Question

我正在尝试从ViewPager动态添加和删除片段，添加工作没有任何问题，但删除无法按预期工作。

每当我想删除当前项目时，最后一项将被删除。

我还尝试使用FragmentStatePagerAdapter或在适配器的getItemPosition方法中返回POSITION_NONE。

我做错了什么？

这是一个基本的例子：

MainActivity.java

public class MainActivity extends FragmentActivity implements TextProvider {

    private Button mAdd;
    private Button mRemove;
    private ViewPager mPager;

    private MyPagerAdapter mAdapter;

    private ArrayList<String> mEntries = new ArrayList<String>();

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        mEntries.add("pos 1");
        mEntries.add("pos 2");
        mEntries.add("pos 3");
        mEntries.add("pos 4");
        mEntries.add("pos 5");

        mAdd = (Button) findViewById(R.id.add);
        mRemove = (Button) findViewById(R.id.remove);
        mPager = (ViewPager) findViewById(R.id.pager);

        mAdd.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                addNewItem();
            }
        });

        mRemove.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                removeCurrentItem();
            }
        });

        mAdapter = new MyPagerAdapter(this.getSupportFragmentManager(), this);

        mPager.setAdapter(mAdapter);

    }

    private void addNewItem() {
        mEntries.add("new item");
        mAdapter.notifyDataSetChanged();
    }

    private void removeCurrentItem() {
        int position = mPager.getCurrentItem();
        mEntries.remove(position);
        mAdapter.notifyDataSetChanged();
    }

    @Override
    public String getTextForPosition(int position) {
        return mEntries.get(position);
    }
    @Override
    public int getCount() {
        return mEntries.size();
    }


    private class MyPagerAdapter extends FragmentPagerAdapter {

        private TextProvider mProvider;

        public MyPagerAdapter(FragmentManager fm, TextProvider provider) {
            super(fm);
            this.mProvider = provider;
        }

        @Override
        public Fragment getItem(int position) {
            return MyFragment.newInstance(mProvider.getTextForPosition(position));
        }

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

    }

}

TextProvider.java

public interface TextProvider {
    public String getTextForPosition(int position);
    public int getCount();
}

MyFragment.java

public class MyFragment extends Fragment {

    private String mText;

    public static MyFragment newInstance(String text) {
        MyFragment f = new MyFragment(text);
        return f;
    }

    public MyFragment() {
    }

    public MyFragment(String text) {
        this.mText = text;
    }

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

        View root = inflater.inflate(R.layout.fragment, container, false);

        ((TextView) root.findViewById(R.id.position)).setText(mText);

        return root;
    }

}

activity_main.xml中

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <Button
        android:id="@+id/add"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="add new item" />

    <Button
        android:id="@+id/remove"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="remove current item" />

    <android.support.v4.view.ViewPager
        android:id="@+id/pager"
        android:layout_width="match_parent"
        android:layout_height="0dip"
        android:layout_weight="1" />

</LinearLayout>

fragment.xml之

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/position"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:textSize="35sp" />

</LinearLayout>

Answer 1

ViewPager不会使用上面的代码删除您的片段，因为它会将多个视图（或您的案例中的片段）加载到内存中。除了可见视图外，它还将视图加载到可见视图的任一侧。这提供了从视图到视图的平滑滚动，使ViewPager变得如此酷。

为了达到你想要的效果，你需要做一些事情。

将FragmentPagerAdapter更改为FragmentStatePagerAdapter。这样做的原因是FragmentPagerAdapter会将它加载的所有视图永久保存到内存中。 FragmentStatePagerAdapter处理位于当前和可遍历视图之外的视图。
覆盖适配器方法getItemPosition（如下所示）。当我们调用mAdapter.notifyDataSetChanged();时，ViewPager会询问适配器以确定在定位方面发生了哪些变化。我们使用此方法表示所有内容都已更改，因此重新处理所有视图定位。

