[android] Application Error - The connection to the server was unsuccessful. (file:///android_asset/www/index.html)

I had the same on my project.

I tried " super.setIntegerProperty("loadUrlTimeoutValue", 70000); " but to no avail.

I ensured all files were linked properly [ CSS, JS files etc ], validated the HTML using w3c validator [ http://validator.w3.org/#validate_by_upload ] , and cleaned the project [ Project -> Clean ]

It now loads and executes without the same error.

Hope this helps