Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community!

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial


Suddenly, android studio "Cannot Resolve Method/symbol".What to do?

After starting the application, suddenly everywhere red text is appearing in my code telling me that android studio cannot resolve several methods and symbols, such as startActivity, ActionBarActivity etc. I have tried cleaning the project and syncing the project with the gradle files. I am a complete noob in Android Studio and am making my first app. What to do?

1 Answer


At first glance it looks like something might have gotten erased in your import statements. Could you try optimizing your imports? This can be done with the shortcut on Windows and Linux of CTRL - ALT - O (the letter O). If this doesn't work, could you post your code so that we can assist you further?