I'm having an issue with RadioGroup's clearChecked(). I'm displaying a multiple choice question to the user and after the user selects an answer I check the answer, give him some feedback and then move to the next question. In the process of moving to the next question I clearCheck on the RadioGroup.

Can anyone explain to me why the onCheckedChanged method is called 3 times? Once when the change actually occurs (with the user changes), once when I clearCheck(with -1 as the selected id) and once in between (with the user changes again)?

As far as I could tell the second trigger is provoked by clearCheck. Code below:

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){
    if (questionNumber >= this.questionSet.size()){
        // means we are past the question set
        // we're going to the score activity
        this.goToScoreActivity();
        return;
    }
    //clearing the check
    gr.clearCheck();
    // give change the feedback back to question
    imgFeedback.setImageResource(R.drawable.question_mark); //OTHER CODE HERE
}

and the run method looks like this

public void run() {
        questionNumber++;
        changeToQuestion(questionNumber);
    }