Eliminating ANRs at Scale: A Hands-On Guide to Android Responsiveness

What We Will Build By the end of this workshop, you will have three concrete systems in your Android project that prevent ANRs before they ever reach production: A structured concurrency pattern that guarantees no blocking work on the main thread A main-thread budget tracker that flags jank and pre-ANR conditions during development A StrictMode CI gate that fails your build when someone introduces a blocking call I have shipped this exact setup across apps serving millions of users. It took our ANR rate from 0.47% down to 0.02%. Let me show you how. Prerequisites An Android project using Kotlin and Jetpack ViewModel Familiarity with Kotlin coroutines ( launch , async , suspend ) A CI pipeline (GitHub Actions, GitLab CI, or similar) Step 1: Enforce Structured Concurrency in Your ViewModels Here is the gotcha that will save you hours: coroutines are not just a replacement for AsyncTask . The real win is structured concurrency — tying coroutine lifetimes to your component lifetimes so you