringEnabled true // Enable desugaring
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    kotlinOptions {
        jvmTarget = "1.8"
    }
}

dependencies {
    // Add the desugaring library
    coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:1.2.2'
}

3. Verify Gradle and build tool compatibility #

Since you're using Android Studio 4.2.2, make sure your Gradle setup is compatible:

• Your Gradle plugin version (in project-level build.gradle) should be 4.2.2
• The Gradle wrapper version (in gradle/wrapper/gradle-wrapper.properties) should be around 6.7.1 (this matches the 4.2.2 plugin)
• buildToolsVersion "27.0.3" is compatible with this setup, but you can also use a newer build tool version if needed (like 30.0.3, which works well with AS 4.2.2)

Quick note on Kotlin version setup #

Remember, your kotlin_version should be defined in your project-level build.gradle, like this:

buildscript {
    ext.kotlin_version = "1.5.31" // Recommended version for AS 4.2.2
    repositories {
        google()
        mavenCentral()
    }
    dependencies {
        classpath "com.android.tools.build:gradle:4.2.2"
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

This is where you manage your Kotlin version, not in the compileOptions block.

That should resolve the invoke-customs error. Let me know if you hit any snags with these steps!

内容的提问来源于stack exchange，提问作者Rona Idea