asp.net 关于android 消息推送
2012-04-16 10:00
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原文: http://www.codeproject.com/Articles/339162/Android-push-notification-implementation-using-ASP
notification service to give updates to application users. Here I will explain how we can use Google’s C2DM (Cloud to Device Messaging) push notification service. The figure above shows a typical flow of push notification.
Credentials — The IDs and tokens that are used in different stages of C2DM to ensure that all parties have been authenticated, and that the message is going to the correct place.
Enabling C2DM - An Android application running on a mobile device registers to receive messages.
Sending a message - A third-party application server sends messages to the device.
Receiving a message - An Android application receives a message from a C2DM server.
Integrate C2DM to the Android application and Google will return the RegistrationID. Use this RegistrationID in the ASP.NET application. http://code.google.com/android/c2dm/index.html#writing_apps
RegistrationID
Google User Account
Message Text
Your code should follow the three simple steps below to send a Push notification.
Authentication process with Google.
Server certification validation.
Submit a message.
Let’s go one by one.
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Code
Make sure this delegation method is called before we submit a message to C2DM.
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Code
Now we have to use RegistrationID, Message, and AuthenticationToken/String here.
First create a
as a query string along with the URL.
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Code
(In case you can use
Read the below code and try to understand the implementation.
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Code
To send a push notification to the Android application is now just two lines of code.
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Code
Call the
and
This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)
Introduction
In this article I will try to explain how we can integrate a push notification service for Android using ASP.NET and C#. We all know that mobile applications are booming the market trend. Some custom mobile applications use the pushnotification service to give updates to application users. Here I will explain how we can use Google’s C2DM (Cloud to Device Messaging) push notification service. The figure above shows a typical flow of push notification.
Requirements
Components — The physical entities that play a role in C2DM.Credentials — The IDs and tokens that are used in different stages of C2DM to ensure that all parties have been authenticated, and that the message is going to the correct place.
Components | |
Mobile Device | The device that is running an Android application that uses C2DM. This must be a 2.2 Android device that has Market installed, and it must have at least one logged-in Google account. |
Third Party Application Server | An application server that developers set up as part of implementing C2DM in their applications. The third-party application server sends data to an Android application on the device via the C2DM server. |
C2DM Server | The Google servers involved in taking messages from the third-party application server and sending them to the device. |
Credentials | |
Sender ID | An email account associated with the application's developer. The sender ID is used in the registration process to identify an Android application that is permitted to send messages to the device. This ID is typically role-based rather than being a personal account—- for example, my-app@gmail.com. |
Application ID | The application that is registering to receive messages. The application is identified by the package name from the manifest. This ensures that the messages are targeted at the correct application. |
Registration ID | An ID issued by C2DM servers to the Android application that allows it to receive messages. Once the application has the registration ID, it sends it to the third-party application server, which uses it to identify each device that has registered to receive messages for a given application. In other words, a registration ID is tied to a particular application running on a particular device. |
Google User Account | For C2DM to work, the mobile device must include at least one logged-in Google account. |
Sender Auth Token | A ClientLogin Auth token that is saved on the third-party application server that gives the application server authorized access to Google services. The token is included in the header of POST requests that sends messages. For more discussion of ClientLogin Auth tokens, see ClientLogin for Installed Applications. |
Life Cycle Flow
Here are the primary processes involved in cloud-to-device messaging:Enabling C2DM - An Android application running on a mobile device registers to receive messages.
Sending a message - A third-party application server sends messages to the device.
Receiving a message - An Android application receives a message from a C2DM server.
Action Item From Android Application
First you need to register your application with C2DM services.http://code.google.com/android/c2dm/signup.htmlIntegrate C2DM to the Android application and Google will return the RegistrationID. Use this RegistrationID in the ASP.NET application. http://code.google.com/android/c2dm/index.html#writing_apps
Action Item From ASP.NET Application
On the ASP.NET application side, we require the following credentials:RegistrationID
Google User Account
Message Text
Your code should follow the three simple steps below to send a Push notification.
Authentication process with Google.
Server certification validation.
Submit a message.
Let’s go one by one.
