How to send notification to Android app from Java server using GCM?

Question

I have my simple Android application which uses REST web service. Now I want to sent notification from my REST web service to Android application using GCM.

How do t

Answer 1

1. package com.test;

   import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStream; import java.net.HttpURLConnection; import java.net.URL;

   public class Firebase {

   public static void main(String[] args) throws IOException {         final
   

   String apiKey = "AAAAqf1B9uQ:**********_1MoeQBVPbVROXuyD4ERyV-i6nva0LAic9uRotN80C9utoaGL9Sp1GjrPr5-mtJBlxVNbuqG1zeg9LBnslZw-vyud3jW-11SWDfLBB26bcHuAi8bdnQCPcj3DWKX2h"; URL url = new URL("https://fcm.googleapis.com/fcm/send"); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); System.setProperty("javax.net.debug","all"); conn.setDoOutput(true); conn.setRequestMethod("POST"); conn.setRequestProperty("Content-Type", "application/json"); conn.setRequestProperty("Authorization", "key=" + apiKey);

       conn.setDoOutput(true);
   
       String input = "{\r\n\"to\":
   

   \"fdaxKOmRcAI:APA91bEXILacYEjypsbusKXHV_TuEzt_vsqhI5OxH-******************-l2qGIORSiE0W5B2d74yjXAz60l\", \r\n\"notification\": {\r\n\"title\" : \" title \",\r\n\"body\" : \" Body of a single vijay \"\r\n}\r\n}";

               OutputStream os = conn.getOutputStream();       os.write(input.getBytes());         os.flush();         os.close();
   
       int responseCode = conn.getResponseCode();
       System.out.println("\nSending 'POST' request to URL : " + url);
       System.out.println("Post parameters : " + input);
       System.out.println("Response Code : " + responseCode);
   
       BufferedReader in = new BufferedReader(new
   

   InputStreamReader(conn.getInputStream())); String inputLine; StringBuffer response = new StringBuffer();

       while ((inputLine = in.readLine()) != null) {
           response.append(inputLine);         }       in.close();
   
       // print result         System.out.println(response.toString());
   
   }
   

   }

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