标签：android des blog http strong os
http://blog.sina.com.cn/s/blog_71d1e4fc0100o8qr.html
http://blog.csdn.net/bianhaohui/article/details/6220135
android的后台运行在很多service，它们在系统启动时被SystemServer开启，支持系统的正常工作，比如MountService监听是否有SD卡安装及移除，ClipboardService提供剪切板功能，PackageManagerService提供软件包的安装移除及查看等等，应用程序可以通过系统提供的Manager接口来访问这些Service提供的数据。
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
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 this context.
- ACTIVITY_SERVICE ("activity")
A ActivityManager for interacting with the
global activity state of the system.
- POWER_SERVICE ("power")
A PowerManager for controlling power
management.
- ALARM_SERVICE ("alarm")
A AlarmManager for receiving intents at the time
of your choosing.
- NOTIFICATION_SERVICE ("notification")
A NotificationManager for informing
the user of background events.
- 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
vibrator hardware.
- CONNECTIVITY_SERVICE ("connection")
A ConnectivityManager for handling
management of network connections.
- WIFI_SERVICE ("wifi")
A WifiManager for management of Wi-Fi
connectivity.
- INPUT_METHOD_SERVICE ("input_method")
An InputMethodManager for
management of input methods.
- 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 closely associated with
the Context in which they are obtained from. In general, do not share the
service objects between various different contexts (Activities, Applications,
Services, Providers, etc.)
一个例子：
在android
获取手机信息的时候用到这样一段代码：
public class BasicInfo {
public String getPhoneNumber()
{
// 获取手机号
MSISDN，很可能为空
TelephonyManager tm =
(TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
StringBuffer inf = new
StringBuffer();
switch(tm.getSimState()){
//getSimState()取得sim的状态 有下面6中状态
case
TelephonyManager.SIM_STATE_ABSENT :inf.append("无卡");return inf.toString();
case
TelephonyManager.SIM_STATE_UNKNOWN :inf.append("未知状态");return
inf.toString();
case
TelephonyManager.SIM_STATE_NETWORK_LOCKED :inf.append("需要NetworkPIN解锁");return
inf.toString();
case
TelephonyManager.SIM_STATE_PIN_REQUIRED :inf.append("需要PIN解锁");return
inf.toString();
case
TelephonyManager.SIM_STATE_PUK_REQUIRED :inf.append("需要PUK解锁");return
inf.toString();
case
TelephonyManager.SIM_STATE_READY :break;
}
String phoneNumber = tm.getLine1Number();
return phoneNumber;
}
在另外一个activity类里面调用的时候
总是出现进程关闭 无法获取手机信息。后来发现
getSystemService这个方法基于context,只有存在TextView控件的窗体中这个方法才会被激活~
|
于是：
1. 给BasicInfo
添加一个带参数Context的构造函数：
public
BasicInfo (Context context)
{
this.context = context;
}
2. getPhoneNumber()函数里面改成：
context.getSystemService(Context.TELEPHONY_SERVIC);
3. 在调用类里面 BasicInfo bi = new
BasicInfo(this);
bi.getPhoneNumber();
android中getSystemService详解,布布扣,bubuko.com
android中getSystemService详解
标签：android des blog http strong os
原文地址：http://www.cnblogs.com/kevincode/p/3844708.html