这是代码......

private class MyPagerAdapter extends FragmentStatePagerAdapter {

    //... your existing code

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

}

Answer 2

Louth的解决方案还不足以让事情对我起作用，因为现有的碎片并没有被破坏。受this answer的启发，我发现解决方案是覆盖getItemId(int position) FragmentPagerAdapter方法，以便在片段的预期位置发生变化时提供新的唯一ID。 / p>

源代码：

private class MyPagerAdapter extends FragmentPagerAdapter {

    private TextProvider mProvider;
    private long baseId = 0;

    public MyPagerAdapter(FragmentManager fm, TextProvider provider) {
        super(fm);
        this.mProvider = provider;
    }

    @Override
    public Fragment getItem(int position) {
        return MyFragment.newInstance(mProvider.getTextForPosition(position));
    }

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


    //this is called when notifyDataSetChanged() is called
    @Override
    public int getItemPosition(Object object) {
        // refresh all fragments when data set changed
        return PagerAdapter.POSITION_NONE;
    }


    @Override
    public long getItemId(int position) {
        // give an ID different from position when position has been changed
        return baseId + position;
    }

    /**
     * Notify that the position of a fragment has been changed.
     * Create a new ID for each position to force recreation of the fragment
     * @param n number of items which have been changed
     */
    public void notifyChangeInPosition(int n) {
        // shift the ID returned by getItemId outside the range of all previous fragments
        baseId += getCount() + n;
    }
}

现在，例如，如果删除单个标签或对订单进行一些更改，则应在调用notifyChangeInPosition(1)之前调用notifyDataSetChanged()，这将确保重新创建所有片段。

为什么这个解决方案有效

覆盖getItemPosition（）：

调用notifyDataSetChanged()时，适配器会调用它所附加的notifyChanged()的{{1}}方法。然后，ViewPager检查适配器ViewPager为每个项返回的值，删除返回getItemPosition()的项目（请参阅source code），然后重新填充。

覆盖getItemId（）：

这有必要防止适配器在POSITION_NONE重新填充时重新加载旧片段。您可以通过在ViewPager中查看the source code的instantiateItem（）来轻松了解其工作原理。

FragmentPagerAdapter

如您所见，只有在片段管理器找不到具有相同Id的现有片段时，才会调用final long itemId = getItemId(position); // Do we already have this fragment? String name = makeFragmentName(container.getId(), itemId); Fragment fragment = mFragmentManager.findFragmentByTag(name); if (fragment != null) { if (DEBUG) Log.v(TAG, "Attaching item #" + itemId + ": f=" + fragment); mCurTransaction.attach(fragment); } else { fragment = getItem(position); if (DEBUG) Log.v(TAG, "Adding item #" + itemId + ": f=" + fragment); mCurTransaction.add(container.getId(), fragment, makeFragmentName(container.getId(), itemId)); }方法。对我来说，即使在调用getItem()之后，旧片段仍然附着似乎是一个错误，但notifyDataSetChanged()的文档确实明确指出：

请注意，此课程目前正在进行早期设计和开发。 API可能会在以后的兼容库更新中发生变化，需要在针对较新版本编译时更改应用程序的源代码。

所以希望在未来版本的支持库中不需要这里给出的解决方法。

Answer 3

我的工作解决方案，从视图寻呼机中删除片段页

public class MyFragmentAdapter extends FragmentStatePagerAdapter {

    private ArrayList<ItemFragment> pages;

    public MyFragmentAdapter(FragmentManager fragmentManager, ArrayList<ItemFragment> pages) {
        super(fragmentManager);
        this.pages = pages;
    }

    @Override
    public Fragment getItem(int index) {
        return pages.get(index);
    }

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

    @Override
    public int getItemPosition(Object object) {
        int index = pages.indexOf (object);

        if (index == -1)
            return POSITION_NONE;
        else
            return index;
    }
}

