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Html.javaAPI DocAndroid 5.1 API30817Thu Mar 12 22:22:10 GMT 2015android.text

Html

public class Html extends Object
This class processes HTML strings into displayable styled text. Not all HTML tags are supported.

Fields Summary
Constructors Summary
private Html()
Methods Summary
public static java.lang.StringescapeHtml(java.lang.CharSequence text)
Returns an HTML escaped representation of the given plain text.

        StringBuilder out = new StringBuilder();
        withinStyle(out, text, 0, text.length());
        return out.toString();
public static SpannedfromHtml(java.lang.String source)
Returns displayable styled text from the provided HTML string. Any <img> tags in the HTML will display as a generic replacement image which your program can then go through and replace with real images.

This uses TagSoup to handle real HTML, including all of the brokenness found in the wild.

        return fromHtml(source, null, null);
public static SpannedfromHtml(java.lang.String source, android.text.Html$ImageGetter imageGetter, android.text.Html$TagHandler tagHandler)
Returns displayable styled text from the provided HTML string. Any <img> tags in the HTML will use the specified ImageGetter to request a representation of the image (use null if you don't want this) and the specified TagHandler to handle unknown tags (specify null if you don't want this).

This uses TagSoup to handle real HTML, including all of the brokenness found in the wild.

    

                                                                          
          
                                     
        Parser parser = new Parser();
        try {
            parser.setProperty(Parser.schemaProperty, HtmlParser.schema);
        } catch (org.xml.sax.SAXNotRecognizedException e) {
            // Should not happen.
            throw new RuntimeException(e);
        } catch (org.xml.sax.SAXNotSupportedException e) {
            // Should not happen.
            throw new RuntimeException(e);
        }

        HtmlToSpannedConverter converter =
                new HtmlToSpannedConverter(source, imageGetter, tagHandler,
                        parser);
        return converter.convert();
private static java.lang.StringgetOpenParaTagWithDirection(Spanned text, int start, int end)

        final int len = end - start;
        final byte[] levels = ArrayUtils.newUnpaddedByteArray(len);
        final char[] buffer = TextUtils.obtain(len);
        TextUtils.getChars(text, start, end, buffer, 0);

        int paraDir = AndroidBidi.bidi(Layout.DIR_REQUEST_DEFAULT_LTR, buffer, levels, len,
                false /* no info */);
        switch(paraDir) {
            case Layout.DIR_RIGHT_TO_LEFT:
                return "<p dir=\"rtl\">";
            case Layout.DIR_LEFT_TO_RIGHT:
            default:
                return "<p dir=\"ltr\">";
        }
public static java.lang.StringtoHtml(Spanned text)
Returns an HTML representation of the provided Spanned text.

        StringBuilder out = new StringBuilder();
        withinHtml(out, text);
        return out.toString();
private static voidwithinBlockquote(java.lang.StringBuilder out, Spanned text, int start, int end)

        out.append(getOpenParaTagWithDirection(text, start, end));

        int next;
        for (int i = start; i < end; i = next) {
            next = TextUtils.indexOf(text, '\n", i, end);
            if (next < 0) {
                next = end;
            }

            int nl = 0;

            while (next < end && text.charAt(next) == '\n") {
                nl++;
                next++;
            }

            withinParagraph(out, text, i, next - nl, nl, next == end);
        }

        out.append("</p>\n");
private static voidwithinDiv(java.lang.StringBuilder out, Spanned text, int start, int end)

        int next;
        for (int i = start; i < end; i = next) {
            next = text.nextSpanTransition(i, end, QuoteSpan.class);
            QuoteSpan[] quotes = text.getSpans(i, next, QuoteSpan.class);

            for (QuoteSpan quote : quotes) {
                out.append("<blockquote>");
            }

            withinBlockquote(out, text, i, next);

            for (QuoteSpan quote : quotes) {
                out.append("</blockquote>\n");
            }
        }
private static voidwithinHtml(java.lang.StringBuilder out, Spanned text)

        int len = text.length();

        int next;
        for (int i = 0; i < text.length(); i = next) {
            next = text.nextSpanTransition(i, len, ParagraphStyle.class);
            ParagraphStyle[] style = text.getSpans(i, next, ParagraphStyle.class);
            String elements = " ";
            boolean needDiv = false;

            for(int j = 0; j < style.length; j++) {
                if (style[j] instanceof AlignmentSpan) {
                    Layout.Alignment align =
                        ((AlignmentSpan) style[j]).getAlignment();
                    needDiv = true;
                    if (align == Layout.Alignment.ALIGN_CENTER) {
                        elements = "align=\"center\" " + elements;
                    } else if (align == Layout.Alignment.ALIGN_OPPOSITE) {
                        elements = "align=\"right\" " + elements;
                    } else {
                        elements = "align=\"left\" " + elements;
                    }
                }
            }
            if (needDiv) {
                out.append("<div ").append(elements).append(">");
            }

            withinDiv(out, text, i, next);

