Interview guides / android
ANRs and main thread: Android Interview Question
ANRs and main thread interview question with a clear example answer for Android engineers. Practice with AceMobileInterview.
This is a common Android interview topic: ANRs and main thread.
Below is a concise answer you can adapt in a real interview, then go deeper in the full AceMobileInterview track.
1.What causes ANRs, and how do you diagnose them?
ANRs happen when the main thread is blocked (~5s for input). Avoid disk/network on Main; use coroutines. Diagnose with ANR traces, StrictMode, and Systrace/Perfetto. Mention BroadcastReceiver and Service timeouts too.
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