问为什么ClickableSpan的onClick()方法在安卓中会被调用两次

EN

String mTitleBody = Html.fromHtml(postBodyText).toString().substring(0, 150).trim();

mTitleBody = mTitleBody.concat("..." + mContext.getResources().getString(R.string.readMore)).replaceAll("<img.+?>|<IMG.+?>", "").replaceAll("\n", "<br/>");
int index1 = Html.fromHtml(mTitleBody).toString().trim().length() -
        mContext.getResources().getString(R.string.readMore).length();
int index2 = Html.fromHtml(mTitleBody).toString().trim().length();

postTextView.setTextIsSelectable(true);
postTextView.setMovementMethod(LinkMovementMethod.getInstance());
postTextView.setText(Html.fromHtml(mTitleBody), TextView.BufferType.SPANNABLE);
Spannable mySpannable = (Spannable) postTextView.getText();
ClickableSpan myClickableSpan = new ClickableSpan() {
    @Override
    public void onClick(View view) {
      Log.d("FirstClass", "onClick");

      Intent intent = new Intent(mContext, SecondActivity.class);
      (mContext).startActivity(intent);
      ((Activity) mContext).overridePendingTransition(R.anim.slide_in_right, R.anim.slide_out_left);

    }

    @Override
    public void updateDrawState(TextPaint ds) {
      super.updateDrawState(ds);
      ds.setUnderlineText(false);
      ds.setColor(ContextCompat.getColor(mContext, R.color.body_text_3));
    }
};
mySpannable.setSpan(myClickableSpan, index1, index2, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);