三个步骤:
	1.发射源
	2.接收源
	3.发射源与接收源关联

===================

发射源代码
------------
	Observable<String> sender = Observable.create(new Observable.OnSubscribe<String>() {

	   @Override
		public void call(Subscriber<? super String> subscriber) {

			subscriber.onNext("Hi，Weavey！");  //发送数据"Hi，Weavey！"
		}
	});
--------------
	
接收源代码
-------------
	Observer<String> receiver = new Observer<String>() {

		@Override
		public void onCompleted() {

			//数据接收完成时调用
		}

		@Override
		public void onError(Throwable e) {

			//发生错误调用
		}

		@Override
		public void onNext(String s) {

		   //正常接收数据调用
			System.out.print(s);  //将接收到来自sender的问候"Hi，Weavey！"
		}
	};
--------------

关联
--------------
	sender.subscribe(receiver);
------------