Use Android's "Share" feature to copy! You can paste it anywhere you want.

No window (Activity) pops up or blinks while copying.
This version currently supports only copying text data.

This is an open source project using Scala.
The source can be found in http://bitbucket.org/Naetmul/copy-to-clipboard

Privacy policy: https://naetmul.bitbucket.io/copy-to-clipboard/privacy-policy.html