How Android Studio Prompts for function usage

Eclipse has a very good function, that is, when your code calls an Android API, the mouse moves to the corresponding function or method, it will automatically have a hanging

The floating window prompts the description of the function (which contains the parameter meaning, the method function). After migrating to Android studio, this mouse moves to the function and you find

Suspended windows do not come out, all kinds of not used to AH. So how does Android studio look at the description of the function? Check the functions you want to see, such as I want to check

Look at the bottom function to use the instructions, first select, and then press F2, quack, suspended window out, really is not convenient ah, the beginning of use when very not accustomed to, feel the eggs are broken.

This.showasdropdown (View anchor, int xoff, int yoff).

If you want to change the shortcut to a mouse click , is also possible, concrete procedure, please poke this: android studio modifies shortcut keys