DynDebloater: Dynamically Debloating Unwanted Features of Android Apps without APK Modification

Modern Android apps are bloated with rarely used features, increasing resource use and security risks. Static debloating methods modify APKs but struggle with anti-tampering and require reinstallations. This paper introduces DynDebloater, the first dynamic Android app debloater, built on a customized OS and management app. It intercepts method calls via a modified ART for DEX methods and removes native method code at runtime, with a graceful termination. A user study shows DynDebloater effectively debloats even tamper-resistant apps, with high stability, satisfaction, and improved user experience. The code and data example are available at https://github.com/zzc1010/DynDebloater, and the demonstration video can be found at https://youtu.be/zEzBMxf1Vf8.