Lots of Errors in Code but Still App Runs in Android Studio

Today, I opened a very old project for a quick update. After upgrading the support libraries, gradle plugins and other tools, I saw this strange issue for the first time. The app was building and running successfully, but when I opened any code file, I was getting huge list of compile errors mostly about Unresolved Reference etc.

Errors in Android Studio

Initially, I cleaned project, rebuild it, restarted Android studio few times, but couldn’t fix it. Heck, I even resumed my coding by ignoring these silly errors, but due to these strange errors, the autocomplete and other IDE functionalities were not working. So, I had to fix this problem. Then I googled it and found some answers on StackOverflow at here and here.

Most, suggestions were already same what I was doing. What fixed my issue was to delete the .idea and .gradle project from the app directory and Invalidate and Cache Restart the Android Studio and you will be back in the game.

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Wajahat Karim
🌍 Making the world a better place, one app at a time.
🔥 Google Developer Expert (GDE) in Android . 📱 Professional Android Developer with ~10 years experience. 💻 Creator of various Open Source libraries on Android . 📝 Author of two technical books and 100+ articles on Android. 🎤 A passionate Public Speaker giving talks all over the world.
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Wajahat Karim

🔥 Google Dev Expert (GDE) in Android .
📱 Android Dev. 💻 Open Source Contributor . 📝 Technical Writer . 🎤 Public Speaker

Senior Android Developer

Karachi, Pakistan