如何解析API返回的转义HTML并在TextView中正确显示无序列表

Alright, let's break down why your TextView isn't rendering the unordered list correctly and fix it step by step:

First, Fix the Double-Escaped HTML String #

Your raw API response is double-escaped — for example, <ul> is actually the result of escaping <ul> twice. Before rendering, you need to decode it back to proper HTML:

// Your original escaped string from the API
String rawEscapedHtml = "<ul><li>Without Flavor & Size</li>...";

// Option 1: Use Android's HtmlCompat to decode twice
String decodedOnce = HtmlCompat.fromHtml(rawEscapedHtml, HtmlCompat.FROM_HTML_MODE_COMPACT).toString();
String realHtml = HtmlCompat.fromHtml(decodedOnce, HtmlCompat.FROM_HTML_MODE_COMPACT).toString();

// Option 2: Use Apache Commons Lang's StringEscapeUtils (simpler)
String realHtml = StringEscapeUtils.unescapeHtml4(StringEscapeUtils.unescapeHtml4(rawEscapedHtml));

Fix List Rendering (Native Android Solution) #

Android's native Html.fromHtml ignores <ul> and <li> styling — it just dumps the text without bullets or indentation. To fix this, create a custom TagHandler to handle list tags:

public class ListTagHandler implements TagHandler {
    private int indentation = 0;
    private static final int INDENT_PX = 32; // Adjust this for your desired indent size

    @Override
    public void handleTag(boolean opening, String tag, Editable output, XMLReader xmlReader) {
        switch (tag.toLowerCase()) {
            case "ul":
            case "ol":
                // Adjust indentation when entering/exiting a list
                indentation += opening ? INDENT_PX : -INDENT_PX;
                break;
            case "li":
                if (opening) {
                    // Add bullet point
                    output.append("• ");
                    // Apply indentation to the bullet and list item text
                    output.setSpan(
                        new LeadingMarginSpan.Standard(indentation),
                        output.length() - 2,
                        output.length(),
                        Spanned.SPAN_MARK_MARK
                    );
                } else {
                    // Add a line break after each list item
                    output.append("\n");
                }
                break;
        }
    }
}

Then use this handler to parse and display the HTML:

Spanned styledContent = HtmlCompat.fromHtml(
    realHtml,
    HtmlCompat.FROM_HTML_MODE_COMPACT,
    null,
    new ListTagHandler()
);
yourTextView.setText(styledContent);

Alternative: Use a Third-Party Library (Markwon) #

If you tried third-party libraries before and they didn't work, you probably skipped decoding the double-escaped string first. Markwon handles HTML lists flawlessly:

1. Add the dependency to your build.gradle:

implementation "io.noties.markwon:core:4.6.2"

2. Decode your string and render it:

String realHtml = StringEscapeUtils.unescapeHtml4(StringEscapeUtils.unescapeHtml4(rawEscapedHtml));
Markwon markwon = Markwon.create(context);
markwon.setMarkdown(yourTextView, realHtml);

Why Your Previous Attempts Failed #

• You didn't decode the double-escaped string, so the parser was seeing <ul> instead of actual <ul> tags.
• Android's native HTML parser doesn't support list styling out of the box — it requires custom handling or a dedicated library.

内容的提问来源于stack exchange，提问作者Ali Habbash