Android TabHost中的ViewPager，具有作为页面的片段

我这里的情况很奇怪。我有一个

FragmentActivity

，它有一个带有5个选项卡的

TabHost

。在其中两个选项卡中，我有

ViewPager

。假设这些选项卡是“Tab-A”和“Tab-B”，现在Tab-A在其

ViewPager

中有3个片段，而Tab-B有2个片段。所有这些碎片都是不同的。我正在使用我的自定义

FragmentPagerAdapter

填充ViewPager。奇怪的是，当我从tab-A/tab-B切换到另一个选项卡并返回到它时，ViewPager不再显示片段，或者它显示一个或两个片段，而不是3个。甚至，有时候，tab-A的ViewPager中的片段（不是全部）显示到tab-B的ViewPager中，即使它们使用了两个不同的适配器

通过搜索，我了解到这可能是由于片段嵌套造成的（因为ViewPager位于片段中，其页面也是片段）。我已尝试传递FragmentPagerAdapter

getChildFragmentManager（）

而不是

getFragmentManager（）

。但在这种情况下，当我切换到另一个选项卡并返回到选项卡A/选项卡B时，应用程序崩溃（见下面的日志）

我正在下面粘贴我的代码。

碎片活动的布局

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!-- The main content view -->
<FrameLayout 
    android:id="@+id/content_frame"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
<TabHost
    android:id="@android:id/tabhost" 
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >
    <LinearLayout android:orientation="vertical"
        android:layout_width="fill_parent" 
        android:layout_height="fill_parent">

    <FrameLayout
        android:id="@android:id/tabcontent"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_weight="0"/>

    <FrameLayout
        android:id="@+android:id/realtabcontent"
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:layout_weight="1"/>

        <TabWidget android:id="@android:id/tabs"
            android:layout_width="fill_parent" 
            android:layout_height="wrap_content"
            android:layout_weight="0"  />
    </LinearLayout>
</TabHost> 
</FrameLayout>
<!-- The navigation drawer -->
<ListView android:id="@+id/left_drawer"
    android:layout_width="240dp"
    android:layout_height="match_parent"
    android:layout_gravity="start"
    android:choiceMode="singleChoice"
    android:background="@android:color/darker_gray"/>
</android.support.v4.widget.DrawerLayout>

这就是在选项卡中添加新片段或从中删除新片段的方式

public void pushFragments(String tag, Fragment fragment,boolean shouldAnimate, boolean shouldAdd){
  if(shouldAdd)
      mStacks.get(tag).push(fragment);
  FragmentManager   manager         =   getSupportFragmentManager();
  FragmentTransaction ft            =   manager.beginTransaction();
  if(shouldAnimate)
      ft.setCustomAnimations(R.anim.slide_in_right, R.anim.slide_out_left);
  ft.replace(R.id.realtabcontent, fragment);
  ft.commit();
}


public void popFragments(){
  /*    
   *    Select the second last fragment in current tab's stack.. 
   *    which will be shown after the fragment transaction given below 
   */
  Fragment fragment =   mStacks.get(mCurrentTab).elementAt(mStacks.get(mCurrentTab).size() - 2);

  /*pop current fragment from stack.. */
  mStacks.get(mCurrentTab).pop();

  /* We have the target fragment in hand.. Just show it.. Show a standard navigation animation*/
  FragmentManager   manager         =   getSupportFragmentManager();
  FragmentTransaction ft            =   manager.beginTransaction();
  ft.setCustomAnimations(R.anim.slide_in_left, R.anim.slide_out_right);
  ft.replace(R.id.realtabcontent, fragment);
  ft.commit();
}   


@Override
public void onBackPressed() 
{
    if(mStacks.get(mCurrentTab).size() == 1){
        super.onBackPressed();  // or call finish..
    }else{
        popFragments();
    }
}

下面是

片段

的布局，其中包含

查看页面

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.view.ViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/profile_pager"
android:layout_width="match_parent"
android:layout_height="match_parent" >

 <android.support.v4.view.PagerTabStrip
    android:id="@+id/pager_header"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="top"
    android:background="@color/bar_back"
    android:textColor="@android:color/holo_blue_light" />

</android.support.v4.view.ViewPager>

最后是

FragmentPagerAdapter

public class SearchPagerAdapter extends FragmentPagerAdapter{

ArrayList<Fragment>  Fragments;
final int PAGE_COUNT=3;
public SearchPagerAdapter(FragmentManager fm) 
{
    super(fm);
    // TODO Auto-generated constructor stub
    Fragments=new ArrayList<Fragment>();
    Fragments.add(new FragmentBasicSearch_());
    Fragments.add(new FragmentSearchSealed_());
    Fragments.add(new Fragment_Username_Search_());
}