当我需要按索引删除某些页面时，我会这样做

pages.remove(position); // ArrayList<ItemFragment>
adapter.notifyDataSetChanged(); // MyFragmentAdapter

这是我的适配器初始化

MyFragmentAdapter adapter = new MyFragmentAdapter(getSupportFragmentManager(), pages);
viewPager.setAdapter(adapter);

Answer 4

必须已删除片段，但问题是viewpager save state

尝试

myViewPager.setSaveFromParentEnabled(false);

没有任何效果，但这解决了这个问题！

干杯！

Answer 5

我只想将源代码从android.support.v4.app.FragmentPagerAdpater复制到名为的自定义类中 CustumFragmentPagerAdapter。这使我有机会修改instantiateItem(...)，以便每次调用它时，它会删除/销毁当前附加的片段，然后再添加从getItem()方法接收的新片段。

只需按以下方式修改instantiateItem(...)：

@Override
public Object instantiateItem(ViewGroup container, int position) {
    if (mCurTransaction == null) {
        mCurTransaction = mFragmentManager.beginTransaction();
    }
    final long itemId = getItemId(position);

    // Do we already have this fragment?
    String name = makeFragmentName(container.getId(), itemId);
    Fragment fragment = mFragmentManager.findFragmentByTag(name);

    // remove / destroy current fragment
    if (fragment != null) {
        mCurTransaction.remove(fragment);
    }

    // get new fragment and add it
    fragment = getItem(position);
    mCurTransaction.add(container.getId(), fragment,    makeFragmentName(container.getId(), itemId));

    if (fragment != mCurrentPrimaryItem) {
        fragment.setMenuVisibility(false);
        fragment.setUserVisibleHint(false);
    }

    return fragment;
}

Answer 6

您可以将两者结合起来更好：

private class MyPagerAdapter extends FragmentStatePagerAdapter {

    //... your existing code

    @Override
    public int getItemPosition(Object object){

      if(Any_Reason_You_WantTo_Update_Positions) //this includes deleting or adding pages
 return PagerAdapter.POSITION_NONE;
    }
else
return PagerAdapter.POSITION_UNCHANGED; //this ensures high performance in other operations such as editing list items.

}

Answer 7

动态添加或删除viewpager中的片段在活动开始时调用setupViewPager（viewPager）。加载不同的片段调用setupViewPagerCustom（viewPager）。例如按钮单击调用：setupViewPagerCustom（viewPager）;

    private void setupViewPager(ViewPager viewPager)
{
    ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
    adapter.addFrag(new fragmnet1(), "HOME");
    adapter.addFrag(new fragmnet2(), "SERVICES");

    viewPager.setAdapter(adapter);
}

private void setupViewPagerCustom(ViewPager viewPager)
{

    ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());

    adapter.addFrag(new fragmnet3(), "Contact us");
    adapter.addFrag(new fragmnet4(), "ABOUT US");


    viewPager.setAdapter(adapter);
}

//Viewpageradapter, handles the views

static class ViewPagerAdapter extends FragmentStatePagerAdapter
{
    private final List<Fragment> mFragmentList = new ArrayList<>();
    private final List<String> mFragmentTitleList = new ArrayList<>();

    public ViewPagerAdapter(FragmentManager manager){
        super(manager);
    }

    @Override
    public Fragment getItem(int position) {
        return mFragmentList.get(position);
    }

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

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

    public void addFrag(Fragment fragment, String title){
        mFragmentList.add(fragment);
        mFragmentTitleList.add(title);
    }

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

Answer 8

现在2020。

简单地将其添加到PageAdapter：

override fun getItemPosition(`object`: Any): Int {
    return PagerAdapter.POSITION_NONE
}

