补充一点：out和in参数区别其实很明显我们直接查看adt生成在gen目录下对应的java文件就可以看出区别：当是out参数的时候是执行完之后从parcel对象读取值，而in参数时是写到parcel对象里面传过去。
我们看下当testMethod分别是out和in修饰时生成的文件
当时out的时候是从parcel对象里面读数据
mRemote.transact(Stub.TRANSACTION_testMethod, _data, _reply, 0);
_reply.readException();
if ((0!=_reply.readInt())) {
params.readFromParcel(_reply);
}
当时in的时候是从parcel对象里面取数据
if ((params!=null)) {
_data.writeInt(1);
params.writeToParcel(_data, 0);
}
else {
_data.writeInt(0);
}
mRemote.transact(Stub.TRANSACTION_testMethod, _data, _reply, 0);
_reply.readException();
（2）实现一个服务类用来实现进程之间通信MyAidlService.java，贴出部分代码，详细代码会在后面上传。
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
Log.d(TAG, "MyAidlService onBind");
return mBinder;
}
private final IMyAidlService.Stub mBinder = new IMyAidlService.Stub() {
private AIDLCallback cb;
@Override
public void saveDemoInfo(DemoParcelable demo) throws RemoteException {
if (demo != null) {
if ("meinv1".equals(demo.getDemo_name())) {
demo.setDemo_name("meinv2");
}
list.add(demo);
Log.d(TAG, "saveDemoInfo list.size = " + list.size() + " list = " + list);
cb.returnResult(list, 5);
Bundle params = new Bundle();
cb.testMethod(params);
int width = params.getInt("width", 0);
int height = params.getInt("height", 0);
Log.d(TAG, "width = " + width + " height = "+height);
}
}
@Override
public void registerClient(AIDLCallback cb) throws RemoteException {
cb.asBinder().linkToDeath(new DeathRecipient() {
@Override
public void binderDied() {
try {
Log.i(TAG, "[ServiceAIDLImpl]binderDied.");
} catch (Throwable e) {
}
}
}, 0);
}
};