@Override
public Fragment getItem(int pos) {
    // TODO Auto-generated method stub
    if(Fragments==null)
    {
        Fragments=new ArrayList<Fragment>();
        Fragments.add(new FragmentBasicSearch_());
        Fragments.add(new FragmentSearchSealed_());
        Fragments.add(new Fragment_Username_Search_());

    }

    if(pos<PAGE_COUNT)
    {
        Log.d("PF", "get pager fragment");
        return Fragments.get(pos);
    }

    return null;
}

@Override
public CharSequence getPageTitle(int position) {
    // TODO Auto-generated method stub
    switch (position)
    {
        case 0:
            return "BASIC SEARCH";

        case 1:
            return "SEALED SECTION SEARCH";

        case 2:
            return "UERNAME SEARCH";

    }
    return super.getPageTitle(position);
}

@Override
public int getCount() {
    // TODO Auto-generated method stub
    return PAGE_COUNT;
}

}

---

如有任何帮助或建议，将不胜感激

你查过下面的链接了吗。。我以前检查过其中两个，现在检查第三个。

@AfterViews
void InitiateViews()
{
    getActivity().getActionBar().setDisplayShowCustomEnabled(false);
    getActivity().getActionBar().setTitle("Dating");
    getActivity().getActionBar().setIcon(R.drawable.nav_dating);
    setHasOptionsMenu(true);

    Pager.setOffscreenPageLimit(2);
    SearchPagerAdapter adapter=new SearchPagerAdapter(getFragmentManager());
    Pager.setAdapter(adapter);
}

public class SearchPagerAdapter extends FragmentPagerAdapter{

ArrayList<Fragment>  Fragments;
final int PAGE_COUNT=3;
public SearchPagerAdapter(FragmentManager fm) 
{
    super(fm);
    // TODO Auto-generated constructor stub
    Fragments=new ArrayList<Fragment>();
    Fragments.add(new FragmentBasicSearch_());
    Fragments.add(new FragmentSearchSealed_());
    Fragments.add(new Fragment_Username_Search_());
}

@Override
public Fragment getItem(int pos) {
    // TODO Auto-generated method stub
    if(Fragments==null)
    {
        Fragments=new ArrayList<Fragment>();
        Fragments.add(new FragmentBasicSearch_());
        Fragments.add(new FragmentSearchSealed_());
        Fragments.add(new Fragment_Username_Search_());

    }

    if(pos<PAGE_COUNT)
    {
        Log.d("PF", "get pager fragment");
        return Fragments.get(pos);
    }

    return null;
}

@Override
public CharSequence getPageTitle(int position) {
    // TODO Auto-generated method stub
    switch (position)
    {
        case 0:
            return "BASIC SEARCH";

        case 1:
            return "SEALED SECTION SEARCH";

        case 2:
            return "UERNAME SEARCH";

    }
    return super.getPageTitle(position);
}

@Override
public int getCount() {
    // TODO Auto-generated method stub
    return PAGE_COUNT;
}

}

10-01 17:16:33.103: E/AndroidRuntime(3093): FATAL EXCEPTION: main
10-01 17:16:33.103: E/AndroidRuntime(3093): java.lang.IllegalStateException: No activity
10-01 17:16:33.103: E/AndroidRuntime(3093):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1091)
10-01 17:16:33.103: E/AndroidRuntime(3093):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1086)
10-01 17:16:33.103: E/AndroidRuntime(3093):     at android.support.v4.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:1877)
10-01 17:16:33.103: E/AndroidRuntime(3093):     at android.support.v4.app.Fragment.performActivityCreated(Fragment.java:1492)
10-01 17:16:33.103: E/AndroidRuntime(3093):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:947)
10-01 17:16:33.103: E/AndroidRuntime(3093):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
10-01 17:16:33.103: E/AndroidRuntime(3093):     at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
10-01 17:16:33.103: E/AndroidRuntime(3093):     at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1460)
10-01 17:16:33.103: E/AndroidRuntime(3093):     at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:440)
10-01 17:16:33.103: E/AndroidRuntime(3093):     at android.os.Handler.handleCallback(Handler.java:605)
10-01 17:16:33.103: E/AndroidRuntime(3093):     at android.os.Handler.dispatchMessage(Handler.java:92)
10-01 17:16:33.103: E/AndroidRuntime(3093):     at android.os.Looper.loop(Looper.java:137)
10-01 17:16:33.103: E/AndroidRuntime(3093):     at android.app.ActivityThread.main(ActivityThread.java:4441)
10-01 17:16:33.103: E/AndroidRuntime(3093):     at java.lang.reflect.Method.invokeNative(Native Method)
10-01 17:16:33.103: E/AndroidRuntime(3093):     at java.lang.reflect.Method.invoke(Method.java:511)
10-01 17:16:33.103: E/AndroidRuntime(3093):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
10-01 17:16:33.103: E/AndroidRuntime(3093):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:565)
10-01 17:16:33.103: E/AndroidRuntime(3093):     at dalvik.system.NativeStart.main(Native Method)