Java tutorial
/** * Copyright 2015 Google Inc. All Rights Reserved. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.android.nunes.sophiamobile.gsm; import org.apache.commons.io.IOUtils; import org.json.JSONException; import org.json.JSONObject; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.net.HttpURLConnection; import java.net.URL; public class GcmSender { public static final String API_KEY = "AIzaSyB8ytfj6SsItOagXw6jI1Jms8hdxnCRL4g"; public static void enviar(String msg, String token) { try { // Prepare JSON containing the GCM message content. What to send and where to send. JSONObject jGcmData = new JSONObject(); JSONObject jData = new JSONObject(); jData.put("message", msg.trim()); // Where to send GCM message. if (token != null) { jGcmData.put("to", token.trim()); } else { jGcmData.put("to", "/topics/global"); } // What to send in GCM message. jGcmData.put("data", jData); // Create connection to send GCM Message request. URL url = new URL("https://android.googleapis.com/gcm/send"); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setRequestProperty("Authorization", "key=" + API_KEY); conn.setRequestProperty("Content-Type", "application/json"); conn.setRequestMethod("POST"); conn.setDoOutput(true); // Send GCM message content. OutputStream outputStream = conn.getOutputStream(); outputStream.write(jGcmData.toString().getBytes()); // Read GCM response. InputStream inputStream = conn.getInputStream(); String resp = IOUtils.toString(inputStream); System.out.println(resp); System.out.println("Check your device/emulator for notification or logcat for " + "confirmation of the receipt of the GCM message."); } catch (IOException e) { System.out.println("Unable to send GCM message."); System.out.println("Please ensure that API_KEY has been replaced by the server " + "API key, and that the device's registration token is correct (if specified)."); e.printStackTrace(); } catch (JSONException e) { e.printStackTrace(); } } }