android中比较重要的API:getSystemService

 
传入的Name         |         返回的对象            |                  说明
WINDOW_SERVICE                      WindowManager                   管理打开的窗口程序
LAYOUT_INFLATER_SERVICE             LayoutInflater                   取得xml里定义的view
ACTIVITY_SERVICE                    ActivityManager                  管理应用程序的系统状态
POWER_SERVICE                       PowerManger                      电源的服务
ALARM_SERVICE                       AlarmManager                     闹钟的服务
NOTIFICATION_SERVICE                NotificationManager              状态栏的服务
KEYGUARD_SERVICE                    KeyguardManager                 键盘锁的服务
LOCATION_SERVICE                    LocationManager                  位置的服务，如GPS
SEARCH_SERVICE                      SearchManager                   搜索的服务
VEBRATOR_SERVICE                    Vebrator                         手机震动的服务
CONNECTIVITY_SERVICE                Connectivity                     网络连接的服务
WIFI_SERVICE                        WifiManager                      Wi-Fi服务
TELEPHONY_SERVICE                   TeleponyManager                 电话服务