Java 将推送通知从ASP.NET发送到Android应用程序_Java_C#_Android_Asp.net_Android Notifications

Java 将推送通知从ASP.NET发送到Android应用程序

java c# android asp.net

Java 将推送通知从ASP.NET发送到Android应用程序,java,c#,android,asp.net,android-notifications,Java,C#,Android,Asp.net,Android Notifications,我想从我的ASP.NET WEB API Post方法向我的简单Android应用程序发送一个小推送通知。。这就是我所尝试和研究的我正在使用谷歌云消息服务向应用程序发送通知。我的应用程序以名称-值对的形式接收它。这里我还提供了服务器代码的Java版本，以及我的Post方法中的C#实现。但是我的方法抛出了一个异常 Android应用程序中出现“异常，错误为（15913）：println需要一条消息” 服务器部分的工作Java代码如下所示：- public void sendmessage2Dev

我想从我的ASP.NET WEB API Post方法向我的简单Android应用程序发送一个小推送通知。。这就是我所尝试和研究的

我正在使用谷歌云消息服务向应用程序发送通知。我的应用程序以名称-值对的形式接收它。这里我还提供了服务器代码的Java版本，以及我的Post方法中的C#实现。但是我的方法抛出了一个异常 Android应用程序中出现“异常，错误为（15913）：println需要一条消息”

服务器部分的工作Java代码如下所示：-

public void sendmessage2Device(View v,String regisID,String msg1,String msg2) {

    HttpClient client = new DefaultHttpClient();
    HttpPost post = new HttpPost(
            "https://android.googleapis.com/gcm/send");


    try {

        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
        nameValuePairs.add(new BasicNameValuePair("registration_id",regisID));

        nameValuePairs.add(new BasicNameValuePair("data1",msg1));
        nameValuePairs.add(new BasicNameValuePair("data2", msg2));






        post.setHeader("Authorization","key=AIzaSyBB6igK9sYYBTSIly6SRUHFVexeOa_7FuM");
        post.setHeader("Content-Type", "application/x-www-form-urlencoded;charset=UTF-8");




        post.setEntity(new UrlEncodedFormEntity(nameValuePairs));
        HttpResponse response = client.execute(post);
        InputStreamReader inputst = new InputStreamReader(response.getEntity().getContent());
        BufferedReader rd = new BufferedReader(inputst);


        String line = "";
        while ((line = rd.readLine()) != null) {
            Log.e("HttpResponse", line);


                String s = line.substring(0);
                Log.i("GCM response",s);
                //Toast.makeText(v.getContext(), s, Toast.LENGTH_LONG).show();


        }

    } catch (IOException e) {
        e.printStackTrace();
    }

在Android应用程序中，我有以下接收器位置

public void onReceive(Context context, Intent intent) {
    try {
        String action = intent.getAction();
        if (action.equals("com.google.android.c2dm.intent.REGISTRATION"))
        {
            String registrationId = intent.getStringExtra("registration_id");
            Log.i("Received the Registration Id as ",registrationId);
            String error = intent.getStringExtra("error");
            String unregistered = intent.getStringExtra("unregistered"); 
        }
        else if (action.equals("com.google.android.c2dm.intent.RECEIVE")) 
        {
            Log.i("In the RECEIVE Method ",intent.getStringExtra("Account"));
            String Account = intent.getStringExtra("Account");
            String Amount = intent.getStringExtra("Amount");
            Log.i("Received Account as ",Account);
            Log.i("Received Amount as  ",Amount);
        }
    }
    catch(Exception e)
    {
        Log.i("Exception Occured with Error as ",e.getMessage());
    }
    finally
    {

    }

我对Android开发非常陌生，这是我的第一个Helloworld Android应用程序。有人能告诉我我做错了什么，为什么抛出异常以及如何更正它吗？

经过一些实质性的研究后发现了这个问题。我假设Log.I（）在内部使用println将消息打印到日志中。由于GCM没有推送我的客户端代码正在查找的任何数据，因此它会引发异常。撇开这一点不谈，我得到了推送通知的工作，这里是我学到的，因为它可能对其他有同样问题的人有用

GCM使用JSON接收通知并将其推送到设备

GCM接收的JSON具有如下预定义格式

{数据： {帐户：您的号码，金额：您的金额 }, 注册号：[id1，id2，id3….] }

因此，我在ASP.NET服务器端构建了上述JSON格式，并将Http请求传递给GCM服务器，其中包含授权头。在我的接收方，我提取了案例中所需的数据（账户和金额），并相应地显示给用户

