android radiogroup清空,Android的ClearCheck()对RadioGroup有误吗？

我在使用RadioGroup的clearChecked()时遇到了问题.我正在向用户显示一个多项选择题,在用户选择答案后,我会检查答案,给他一些反馈,然后转到下一个问题.在转到下一个问题的过程中,我清楚检查RadioGroup.

任何人都可以向我解释为什么onCheckedChanged方法被调用3次？一旦实际发生了变化(用户更改),一旦我清除检查(使用-1作为选定的ID)和一次之间(用户再次更改)？

据我所知,第二次触发是由clearCheck引起的.代码如下：

private void checkAnswer(RadioGroup group, int checkedId){

// this makes sure it doesn't blow up when the check is cleared

// also we don't check the answer when there is no answer

if (checkedId == -1) return;

if (group.getCheckedRadioButtonId() == -1) return;

// check if correct answer

if (checkedId == validAnswerId){

score++;

this.giveFeedBack(feedBackType.GOOD);

} else {

this.giveFeedBack(feedBackType.BAD);

}

// allow for user to see feedback and move to next question

h.postDelayed(this, 800);

}

private void changeToQuestion(int questionNumber){