android studio: release apk is not signed

Question

* I have rephrased the post since originally posted *

When I try to run a just-built release apk, I get an error \"the apk for your currently selected v

Answer 1

Set signing config in project structure.

1. File -> Project Structure...
2. Select Modules/app (or other module)
3. Click Signing tab and fill in.
   Key Alias and Key Password comes first. Not same order in "Generate Signed APK" dialog.
4. Click Build Types tab and select release.
   Select "config" in Signing config dropdown list.
5. Click OK to close Project Structure.
6. Run -> Run app

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Run (or Debug) app seems to use apks built with "Buiild -> Build APK". So, we should set signing config if build variants of app module is "release".