For example: my app got few messages and I need to inform user about this.
Do I need make widget?
I read this How do I add a number to the launcher icon like HTC mail Does?, but it looks like I can’t do this. Only for HTC.
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Launcher icons as managed by the launcher which the default launcher does not have this functionality.
I would recommend to use the notification bar and then secondary a possible widget but it wouldn’t be required.
As a note, a launcher that does have this functionality is ADW but I don’t believe there is an API for it so they would manager which notifications get displayed on which applications.
ADWNotifier: check here