You might have mapped Android Studio keyboard shortcuts with that of Eclipse IDE that lets you import packages using Ctrl + Shift + O (Command + Shift + O for Mac OS X) but when you are implementing a class with abstract methods the key combinations does not work, for this you have to,

implementing abstract methods
- Place your cursor over the implemented class name and press Alt + Enter ( Option + Enter on macOS)
- You would now see a Red color bulb.
- Click on the bulb and select Implement methods.
- That's it! you would get the abstract methods added with @Override annotations.

Implement methods
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