当ViewPager的父片段隐藏后显示时,ViewPager的片段的视图丢失

Question

-> (1) Fragment root view (RelativeLayout)
 -> (2) ViewPager
  -> (3) ViewPager's current fragment view

我找到的唯一解决办法就是打电话给

int current = myViewPager.getCurrentItem();
myViewPager.setAdapter(myAdapter);
myViewPager.setCurrentItem(current);

在显示父片段之后。这会以某种方式触发视图被重新创建并出现在屏幕上。不幸的是，这有时会导致在旧的观察器上处理两次调用UnregisterDataSetObserver()的寻呼机适配器时出现异常。

有没有更好的办法做到这一点？我想我要问的是：

public class MyInfoSlidePagerAdapter extends FragmentStatePagerAdapter {

    private ArrayList<MyInfo> infos = new ArrayList<MyInfo>();

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

    public MyInfoSlidePagerAdapter (FragmentManager fm, MyInfo[] newInfos) {
        super(fm);
        setInfos(newInfos);
    }

    @Override
    public int getItemPosition(Object object) {
        int position = infos.indexOf(((MyInfoDetailsFragment)object).getMyInfo());
        return position > 0 ? position : POSITION_NONE;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return infos.get(position).getName();
    }

    @Override
    public Fragment getItem(int i) {
        return infos.size() > 0 ? MyInfoDetailsFragment.getNewInstance(infos.get(i)) : null;
    }

    @Override
    public int getCount() {
        return infos.size();
    }

    public Location getMyInfoAtPosition(int i) {
        return infos.get(i);
    }

    public void setInfos(MyInfo[] newInfos) {
        infos = new ArrayList<MyInfo>(Arrays.asList(newInfos));
    }

    public int getPositionOfMyInfo(MyInfo info) {
        return infos.indexOf(info);
    }
}

Answer 1

您没有为您的特定问题提供足够的信息，因此我创建了一个示例项目，试图重现您的问题：应用程序有一个活动，它在相对布局中保存一个片段(PagerFragment)，在这个布局下面有一个按钮，它隐藏并显示在PagerFragment上面。PagerFragment有一个ViewPager，寻呼机适配器中的每个片段只显示一个标签--这个片段被命名为DataFragment。标签列表在父活动中创建，并传递给PagerFragment，然后通过其适配器传递给每个DataFragment。更改pagerfragment可见性时没有任何问题，每次它再次可见时，都会显示以前显示的标签。

问题的关键是：在创建viewpager适配器时使用片段#getChildFragmentManager()而不是getFragmentManager！

也许您可以将这个简单的项目与您所拥有的进行比较，检查差异在哪里。下面是（自上而下）：

public class PagerActivity extends FragmentActivity {

    private static final String PAGER_TAG = "PagerActivity.PAGER_TAG";

    @Override
    protected void onCreate(Bundle savedInstance) {
        super.onCreate(savedInstance);
        setContentView(R.layout.pager_activity);
        if (savedInstance == null) {
            PagerFragment frag = PagerFragment.newInstance(buildPagerData());
            FragmentManager fm = getSupportFragmentManager();
            fm.beginTransaction().add(R.id.layout_fragments, frag, PAGER_TAG).commit();
        }
        findViewById(R.id.btnFragments).setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                changeFragmentVisibility();
            }
        });
    }

    private List<String> buildPagerData() {
        ArrayList<String> pagerData = new ArrayList<String>();
        pagerData.add("Robert de Niro");
        pagerData.add("John Smith");
        pagerData.add("Valerie Irons");
        pagerData.add("Metallica");
        pagerData.add("Rammstein");
        pagerData.add("Zinedine Zidane");
        pagerData.add("Ronaldo da Lima");
        return pagerData;
    }

    protected void changeFragmentVisibility() {
        Fragment frag = getSupportFragmentManager().findFragmentByTag(PAGER_TAG);
        if (frag == null) {
            Toast.makeText(this, "No PAGER fragment found", Toast.LENGTH_SHORT).show();
            return;
        }
        boolean visible = frag.isVisible();
        Log.d("APSampler", "Pager fragment visibility: " + visible);
        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
        if (visible) {
            ft.hide(frag);
        } else {
            ft.show(frag);
        }
        ft.commit();
        getSupportFragmentManager().executePendingTransactions();
    }
}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="4dp" >

    <Button
        android:id="@+id/btnFragments"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:text="Hide/Show fragments" />

    <RelativeLayout
        android:id="@+id/layout_fragments"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_above="@+id/btnFragments"
        android:layout_marginBottom="4dp" >
    </RelativeLayout>

</RelativeLayout>

public class PagerFragment extends Fragment {

    private static final String DATA_ARGS_KEY = "PagerFragment.DATA_ARGS_KEY";

    private List<String> data;

    private ViewPager pagerData;

    public static PagerFragment newInstance(List<String> data) {
        PagerFragment pagerFragment = new PagerFragment();
        Bundle args = new Bundle();
        ArrayList<String> argsValue = new ArrayList<String>(data);
        args.putStringArrayList(DATA_ARGS_KEY, argsValue);
        pagerFragment.setArguments(args);
        return pagerFragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        data = getArguments().getStringArrayList(DATA_ARGS_KEY);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.pager_fragment, container, false);
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        pagerData = (ViewPager) view.findViewById(R.id.pager_data);
        setupPagerData();
    }

    private void setupPagerData() {
        PagerAdapter adapter = new LocalPagerAdapter(getChildFragmentManager(), data);
        pagerData.setAdapter(adapter);
    }

}

<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/pager_data"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

及其适配器：

public class LocalPagerAdapter extends FragmentStatePagerAdapter {
    private List<String> pagerData;

    public LocalPagerAdapter(FragmentManager fm, List<String> pagerData) {
        super(fm);
        this.pagerData = pagerData;
    }

    @Override
    public Fragment getItem(int position) {
        return DataFragment.newInstance(pagerData.get(position));
    }

    @Override
    public int getCount() {
        return pagerData.size();
    }
}

此适配器为每个页面创建DataFragment:

public class DataFragment extends Fragment {
    private static final String DATA_ARG_KEY = "DataFragment.DATA_ARG_KEY";

    private String localData;

    public static DataFragment newInstance(String data) {
        DataFragment df = new DataFragment();
        Bundle args = new Bundle();
        args.putString(DATA_ARG_KEY, data);
        df.setArguments(args);
        return df;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        localData = getArguments().getString(DATA_ARG_KEY);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.data_fragment, container, false);
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        view.findViewById(R.id.btn_page_action).setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                Toast.makeText(getActivity(), localData, Toast.LENGTH_SHORT).show();
            }
        });
        ((TextView) view.findViewById(R.id.txt_label)).setText(localData);
    }
}

和DataFragment的布局：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="4dp" >

    <Button
        android:id="@+id/btn_page_action"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:text="Interogate" />

    <TextView
        android:id="@+id/txt_label"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:textAppearance="?android:attr/textAppearanceLarge" />

</RelativeLayout>