What tools does Android use to complicate and protect application source code?

To complicate and protect the source code of Android applications, obfuscation and encryption are usually used. The main tool is ProGuard, which removes unused code, shortens class and method names, making the code less readable. More advanced tools include R8 (which replaces ProGuard in newer versions of the Android Gradle Plugin) and third-party obfuscators like DexGuard.

Obfuscation makes reverse engineering and code analysis more difficult, reducing the risk of intellectual property theft and hacking. String and resource encryption can also be used to protect confidential data.

An example of enabling ProGuard in build.gradle:

android {
    buildTypes {
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}