I'm switching over from Eclipse to IntelliJ. In Eclipse, if you do Ctrl+O in the editor, it will show a hover popup that allows you to search for a method in the class you're editing.
What is the equivalent shortcut for that in IntelliJ?
Use Navigate (View in older versions) | File Structure Popup (Ctrl+F12 on Windows, ⌘+F12 on OS X). Start typing method/symbol name to either narrow down the list or highlight the desired element. Press Enter to navigate to the selected element.
I prefer to use the Structure view. To open it, use the menu: View/Tools Window/Structure. The hotkey on Windows is Alt+7
Do Cmd+F12+Fn Key on mac in IntelliJ if clicking Cmd+F12 starts.
If you are running on Linux (I tested in Ubuntu 10.04), the shortcut is Ctrl + F12 (same of Windows)
command+fn+F12 is correct. Lacking of button fn the F12 is used adjust the volume.
On linux distributions (@least on Debian with plasma) the default shortcut is
Ctrl + 0
For Mac Users if command + fn + f12 or command + f12 is not working, then your key map is not selected as "Mac Os X". To select key map follow the below steps.
Android Studio -> Preferences -> Keymap -> From the drop down Select "Mac OS X" -> Click Apply -> OK.
You can type "this." and wait a second, a popup with methods and properties will display.
Not a shortcut, but it works for me.
PS: if you are in a static method, type the class name.
来源：https://stackoverflow.com/questions/3990289/intellij-shortcut-to-show-a-popup-of-methods-in-a-class-that-can-be-searched