webView.loadUrl("file:///android_asset/filename.html");
This may help you…give your html filename in the place of “filename” in this url. And try serching in google when you face some problem. Simple que like this is not so appreciated here. And you will get many que like this once you search in SO. try this three links
link 1 ,link 2 , link 3
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solved loading html file is showing error webpage is not available [closed]