The problem is:
I have a big Android application. I want to add homescreen widget for this application.
I’ve followed official tutorial and created widget. It works.
Then I’ve include all widget’s code into my big application. Also I’ve declared widget in Android Manifest.
Then app was installed I didn’t see my widget into widget’s list.
WHY IT DIDN’T APPEARED?
The answer is very simple!
My app was installed into SD-card. Moving application to phone was fixed this issue.