ViewTreeObserver.OnGlobalLayoutListener回调两次，并且传递的延展值不等于

Question

当我编写一个自定义视图时，向其添加ViewTreeObserver.onGlobalLayoutListener，但是，我两次调用了监听器，并且方法的值更改了

public  void setClassStatus(final ClassStatus s) {
    Log.d("lijiwei321", "setClassStatus execute,input s:"+s);
          setClassStatusFlag = true;
            QualificationsSeekBarView.this.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
                @Override
                public void onGlobalLayout() {
                    Log.d("lijiwei321", "currentThread:"+Thread.currentThread().getName()+"callback s:"+s);
                    if (setClassStatusFlag) {
                        int availableWidth = getMeasuredWidth() - getPaddingRight() - getPaddingLeft();
                        Log.d("availableWidth", "availableWidth:" + availableWidth);
                        if (s == ClassStatus.Eager) {
                            currentX = Math.round((shortLineLength - (radius1 - radius0)) / sumLength * availableWidth);
                        } else if (s == ClassStatus.Refine) {
                            currentX = Math.round((shortLineLength + radius0 + radius0 + commonLineLength - (radius1 - radius0)) / sumLength * availableWidth);
                        } else if (s == ClassStatus.TravelFar) {
                            currentX = Math.round((shortLineLength + radius0 + radius0 + commonLineLength
                                    + radius0 + radius0 + commonLineLength - (radius1 - radius0)) / sumLength * availableWidth);
                        } else {
                            currentX = Math.round((shortLineLength + radius0 + radius0 + commonLineLength
                                    + radius0 + radius0 + commonLineLength + radius0 + commonLineLength + radius0 - (radius1 - radius0)) / sumLength * availableWidth);
                        }
                        invalidate();
                        setClassStatusFlag = false;
                    }
                }
            });
}

日志： enter image description here