Android Hidden API Compatibility Library

Starting from Android 9 (API level 28), the platform enforces restrictions on non-SDK interface usage. These restrictions apply when apps attempt to access non-SDK interfaces through reflection or JNI.
These measures were implemented to enhance stability by reducing unexpected crashes and minimizing emergency updates for developers.
For more details, see Google's official documentation: Improving Stability by Reducing Usage of non-SDK Interfaces.

try { 
    val clazz = Class.forName("dalvik.system.VMRuntime")
    val method = clazz.getDeclaredMethod("setHiddenApiExemptions", Array<String>::class.java)
    Toast.makeText(context, "API access succeeded: $method", Toast.LENGTH_SHORT).show()
} catch (e: Throwable) {
    Toast.makeText(context, "API access failed: ${e.message}", Toast.LENGTH_SHORT).show()
}

Key Features

• Zero Code Modification - Works with existing codebase without any changes
• Automatic Exemption Handling - Transparently manages hidden API access restrictions
• Lightweight Integration - Single initialization call for seamless operation
• Cross-Version Support - Compatible with Android 9+ (API 28 and higher)

Installation

Add dependency in your app's build.gradle:

dependencies {
    implementation 'io.github.chanjlee:hiddenapi:1.0.0'
}

Usage

Initialize once in your Application class:

class MyApp : Application() {
    override fun onCreate() {
        super.onCreate()
        HiddenApiCompat.compat(this)
    }
}

How It Works

The library implements the following mechanisms:

• Automatic Signature Bypass - Utilizes Android's hidden API exemption protocol
• Reflection Optimization - Smart handling of reflection requirements
• Runtime Safety - Maintains original app behavior while enabling privileged access

Compatibility Matrix

Android Version	API Level	Support Status
Android 9	28	✔️ Full