            if (needDiv) {
                out.append("</div>");
            }
        }
private static voidwithinParagraph(java.lang.StringBuilder out, Spanned text, int start, int end, int nl, boolean last)

        int next;
        for (int i = start; i < end; i = next) {
            next = text.nextSpanTransition(i, end, CharacterStyle.class);
            CharacterStyle[] style = text.getSpans(i, next,
                                                   CharacterStyle.class);

            for (int j = 0; j < style.length; j++) {
                if (style[j] instanceof StyleSpan) {
                    int s = ((StyleSpan) style[j]).getStyle();

                    if ((s & Typeface.BOLD) != 0) {
                        out.append("<b>");
                    }
                    if ((s & Typeface.ITALIC) != 0) {
                        out.append("<i>");
                    }
                }
                if (style[j] instanceof TypefaceSpan) {
                    String s = ((TypefaceSpan) style[j]).getFamily();

                    if (s.equals("monospace")) {
                        out.append("<tt>");
                    }
                }
                if (style[j] instanceof SuperscriptSpan) {
                    out.append("<sup>");
                }
                if (style[j] instanceof SubscriptSpan) {
                    out.append("<sub>");
                }
                if (style[j] instanceof UnderlineSpan) {
                    out.append("<u>");
                }
                if (style[j] instanceof StrikethroughSpan) {
                    out.append("<strike>");
                }
                if (style[j] instanceof URLSpan) {
                    out.append("<a href=\"");
                    out.append(((URLSpan) style[j]).getURL());
                    out.append("\">");
                }
                if (style[j] instanceof ImageSpan) {
                    out.append("<img src=\"");
                    out.append(((ImageSpan) style[j]).getSource());
                    out.append("\">");

                    // Don't output the dummy character underlying the image.
                    i = next;
                }
                if (style[j] instanceof AbsoluteSizeSpan) {
                    out.append("<font size =\"");
                    out.append(((AbsoluteSizeSpan) style[j]).getSize() / 6);
                    out.append("\">");
                }
                if (style[j] instanceof ForegroundColorSpan) {
                    out.append("<font color =\"#");
                    String color = Integer.toHexString(((ForegroundColorSpan)
                            style[j]).getForegroundColor() + 0x01000000);
                    while (color.length() < 6) {
                        color = "0" + color;
                    }
                    out.append(color);
                    out.append("\">");
                }
            }

            withinStyle(out, text, i, next);

            for (int j = style.length - 1; j >= 0; j--) {
                if (style[j] instanceof ForegroundColorSpan) {
                    out.append("</font>");
                }
                if (style[j] instanceof AbsoluteSizeSpan) {
                    out.append("</font>");
                }
                if (style[j] instanceof URLSpan) {
                    out.append("</a>");
                }
                if (style[j] instanceof StrikethroughSpan) {
                    out.append("</strike>");
                }
                if (style[j] instanceof UnderlineSpan) {
                    out.append("</u>");
                }
                if (style[j] instanceof SubscriptSpan) {
                    out.append("</sub>");
                }
                if (style[j] instanceof SuperscriptSpan) {
                    out.append("</sup>");
                }
                if (style[j] instanceof TypefaceSpan) {
                    String s = ((TypefaceSpan) style[j]).getFamily();

                    if (s.equals("monospace")) {
                        out.append("</tt>");
                    }
                }
                if (style[j] instanceof StyleSpan) {
                    int s = ((StyleSpan) style[j]).getStyle();

                    if ((s & Typeface.BOLD) != 0) {
                        out.append("</b>");
                    }
                    if ((s & Typeface.ITALIC) != 0) {
                        out.append("</i>");
                    }
                }
            }
        }

        String p = last ? "" : "</p>\n" + getOpenParaTagWithDirection(text, start, end);

        if (nl == 1) {
            out.append("<br>\n");
        } else if (nl == 2) {
            out.append(p);
        } else {
            for (int i = 2; i < nl; i++) {
                out.append("<br>");
            }
            out.append(p);
        }
private static voidwithinStyle(java.lang.StringBuilder out, java.lang.CharSequence text, int start, int end)

        for (int i = start; i < end; i++) {
            char c = text.charAt(i);

            if (c == '<") {
                out.append("<");
            } else if (c == '>") {
                out.append(">");
            } else if (c == '&") {
                out.append("&");
            } else if (c >= 0xD800 && c <= 0xDFFF) {
                if (c < 0xDC00 && i + 1 < end) {
                    char d = text.charAt(i + 1);
                    if (d >= 0xDC00 && d <= 0xDFFF) {
                        i++;
                        int codepoint = 0x010000 | (int) c - 0xD800 << 10 | (int) d - 0xDC00;
                        out.append("&#").append(codepoint).append(";");
                    }
                }
            } else if (c > 0x7E || c < ' ") {
                out.append("&#").append((int) c).append(";");
            } else if (c == ' ") {
                while (i + 1 < end && text.charAt(i + 1) == ' ") {
                    out.append(" ");
                    i++;
                }

                out.append(' ");
            } else {
                out.append(c);
            }
        }