I'm developing a Kotlin Android app that features a terminal interface using a web view to render Terminal.html. The HTML file loads two scripts, XTerm.js and xterm-fit-addon.js, along with XTerm.css. Initially, everything worked fine in both the web view and desktop browsers. However, after incorporating the fit addon script, the terminal now only displays correctly on desktop, not within the app's web view. I sought help from several sources, including AI assistance, but found no solid solutions. The closest clue I discovered was about rendering occurring before the view's height is set, which doesn't seem to apply to my web view situation. I've even tried adding a timeout to delay rendering, but that hasn't worked either.
2 Answers
Make sure to call the fit() function only after the WebView has fully laid out and has a non-zero size.
I totally get your struggle! WebView rendering issues are notoriously tricky because you can't just use devtools like you normally would. I dealt with a similar problem where a JavaScript library worked great in desktop browsers but failed in mobile web views. It turned out that the web view was using an outdated JavaScript engine that didn't support some features. The fit addon could be trying to access APIs or measure dimensions that Android's WebView doesn't handle the same way Chrome does. A couple of things that helped me were bridging console logs from the web view to Android logcat to see if the fit addon was initializing, and also checking for any silent errors. Sometimes explicitly defining the width and height for the container can make a difference instead of letting the fit addon handle it. WebView debugging can seriously make you reconsider your career choices! Good luck!

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