Open source libraries attribution in Android apps [closed]
The Apache 2 license does not require attribution in their derived products advertising materials but I in my opinion it is often considered as "a nice thing to do" to support the developers of those libraries.
The attribution requirement "'advertising clause'" was removed in the Apache 1.1 license:
The 1.1 version of the Apache License was approved by the ASF in 2000. The primary change from the 1.0 license is in the 'advertising clause' (section 3 of the 1.0 license); derived products are no longer required to include attribution in their advertising materials, only in their documentation.
Other open source software licenses have different requirements.