When you use WebView and pass HTML to it if that HTML code contains “%” – percentage sign you would have “Web Page not Available” error.

% ERROR

let’s see this simple code

String message = "Show Percent: 38% ";
WebView mWebView = (WebView) activity.findViewById(R.id.my_web_view);
mWebView.loadData(message, "text/html", "en_US");

simply the error still exists.
after searching the internet, I found a nice and easy solution.

String message = "Show Percent: 38% ";
message = message.replaceAll("%", "&#37");
WebView mWebView = (WebView) activity.findViewById(R.id.my_web_view);
mWebView.loadData(message, "text/html", "en_US");

the solution is to replace all the % sings in the HTML code with

&#37

(How HTML sees the %).

message = message.replaceAll("%", "&#37");