mTabHost = (FragmentTabHost)findViewById(android.R.id.tabhost);
mTabHost.setup(this, getSupportFragmentManager(),
R.id.realtabcontent);

mTabHost.addTab(mTabHost.newTabSpec("tab1").setIndicator("Tab 1"),
Tab1Fragment.class, null);
mTabHost.addTab(mTabHost.newTabSpec("tab2").setIndicator("Tab 2"),
Tab2Fragment.class, null);
mTabHost.addTab(mTabHost.newTabSpec("tab3").setIndicator("Tab 3"),
Tab3Fragment.class, null);