百度云推送支持IOS和Android的云推送。Android支持的还不错，但是IOS一般很难调通。百度云对于IOS的推送来说，他只是做了一个中间的代理，为用户提供接口，优点是使用百度云推送，Android和IOS可以统一管理；缺点是：调通不容易，用户的IOS证书需要上传验证，会直接暴露给第三方，并且IOS的apns支持用户自己构建provider服务器，与apns直接通信。
个人建议：Android使用百度云推送，IOS的使用自己构建的provider与IOS的apns直接通信。与IOS的apns直接通信有许多实现，Java、PHP、object-c、c++，在我的博客中有一篇是使用erlang实现的，有兴趣的可以看看。
Android实现推送功能百度云有自己的demo，大家可以根据官网（http://developer.baidu.com/wiki/index.php?title=docs/cplat/push）的步骤，首先注册一个百度开发者账号，然后创建自己的一个应用，根据例子百度云服务器会自己生产一个客户端的demo，可以运行在Android的手机上。然后在页面进行推送实验。当然也可以下载百度云推送服务器，然后通过运行使用服务器推送，官网中有php、Java、Python、node.js、c#实现。
步骤：1、首先将上面你建立的工程中百度云服务器为你生产的例子demo安装到手机上，然后以自己注册的开发者账号登陆，里面有一个userid和channelId,channelId记录下来，UserId和开发者上的对应一下，然后决定使用哪一个，如果一样，那没问题，不一样的话一般采用注册者页面中的那个。也可以通过Android服务端获取的数据分析出userid。
给用户发送消息分几种情况分别如下：给某个用户的所有设备发送信息此时需要用户的userid；给用户的某个设备发送信息此时需要用户的userid和channelid；给某类用户发送信息，需要tag分类，也就是给该类的所有用户发送信息。
start() ->
inets:start(),
{Mega,Sec,_} = now(),
ApiKey = "apikey=aghjklpoikmnbhjklpoijnbfd",%%用户的APIkey
%% 我的设备
% Channel_Id = "channel_id=1234567890098765432",%% 用户的某一设备channelid，也就是客户端demo安装在的手机的channelid
%% 模拟器
Channel_Id = "channel_id=3959774938927755088",%%客户端模拟器的channelid
Device_Type = "device_type=3",%%类型，细节在官方文档中查看，1：浏览器设备；2：PC设备；3：Android设备；4：IOS设备；5：Windows phone设备
Message_Type = "message_type=1",%% 0：消息；1：通知；默认为0
TitleStr = " :kkkk,嘎嘎嘎阿 达航空 件阿 斯顿，，，,哈哈哈,erlang",
DescriptionStr = "行不:行啊!",
Messages0 = "messages={\"title\":\"",
Messages1 = TitleStr,
Messages2 = "\",\"description\":\"",
Messages3 = DescriptionStr,
Messages4 = "\",\"notification_builder_id\":0,"
++ "\"notification_basic_style\":2,\"open_type\":2,\"url\":\"\",\"user_confirm\":0,\"pkg_content\":\"\",\"custom_content\":\"\"}",
Messages = Messages0 ++ Messages1 ++ Messages2 ++ Messages3 ++ Messages4,
Method = "method=push_msg",
Msg_keys= "msg_keys=erlang_keys",
Push_Type = "push_type=1",
Time = "timestamp="++ integer_to_list((Mega * 1000000 + Sec)),
User_Id = "user_id=213123123",%%用户的userid
Url = "http://channel.api.duapp.com/rest/2.0/channel/channel",
Http_Method = "POST",
SecretKey = "123weqwe12wq12eqweqweqwe",%%用户的secretekey
Str0 = Http_Method ++ Url ++ ApiKey ++ Channel_Id ++ Device_Type ++ Message_Type ++ Messages0,
Str1 = Messages2,
Str2 = Messages4 ++ Method ++ Msg_keys ++ Push_Type ++ Time ++ User_Id ++ SecretKey,
TitleBin = list_to_binary(TitleStr),
TIntegerU = unicode:characters_to_list(TitleBin,utf8),
TChanges = utf8(TIntegerU,[]),
Title_Utf8 =
lists:foldl(fun(Change,Acc) ->
case Change of
[Term] when Term >= $a, Term = $z ->
Acc ++ Change;
[Term] when Term >= $A, Term = $Z ->
Acc ++ Change;
[Term] when Term >= $0, Term = $9 ->
Acc ++ Change;
[Term] when Term =:= $. ->
Acc ++ Change;
[Term] when Term =:= $_ ->
Acc ++ Change;
[Term] when Term =:= $- ->
Acc ++ Change;
[Term] when Term =:= 32 ->
Acc ++ [43];
_ ->
Acc ++ list_to_hex_s(Change)
end
end,[],TChanges),
DesBin = list_to_binary(DescriptionStr),
DIntegerU = unicode:characters_to_list(DesBin,utf8),
DChanges = utf8(DIntegerU,[]),
Des_Utf8 =
lists:foldl(fun(Change,Acc) ->
case Change of
[Term] when Term >= $a, Term = $z ->
Acc ++ Change;
[Term] when Term >= $A, Term = $Z ->
Acc ++ Change;
[Term] when Term >= $0, Term = $9 ->
Acc ++ Change;
[Term] when Term =:= $. ->
Acc ++ Change;
[Term] when Term =:= $_ ->
Acc ++ Change;
[Term] when Term =:= $- ->
Acc ++ Change;
_ ->
Acc ++ list_to_hex_s(Change)
end
end,[],DChanges),
StrValue = escape_uri(Str0) ++ Title_Utf8 ++ escape_uri(Str1) ++ Des_Utf8 ++ escape_uri(Str2),
Md5Str = md5_hex(StrValue),
Sign = "sign=" ++ Md5Str,
PostInfo = ApiKey ++ "" ++ Sign ++ "" ++ User_Id ++ ""
++ Channel_Id ++ "" ++ Device_Type ++ "" ++ Message_Type ++ "" ++ Messages
++ "" ++ Method ++ "" ++ Msg_keys ++ "" ++ Push_Type ++ "" ++ Time,
timer:sleep(30*1000),
Result = httpc:request(post,{Url,[],"application/x-www-form-urlencoded",PostInfo},[],[]),
case Result of
{ok,{{"HTTP/1.1",200,"OK"},_,_}} ->
nothing;
_ ->
io:format("Result:~p~n",[Result])
end.
