getSystemService()介绍

╰半橙微兮° 2022-05-16 07:23 121阅读 0赞

另外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。

<table style="padding:0px; margin:5px 0px; border-collapse:collapse; empty-cells:show; font-size:12px; line-height:18px; border-spacing:0px; word-wrap:break-word; word-break:break-all; border:1px solid rgb(136,136,136); color:rgb(0,0,0); font-family:verdana,sans-serif; text-align:left"> 
 <tbody> 
  <tr> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> 传入的Name</td> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> 返回的对象</td> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> 说明</td> 
  </tr> 
  <tr> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> WINDOW_SERVICE</td> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> WindowManager</td> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> 管理打开的窗口程序</td> 
  </tr> 
  <tr> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> LAYOUT_INFLATER_SERVICE</td> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> LayoutInflater</td> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> 取得xml里定义的view</td> 
  </tr> 
  <tr> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> ACTIVITY_SERVICE</td> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> ActivityManager</td> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> 管理<a href="http://dev.10086.cn/cmdn/wiki/index.php?doc-view-1781" style="padding:0px; margin:0px; color:rgb(2,104,205)" rel="nofollow">应用程序</a>的系统状态</td> 
  </tr> 
  <tr> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> POWER_SERVICE</td> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> PowerManger</td> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> 电源的服务</td> 
  </tr> 
  <tr> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> ALARM_SERVICE</td> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> AlarmManager</td> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> 闹钟的服务</td> 
  </tr> 
  <tr> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> NOTIFICATION_SERVICE</td> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> NotificationManager</td> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> 状态栏的服务</td> 
  </tr> 
  <tr> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> KEYGUARD_SERVICE</td> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> KeyguardManager</td> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> 键盘锁的服务</td> 
  </tr> 
  <tr> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> LOCATION_SERVICE</td> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> LocationManager</td> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> 位置的服务，如GPS</td> 
  </tr> 
  <tr> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> SEARCH_SERVICE</td> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> SearchManager</td> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> 搜索的服务</td> 
  </tr> 
  <tr> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> VEBRATOR_SERVICE</td> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> Vebrator</td> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> 手机震动的服务</td> 
  </tr> 
  <tr> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> CONNECTIVITY_SERVICE</td> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> Connectivity</td> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> 网络连接的服务</td> 
  </tr> 
  <tr> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> WIFI_SERVICE</td> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> WifiManager</td> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> Wi-Fi服务</td> 
  </tr> 
  <tr> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> TELEPHONY_SERVICE</td> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> TeleponyManager</td> 
   <td style="margin:0px; padding:3px 10px; vertical-align:top; border:1px solid rgb(136,136,136)"> 电话服务</td> 
  </tr> 
 </tbody> 
</table>

Java代码

1.  Java代码  
2.  //基本用法    
3.  **public** **void** showCustomDialog()\{    
4.    AlertDialog.Builder builder;    
5.    AlertDialog alertDialog;    
6.    Context mContext = AppActivity.**this**;    
7.  //下面俩种方法都可以    
8.    //LayoutInflater inflater = getLayoutInflater();    
9.    LayoutInflater inflater = (LayoutInflater)     
10. mContext.getSystemService(LAYOUT\_INFLATER\_SERVICE);    
11.   View layout = inflater.inflate(R.layout.custom\_dialog,**null**);    
12.   TextView text = (TextView) layout.findViewById(R.id.text);    
13.   text.setText("Hello, Welcome to Mr Wei's blog!");    
14.   ImageView image = (ImageView) layout.findViewById(R.id.image);    
15.   image.setImageResource(R.drawable.icon);    
16.   builder = **new** AlertDialog.Builder(mContext);    
17.   builder.setView(layout);    
18.   alertDialog = builder.create();    
19.   alertDialog.show();    
20.  \}    
21. \}    
22.     
23. **protected** **void** showToast(**int** type) \{      
24.         Toast.makeText(**this**, "\*\*\*\*\*\*\*\*\*", Toast.LENGTH\_LONG).show();      
25.       
26.         LayoutInflater li = (LayoutInflater) getSystemService(Context.LAYOUT\_INFLATER\_SERVICE);      
27.         View view = li.inflate(R.layout.toast, **null**);      
28.               
29.         Toast toast = **new** Toast(**this**);      
30.         toast.setView(view);      
31.         toast.setDuration(type);      
32.         toast.show();      
33.     \}