关于netty的疑惑

应用场景为 android中使用netty，android关闭无线、gprs，然后随便连接一个ip地址，部分代码

bootstrap.setOption("keepAlive", true);
bootstrap.setOption("tcpNoDelay", true);
bootstrap.setOption("connectTimeoutMillis", CONNECT_TIMEOUT);

// 向目标地址发起一个连接
ChannelFuture connectFuture = bootstrap.connect(inetSocketAddress);

session = connectFuture.awaitUninterruptibly().getChannel();

Log.i("re", "connectFuture.isSuccess()=" + connectFuture.isSuccess());
Log.i("re", "connectFuture.isConnected()=" + session.isConnected());
if (session.isConnected()) {
	businessListener.onServerConnected();
} else {
	businessListener.onServerNetWorkError();
}

竟然 session.isConnected(）为true。
打开无线或者gprs，就变得正常，为什么在没人任何网络的情况下session.isConnected()为true呢？
handler代码

private class MinaClientHandler extends SimpleChannelHandler {

		@Override
public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception {
			String theMessage = (String) e.getMessage();
			JSONObject commandJsonObject = new JSONObject(theMessage);
			businessListener.onReceive(commandJsonObject);
		}

public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
			Log.i("re", "channelConnected");
		}

		@Override
		public void channelDisconnected(ChannelHandlerContext ctx, ChannelStateEvent e) {
			Log.i("re", "channelDisconnected");
		}

		@Override
		public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e) {
			Log.i("re", "channelClosed");
		}

		public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) throws Exception {
			Throwable cause = e.getCause();
			cause.printStackTrace();
			// if (cause instanceof SocketException) {
			// ctx.getChannel().close();
			// }
			Log.i("re", "exceptionCaught");
		}
	}

没有任何网络的情况下，handler的 channelConnected channelDisconnected channelClosed 正常调用，不明白netty为什么这样处理，这样就造成当没有任何网络的的情况下，就不能通过session.isConnected(）来判断是否连接成功。