<ul><li>Overdraw in Android apps occurs when a pixel on the screen is drawn multiple times, resulting in performance issues.</li><li>To diagnose overdraw, developers can use the debug GPU overdraw feature in the developer options on Android.</li><li>ANR (Application Not Responding) occurs when an app in the foreground becomes unresponsive, leading to user frustration.</li><li>Preventing ANR involves keeping the main/UI thread unblocked and ensuring responses to user input within a certain timeframe.</li></ul>

Overdraw, Memory Leaks, ANR and Slow Rendering in Android Apps

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