FragmentTabHost，嵌套片段和ViewPager

我有一個活動，其利用一個FragmentTabHost的，因此，每個標籤都有它裏面的片段。在第一個標籤中，我有兩個嵌套片段，一個在屏幕的上半部分，另一個在下半部分。底部的片段使用ViewPager掃描幾個LinearLayouts。這一切都很好。FragmentTabHost，嵌套片段和ViewPager

直到您移到另一個選項卡並返回第一個。底部的嵌套片段不再出現，但頂部的嵌套片段不會。

下面是一些代碼展示了我的用法：

這是我如何用我的主要活動：

public class MainActivity extends SherlockFragmentActivity 
{ 
    private FragmentTabHost mTabHost; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) 
    { 
     super.onCreate(savedInstanceState); 

     setContentView(R.layout.main_activity_layout_vert); 

     mTabHost = (FragmentTabHost)findViewById(android.R.id.tabhost); 
     mTabHost.setup(this, getSupportFragmentManager(), R.id.realtabcontent); 

     mTabHost.addTab(mTabHost.newTabSpec("TAB1").setIndicator("", getResources().getDrawable(R.drawable.tab1_selector)), Tab1Fragment.class, null); 
     mTabHost.addTab(mTabHost.newTabSpec("TAB2").setIndicator("", getResources().getDrawable(R.drawable.tab2_selector)), Tab2Fragment.class, null); 
    } 
}

這裏是我如何使用片段爲TAB1：

public class Tab1Fragment extends SherlockFragment 
{ 
    private NestedFragment1 mNestedFrag1 = null; 
    private NestedFragment2 mNestedFrag2 = null; 


    @Override 
    public void onCreate(Bundle inSavedInstanceState) 
    { 
     super.onCreate(inSavedInstanceState); 

     mNestedFrag1 = new NestedFragment1(); 
     mNestedFrag2 = new NestedFragment2(); 

     FragmentManager fragManager = getChildFragmentManager(); 
     FragmentTransaction fragTransaction = fragManager.beginTransaction(); 

     fragTransaction.add(R.id.nested_frag1_container, mNestedFrag1, "Frag1"); 
     fragTransaction.add(R.id.nested_frag2_container, mNestedFrag2, "Frag2"); 
     fragTransaction.commit(); 
    } 

    @Override 
    public void onDestroy() 
    { 
     FragmentManager fragManager = getChildFragmentManager(); 
     FragmentTransaction fragTransaction = fragManager.beginTransaction(); 

     fragTransaction.remove(mNestedFrag1); 
     fragTransaction.remove(mNestedFrag2); 
     fragTransaction.commit(); 
    } 
}

這裏是我如何使用第二嵌套片段（即消失的一個）：

public class NestedFragment2 extends SherlockFragment 
{ 
    private MyPageAdapter mPageAdapter; 
    private ViewPager mViewPager; 

    @Override 
    public void onCreate(Bundle inSavedInstanceState) 
    { 
     super.onCreate(inSavedInstanceState); 

     mPageAdapter = new MyPageAdapter(); 
    } 

    @Override 
    public void onDestroy() 
    { 
     super.onDestroy(); 
    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) 
    { 
     View toReturn = inflater.inflate(R.layout.nested_fragment1_layout_top, container, false); 

     mViewPager = (ViewPager)toReturn.findViewById(R.id.viewpager); 
     mViewPager.setAdapter(mPageAdapter); 
     mViewPager.setOffscreenPageLimit(5); 

     return toReturn; 
    } 

    private class MyPageAdapter extends PagerAdapter 
    { 
     @Override 
     public Object instantiateItem(ViewGroup container, int position) 
     {   
      View page = getActivity().getLayoutInflater().inflate(R.layout.view_pager_controls_layout, container, false); 

      container.addView(page); 

      return page; 
     } 

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

     @Override 
     public int getCount() 
     { 
      return 5; 
     } 

     @Override 
     public float getPageWidth(int position) 
     { 
      return 1; 
     } 

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

想法？

來源

2013-06-19 KairisCharm