Android NoClassFoundError求助：Codecanyon购得应用启动大量报错

Let’s break down what’s happening here: The error points to a missing kotlin.KotlinPackage class, which was part of older Kotlin runtime versions (pre-1.3) but got removed in newer releases. This almost always stems from a version mismatch between the Kotlin used to compile dependencies (like the AppThemeHelper library in your code) and the Kotlin runtime bundled with your app.

Here are actionable fixes to resolve this issue:

1. Align Kotlin versions across your entire project #

First, ensure every module in your app uses the same stable Kotlin version. Open your project-level build.gradle file and set a unified version:

buildscript {
    ext.kotlin_version = "1.8.22" // Use a recent stable release
    repositories {
        google()
        mavenCentral()
    }
    dependencies {
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

Then update all module-level build.gradle files to reference this shared version instead of hardcoding different ones:

plugins {
    id 'com.android.application'
    id 'kotlin-android'
}

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
}

2. Update the AppThemeHelper dependency #

The ATHUtil class comes from the AppThemeHelper library, which likely uses an outdated Kotlin version. Replace the old dependency with the latest stable release (check for the most current version on Maven Central; 2.0.0 is a reliable recent option):

dependencies {
    // Replace your old AppThemeHelper line with this
    implementation "com.github.skydoves:appthemehelper:2.0.0"
}

This newer version removes all references to the deprecated kotlin.KotlinPackage class.

3. Clean and rebuild your project #

Cached build artifacts often cause version mismatches. Run these steps in Android Studio:

• Go to Build > Clean Project
• Then click Build > Rebuild Project
• If issues persist, go to File > Invalidate Caches... > Invalidate and Restart to clear all cached data.

4. Verify Multidex configuration (if your app uses it) #

If your app has many dependencies and uses Multidex, ensure it’s properly set up:

• In your module-level build.gradle:

  android {
      defaultConfig {
          multiDexEnabled true
      }
  }
  
  dependencies {
      implementation "androidx.multidex:multidex:2.0.1"
  }
  

• Make sure your Application class extends MultiDexApplication, or override attachBaseContext if you can’t change the base class:

  class App : MultiDexApplication() {
      // Your existing app initialization code
  }
  

  Or:

  override fun attachBaseContext(base: Context?) {
      super.attachBaseContext(base)
      MultiDex.install(this)
  }
  

5. Manually rewrite the problematic method (fallback fix) #

If updating dependencies isn’t feasible right now, you can rewrite the resolveColor method to avoid the old Kotlin runtime dependency. Replace your existing ATHUtil object with this version (it splits the method into two instead of using @JvmOverloads, which bypasses the need for kotlin.KotlinPackage):

object ATHUtil {
    fun isWindowBackgroundDark(context: Context): Boolean {
        return !ColorUtil.isColorLight(resolveColor(context, android.R.attr.windowBackground))
    }

    fun resolveColor(context: Context, @AttrRes attr: Int): Int {
        return resolveColor(context, attr, 0)
    }

    fun resolveColor(context: Context, @AttrRes attr: Int, fallback: Int): Int {
        val a = context.theme.obtainStyledAttributes(intArrayOf(attr))
        try {
            return a.getColor(0, fallback)
        } finally {
            a.recycle()
        }
    }
}

内容的提问来源于stack exchange，提问作者Wolves Marshall