ActivityGroup，我得到ActivityNotFoundException哪里错了？

Question

我的应用包含包含5个标签的tabhost，为了防止在进行其他活动时消失标签，我使用了活动组。但我无法在我的一些标签中获得至少OnCreate（），该标签在调试模式的结果中扩展了ActivityGroup。

问题出在哪里？

这是代码

tabMain.java

package com.example.myproject;
import android.app.Activity;
import android.os.Handler;
import android.widget.TextView;
import android.content.Intent;
import android.os.Bundle;
import android.os.Message;
import android.widget.TabHost;
import android.app.TabActivity;
import android.content.Intent;
import android.app.ActivityGroup;
import android.app.LocalActivityManager;

public class TpvolMainTap extends ActivityGroup {

@Override
public void onPause() { 
    overridePendingTransition(R.anim.slide_in_left, R.anim.slide_out_right); 
    super.onPause(); 
} 


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.tpvol_main_tap);
    final TabHost tabHost = (TabHost)findViewById(R.id.tabhost);


    tabHost.setup(getLocalActivityManager());
    Intent intent;
    TabHost.TabSpec spec;

    tabHost.addTab(tabHost.newTabSpec("Tab00").setIndicator("firsttab")
            .setContent(new Intent(this, TabHostNotification.class)));
    //here comes to exception.(ActivityNotFoudn) I can't get at least OnCreate() 
    //in TabHostNotification class


    intent = new Intent(this, MemberActivity.class);
    spec = tabHost.newTabSpec("Tab01").setIndicator("secondtab")
            .setContent(intent);
    tabHost.addTab(spec);

    intent = new Intent(this, VolunteerActivity.class);
    spec = tabHost.newTabSpec("Tab02").setIndicator("thirdtab")
            .setContent(intent);
    tabHost.addTab(spec);



    intent = new Intent(this, AlbumActivity.class);
    spec = tabHost.newTabSpec("Tab03").setIndicator("forthtab")
            .setContent(intent);
    tabHost.addTab(spec);

    intent = new Intent(this, EtcActivity.class);
    spec = tabHost.newTabSpec("Tab04").setIndicator("fifthtab")
            .setContent(intent);
    tabHost.addTab(spec);

    tabHost.setCurrentTab(0);

}

}

TabHostNotification.java

package com.example.tpvol;

import android.app.ActivityGroup;
import java.util.ArrayList;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;

public class TabHostNotification extends ActivityGroup {

 public static TabHostNotification notificationGroup;

  private ArrayList<View> history;

  @Override //exception take place before this function
  public void onCreate(Bundle savedInstanceState) {        
         super.onCreate(savedInstanceState);
   history = new ArrayList<View>();
   notificationGroup = this;

   Intent intent = new Intent(this, NotificationActivity.class);
   View view = getLocalActivityManager().startActivity("firttab", intent
           .addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)).getDecorView();
   replaceView(view);
  }

  public void replaceView(View view) {
   history.add(view);
   setContentView(view);
  }

  public void back() {
   if(history.size() > 0) {
    history.remove(history.size()-1);
    if(history.size() ==  0)
     finish();
    else 
    setContentView(history.get(history.size()-1));
   } 
  else
   {
    finish();
   }
  }

  @Override
  public void onBackPressed() {
      notificationGroup.back();
   return ;
  }

}