用ActionBar的TABS模式，和Fragment实现程序顶部的标签页切换。
一. MainActivity
public class MainActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 取得ActionBar，设置为Tab模式
ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// 新建2个Tab
ActionBar.Tab tabA = actionBar.newTab().setText("TabA");
ActionBar.Tab tabB = actionBar.newTab().setText("TabB");
// 绑定到Fragment
Fragment fragmentA = new FragmentA();
Fragment fragmentB = new FragmentB();
tabA.setTabListener(new MyTabsListener(fragmentA));
tabB.setTabListener(new MyTabsListener(fragmentB));
actionBar.addTab(tabA);
actionBar.addTab(tabB);
}
// 监听器类
protected class MyTabsListener implements ActionBar.TabListener {
private Fragment fragment;
public MyTabsListener(Fragment fragment) {
this.fragment = fragment;
}
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
// FragmentTransaction 的 replace() 方法切换显示的Fragment
ft.replace(R.id.fragment_place, fragment, null);
}
@Override
public void onTabReselected(Tab arg0, FragmentTransaction arg1) {
// TODO Auto-generated method stub
}
@Override
public void onTabUnselected(Tab arg0, FragmentTransaction arg1) {
// TODO Auto-generated method stub
}
}
}
二. FragmentA.class 与 FragmentB.class
public class FragmentB extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_b, container, false);
}
}
三. activity_main.xml
要显示切换Fragment的地方：
<LinearLayout
android:id="@+id/fragment_place"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
</LinearLayout>
四. fragment_a.xml 与 fragment_b.xml
五. 备注：一个在Fragment中getSystemService()的方法
新建一个MyApplication类（或使用其它已有Activity）
public class MyApplication extends Application {
private static MyApplication instance;
@Override
public void onCreate() {
// TODO Auto-generated method stub
super.onCreate();
instance = this;
}
public static MyApplication getInstance() {
// TODO Auto-generated method stub
return instance;
}
}
需要使用android的系统服务的时候，使用：
Myapplication.getinstance().getsystemservice()