有空可以考虑如下功能 about android-rich-text-editor HOT 10 CLOSED

        if (c == '<') {
            out.append("&lt;");
        } else if (c == '>') {
            out.append("&gt;");
        } else if (c == '&') {
            out.append("&amp;");
        } 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("&nbsp;");
                i++;
            }

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

} else if (c > 0x7E || c < ' ') {
    // out.append("&#").append((int) c).append(";");
    out.append(c);
}