http post - How to access outside HTML form data POSTed through a WebView in Android? -

although there answers on how access html form post data displayed in webview, not able find answer show how access when html form outside or not in our control/server/a local file in assets directory?

what trying here is:

1. open simple form (by passing url webview)
2. get form fields , values after user submits it
3. use in android app