tabhost的继承与不继承tabactivity

第一种：继承TabActivity public class Main extends TabActivity {
TabHost tabhost;
@Override
public void onCreate(Bundle savedInstanceState) 	{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tabhost = (TabHost) findViewById(android.R.id.tabhost);	or：		tabhost = getTabHost();		tabhost.setup();         }}
第二种：继承ActivityGroup
public class Main extends ActivityGroup {
TabHost tabhost;
@Override
public void onCreate(Bundle savedInstanceState) 	{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tabhost = (TabHost) findViewById(android.R.id.tabhost);
tabhost.setup(getLocalActivityManager());       }}
第三种：继承Activity public class Main extends Activity {	TabHost tabhost; 	@Override
public void onCreate(Bundle savedInstanceState) 	{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
LocalActivityManager activityGroup = new LocalActivityManager(this,true);
tabhost = (TabHost) findViewById(android.R.id.tabhost); 		activityGroup.dispatchCreate(savedInstanceState);
tabhost.setup(activityGroup);
TabHost.TabSpec spec = tabhost.newTabSpec("tag1");
spec.setContent(new Intent(this, Test.class));
spec.setIndicator("第一个选项卡",getResources().getDrawable(R.drawable.ic_launcher));
tabhost.addTab(spec);
}
}