viewpager fragemnt空白问题记录

最终解释为fragment在系统回收还原不完整导致的，最终解决办法是

@Override
protected void onSaveInstanceState(Bundle outState) {
    if(mViewPager != null){
        outState.putInt(STATE_POSITION, mViewPager.getCurrentItem());
    }
 //   super.onSaveInstanceState(outState);
}