Android Tab操作栏

| 我正在尝试在Android操作栏上针对3.0进行操作 http://www.youtube.com/watch?v=gMu8XhxUBl8
TabsActivity
中的代码如下:
package com.test.actionbar;

import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.Activity;
import android.app.Fragment; 
import android.app.FragmentTransaction;
import android.os.Bundle;

public class TabsActivity extends Activity{

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    ActionBar bar = getActionBar();
    bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
    ActionBar.Tab tabA = bar.newTab().setText(\"A Tab\");
    ActionBar.Tab tabB = bar.newTab().setText(\"B Tab\");
    ActionBar.Tab tabC = bar.newTab().setText(\"C Tab\");

    Fragment fragmentA = new AFragmentTab();
    Fragment fragmentB = new BFragmentTab();
    Fragment fragmentC = new CFragmentTab();

    tabA.setTabListener(new MyTabsListener(fragmentA));
    tabB.setTabListener(new MyTabsListener(fragmentB));
    tabC.setTabListener(new MyTabsListener(fragmentC));

    bar.addTab(tabA);
    bar.addTab(tabB);
    bar.addTab(tabC);

}

protected class MyTabsListener implements ActionBar.TabListener {

    private Fragment fragment;

    public MyTabsListener(Fragment fragment) {
        this.fragment = fragment;
    }

    public void onTabReselected(Tab tab, FragmentTransaction ft) {
        // TODO Auto-generated method stub

    }

    public void onTabSelected(Tab tab, FragmentTransaction ft) {
        // TODO Auto-generated method stub
        ft.add(R.id.fragment_container, fragment, null);

    }

    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
        // TODO Auto-generated method stub

    }
  }
}
对于逐步教程,但是,在完成本教程之后,我意识到在TabsActivity的onTabSelected方法中,它将需要一个变量,即container_id,我不太确定该如何提供,即使在查找之后在api。我尝试删除该行并在平板电脑上运行它,但它抛出了runtimeexception。 谁能帮我这个? 抱歉,如果问题听起来太简单,我是android编程的新手。 提前致谢。 编辑
import android.app.ActionBar;
import android.app.Activity;
import android.app.Fragment;
import android.os.Bundle;

public class ActionBarTabs extends Activity {

public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    ActionBar bar = getActionBar();
    bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
    ActionBar.Tab tabA = bar.newTab().setText(\"A Tab\");
    ActionBar.Tab tabB = bar.newTab().setText(\"B Tab\");
    ActionBar.Tab tabC = bar.newTab().setText(\"C Tab\");

    bar.addTab(tabA);
    bar.addTab(tabB);
    bar.addTab(tabC);
  }
}
更新
package com.debug.actionbartabs;

import android.app.ActionBar;
import android.app.Activity;
import android.os.Bundle;

public class TabsActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    ActionBar bar = getActionBar();
    bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
    ActionBar.Tab tabA = bar.newTab().setText(\"A Tab\");
   bar.addTab(tabA);

   }
}
    
已邀请:
        每个类应如下所示:
public class AFragmentTab extends Fragment
{
  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
  {
    return inflater.inflate(R.layout.fragment_a, container, false);
  }
}
主要活动应如下所示:
package com.test.actionbar;

import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.Activity;
import android.app.Fragment; 
import android.app.FragmentTransaction;
import android.os.Bundle;

public class TabsActivity extends Activity{

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    ActionBar bar = getActionBar();
    bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
    ActionBar.Tab tabA = bar.newTab().setText(\"A Tab\");
    ActionBar.Tab tabB = bar.newTab().setText(\"B Tab\");
    ActionBar.Tab tabC = bar.newTab().setText(\"C Tab\");

    Fragment fragmentA = new AFragmentTab();
    Fragment fragmentB = new BFragmentTab();
    Fragment fragmentC = new CFragmentTab();

    tabA.setTabListener(new MyTabsListener(fragmentA));
    tabB.setTabListener(new MyTabsListener(fragmentB));
    tabC.setTabListener(new MyTabsListener(fragmentC));

    bar.addTab(tabA);
    bar.addTab(tabB);
    bar.addTab(tabC);

}

protected class MyTabsListener implements ActionBar.TabListener {

    private Fragment fragment;

    public MyTabsListener(Fragment fragment) {
        this.fragment = fragment;
    }

    public void onTabReselected(Tab tab, FragmentTransaction ft) {
    }

    public void onTabSelected(Tab tab, FragmentTransaction ft) {
        ft.add(R.id.fragment_container, fragment, null);
    }

    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
        // some people needed this line as well to make it work: 
        ft.remove(fragment);
    }
}
我刚刚在这里找到他的代码的副本:http://www.abelski.com/courses/android3ui/actionbar.pdf> _ < 所以在main.xml中看起来像这样:
<?xml version=\"1.0\" encoding=\"utf-8\"?>
<LinearLayout
xmlns:android=\"http://schemas.android.com/apk/res/android\"
android:orientation=\"vertical\"
android:layout_width=\"fill_parent\"
android:layout_height=\"fill_parent\"
>
<LinearLayout android:layout_height=\"wrap_content\"
android:layout_width=\"match_parent\"
android:id=\"@+id/fragment_container\"></LinearLayout>
</LinearLayout>
    

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