Android中不使用AIDL实现Service的远程调用

优点：Client端与Server端的DESCRIPTOR可以自定义，不受包名限制

实质中其实是使用底层Binder机制提供的Java层接口 Binder 、IInterface等去实现

客户端中使用transact发起进程间通信请求，服务端会回调onTransact来处理请求

Common Interface:

public interface ITimeCountService {
int getCount() throws RemoteException;
}

Server:

public abstract class TimeCountStub extends android.os.Binder implements
IInterface, ITimeCountService {
private static final java.lang.String DESCRIPTOR = "com.example.servicedemo.nonaidl.ITimeCountService";

/** Construct the stub at attach it to the interface. */
public TimeCountStub() {
this.attachInterface(this, DESCRIPTOR);
}

@Override
public android.os.IBinder asBinder() {
return this;
}

@Override
public boolean onTransact(int code, android.os.Parcel data,
android.os.Parcel reply, int flags)
throws android.os.RemoteException {
switch (code) {
case INTERFACE_TRANSACTION: {
reply.writeString(DESCRIPTOR);
return true;
}
case TRANSACTION_getCount: {
data.enforceInterface(DESCRIPTOR);
int _result = this.getCount();
reply.writeNoException();
reply.writeInt(_result);
return true;
}
}
return super.onTransact(code, data, reply, flags);
}

static final int TRANSACTION_getCount = (android.os.IBinder.FIRST_CALL_TRANSACTION + 0);
}

Client:

public class TimeCountProxy implements /*IInterface,*/ ITimeCountService {
private static final java.lang.String DESCRIPTOR = "com.example.servicedemo.nonaidl.ITimeCountService";
private android.os.IBinder mRemote;

TimeCountProxy(android.os.IBinder remote) {
mRemote = remote;
}

//	@Override
//	public android.os.IBinder asBinder() {
//		return mRemote;
//	}

public java.lang.String getInterfaceDescriptor() {
return DESCRIPTOR;
}

/**
* Cast an IBinder object into an
* com.example.servicedemo.nonaidl.ITimeCountService interface, generating a
* proxy if needed.
*/
public static ITimeCountService asInterface(
android.os.IBinder obj) {
if ((obj == null)) {
return null;
}
android.os.IInterface iin = obj.queryLocalInterface(DESCRIPTOR);
if (((iin != null) && (iin instanceof ITimeCountService))) {
return ((ITimeCountService) iin);
}
return new TimeCountProxy(obj);
}

@Override
public int getCount() throws android.os.RemoteException {
android.os.Parcel _data = android.os.Parcel.obtain();
android.os.Parcel _reply = android.os.Parcel.obtain();
int _result;
try {
_data.writeInterfaceToken(DESCRIPTOR);
mRemote.transact(TimeCountStub.TRANSACTION_getCount, _data, _reply,
0);
_reply.readException();
_result = _reply.readInt();
} finally {
_reply.recycle();
_data.recycle();
}
return _result;
}
}

Service中片段:

public class TimeCountService extends Service {

...

TimeCountStub stub = new TimeCountStub() {

@Override
public int getCount() throws RemoteException {
return count;
}
};

@Override
public IBinder onBind(Intent intent) {
Log.i(TAG, "onBind");
return stub;
}

...

}

Client中片段:

public class MainActivity extends Activity {

...

private ITimeCountService timeCountService;

private ServiceConnection conn = new ServiceConnection() {

@Override
public void onServiceConnected(ComponentName name, IBinder service) {
Log.i(TAG, "onServiceConnected");
timeCountService = TimeCountProxy.asInterface(service);

Log.i(TAG, "timeCountService: " + timeCountService);

canTimeUpdateTaskRunning = true;
TimeUpateTask t = new TimeUpateTask();
t.execute(new Object());

Log.i(TAG, "task status: " + t.getStatus());
}

@Override
public void onServiceDisconnected(ComponentName name) {
Log.i(TAG, "onServiceDisconnected");
}
};

...

}