Android webview sample with permission and upload / download files

https://github.com/googlesamples/android-PermissionRequest

https://www.gauntface.com/blog/2014/10/17/what-you-need-to-know-about-the-webview-in-l

good sample for uploading file from device

https://github.com/googlearchive/chromium-webview-samples/tree/master/input-file-example

sample with download file from webview 

https://androidride.com/android-webview-example-tutorial-kotlin-java-download-source-code/#android%20webview%20download%20file%20example

sample app for PermissionRequest 

from here https://stackoverflow.com/questions/40236925/allowing-microphone-accesspermission-in-webview-android-studio-java

https://github.com/googlesamples/android-PermissionRequest