1. Authentication Process
First you need to pass the SenderID (Google user account name) and its password to get the authentication string. Remember, this authentication string will be used when we submit message to the C2DM server.Collapse | Copy
Code
/// <summary> /// Check authentication with supplied credential /// </summary> /// <param name="SenderID">Google EmailID</param> /// <param name="Password">Password of EmailID</param> /// <returns></returns> public string CheckAuthentication(string SenderID, string Password) { string Array = ""; string URL = "https://www.google.com/accounts/ClientLogin?"; string fullURL = URL + "Email=" + SenderID.Trim() + "&Passwd=" + Password.Trim() + "&accountType=GOOGLE" + "&source=Company-App-Version" + "&service=ac2dm"; HttpWebRequest Request = (HttpWebRequest)HttpWebRequest.Create(fullURL); try { //-- Post Authentication URL --// HttpWebResponse Response = (HttpWebResponse)Request.GetResponse(); StreamReader Reader; int Index = 0; //-- Check Response Status --// if (Response.StatusCode == HttpStatusCode.OK) { Stream Stream = Response.GetResponseStream(); Reader = new StreamReader(Stream); string File = Reader.ReadToEnd(); Reader.Close(); Stream.Close(); Index = File.ToString().IndexOf("Auth=") + 5; int len = File.Length - Index; Array = File.ToString().Substring(Index, len); } } catch (Exception ex) { Array = ex.Message; ex = null; } return Array; }
2. Server Certification
Here we are not going to install any certificates on the development workstation or application server and then verify it in code. But we are doing a little bit of delegation modeling for the validating server certification.Make sure this delegation method is called before we submit a message to C2DM.
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Code
//-- Delegate Modeling to Validate Server Certificate --// ServicePointManager.ServerCertificateValidationCallback += delegate( object sender, System.Security.Cryptography.X509Certificates.X509Certificate pCertificate, System.Security.Cryptography.X509Certificates.X509Chain pChain, System.Net.Security.SslPolicyErrors pSSLPolicyErrors) { return true; };
3. Send Message
Finally we are in the last step to send the push notification on the device. After successfully finishing the above two steps we have to write the below code to finalize the process.Now we have to use RegistrationID, Message, and AuthenticationToken/String here.
First create a
httpWebRequestobject with the URL that is shown in the code. Also we need to pass the following name value pair
as a query string along with the URL.
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Code
registration_id<br />collapse_key<br />delay_while_idle<br />data.payload
(In case you can use
data.messageas an alternate.)
Read the below code and try to understand the implementation.
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Code
public string SendMessage(string RegistrationID, string Message, string AuthString)
{
//-- Create C2DM Web Request Object --//
HttpWebRequest Request = (HttpWebRequest)WebRequest.Create(
"https://android.clients.google.com/c2dm/send");
Request.Method = "POST";
Request.KeepAlive = false;
//-- Create Query String --//
NameValueCollection postFieldNameValue = new NameValueCollection();
postFieldNameValue.Add("registration_id", RegistrationID);
postFieldNameValue.Add("collapse_key", "1");
postFieldNameValue.Add("delay_while_idle", "0");
// postFieldNameValue.Add("data.message", Message);
postFieldNameValue.Add("data.payload", Message);
string postData = GetPostStringFrom(postFieldNameValue);
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
Request.ContentType = "application/x-www-form-urlencoded;charset=UTF-8";
Request.ContentLength = byteArray.Length;
Request.Headers.Add(HttpRequestHeader.Authorization, "GoogleLogin auth=" + AuthString);
//-- Delegate Modeling to Validate Server Certificate --// ServicePointManager.ServerCertificateValidationCallback += delegate( object sender, System.Security.Cryptography.X509Certificates.X509Certificate pCertificate, System.Security.Cryptography.X509Certificates.X509Chain pChain, System.Net.Security.SslPolicyErrors pSSLPolicyErrors) { return true; };
//-- Create Stream to Write Byte Array --//
Stream dataStream = Request.GetRequestStream();
dataStream.Write(byteArray, 0, byteArray.Length);
dataStream.Close();
//-- Post a Message --//
WebResponse Response = Request.GetResponse();
HttpStatusCode ResponseCode = ((HttpWebResponse)Response).StatusCode;
if (ResponseCode.Equals(HttpStatusCode.Unauthorized) ||
ResponseCode.Equals(HttpStatusCode.Forbidden))
{
return "Unauthorized - need new token";
}
else if (!ResponseCode.Equals(HttpStatusCode.OK))
{
return "Response from web service isn't OK";
}
StreamReader Reader = new StreamReader(Response.GetResponseStream());
string responseLine = Reader.ReadLine();
Reader.Close();
return responseLine;
}
Using the Code Sample
You can browse the attached sample code. I have created it as a library file. You can add AndroidPushNotification.dllto your project reference and use it.To send a push notification to the Android application is now just two lines of code.
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Code
using PushNotification; namespace TestAndroidPush { public partial class Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { //-- Create Object of PushNotification class --// PushNotification.PushNotification objPush = new PushNotification.PushNotification(); //-- Send Push Message --// blStatus.Text = objPush.Android("5grDMrPboQIz0Fpyojo-_u2", "myapplication@gmail.com", "myapppassword", "Testing DLL"); } } } }
Call the
objPush.Androidfunction with
RegistrationID,
SenderID,
Password,
and
Message.
Conclusion
I hope this code will make your life easy to integrate the Android Push Notification with ASP.NET and C#. Again reminding you that you can use this code to run an Android push notification without any server certification.
License
This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)
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