import com.facebook.react.views.text.ReactTagSpan; //导入依赖的package包/类
/**
 * Remove and/or add {@link Spanned.SPAN_EXCLUSIVE_EXCLUSIVE} spans, since they should only exist
 * as long as the text they cover is the same. All other spans will remain the same, since they
 * will adapt to the new text, hence why {@link SpannableStringBuilder#replace} never removes
 * them.
 */
private void manageSpans(SpannableStringBuilder spannableStringBuilder) {
  Object[] spans = getText().getSpans(0, length(), Object.class);
  for (int spanIdx = 0; spanIdx < spans.length; spanIdx++) {
    // Remove all styling spans we might have previously set
    if (ForegroundColorSpan.class.isInstance(spans[spanIdx]) ||
        BackgroundColorSpan.class.isInstance(spans[spanIdx]) ||
        AbsoluteSizeSpan.class.isInstance(spans[spanIdx]) ||
        CustomStyleSpan.class.isInstance(spans[spanIdx]) ||
        ReactTagSpan.class.isInstance(spans[spanIdx])) {
      getText().removeSpan(spans[spanIdx]);
    }

    if ((getText().getSpanFlags(spans[spanIdx]) & Spanned.SPAN_EXCLUSIVE_EXCLUSIVE) !=
        Spanned.SPAN_EXCLUSIVE_EXCLUSIVE) {
      continue;
    }
    Object span = spans[spanIdx];
    final int spanStart = getText().getSpanStart(spans[spanIdx]);
    final int spanEnd = getText().getSpanEnd(spans[spanIdx]);
    final int spanFlags = getText().getSpanFlags(spans[spanIdx]);

    // Make sure the span is removed from existing text, otherwise the spans we set will be
    // ignored or it will cover text that has changed.
    getText().removeSpan(spans[spanIdx]);
    if (sameTextForSpan(getText(), spannableStringBuilder, spanStart, spanEnd)) {
      spannableStringBuilder.setSpan(span, spanStart, spanEnd, spanFlags);
    }
  }
}