Answer 9

供将来的读者使用！

现在，您可以使用ViewPager2进行动态添加，并从viewpager中删除片段。

引用表单API reference

ViewPager2取代了ViewPager，解决了其大多数前代产品痛点，包括从右到左的布局支持，垂直方向，可修改的Fragment集合等。

以MutableCollectionFragmentActivity.kt中的googlesample/android-viewpager2为例，介绍如何从viewpager中动态添加和删除片段。

供您参考：

文章：

API reference

Release notes

样品回购：https://github.com/googlesamples/android-viewpager2

Answer 10

我通过以下步骤解决了这个问题

1-使用FragmentPagerAdapter

2-在每个片段中创建一个随机ID

fragment.id = new Random().nextInt();

3-覆盖适配器中的getItemPosition

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

在适配器中

4-override getItemId

 @Override
public long getItemId(int position) {
    return mDatasetFragments.get(position).id;
}

5-现在删除代码为

 adapter.mDatasetFragments.remove(< item to delete position >);
 adapter.notifyDataSetChanged();

这对我有用，希望对您有帮助

Answer 11

您可以覆盖destroyItem方法

@Override
public void destroyItem(ViewGroup container, int position, Object object) {
    fragmentManager.beginTransaction().remove((Fragment) object).commitNowAllowingStateLoss();
}

Answer 12

我添加了一个功能“ clearFragments”，并在设置新片段之前使用该功能清除了适配器。这调用了片段的适当删除操作。我的pagerAdapter类：

private class ChartPagerAdapter extends FragmentPagerAdapter{
    private ArrayList<Fragment> fragmentList;

    ChartPagerAdapter(FragmentManager fm){
        super(fm);
        fragmentList = new ArrayList<>();
    }

    void setFragments(ArrayList<? extends Fragment> fragments){
        fragmentList.addAll(fragments);
    }

    void clearFragments(){
        for(Fragment fragment:fragmentList)
            getChildFragmentManager().beginTransaction().remove(fragment).commit();
        fragmentList.clear();
    }

    @Override
    public Fragment getItem(int i) {
        return fragmentList.get(i);
    }

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

}

Answer 13

尝试此解决方案。我已经使用数据绑定来绑定视图。您可以使用常见的“ findViewById（）”函数。

public class ActCPExpense extends BaseActivity implements View.OnClickListener,  {
private static final String TAG = ActCPExpense.class.getSimpleName();
private Context mContext;
private ActCpLossBinding mBinding;

private ViewPagerAdapter adapter;



@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    try {
        setContentView(R.layout.act_cp_loss);
        mBinding = DataBindingUtil.setContentView(this, R.layout.act_cp_loss);
        mContext = ActCPExpense.this;
        initViewsAct();


    } catch (Exception e) {
        LogUtils.LOGE(TAG, e);
    }

}


private void initViewsAct() {

    adapter = new ViewPagerAdapter(getSupportFragmentManager());
    adapter.addFragment(FragmentCPPayee.newInstance(), "Title");
    mBinding.viewpager.setAdapter(adapter);
    mBinding.tab.setViewPager(mBinding.viewpager);



}



@Override
public boolean onOptionsItemSelected(MenuItem itemActUtility) {
    int i = itemActUtility.getItemId();
    if (i == android.R.id.home) {
        onBackPressed();

    } 

    return super.onOptionsItemSelected(itemActUtility);
}

@Override
public void onClick(View view) {
    super.onClick(view);
    int id = view.getId();
    if (id == R.id.btnAdd) {
        addFragment();

    } else if (id == R.id.btnDelete) {
        removeFragment();

    }


}
    private void addFragment(){
    adapter.addFragment(FragmentCPPayee.newInstance("Title");
    adapter.notifyDataSetChanged();
    mBinding.tab.setViewPager(mBinding.viewpager);
}
private void removeFragment(){
    adapter.removeItem(mBinding.viewpager.getCurrentItem());
    mBinding.tab.setViewPager(mBinding.viewpager);
}


class ViewPagerAdapter extends FragmentStatePagerAdapter {
    private final List<Fragment> mFragmentList = new ArrayList<>();
    private final List<String> mFragmentTitleList = new ArrayList<>();


    public ViewPagerAdapter(FragmentManager manager) {
        super(manager);
    }

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


    @Override
    public Fragment getItem(int position) {
        return mFragmentList.get(position);
    }

