webview.loadUrl("file:///android_asset/index.html");
webview.loadUrl("file:"+getFilesDir()+File.separator+"index.html");
webview.loadUrl("file:"+getCacheDir()+File.separator+"index.html");
webview.loadUrl("file:"+Environment.getExternalStorageDirectory()+File.separator+"index.html");
webview.loadUrl("file:"+Context.getExternalFilesDir()+File.separator+"index.html");
webview.loadUrl("file:"+Context.getExternalCacheDir()+File.separator+"index.html");
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