Android webview on Unity

All right, it had been bothering me for awhile now

I'm using Android WebView plugin on Unity

But when I open the native webview and try to click sth on the webpage (webview is fullscreen, and Unity UI is covered by web view), I will trigger the UI event on Unity

This happened only on intractable element (e.g. textfield, button, hyperlink...), if I click on empty space on web page, Unity UI won't be trigger

Right now my solution is to disable UI when webview opened, but this thing doesn't happened on iOS, so I wonder if there's a better way.

Thanks in advance !