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


    public void addFragment(Fragment fragment, String title) {
        mFragmentList.add(fragment);
        mFragmentTitleList.add(title);

    }

    public void removeItem(int pos) {

        destroyItem(null, pos, mFragmentList.get(pos));
        mFragmentList.remove(pos);
        mFragmentTitleList.remove(pos);
        adapter.notifyDataSetChanged();
        mBinding.viewpager.setCurrentItem(pos - 1, false);
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return "Title " + String.valueOf(position + 1);
    }
}


}

Answer 14

FragmentStatePagerAdapter我遇到了一些问题。删除项目后：

还有另一个用于某个位置的项目（一个不属于该位置但位于该位置旁边的位置的项目）
或某些片段未加载（该页面上只显示空白背景）

经过大量实验，我想出了以下解决方案。

public class SomeAdapter extends FragmentStatePagerAdapter {

    private List<Item> items = new ArrayList<Item>();

    private boolean removing;

    @Override
    public Fragment getItem(int position) {
        ItemFragment fragment = new ItemFragment();
        Bundle args = new Bundle();
        // use items.get(position) to configure fragment
        fragment.setArguments(args);
        return fragment;
    }

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

    @Override
    public int getItemPosition(Object object) {
        if (removing) {
            return PagerAdapter.POSITION_NONE;
        }

        Item item = getItemOfFragment(object);

        int index = items.indexOf(item);
        if (index == -1) {
            return POSITION_NONE;
        } else {
            return index;
        }
    }

   public void addItem(Item item) {
        items.add(item);
        notifyDataSetChanged();
    }

    public void removeItem(int position) {
        items.remove(position);

        removing = true;
        notifyDataSetChanged();
        removing = false;
    }
}

此解决方案仅在删除项目时使用hack。否则（例如，在添加项目时）它会保留原始代码的清洁度和性能。

当然，从适配器的外部，你只调用addItem / removeItem，不需要调用notifyDataSetChanged（）。

Answer 15

Louth的回答很好。但我不认为总是返回POSITION_NONE是一个好主意。因为POSITION_NONE意味着应该销毁片段并创建一个新片段。您可以在ViewPager的源代码中的dataSetChanged函数中检查它。

        if (newPos == PagerAdapter.POSITION_NONE) {
            mItems.remove(i);
            i--;
            ... not related code
            mAdapter.destroyItem(this, ii.position, ii.object);

所以我认为你最好使用weakReference的arraylist来保存你创建的所有片段。当你添加或删除一些页面时，你可以从你自己的arraylist中获得正确的位置。

 public int getItemPosition(Object object) {
    for (int i = 0; i < mFragmentsReferences.size(); i ++) {
        WeakReference<Fragment> reference = mFragmentsReferences.get(i);
        if (reference != null && reference.get() != null) {
            Fragment fragment = reference.get();
            if (fragment == object) {
                return i;
            }
        }
    }
    return POSITION_NONE;
}

根据评论，当主机视图尝试确定项目的位置是否已更改时，将调用getItemPosition。返回值意味着它的新位置。

但这不是应该的。我们仍然迈出重要的一步。在FragmentStatePagerAdapter的源代码中，有一个名为“mFragments”的数组缓存未被破坏的片段。并在instantiateItem函数中。

if (mFragments.size() > position) {
        Fragment f = mFragments.get(position);
        if (f != null) {
            return f;
        }
    }

当它发现缓存片段不为空时，它直接返回缓存片段。所以有一个问题。例如，让我们删除位置2处的一个页面。首先，我们从我们自己的参考arraylist中删除该片段。所以在getItemPosition中它将返回该片段的POSITION_NONE，然后该片段将被销毁并从“mFragments”中删除。

 mFragments.set(position, null);

