查看寻呼机显示3个标签中的2个，中间显示未显示Android

Question

我有3个标签，3个与标签相关联的列表视图片段，其中2个正在处理第1个和第3个，但是如果我将其位置设置为0，则中间的一个没有显示并且它不是空的b / c ，它会显示..这很奇怪...我想知道是否有人经历过这个以及它的android bug ...给我一些建议。感谢。

以下是一些代码：

这是活动布局：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/assign"
android:layout_height="match_parent">

<include
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    layout="@layout/navbar_layout"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_alignParentBottom="true" />

<android.support.v4.view.ViewPager   xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/tabspager"
    android:layout_width="match_parent"
    app:tabTextColor="@color/colorPrimaryDark"
    android:layout_height="460dp">
 </android.support.v4.view.ViewPager>

 </RelativeLayout>

这是主要活动：

  public class main_activity extends AppCompatActivity implements  
  android.support.v7.app.ActionBar.TabListener{

  private ViewPager tabsviewPager;
  private ActionBar mActionBar;
 private TabsAdapter mTabsAdapter;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.main_layout);

 tabsviewPager = (ViewPager) findViewById(R.id.tabspager);

 mTabsAdapter = new TabsAdapter(getSupportFragmentManager());

 tabsviewPager.setAdapter(mTabsAdapter);

getSupportActionBar().setHomeButtonEnabled(false);
getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

  ActionBar.Tab onestab = 
  getSupportActionBar().newTab().setText("one").setTabListener(this);
  ActionBar.Tab twotab = 
  getSupportActionBar().newTab().setText("two").setTabListener(this);
  ActionBar.Tab threetab = 
  getSupportActionBar().newTab().setText("three").setTabListener(this);

  getSupportActionBar().addTab(onestab);
  getSupportActionBar().addTab(twotab);
 getSupportActionBar().addTab(threetab);


//This helps in providing swiping effect for v7 compat library
tabsviewPager.setOnPageChangeListener(new 
 ViewPager.OnPageChangeListener() {

    @Override
    public void onPageSelected(int position) {
        // TODO Auto-generated method stub
        getSupportActionBar().setSelectedNavigationItem(position);
    }

    @Override
    public void onPageScrolled(int arg0, float arg1, int arg2) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onPageScrollStateChanged(int arg0) {
        // TODO Auto-generated method stub

    }
});


}

 @Override
 public void onTabReselected(ActionBar.Tab arg0, FragmentTransaction arg1) {
  // TODO Auto-generated method stub

}

  @Override
 public void onTabSelected(ActionBar.Tab selectedtab,
  FragmentTransaction arg1) {
  // TODO Auto-generated method stub
  tabsviewPager.setCurrentItem(selectedtab.getPosition()); 
 }

 @Override
 public void onTabUnselected(ActionBar.Tab arg0, FragmentTransaction arg1) {
  // TODO Auto-generated method stub

  }

这是标签适配器：

  public class TabsAdapter extends FragmentStatePagerAdapter {

  private int TOTAL_TABS = 3;

 public TabsAdapter(FragmentManager fm) {
  super(fm);
  // TODO Auto-generated constructor stub
}

@Override
public Fragment getItem(int index) {
// TODO Auto-generated method stub
switch (index) {
    case 0:
        return new oneFragment();

    case 1:
        return new twoFragment();

    case 2:
        return new threeFragment();
  }

 return null;
 }

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

这是我设置它的片段，以便它可以在选择时显示列表视图：

 public class twoFragment extends Fragment {

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


     View view = inflater.inflate(R.layout.two_parent,   container, false);

     ListView View = (ListView) view.findViewById(R.id.testingView2);
     assignDB assignDB = new assignDB(getContext());
     List<TWO> assignData = assignDB.getAll();
     two_adapter adapter = new   two_adapter(getContext(), assignData);
    View.setAdapter(adapter);

     return view;
    }

   }