Android TabGroupActivity:WindowManager$BadTokenException:无法添加窗口

当我要添加将TabGroupActivity扩展到TabHost的活动时，我的应用程序正在崩溃。代码是Fallowing。当我直接添加主页时，一切正常，但当添加HomePageTabGroup时，应用程序不幸关闭

MainTabHost.java

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

    final TabHost tabHost = getTabHost();
    //tabHost.getTabWidget().setDividerDrawable(R.drawable.tab_divider);


    // Tab for Home
    TabSpec home = tabHost.newTabSpec("Current Jobs");
    // setting Title and Icon for the Tab
    home.setIndicator("Current Jobs",getResources().getDrawable(R.drawable.icon_home_tab));
    Intent homeIntent = new Intent(MainTabHost.this, HomePageTabGroup.class);
    home.setContent(homeIntent);

   // Adding all TabSpec to TabHost
    tabHost.addTab(home); // Adding home tab

    }
}

HomePageTabGroup.java

public class HomePageTabGroup extends TabGroupActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    startChildActivity("HomePage", new Intent(HomePageTabGroup.this, HomePage.class));
    }

}

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我终于得到了答案

在主页上，有一个自定义进度对话框

UmeshCustomProgressHUD.show(HomePage.this,"Loading\nPlease wait!", true,true,this);

一切的发生都是因为这条线。我换了

HomePage.this 

与

其中，ctx在HomePageTabGroup中定义为静态上下文。这两行代码解决了我的问题

HomePageTabGroup.ctx,