Question

我已经设法在片段中实现ViewPager，在每个选项卡上填充listviews。如果单击其中一个列表视图中的某个项目，则新片段应填满整个屏幕以显示所选项目的一些详细信息。问题是，新片段没有显示任何内容。它只是空洞而且令人沮丧！

VerlaufFragment.java，持有viewPager

public class VerlaufFragment extends Fragment {

public static ViewPager mViewPager;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.viewpager_main, container, false);
        // Locate the ViewPager in viewpager_main.xml
        mViewPager = (ViewPager) view.findViewById(R.id.viewPager);
        // Set the ViewPagerAdapter into ViewPager
        mViewPager.setAdapter(new ViewPagerAdapter(getChildFragmentManager()));
        mViewPager.setCurrentItem(3);
        return view;
    }

public class ViewPagerAdapter extends FragmentPagerAdapter {

    // Declare the number of ViewPager pages
    final int PAGE_COUNT = 7;
    private String titles[] = new String[] { "Tab1", "Tab2" , "Tab3" , "Tab4" ,        "Tab5" , "Tab6" , "Tab7" };

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

    @Override
    public Fragment getItem(int position) {
        switch (position) {
            // Open FragmentTab1
        case 0:
            UebungenMainFragment fragmenttab1 = new UebungenMainFragment();
            return fragmenttab1;
            // Open FragmentTab2
        case 1:
            UebungenMainFragment fragmenttab2 = new UebungenMainFragment();
            return fragmenttab2;
            //Open FragmentTab3
        default:
            UebungenMainFragment fragmenttab3 = new UebungenMainFragment();
            return fragmenttab3;
        }
    }

    public CharSequence getPageTitle(int position) {
        return titles[position];
    }

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

}

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

}

UebungenMainFragment.java包含所有Listviews

public class UebungenMainFragment extends ListFragment {

  @Override
  public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    String[] values = new String[] { "Item", "Item", "Item",
    "Item", "Item", "Item", "Item", "Item",
    "Item", "Item", "Item", "Item", "Item", "Item"};
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(),
    android.R.layout.simple_list_item_1, values);
    setListAdapter(adapter);
  }

  @Override
  public void onListItemClick(ListView l, View v, int position, long id) {
  FragmentTransaction transaction = getFragmentManager().beginTransaction();
  transaction.replace(((ViewGroup) getView().getParent()).getId(), new UebungDetailedFragment());
  transaction.addToBackStack(null);
  transaction.commit();
  }
}

最后是UebungDetailedFragment.java，其中包含项目的详细信息

public class UebungDetailedFragment extends Fragment{
    TextView tvItemName;

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

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

    tvItemName = (TextView) view.findViewById(R.id.frag1_text);

    tvItemName.setText("HELLO WORLD");
    return view;
}
}

xml文件：

fragment_main.xml

<?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"
  >

  <TextView
    android:id="@+id/frag1_text"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="10dp"
    android:textAppearance="?android:attr/textAppearanceLarge" />
</LinearLayout>

如果我点击其中一个项目，标签仍然可见，列表视图已消失，但我的＆＃34; HELLO WORLD＆＃34;没有出现。如果我留在这＆＃34;空＆＃34;查看和滑动视野，我仍然可以在列表视图之间滑动，我也不想要。有什么想法使它有效吗？

ViewPager中的Listview问题

0 个答案: