What do setUseWideViewPort() and setLoadWithOverviewMode() precisely do?
Apparently:
setLoadWithOverviewMode(true) loads the WebView completely zoomed out
setUseWideViewPort(true) makes the Webview have a normal viewport (such as a normal desktop browser), while when false the webview will have a viewport constrained to its own dimensions (so if the webview is 50px*50px the viewport will be the same size)
If the setUseWideViewPort(true), it loads the WebView with the attributes defined in the meta tag of the webpage. So it scales the webpage as defined in the html.