• 描述 bug 情况
Process: com.lh.application, PID: 29293
java.lang.IndexOutOfBoundsException: setSpan (-1 ... -1) starts before 0
    at android.text.SpannableStringBuilder.checkRange(SpannableStringBuilder.java:1338)
    at android.text.SpannableStringBuilder.setSpan(SpannableStringBuilder.java:692)
    at android.text.SpannableStringBuilder.setSpan(SpannableStringBuilder.java:684)
    at android.view.accessibility.AccessibilityNodeInfo.setText(AccessibilityNodeInfo.java:2645)
    start == end 崩溃
• 描述触发条件
    1.开启辅助功能 talkback
    2.打开textview带setSpan函数的界面,程序崩溃
SpannableString s = new SpannableString(destStr);
s.setSpan(clickSpan, start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
textview.setText(s); // 核心代码
• 描述 bug 造成的影响（崩溃，ui 异常，触摸失灵或错乱等）
云测500款机型->300+款崩溃
• 描述解决方案（如有）
SpannableString s = new SpannableString(destStr);
s.setSpan(clickSpan, start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
textview.setText(s); // 核心代码
替换成
SpannableStringBuilder spanStr = SpannableStringBuilder.valueOf(destStr);// 
spanStr .setSpan(clickSpan, start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
textview.setText(s);
• 其它
   之前光看java.lang.IndexOutOfBoundsException: setSpan (-1 ... -1) starts before 0
   查看源码下了结论 
   private static String region(int start, int end) {
   return "(" + start + " ... " + end + ")";
   }
   int start = destStr.length() - FOLD_TEXT.length();
   int end = destStr.length();
   String.length()等于-1,这完全不可能,还去问大佬...啧啧啧~
   
   private void checkRange(final String operation, int start, int end) {
   if (end < start) {
       throw new IndexOutOfBoundsException(operation + " " +
               region(start, end) + " has end before start");
    }
   int len = length();
    if (start > len || end > len) {
       throw new IndexOutOfBoundsException(operation + " " +
               region(start, end) + " ends beyond length " + len);
    }
   if (start < 0 || end < 0) {
       throw new IndexOutOfBoundsException(operation + " " +
               region(start, end) + " starts before 0");
    }
  }
  当start == end 也报 setSpan (-1 ... -1) starts before 0,是不是很惊喜~
  事实上,发生崩溃产生在辅助功能开启后,关键错误代码
  at android.view.accessibility.AccessibilityNodeInfo.setText(AccessibilityNodeInfo.java:2645)
  源码如下:
  public void setText(CharSequence text) {
    enforceNotSealed();
    mOriginalText = text;
    // Replace any ClickableSpans in mText with placeholders
    if (text instanceof Spanned) {
        ClickableSpan[] spans =
                ((Spanned) text).getSpans(0, text.length(), ClickableSpan.class);
        if (spans.length > 0) {
            Spannable spannable = new SpannableStringBuilder(text);
            for (int i = 0; i < spans.length; i++) {
                ClickableSpan span = spans[i];
                if ((span instanceof AccessibilityClickableSpan)
                        || (span instanceof AccessibilityURLSpan)) {
                   // We've already done enough
                    break;
                }
               int spanToReplaceStart = spannable.getSpanStart(span);
                int spanToReplaceEnd = spannable.getSpanEnd(span);
                int spanToReplaceFlags = spannable.getSpanFlags(span);
                spannable.removeSpan(span);
                ClickableSpan replacementSpan = (span instanceof URLSpan)
                        ? new AccessibilityURLSpan((URLSpan) span)
                        : new AccessibilityClickableSpan(span.getId());
                spannable.setSpan(replacementSpan, spanToReplaceStart, spanToReplaceEnd,
                        spanToReplaceFlags);
            }
           mText = spannable;
            return;
        }
    }
   mText = (text == null) ? null : text.subSequence(0, text.length());
}
SpannableStringBuilder.java
private IdentityHashMap<Object, Integer> mIndexOfSpan;
public int getSpanStart(Object what) {
   if (mIndexOfSpan == null) return -1;
    Integer i = mIndexOfSpan.get(what);
    return i == null ? -1 : resolveGap(mSpanStarts[i]);
}
mIndexOfSpan = null 返回-1
int spanToReplaceStart = spannable.getSpanStart(span);//返回-1
int spanToReplaceEnd = spannable.getSpanEnd(span);//返回-1
所以 x.setSpan(clickSpan, start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);// 崩溃恒成立
根据源码来看 mIndexOfSpan 不能为空即可解决问题
SpannableString s = new SpannableString(destStr);
s.setSpan(clickSpan, start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
textview.setText(s); // 核心代码
替换成
SpannableStringBuilder spanStr = SpannableStringBuilder.valueOf(destStr);// 
spanStr .setSpan(clickSpan, start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
textview.setText(spanStr ); 
我有理由怀疑这是系统bug,我正常调用api,你开个辅助就把我废了~