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（我是新手，如果我说的有些话没有多大意义，请见谅）

我已经使用 actionbarsherlock 和 Fragments 实现了刷卡。经过测试，我注意到有三个滑动，但只有两个选项卡。我很确定我只创建了两个片段。这几乎就像一个标签以某种方式加倍，我不知道为什么。我已按照此处的一些说明执行此操作。

这是我的主要课程：

public class DashboardActivity extends SherlockFragmentActivity {
    com.actionbarsherlock.app.ActionBar mActionBar;
    ViewPager mPager;
    com.actionbarsherlock.app.ActionBar.Tab tab;

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

        // Activate the navigation mode tabs
        mActionBar = getSupportActionBar();
        mActionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        // Locate the view pager in dashboard.xml
        mPager = (ViewPager) findViewById(R.id.pager);

        // Activate the fragment manager
        FragmentManager fm = getSupportFragmentManager();

        // Capture view pager swipes
        ViewPager.SimpleOnPageChangeListener ViewPagerListener = new ViewPager.SimpleOnPageChangeListener() {
            @Override
            public void onPageSelected(int position) {
                super.onPageSelected(position);
                // Find the view pager position
                mActionBar.setSelectedNavigationItem(position);
            }
        };

        mPager.setOnPageChangeListener(ViewPagerListener);
        // Locate the adapter class
        ViewPagerAdapter viewpageradapter = new ViewPagerAdapter(fm);
        // Set the view pager adapter in ViewPager
        mPager.setAdapter(viewpageradapter);

        // Capture the button clicks API ERROR
        TabListener tabListener = new TabListener() {

            @Override
            public void onTabSelected(
                    com.actionbarsherlock.app.ActionBar.Tab tab,
                    FragmentTransaction ft) {
                // TODO Auto-generated method stub

            }

            @Override
            public void onTabUnselected(
                    com.actionbarsherlock.app.ActionBar.Tab tab,
                    FragmentTransaction ft) {
                mPager.setCurrentItem(tab.getPosition());

            }

            @Override
            public void onTabReselected(
                    com.actionbarsherlock.app.ActionBar.Tab tab,
                    FragmentTransaction ft) {
                // TODO Auto-generated method stub

            }
        };

        // Create the first tab
        tab = mActionBar.newTab().setText("Support Tab")
                .setTabListener(tabListener);
        mActionBar.addTab(tab);

        // Create the second tab
        tab = mActionBar.newTab().setText("Students Tab")
                .setTabListener(tabListener);
        mActionBar.addTab(tab);

    }
}

这是一个片段：（另一个是相同的）

public class StudentsTab extends SherlockListFragment {

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

        String[] studentItems = getResources().getStringArray(
                R.array.studentItems);

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity()
                .getBaseContext(), android.R.layout.simple_list_item_1,
                studentItems);

        setListAdapter(adapter);

        return super.onCreateView(inflater, container, savedInstanceState);
    }
}

这是 ViewPagerAdapter：

公共类 ViewPagerAdapter 扩展 FragmentPagerAdapter {

// Declare the number of tabs
    final int PAGE_COUNT = 2;

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

    @Override
    public Fragment getItem(int arg0) {
        Bundle data = new Bundle();
        switch (arg0) {
        // Open support tab
        case 0:
            SupportTab supportTab = new SupportTab();
            data.putInt("current_page", arg0 + 1);
            supportTab.setArguments(data);
            return supportTab;

        case 1:
            StudentsTab studentTab = new StudentsTab();
            data.putInt("current_page", arg0 + 1);
            studentTab.setArguments(data);
            return studentTab;
        }

        return null;

    }

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

我的主要xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <android.support.v4.view.ViewPager
        android:id="@+id/pager"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >
    </android.support.v4.view.ViewPager>

</RelativeLayout>

如果可以，请帮助，我找不到发生了什么。谢谢！

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