现在位置3处的片段将位于位置2.并且将调用具有参数位置3的instantiatedItem。此时，“mFramgents”中的第三项不为null，因此它将直接返回。但实际上它返回的是第2位的片段。所以当我们转到第3页时，我们会在那里找到一个空页。

解决此问题。我的建议是你可以将FragmentStatePagerAdapter的源代码复制到你自己的项目中，当你添加或删除操作时，你应该添加和删除“mFragments”arraylist中的元素。

如果您只使用PagerAdapter而不是FragmentStatePagerAdapter，事情就会变得更简单。祝你好运。

Answer 16

我的最终版本代码，修复了所有错误。我花了3天时间

https://github.com/lin1987www/FragmentBuilder/blob/master/app/src/main/java/android/support/v4/app/FragmentStatePagerAdapterFix.java

public class FragmentStatePagerAdapterFix extends PagerAdapter {
    private static final String TAG = FragmentStatePagerAdapterFix.class.getSimpleName();
    private static final boolean DEBUG = false;

    private WeakReference<FragmentActivity> wrFragmentActivity;
    private WeakReference<Fragment> wrParentFragment;
    private final FragmentManager mFragmentManager;
    private FragmentTransaction mCurTransaction = null;

    protected ArrayList<Fragment> mFragments = new ArrayList<>();
    protected ArrayList<FragmentState> mFragmentStates = new ArrayList<>();
    protected ArrayList<String> mFragmentTags = new ArrayList<>();
    protected ArrayList<String> mFragmentClassNames = new ArrayList<>();
    protected ArrayList<Bundle> mFragmentArgs = new ArrayList<>();

    private Fragment mCurrentPrimaryItem = null;
    private boolean[] mTempPositionChange;

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

    public FragmentActivity getFragmentActivity() {
        return wrFragmentActivity.get();
    }

    public Fragment getParentFragment() {
        return wrParentFragment.get();
    }

    public FragmentStatePagerAdapterFix(FragmentActivity activity) {
        mFragmentManager = activity.getSupportFragmentManager();
        wrFragmentActivity = new WeakReference<>(activity);
        wrParentFragment = new WeakReference<>(null);
    }

    public FragmentStatePagerAdapterFix(Fragment fragment) {
        mFragmentManager = fragment.getChildFragmentManager();
        wrFragmentActivity = new WeakReference<>(fragment.getActivity());
        wrParentFragment = new WeakReference<>(fragment);
    }

    public void add(Class<? extends android.support.v4.app.Fragment> fragClass) {
        add(fragClass, null, null);
    }

    public void add(Class<? extends android.support.v4.app.Fragment> fragClass, Bundle args) {
        add(fragClass, args, null);
    }

    public void add(Class<? extends android.support.v4.app.Fragment> fragClass, String tag) {
        add(fragClass, null, tag);
    }

    public void add(Class<? extends android.support.v4.app.Fragment> fragClass, Bundle args, String tag) {
        add(fragClass, args, tag, getCount());
    }

    public void add(Class<? extends android.support.v4.app.Fragment> fragClass, Bundle args, String tag, int position) {
        mFragments.add(position, null);
        mFragmentStates.add(position, null);
        mFragmentTags.add(position, tag);
        mFragmentClassNames.add(position, fragClass.getName());
        mFragmentArgs.add(position, args);
        mTempPositionChange = new boolean[getCount()];
    }

    public void remove(int position) {
        if (position < getCount()) {
            mTempPositionChange = new boolean[getCount()];
            for (int i = position; i < mTempPositionChange.length; i++) {
                mTempPositionChange[i] = true;
            }
            mFragments.remove(position);
            mFragmentStates.remove(position);
            mFragmentTags.remove(position);
            mFragmentClassNames.remove(position);
            mFragmentArgs.remove(position);
        }
    }

    public void clear(){
        mFragments.clear();
        mFragmentStates.clear();
        mFragmentTags.clear();
        mFragmentClassNames.clear();
        mFragmentArgs.clear();
    }

    @Override
    public void startUpdate(ViewGroup container) {
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        Fragment fragment;
        // If we already have this item instantiated, there is nothing
        // to do.  This can happen when we are restoring the entire pager
        // from its saved state, where the fragment manager has already
        // taken care of restoring the fragments we previously had instantiated.
        fragment = mFragments.get(position);
        if (fragment != null) {
            return fragment;
        }
        if (mCurTransaction == null) {
            mCurTransaction = mFragmentManager.beginTransaction();
        }
        FragmentState fs = mFragmentStates.get(position);
        if (fs != null) {
            fragment = fs.instantiate(getFragmentActivity(), getParentFragment());
            // Fix bug
            // http://stackoverflow.com/questions/11381470/classnotfoundexception-when-unmarshalling-android-support-v4-view-viewpagersav
            if (fragment.mSavedFragmentState != null) {
                fragment.mSavedFragmentState.setClassLoader(fragment.getClass().getClassLoader());
            }
        }
        if (fragment == null) {
            fragment = Fragment.instantiate(getFragmentActivity(), mFragmentClassNames.get(position), mFragmentArgs.get(position));
        }
        if (DEBUG) {
            Log.v(TAG, "Adding item #" + position + ": f=" + fragment);
        }
        fragment.setMenuVisibility(false);
        fragment.setUserVisibleHint(false);
        mFragments.set(position, fragment);
        mFragmentStates.set(position, null);
        mCurTransaction.add(container.getId(), fragment, mFragmentTags.get(position));
        return fragment;
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        Fragment fragment = (Fragment) object;
        if (mCurTransaction == null) {
            mCurTransaction = mFragmentManager.beginTransaction();
        }
        if (DEBUG) {
            Log.v(TAG, "Removing item #" + position + ": f=" + object
                    + " v=" + ((Fragment) object).getView());
        }
        if (position < getCount()) {
            FragmentState fragmentState = new FragmentState(fragment);
            Fragment.SavedState savedState = mFragmentManager.saveFragmentInstanceState(fragment);
            if (savedState != null) {
                fragmentState.mSavedFragmentState = savedState.mState;
            }
            mFragmentStates.set(position, fragmentState);
            mFragments.set(position, null);
        }
        mCurTransaction.remove(fragment);
    }

    @Override
    public void setPrimaryItem(ViewGroup container, int position, Object object) {
        Fragment fragment = (Fragment) object;
        if (fragment != mCurrentPrimaryItem) {
            if (mCurrentPrimaryItem != null) {
                mCurrentPrimaryItem.setMenuVisibility(false);
                mCurrentPrimaryItem.setUserVisibleHint(false);
            }
            if (fragment != null) {
                fragment.setMenuVisibility(true);
                fragment.setUserVisibleHint(true);
            }
            mCurrentPrimaryItem = fragment;
        }
    }

    @Override
    public void finishUpdate(ViewGroup container) {
        if (mCurTransaction != null) {
            mCurTransaction.commitAllowingStateLoss();
            mCurTransaction = null;
            mFragmentManager.executePendingTransactions();
            // Fix: Fragment is added by transaction. BUT didn't add to FragmentManager's mActive.
            for (Fragment fragment : mFragments) {
                if (fragment != null) {
                    fixActiveFragment(mFragmentManager, fragment);
                }
            }
        }
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
        return ((Fragment) object).getView() == view;
    }

