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android的後台運行在很多service，它們在系統啟動時被SystemServer開啟，支援系統的正常工作，比如MountService監 聽是否有SD卡安裝及移除，ClipboardService提供剪下板功能，PackageManagerService提供軟體包的安裝移除及查看等 等，應用程式可以通過系統提供的Manager介面來訪問這些Service提供的資料。 getSystemService是Android很重要的一個API，它是Activity的一個方法，根據傳入的NAME來取得對應的Object，然後轉換成相應的服務物件。以下介紹系統相應的服務。 傳入的Name | 返回的對象 | 說明
- WINDOW_SERVICE WindowManager 管理開啟的視窗程序
- LAYOUT_INFLATER_SERVICE LayoutInflater 取得xml裡定義的view
- ACTIVITY_SERVICE ActivityManager 管理應用程式的系統狀態
- POWER_SERVICE PowerManger 電源的服務
- ALARM_SERVICE AlarmManager 鬧鐘的服務
- NOTIFICATION_SERVICE NotificationManager 狀態列的服務
- KEYGUARD_SERVICE KeyguardManager 鍵盤鎖的服務
- LOCATION_SERVICE LocationManager 位置的服務，如GPS
- SEARCH_SERVICE SearchManager 搜尋的服務
- VEBRATOR_SERVICE Vebrator 手機震動的服務
- CONNECTIVITY_SERVICE Connectivity 網路連接的服務
- WIFI_SERVICE WifiManager Wi-Fi服務
- TELEPHONY_SERVICE TeleponyManager 電話語音
Currently available names are:
- WINDOW_SERVICE ("window")
The top-level window manager in which you can place custom windows.The returned object is a WindowManager.
- LAYOUT_INFLATER_SERVICE ("layout_inflater")
A LayoutInflater for inflating layout resources in thiscontext.
- ACTIVITY_SERVICE ("activity")
A ActivityManager for interacting with the global activity state ofthe system.
- POWER_SERVICE ("power")
A PowerManager for controlling powermanagement.
- ALARM_SERVICE ("alarm")
A AlarmManager for receiving intents at the time of yourchoosing.
- NOTIFICATION_SERVICE ("notification")
A NotificationManager for informing the user of backgroundevents.
- KEYGUARD_SERVICE ("keyguard")
A KeyguardManager for controlling keyguard.
- LOCATION_SERVICE ("location")
A LocationManager for controlling location (e.g., GPS)updates.
- SEARCH_SERVICE ("search")
A SearchManager for handling search.
- VIBRATOR_SERVICE ("vibrator")
A Vibrator for interacting with the vibratorhardware.
- CONNECTIVITY_SERVICE ("connection")
A ConnectivityManager for handling management of networkconnections.
- WIFI_SERVICE ("wifi")
A WifiManager for management of Wi-Ficonnectivity.
- INPUT_METHOD_SERVICE ("input_method")
An InputMethodManager for management of inputmethods.
- UI_MODE_SERVICE ("uimode")
An UiModeManager for controlling UI modes.
- DOWNLOAD_SERVICE ("download")
A DownloadManager for requesting HTTP downloads
Note: System services obtained via this API may be closelyassociated with the Context in which they are obtained from. Ingeneral, do not share the service objects between various differentcontexts (Activities, Applications, Services, Providers,etc.)
一個例子：
在android 擷取手機資訊的時候用到這樣一段代碼：
public class BasicInfo {
public StringgetPhoneNumber()
{
//擷取手機號 MSISDN，很可能為空白
TelephonyManager tm =(TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
StringBufferinf = new StringBuffer();
switch(tm.getSimState()){//getSimState()取得sim的狀態 有下面6中狀態
caseTelephonyManager.SIM_STATE_ABSENT :inf.append("無卡");returninf.toString();
caseTelephonyManager.SIM_STATE_UNKNOWN :inf.append("未知狀態");returninf.toString();
caseTelephonyManager.SIM_STATE_NETWORK_LOCKED:inf.append("需要NetworkPIN解鎖");return inf.toString();
caseTelephonyManager.SIM_STATE_PIN_REQUIRED:inf.append("需要PIN解鎖");return inf.toString();
caseTelephonyManager.SIM_STATE_PUK_REQUIRED:inf.append("需要PUK解鎖");return inf.toString();
caseTelephonyManager.SIM_STATE_READY :break;
}
String phoneNumber =tm.getLine1Number();
returnphoneNumber;
}
在另外一個activity類裡面調用的時候 總是出現進程關閉 無法擷取手機資訊。後來發現
getSystemService這個方法基於context,只有存在TextView控制項的表單中這個方法才會被啟用~
|
於是：
1. 給BasicInfo添加一個帶參數Context的建構函式：
public BasicInfo (Context context)
{
this.context =context;
}
2. getPhoneNumber()函數裡面改成：
context.getSystemService(Context.TELEPHONY_SERVIC);
3. 在調用類裡面 BasicInfo bi = newBasicInfo(this);
bi.getPhoneNumber();
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android中getSystemService詳解
