I have an application that gets the js, html, css settings through WebView, to create an offline map.
In android 4.4 works correctly. No content appears in android 6.0.
I make the call through the assets
webview.loadUrl("file:///android_asset/www/map.html");
I also put the permissions on AndroidManifest.
EDIT1
The problem is occurring along the way to find the images. The permissions were right.
webview.loadUrl("javascript:loadImg('/storage/14F0-C537/www')");
But the address of the used SdCard has to be changed.