DayPickerView.java 文件源码

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    final ViewPager viewPager = mViewPager;
    measureChild(viewPager, widthMeasureSpec, heightMeasureSpec);

    final int measuredWidthAndState = viewPager.getMeasuredWidthAndState();
    final int measuredHeightAndState = viewPager.getMeasuredHeightAndState();
    setMeasuredDimension(measuredWidthAndState, measuredHeightAndState);

    final int pagerWidth = viewPager.getMeasuredWidth();
    final int pagerHeight = viewPager.getMeasuredHeight();
    final int buttonWidthSpec = MeasureSpec.makeMeasureSpec(pagerWidth, MeasureSpec.AT_MOST);
    final int buttonHeightSpec = MeasureSpec.makeMeasureSpec(pagerHeight, MeasureSpec.AT_MOST);
    mPrevButton.measure(buttonWidthSpec, buttonHeightSpec);
    mNextButton.measure(buttonWidthSpec, buttonHeightSpec);
}