How to Apply Custom CSS to HTML Content in a WebView?

Rendering HTML with Custom CSS in a WebView

When developing applications that rely on rendering external HTML content, styling the content for optimal user experience becomes crucial. This question explores the options for applying custom CSS styles to HTML content within a WebView, examining both inline style injection and asset-based CSS referencing.

InlineData Injection vs. Asset CSS File

The decision between injecting the CSS into the HTML as it is processed or using an asset CSS file depends on the specific requirements of your app. If the CSS styles are relatively straightforward and will not change frequently, inline injection may be a suitable option, reducing the complexity of managing external assets.

On the other hand, if the CSS is more complex or requires frequent updates, referencing an asset CSS file provides a cleaner separation of concerns and allows for centralized style management.

Referencing Asset CSS Files

To add a CSS file from your app's assets to the HTML content, you can use the WebView.loadDataWithBaseURL method:

htmlData = "<link rel=\"stylesheet\" type=\"text/css\" href=\"style.css\" />";
// assuming "/assets/style.css" file exists
webView.loadDataWithBaseURL("file:///android_asset/", htmlData, "text/html", "UTF-8", null);

By setting the base URL to "file:///android_asset/", the WebView can access files within the app's assets directory.

Additional Note

If the HTML file is loaded from the assets folder, you do not need to specify a base URL. This simplifies the process of applying custom CSS styles to HTML content in your WebView.

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