Programming Tutorials

  There are few moments in mobile development more frustrating than successfully compiling a build, only to have the AdMob Mediation Test Suite declare "Adapter Not Found" for a high-value network like Vungle (Liftoff). Even worse is a production crash featuring a   NoClassDefFoundError   pointing to   VungleAdapter   or   com.vungle.warren . These errors directly impact revenue by breaking the mediation waterfall. If AdMob cannot instantiate the Vungle adapter, it skips the network entirely, effectively setting your Vungle eCPM to zero. This guide provides the technical root cause analysis and the specific configuration fixes required to resolve these instantiation errors on Android and iOS. The Root Cause: Reflection vs. Optimization To understand why the adapter vanishes, you must understand how AdMob Mediation works under the hood. The Google Mobile Ads (GMA) SDK does not have a compile-time dependency on the Vungle SDK. Instead, it uses  Java Refl...