Android Studio: Javadoc is empty on hover

Turns out the docs hover page was simply resized to be very short. Carefully moving the mouse down to the bottom of the hover page allowed me to resize it.

Even after resizing it though, I still see it return to it's tiny size quite often... I'm glad I have my docs back, even if it does mean dealing with this annoyance.

You don't need to edit the idea.properties file, just go to File -> Settings -> Editor -> General, then check "Show quick doc on mouse move" in the right pane.

Did U downloaded Documentation for Android SDK from Android SDK Manager?

If you installed the Documentation you will get like this when you press Ctrl + Shift + Space

Android Studio 1.2.2

File > Settings > Editor > General > Show quick doc on mouse move.

Android Studio 1.0

File > Settings > IDE Settings Editor > Show quick doc on mouse move.