GetSystemService的详解

    getSystemService是Android很重要的一个API，它是Activity的一个方法，根据传入的NAME来取得对应的Object，然后转换成相应的服务对象。以下介绍系统相应的服务。

           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