ViewPager获取当前显示（焦点）子view

    private View mCurrentView;
    
    @Override
    public void setPrimaryItem(ViewGroup container, int position, Object object) {
        mCurrentView = (View)object;
    }
    
    public View getPrimaryItem() {
        return mCurrentView;
    }

ViewPager的adapter通过setPrimaryItem方法设置当前显示子view.

将其保存下来可作后续应用。