Java Android片段列表视图

我有一个片段，其中有一个列表视图这是我的布局：

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <ListView
        android:id="@+id/list"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="2dip"
        android:drawSelectorOnTop="false"
        android:visibility="visible" />

</FrameLayout>

我有一个片段和一个活动。我想显示标记片段的名称，但不想在actionBar中显示应用程序的名称：这是我的活动：当我删除ActionBarActivity时，我不能使用FragmentManager

public class ObjectListActivity extends ActionBarActivity implements android.support.v7.app.ActionBar.TabListener  {

    private ViewPager viewPager;
    private android.support.v7.app.ActionBar actionBar;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_object_list2);

        // View pager for showing many fragments over a single activity
        viewPager = (ViewPager) findViewById(R.id.pager);

        // Getting fragment manager to control fragments
        FragmentManager fragmnetManager = getSupportFragmentManager();

        // Setting adapter over view pager
        viewPager.setAdapter(new MyAdapter(fragmnetManager));

        // Implementing view pager pagechangelistener to navigate between tabs
        viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

            @Override
            public void onPageSelected(int pos) {

                // Setting navigation of tabs to actionbar
                actionBar.setSelectedNavigationItem(pos);
            }

            @Override
            public void onPageScrolled(int arg0, float arg1, int arg2) {

            }

            @Override
            public void onPageScrollStateChanged(int arg0) {

            }
        });

        // Getting actionbar
        actionBar = getSupportActionBar();

        // Setting navigation mode to actionbar
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        // Now adding a new tab to action bar and setting title, icon and
        // implementing listener
        android.support.v7.app.ActionBar.Tab tab1 = actionBar.newTab();
        tab1.setText("Wszytskie");
        // tab1.setIcon(R.drawable.ic_launcher);
        tab1.setTabListener(this);

        android.support.v7.app.ActionBar.Tab tab2 = actionBar.newTab();
        tab2.setText("Grupy");
        tab2.setTabListener(this);

        // Now finally adding all tabs to actionbar
        actionBar.addTab(tab1);
        actionBar.addTab(tab2);

    }

    @Override
    public void onTabReselected(android.support.v7.app.ActionBar.Tab arg0,
                                FragmentTransaction arg1) {

    }

    @Override
    public void onTabSelected(android.support.v7.app.ActionBar.Tab tab,
                              FragmentTransaction arg1) {

        // Setting current position of tab to view pager
        viewPager.setCurrentItem(tab.getPosition());
    }

    @Override
    public void onTabUnselected(android.support.v7.app.ActionBar.Tab arg0,
                                FragmentTransaction arg1) {

    }
}

class MyAdapter extends FragmentPagerAdapter {
    public MyAdapter(FragmentManager fm) {
        super(fm);

    }

    @Override
    public Fragment getItem(int i) {

        // Getting fragments according to selected position
        Fragment fragment = null;
        if (i == 0) {
            fragment = new FragmentAllObjectActivity();
        }
        if (i == 1) {
            fragment = new FragmentGroupObjectsActivity();
        }

        // and finally returning fragments
        return fragment;
    }

    @Override
    public int getCount() {

        // Returning no. of counts of fragments
        return 2;
    }
} 

---

在适配器的getView方法中返回null

将其更改为返回视图对象

要删除actionbar，请使用：

// Getting actionbar
    actionBar = getSupportActionBar();
    actionBar.hide();  //add this

---

现在我在Adapter.AllObjectAdapter.getViewAllObjectAdapter.java中得到了一个.NullPointerException，在这一行中是：holder.name.setTextrowBean.getTitle；如果是这样的话，有时可能会在某些行中运行检查您的rowBean在rowBean.getTitle之前是否为null？好的，谢谢，我编辑了我的帖子我想删除一个带有名称的操作栏应用程序，但我想看到标记的名称。我在操作栏中没有标记的名称

public class ObjectListActivity extends ActionBarActivity implements android.support.v7.app.ActionBar.TabListener  {

    private ViewPager viewPager;
    private android.support.v7.app.ActionBar actionBar;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_object_list2);

        // View pager for showing many fragments over a single activity
        viewPager = (ViewPager) findViewById(R.id.pager);

        // Getting fragment manager to control fragments
        FragmentManager fragmnetManager = getSupportFragmentManager();

        // Setting adapter over view pager
        viewPager.setAdapter(new MyAdapter(fragmnetManager));

        // Implementing view pager pagechangelistener to navigate between tabs
        viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

            @Override
            public void onPageSelected(int pos) {

                // Setting navigation of tabs to actionbar
                actionBar.setSelectedNavigationItem(pos);
            }

            @Override
            public void onPageScrolled(int arg0, float arg1, int arg2) {

            }

            @Override
            public void onPageScrollStateChanged(int arg0) {

            }
        });

        // Getting actionbar
        actionBar = getSupportActionBar();

        // Setting navigation mode to actionbar
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        // Now adding a new tab to action bar and setting title, icon and
        // implementing listener
        android.support.v7.app.ActionBar.Tab tab1 = actionBar.newTab();
        tab1.setText("Wszytskie");
        // tab1.setIcon(R.drawable.ic_launcher);
        tab1.setTabListener(this);

        android.support.v7.app.ActionBar.Tab tab2 = actionBar.newTab();
        tab2.setText("Grupy");
        tab2.setTabListener(this);

        // Now finally adding all tabs to actionbar
        actionBar.addTab(tab1);
        actionBar.addTab(tab2);

    }

    @Override
    public void onTabReselected(android.support.v7.app.ActionBar.Tab arg0,
                                FragmentTransaction arg1) {

    }

    @Override
    public void onTabSelected(android.support.v7.app.ActionBar.Tab tab,
                              FragmentTransaction arg1) {

        // Setting current position of tab to view pager
        viewPager.setCurrentItem(tab.getPosition());
    }

    @Override
    public void onTabUnselected(android.support.v7.app.ActionBar.Tab arg0,
                                FragmentTransaction arg1) {

    }
}

class MyAdapter extends FragmentPagerAdapter {
    public MyAdapter(FragmentManager fm) {
        super(fm);

    }

    @Override
    public Fragment getItem(int i) {

        // Getting fragments according to selected position
        Fragment fragment = null;
        if (i == 0) {
            fragment = new FragmentAllObjectActivity();
        }
        if (i == 1) {
            fragment = new FragmentGroupObjectsActivity();
        }

        // and finally returning fragments
        return fragment;
    }

    @Override
    public int getCount() {

        // Returning no. of counts of fragments
        return 2;
    }
} 

@Override
public View getView(int position, View view, ViewGroup parent) {

    final ViewHolder holder;
    RowBean rowBean = data[position];

    if(view == null){
        holder = new ViewHolder();
        view = inflater.inflate(R.layout.all_object_holder, null);
        holder.name = (TextView) view.findViewById(R.id.showText);
        holder.checkBox = (CheckBox) view.findViewById(R.id.checkBox1);
    }else {
        holder = (ViewHolder) view.getTag();
    }
    holder.name.setText(rowBean.getTitle());

    return view;  //change here
}

// Getting actionbar
    actionBar = getSupportActionBar();
    actionBar.hide();  //add this