How to set icon for application?

[madawg]

I am developing a app on Ubuntu14.04

I read http://doc.qt.io/archives/qt-4.8/appicon.html but I still don't know how to set icon for my app.

[ChrisW67]

For most Linux desktops when you install your application:

Put an icon into the appropriate place for the system you are on. This is usually under /usr/share/icons for a system-wide install, ~/.local/share/icons for a single user install, or in the directory of your application.
Put a com.example.yourapp.desktop (https://specifications.freedesktop.org/desktop-entry-spec/latest/) file in /usr/share/applications or ~/.local/share/applications.