android tabhost布局问题

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android tabhost布局问题0

main.xml:
<?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:orientation="horizontal"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_margin="4sp"
    >
    <ImageView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="xxxx"
    />
    其他空间
</LinearLayout>

<TabHost
android:id="@+id/tabhost"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TabWidget
android:id="@android:id/tabs"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<Button
android:id="@+id/btn"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Button" />
</FrameLayout>
</LinearLayout>
</TabHost>

<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:textStyle="bold"
android:textSize="20sp"
android:text="xxxxxx"
/>
</LinearLayout>

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

//        TabHost tabHost = (TabHost)findViewById(R.id.tabhost);
//        tabHost.setup();
//        tabHost.setup(getLocalActivityManager());
//        tabHost.addTab(tabHost.newTabSpec("123").setIndicator("main").setContent(new Intent(this, TabHostDemoActivity.class)));
//        tabHost.addTab(tabHost.newTabSpec("1234").setIndicator("main2").setContent(new Intent(this, TabHostDemoActivity.class)));

    }
}

这样可以显示但是没有tab
把注释去掉后,就会报错了.

现在我想通过程序往tabhost里添加tab,应该怎么做?