    @Override
    public Parcelable saveState() {
        Bundle state = null;
        // 目前顯示的 Fragments
        for (int i = 0; i < mFragments.size(); i++) {
            Fragment f = mFragments.get(i);
            if (f != null && f.isAdded()) {
                if (state == null) {
                    state = new Bundle();
                }
                String key = "f" + i;
                mFragmentManager.putFragment(state, key, f);
            }
        }
        if (mFragmentStates.size() > 0) {
            if (state == null) {
                state = new Bundle();
            }
            FragmentState[] fs = new FragmentState[mFragmentStates.size()];
            mFragmentStates.toArray(fs);
            state.putParcelableArray("states_fragment", fs);
        }
        return state;
    }

    @Override
    public void restoreState(Parcelable state, ClassLoader loader) {
        if (state != null) {
            Bundle bundle = (Bundle) state;
            bundle.setClassLoader(loader);
            Parcelable[] fs = bundle.getParcelableArray("states_fragment");
            mFragments.clear();
            mFragmentStates.clear();
            mFragmentTags.clear();
            mFragmentClassNames.clear();
            mFragmentArgs.clear();
            if (fs != null) {
                for (int i = 0; i < fs.length; i++) {
                    FragmentState fragmentState = (FragmentState) fs[i];
                    mFragmentStates.add(fragmentState);
                    if (fragmentState != null) {
                        mFragmentArgs.add(fragmentState.mArguments);
                        mFragmentTags.add(fragmentState.mTag);
                        mFragmentClassNames.add(fragmentState.mClassName);
                    } else {
                        mFragmentArgs.add(null);
                        mFragmentTags.add(null);
                        mFragmentClassNames.add(null);
                    }
                    mFragments.add(null);
                }
            }
            Iterable<String> keys = bundle.keySet();
            for (String key : keys) {
                if (key.startsWith("f")) {
                    int index = Integer.parseInt(key.substring(1));
                    Fragment f = mFragmentManager.getFragment(bundle, key);
                    if (f != null) {
                        f.setMenuVisibility(false);
                        mFragments.set(index, f);
                        mFragmentArgs.set(index, f.mArguments);
                        mFragmentTags.set(index, f.mTag);
                        mFragmentClassNames.set(index, f.getClass().getName());
                    } else {
                        Log.w(TAG, "Bad fragment at key " + key);
                    }
                }
            }
            // If restore will change
            notifyDataSetChanged();
        }
    }

    public static void fixActiveFragment(FragmentManager fragmentManager, Fragment fragment) {
        FragmentManagerImpl fm = (FragmentManagerImpl) fragmentManager;
        if (fm.mActive != null) {
            int index = fragment.mIndex;
            Fragment origin = fm.mActive.get(index);
            if (origin != null) {
                if ((origin.mIndex != fragment.mIndex) || !(origin.equals(fragment))) {
                    Log.e(TAG,
                            String.format("fixActiveFragment: Not Equal! Origin: %s %s, Fragment: %s $s",
                                    origin.getClass().getName(), origin.mIndex,
                                    fragment.getClass().getName(), fragment.mIndex
                            ));
                }
            }
            fm.mActive.set(index, fragment);
        }
    }

    // Fix
    // http://stackoverflow.com/questions/10396321/remove-fragment-page-from-viewpager-in-android
    @Override
    public int getItemPosition(Object object) {
        int index = mFragments.indexOf(object);
        if (index < 0) {
            return PagerAdapter.POSITION_NONE;
        }
        boolean isPositionChange = mTempPositionChange[index];
        int result = PagerAdapter.POSITION_UNCHANGED;
        if (isPositionChange) {
            result = PagerAdapter.POSITION_NONE;
        }
        return result;
    }
}

Answer 17

我希望这可以帮到你想要的东西。

private class MyPagerAdapter extends FragmentStatePagerAdapter {

    //... your existing code

    @Override
    public int getItemPosition(Object object){
        return PagerAdapter.POSITION_UNCHANGED;
    }
}

从Android中的ViewPager中删除片段页面

17 个答案:

源代码：

为什么这个解决方案有效