client process可以藉由bind service process來取得資訊, 步驟如下 :
1. 在專案中的src/目錄下建立aidl檔, ex: IRemoteService.aidl
package com.example.android;
/* Example service interface */
interface IRemoteService
{
// Request the process ID of this service
int getPid();
}
經過build之後就會在gen/目錄下產生對應的.java檔, ex: IRemoteService.java
2. 在service端實作該interface
在剛剛產生的.java interface檔案中包含了一個名為Stub的subclass(a binder)
實作該interface, 並且在service的onBind()回傳該interface
public class RemoteService extends Service
{
@Override
public IBinder onBind(Intent intent)
{
// Return the interface
return mBinder;
}
private final IRemoteService.Stub mBinder = new IRemoteService.Stub()
{
// Implement the interface
public int getPid()
{
return Process.myPid();
}
};
}
3. client process可以藉由bind service與service進行溝通
client process在bind service之後(待service回傳IBinder之後)即可對service提供的method進行操作
IRemoteService mIRemoteService;
private ServiceConnection mConnection = new ServiceConnection()
{
// Called when the connection with the service is established
public void onServiceConnected(ComponentName className, IBinder service)
{
// This gets an instance of the IRemoteInterface, which we can use to call on the service
mIRemoteService = IRemoteService.Stub.asInterface(service);
// Call method of service
mIRemoteService.getPid();
}
// Called when the connection with the service disconnects unexpectedly
public void onServiceDisconnected(ComponentName className)
{
mIRemoteService = null;
}
};
注意事項 : aidl檔在client和service的src/目錄下都要存在一份(複製過去即可), 雙方才知道此interface
