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Android ApiDemos示例解析(43):App->Service->Remote Service Controller

Remote Service Controller 和使用Local Service的Android ApiDemo示例解析(40):App->Service->Local Service Controller

都是使用Service的“Started” 模式,RemoteService在 AndroidManifest.xml中的定义如下:

<service android:name=”.app.RemoteService” android:process=”:remote”>
<intent-filter>
< !– These are the inte易做图ces supported by the service, which
you can bind to. –>
<action android:name=”com.example.android.apis.app.IRemoteService” />
<action android:name=”com.example.android.apis.app.ISecondary” />
< !– This is an action code you can use to select the service
without explicitly supplying the implementation class. –>
<action android:name=”com.example.android.apis.app.REMOTE_SERVICE” />
< /intent-filter>
< /service>

RemoteService.Controller 中启动和停止Service的代码如下,和“Bound” Service模式相比要简单的多:

[java] 
// Make sure the service is started.  It will continue running  
// until someone calls stopService().  
// We use an action code here, instead of explictly supplying  
// the component name, so that other packages can replace  
// the service.  
startService(new Intent( 
 "com.example.android.apis.app.REMOTE_SERVICE")); 
  
... ... 
  
 // Cancel a previous call to startService().  Note that the  
// service will not actually stop at this point if there are  
// still bound clients.  
stopService(new Intent( 
 "com.example.android.apis.app.REMOTE_SERVICE")); 
// Make sure the service is started.  It will continue running
// until someone calls stopService().
// We use an action code here, instead of explictly supplying
// the component name, so that other packages can replace
// the service.
startService(new Intent(
 "com.example.android.apis.app.REMOTE_SERVICE"));
 
... ...
 
 // Cancel a previous call to startService().  Note that the
// service will not actually stop at this point if there are
// still bound clients.
stopService(new Intent(
 "com.example.android.apis.app.REMOTE_SERVICE"));

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“Started” Service在启动之后会一直运行,直到调用stopService为止。因此在按“Start Service”后,在运行 Android ApiDemo示例解析(42):App->Service->Remote Service Binding 来绑定这个RemoteService,由于RemoteService已经启动,你会发现例42中的Received from Service的初始值一般不会为1。

作者:mapdigit
 

 

补充:移动开发 , Android ,
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