左右拖動切換Fragment，Activity中的按鈕不能刷新
如題，按照老師講解的代碼敲了一份，發(fā)現(xiàn)點擊按鈕切換fragment時按鈕文字可以刷新，但是左右拖動切換fragment時，按鈕中的文字不能刷新。
private?void?initView()
{
????mViewPager.setAdapter(new?FragmentPagerAdapter(getSupportFragmentManager())
????{
????????@Override
????????public?Fragment?getItem(int?position)
????????{
????????????return?PieFragment.newInstance(mData.get(position));
????????}
????????@Override
????????public?int?getCount()
????????{
????????????return?mData.size();
????????}
????});
????upDateJumpText();
}