PFB我的ASP.NET服务器端和客户端接收器的代码

服务器端：-

public String Post([FromBody]TransactionDetails value, HttpRequestMessage receivedReq)
    {
        try
        {
            var httpWebRequest = (HttpWebRequest)WebRequest.Create("https://android.googleapis.com/gcm/send");
            httpWebRequest.ContentType = "application/json; charset=UTF-8";
            httpWebRequest.Method = "POST";
            httpWebRequest.Headers.Add("Authorization", "key=AIzaSyBs_eh4nNVaJl3FjQ_ZC72ZZ6uQ2F8r8W4");
            String result = "";
            String yourresp = "<html><head><title>Response from Server</title></head><body>";
            using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
            {
                string json = "{\"data\":" +"{\"Amount\":"+value.Amount+","+
                                "\"Account\":"+value.ToAccountNumber+"}"+","+
                                "\"registration_ids\":[" + "\""+value.RegID +"\"]}";


                streamWriter.Write(json);
                streamWriter.Flush();
                streamWriter.Close();

                var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
                using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
                {
                     result = streamReader.ReadToEnd();
                }
            }
            DialogResult result1 = MessageBox.Show("Server sent the details to your phone, Check and Confirm to Continue or Not", "Important Information",MessageBoxButtons.YesNo);
            if (result1.ToString().Contains("Yes"))
            {
                WriteAccountNumber(value.ToAccountNumber, value.Amount);
                yourresp += "<h1>The Transaction was Successful</h1>";

            }
            else
            {
                yourresp += "<h1>The Transaction was NOT Successful</h1>";
            }
            yourresp += "</body></html>";
            return yourresp;
        }
        catch (Exception e)
        {
            Console.WriteLine("Exception Occured in Post Method on Web Server as:{0}", e.Message);
            return e.Message;
        }
    }

所以，现在我只想知道如何用OK按钮在警报或任何类型的对话框中显示收到的通知。有谁能帮助我在我的应用程序中使用什么类和如何向用户显示它？如果应用程序未激活，它可以显示在通知栏中，否则需要一个带有“确定”按钮的弹出窗口

谢谢，

您是否发布了完整日志？在异常发生之前，您是否收到了“作为#收到的注册Id”？Logcat plz06-04 10:33:24.890:我/收到的注册Id为（19955）：APA91bHzO52-3TSEIMV3RXI45ICI9HOESIPL3GRYWAW59ATHVAGPZN86HEHOQJNU8SYJU-YD9UQSQGKZOQLLGI5AOSPMRRUW3RYGHGAPFL0ABLOA2GWFQCZGTOG\U AM0ROG00LBV8OSZ6ZMTP1JBF1S9\U DIWIQRT5WWKW6QFZ4PQYE0JCHSE 06-04 10:34:17.606:我/根据需要打印错误信息时发生异常（19955）

public String Post([FromBody]TransactionDetails value, HttpRequestMessage receivedReq)
    {
        try
        {
            var httpWebRequest = (HttpWebRequest)WebRequest.Create("https://android.googleapis.com/gcm/send");
            httpWebRequest.ContentType = "application/json; charset=UTF-8";
            httpWebRequest.Method = "POST";
            httpWebRequest.Headers.Add("Authorization", "key=AIzaSyBs_eh4nNVaJl3FjQ_ZC72ZZ6uQ2F8r8W4");
            String result = "";
            String yourresp = "<html><head><title>Response from Server</title></head><body>";
            using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
            {
                string json = "{\"data\":" +"{\"Amount\":"+value.Amount+","+
                                "\"Account\":"+value.ToAccountNumber+"}"+","+
                                "\"registration_ids\":[" + "\""+value.RegID +"\"]}";


                streamWriter.Write(json);
                streamWriter.Flush();
                streamWriter.Close();

                var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
                using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
                {
                     result = streamReader.ReadToEnd();
                }
            }
            DialogResult result1 = MessageBox.Show("Server sent the details to your phone, Check and Confirm to Continue or Not", "Important Information",MessageBoxButtons.YesNo);
            if (result1.ToString().Contains("Yes"))
            {
                WriteAccountNumber(value.ToAccountNumber, value.Amount);
                yourresp += "<h1>The Transaction was Successful</h1>";

            }
            else
            {
                yourresp += "<h1>The Transaction was NOT Successful</h1>";
            }
            yourresp += "</body></html>";
            return yourresp;
        }
        catch (Exception e)
        {
            Console.WriteLine("Exception Occured in Post Method on Web Server as:{0}", e.Message);
            return e.Message;
        }
    }

else if (action.equals("com.google.android.c2dm.intent.RECEIVE")) 
        {
            //Log.i("Message Received","Before Scheme");

            String Account=intent.getStringExtra("Account");
            String Amount=intent.getStringExtra("Amount");
            Toast.makeText(context, "Your Transaction Details Received by the Server are...\n\nAccount="+Account+"\nAmount="+Amount, Toast.LENGTH_LONG).show();
            Log.i("Account=",Account);
            Log.i("Amount=",Amount);
        }