How to create an application for Andoid and iOS at the same time, so that it would save files (audio, video) from the site?

Question

Android

In what direction to look or dig, so that it would be possible to write an application for two platforms at once?
Possible in web languages, possible in Java

Answer 1

react-native is very handy if there are many view components and few non-standard low-level operations, although the list of supported components in RN is wide, for example, there is WebView .