Android中远程Service浅析
上一篇文章中简单的写了一下关于Android中Service的两种启动方式，不过都是本地的服务，今天就简单的写下关于Android中远程Service的使用，学习之前先了解两个概念，AIDL( Android Interface definition language)字面上的意思就是借口定义语言，专业一点理解就是Android进程之间通信的接口描述语言。IPC(Inter-Process Conmmunication)内部进程之间的通信，同一个手机上，如果你的APP需要访问调用另外一个APP的服务，通信的方式就是IPC。
同一个APP中Service调用
跟上篇文章不同，这次先自行创建一个名称为BookAIDLService.aidl的AIDL文件:
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package
com.remote.service;
interface
BookAIDLService {
int
sum(
int
a,
int
b);
}
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吐槽一下，网上很多都是这么写的，自己新增的时候没有找到如何新建一个AIDL文件，你首先需要建一个BookAIDLService.java文件，然后修改后缀名为aidl，这个时候看到效果如下:
保存之后，会自动的在gen目录下生成一个BookAIDLService.java文件，还是跟最开始一样，看下应用程序页面:
本地事件针对的是第三个按钮，先来重写下BookService:
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public
class
BookService
extends
Service {
private
String tag =
"BookService"
;
BookAIDLService.Stub bookAIDLBinderStub=
new
Stub() {
@Override
public
int
sum(
int
a,
int
b)
throws
RemoteException {
// TODO Auto-generated method stub
return
a+b;
}
};
@Override
public
void
onCreate() {
// TODO Auto-generated method stub
super
.onCreate();
Log.i(tag,
"开始onCreate启动了"
);
Log.i(
"BookService"
,
"BookService的ID："
+Process.myPid());
// try {
// Thread.sleep(40000);
// } catch (InterruptedException e) {
// // TODO Auto-generated catch block
// e.printStackTrace();
// }
}
@Override
public
int
onStartCommand(Intent intent,
int
flags,
int
startId) {
// TODO Auto-generated method stub
Log.i(tag,
"开始执行onStartCommand启动了"
);
Toast.makeText(
this
,
"BookService开始了"
, Toast.LENGTH_SHORT).show();
return
super
.onStartCommand(intent, flags, startId);
}
@Override
public
void
onDestroy() {
// TODO Auto-generated method stub
Log.i(tag,
"销毁onDestroy启动了"
);
super
.onDestroy();
}
@Override
public
IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
Log.i(tag,
"绑定onBind启动了"
);
return
bookAIDLBinderStub;
}
@Override
public
boolean
onUnbind(Intent intent) {
// TODO Auto-generated method stub
Log.i(tag,
"解绑onUnbind启动了"
);
return
super
.onUnbind(intent);
}
class
BookBinder
extends
Binder {
public
BookService getCurrentService() {
return
BookService.
this
;
}
}
}
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跟之前最大的不同就是在onBind方法中返回一个bookAIDLBinderStub，同时上次写的BookConnection也要冲洗写一下:
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class
BookServiceConnection
implements
ServiceConnection{
private
BookAIDLService bookAIDLService;
public
BookServiceConnection() {
super
();
// TODO Auto-generated constructor stub
}
@Override
public
void
onServiceConnected(ComponentName name, IBinder service) {
// TODO Auto-generated method stub
//获取实例
//BookService bookService=((BookService.BookBinder)service).getCurrentService();
//just do wo you want to do
BookAIDLService bookAIDLService=BookAIDLService.Stub.asInterface(service);
try
{
int
result=bookAIDLService.sum(
10
,
100
);
Log.i(
"BookService"
,
"BookAIDLService调用结果:"
+result);
}
catch
(RemoteException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public
void
onServiceDisconnected(ComponentName name) {
// TODO Auto-generated method stub
}
}
}
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前台的调用是:
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Intent binderStartIntent=
new
Intent(
"com.example.googleservice.BookService.AIDL"
);
connection=
new
BookServiceConnection();
bindService(binderStartIntent, connection,Context.BIND_AUTO_CREATE);
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这里Intent是隐式调用，如果不是很熟悉可以参考我之前的文章，AndroidManifest.xml文件中需要重新改动一下:
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<service android:name=
"com.example.googleservice.BookService"
android:process=
":remote"
>
<intent-filter>
<action android:name=
"com.example.googleservice.BookService.AIDL"
/>
</intent-filter>
</service>
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调用结果如下:
不同的App之间的调用
不同之间的调用，由于相互之间要相互通信，同样的需要定义与服务端的aidl名相同的aidl，新建一个Android项目，然后结构如下:
客户端页面就不用写了，就一个调用按钮，客户端把服务端的BookConnection拷贝过来:
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class
BookServiceConnection
implements
ServiceConnection{
private
BookAIDLService bookAIDLService;
public
BookServiceConnection() {
super
();
// TODO Auto-generated constructor stub
}
@Override
public
void
onServiceConnected(ComponentName name, IBinder service) {
// TODO Auto-generated method stub
//获取实例
//BookService bookService=((BookService.BookBinder)service).getCurrentService();
//just do wo you want to do
BookAIDLService bookAIDLService=BookAIDLService.Stub.asInterface(service);
try
{
int
result=bookAIDLService.sum(
10
,
100
);
Log.i(
"BookService"
,
"客户端BookAIDLService调用结果:"
+result);
}
catch
(RemoteException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public
void
onServiceDisconnected(ComponentName name) {
// TODO Auto-generated method stub
}
}
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客户端调用:
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Intent binderStartIntent=
new
Intent(
"com.example.googleservice.BookService.AIDL"
);
connection=
new
BookServiceConnection();
bindService(binderStartIntent, connection,Context.BIND_AUTO_CREATE);
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调用结果如下:
本文转自Fly_Elephant博客园博客，原文链接：http://www.cnblogs.com/xiaofeixiang/p/4080389.html，如需转载请自行联系原作者
