与ViewPager没有要求ViewPager ActionBarSherlock片段会从堆栈中返回

我有一个使用ActionBarSherlock和主片段内我有使用几个片段显示一个列表的不同对象ViewPager的应用程序。

机头：

    public class CollectionDemoFragment extends SherlockFragment {

    DemoCollectionPagerAdapter mDemoCollectionPagerAdapter;
    ViewPager mViewPager;

    public CollectionDemoFragment() {
        setTitle(R.string.title);
        setHasOptionsMenu(true);
    }

    public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.demo_fragment, container, false);
        mDemoCollectionPagerAdapter = new DemoCollectionPagerAdapter(getFragmentManager());
        mViewPager = (ViewPager) findViewById(R.id.pager);
        mViewPager.setAdapter(mDemoCollectionPagerAdapter);
        return view;
    }

    @Override
    public void onPause() {
        //This runs when the fragment goes to backstack
        super.onPause();
    }

    @Override
    public void onResume() {
        //This runs when the fragment returns from backstack
        super.onResume();
    }
}

ViewPagerAdapter：

public class DemoCollectionPagerAdapter extends
        FragmentStatePagerAdapter {
    public DemoCollectionPagerAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int i) {
        Fragment fragment = new DemoObjectFragment();
        Bundle args = new Bundle();
        args.putInt(DemoObjectFragment.ARG_OBJECT, i + 1);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public int getItemPosition(Object object) {
        return POSITION_NONE;
    }

    @Override
    public int getCount() {
        return 100;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return "OBJECT " + (position + 1);
    }
}

每个里面这个片段，我可以创造一个新的主片段与新的列表中ViewPager显示和更换新片段的内容。

ViewPager片段：

public static class DemoObjectFragment extends Fragment {
    public static final String ARG_OBJECT = "object";

    @Override
    public View onCreateView(LayoutInflater inflater,
            ViewGroup container, Bundle savedInstanceState) {

        View rootView = inflater.inflate(
                R.layout.fragment_collection_object, container, false);
        Bundle args = getArguments();
        ((TextView) rootView.findViewById(android.R.id.text1)).setText(
                Integer.toString(args.getInt(ARG_OBJECT)));
             //Setup components

        return rootView;
    }   

    @Override
    public void setMenuVisibility(final boolean visible) {
        if (visible) {
            //Do something
        }
        super.setMenuVisibility(visible);
    }

    @Override
    public void onPause() {
        //This should run when the fragment goes to backstack
        super.onPause();
    }

    @Override
    public void onResume() {
        //This should run when the fragment returns from backstack
        super.onResume();
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.someComponent:
            Fragment newContent = new CollectionDemoFragment();
            switchContent(newContent, true);
            break;
        }
    }

    public void switchContent(Fragment newContent, boolean addToBackStack) {
        if (newContent != null) {
            FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
            ft.setCustomAnimations(android.R.anim.fade_in, android.R.anim.fade_out);
            ft.replace(R.id.content_frame, newContent);
            if (addToBackStack) {
                ft.addToBackStack("" + newContent.getId());
            }
            ft.commit();
        }
    }
}

直到我压回，并从返回堆栈先前的主片段返回该工程确定。

屏幕是空的（由于onCreateView不叫布局不膨胀），从在ViewPager片段生命周期方法从来不被称为或者当主片段进入返回堆栈，也不返回时。 称为在ViewPager的片段的唯一方法是setMenuVisibility（），因此，仅在有运行的代码。

任何人都知道的方式来解决这个问题，为什么出现这种情况？

如果它很重要，但我由于Android 2.3支持不知道。

Answer 1:

当你创建视图适配器，您必须通过片段子管理者作为参数- getChildFragmentManager()代替getFragmentManager()

代替，

 mDemoCollectionPagerAdapter = new DemoCollectionPagerAdapter(getFragmentManager());

你应该使用，

 mDemoCollectionPagerAdapter = new DemoCollectionPagerAdapter(getChildFragmentManager());

文章来源: ActionBarSherlock with ViewPager not calling ViewPager fragments lifecycle methods when going to and returning from backstack