RTEditor/src/main/java/com/onegravity/rteditor/converter/ConverterHtmlToText.java
public static RTPlainText convert(RTHtml<? extends RTImage, ? extends RTAudio, ? extends RTVideo> input) {
        String result = Html.fromHtml(input.getText(), null, new HtmlToTextTagHandler())
                .toString()
                .replace(PREVIEW_OBJECT_CHARACTER, PREVIEW_OBJECT_REPLACEMENT)
                .replace(NBSP_CHARACTER, NBSP_REPLACEMENT);
        return new RTPlainText(result);
    }
public static RTPlainText convert(RTHtml<? extends RTImage, ? extends RTAudio, ? extends RTVideo> input) {
        String result = Html.fromHtml(input.getText(), null, new HtmlToTextTagHandler())
                .toString()
                .replace(PREVIEW_OBJECT_CHARACTER, PREVIEW_OBJECT_REPLACEMENT)
                .replace(NBSP_CHARACTER, NBSP_REPLACEMENT);
        return new RTPlainText(result);
    }
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