按下后退按钮时，用户界面变得混乱

Question

我有调用一些片段的FragmentActivity (MainFragmentActivity)。我会说下面的是第三个片段。

BaseFragment fragSensors = SensorsPagerFragment.newInstance(
                            m_objAppCredentials);
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();

if (bFirst)
    ft.add(R.id.flControlContainer, fragSensors, strTag);
else
    ft.replace(R.id.flControlContainer, fragSensors, strTag);

在下面的课上有一张视图纸，在滑动时调用更多的碎片。在其中一个片段中，一个活动被称为。当从活动中按下后退按钮时。出现第一个片段UI，它与viewpager中的一个片段的UI混合在一起。

如何销毁视图中片段的UI或避免UI混淆？

public class SensorsPagerFragment extends BaseFragment {
    ViewPager m_oVP;

    public SensorsPagerFragment() {
        LogUtils.LOGD("DEBUG", "SensorsPagerFragment::CTOR");
    }

    public static SensorsPagerFragment newInstance(AppCredentials objAppCredentials) {
        SensorsPagerFragment frag = new SensorsPagerFragment();
        m_objAppCredentials = objAppCredentials;
        return frag;
    }

    @Override
    public View onCreateView(LayoutInflater inflater,
                             ViewGroup container,
                             Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fragment_sensors_pager, container, false);

        m_oVP = (ViewPager) v.findViewById(R.id.vpSensors);
        //pager.setOffscreenPageLimit(0);
        // Attach the adaptor to the PAGER
        m_oVP.setAdapter(buildAdapter());

        return v;
    }

    private PagerAdapter buildAdapter() {
        return (new SensorFragmentPA(getChildFragmentManager()));
    }

    @Override
    public void onStop() {
        super.onStop();
        CustomToast.Warning(getActivity().getApplicationContext(),
                "SensorsPagerFragment::onStop()", 1);
    }

    ////////////////////////////////////////////////////////////////////////////////////////////////
    // class SensorFragmentPA
    class SensorFragmentPA extends FragmentPagerAdapter {

        public SensorFragmentPA(FragmentManager fm) {
            super(fm);
        }

        @Override
        public int getCount() {
            return Constants.cTOTAL_PAGES;
        }

        @Override
        public Fragment getItem(int nPageNum) {
            SensorsFragment f = SensorsFragment.newInstance(m_objAppCredentials, nPageNum);
            return f;
        }

        @Override
        public String getPageTitle(int nPageNum) {
            return Integer.toString(nPageNum + 1);
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            super.destroyItem(container, position, object);
        }
    }
}

Answer 1

我已经解决了这个问题。

我已经在每个片段中实现了回调。并在MainFragmentActivity中替换这些片段。