How to Best Display Custom HTML Content with CSS in an Android WebView?

Displaying Custom HTML Content in a WebView

Question:

An application utilizes JSoup to fetch HTML data from a message board thread. The goal is to render this HTML in a WebView with custom CSS to optimize its appearance for mobile devices. Two approaches are being considered: injecting CSS directly into the HTML data or utilizing a separate CSS file from the app's assets.

Answer:

webview.loadDataWithBaseURL provides a convenient solution by allowing you to specify a base URL and load data with references to local assets. This approach eliminates the need for manual CSS injection and simplifies the process.

Implementation:

1. Concatenate the tag with the custom CSS file path to the HTML data:

htmlData = "<link rel='\"stylesheet\"' type='\"text/css\"' href="%5C%22style.css%5C%22">" + htmlData;

2. Load the HTML data into the WebView, specifying the base URL as the local assets directory and the appropriate MIME type:

webView.loadDataWithBaseURL("file:///android_asset/", htmlData, "text/html", "UTF-8", null);

Note:

If the HTML data is loaded from the assets directory, specifying a base URL is not necessary. This method allows the WebView to resolve relative links to CSS files located within the assets folder.

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