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 jackwu.com.gasprice.GCMService; import android.app.IntentService; import android.content.Intent; import android.content.SharedPreferences; import android.preference.PreferenceManager; import android.support.v4.content.LocalBroadcastManager; import android.util.Log; import com.google.android.gms.gcm.GcmPubSub; import com.google.android.gms.gcm.GoogleCloudMessaging; import com.google.android.gms.iid.InstanceID; import java.io.BufferedReader; import java.io.DataOutputStream; import java.io.IOException; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import jackwu.com.gasprice.R; public class RegistrationIntentService extends IntentService { private static final String TAG = "RegIntentService"; private static final String[] TOPICS = { "global" }; public RegistrationIntentService() { super(TAG); } @Override protected void onHandleIntent(Intent intent) { SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this); try { // [START register_for_gcm] // Initially this call goes out to the network to retrieve the token, subsequent calls // are local. // [START get_token] String authorizedEntity = "gasprice-ebde4"; // Project id from Google Developers Console String scope = "GCM"; // e.g. communicating using GCM, but you can use any // URL-safe characters up to a maximum of 1000, or // you can also leave it blank. InstanceID instanceID = InstanceID.getInstance(this); String token = instanceID.getToken(getString(R.string.gcm_defaultSenderId), GoogleCloudMessaging.INSTANCE_ID_SCOPE, null); String device_id = sharedPreferences.getString("device-id", null); if (device_id == null) throw new Exception(); // [END get_token] Log.i(TAG, "GCM Registration Token: " + token); // TODO: Implement this method to send any registration to your app's servers. sendRegistrationToServer(token, device_id); // Subscribe to topic channels subscribeTopics(token); // // You should store a boolean that indicates whether the generated token has been // // sent to your server. If the boolean is false, send the token to your server, // // otherwise your server should have already received the token. // sharedPreferences.edit().putBoolean(QuickstartPreferences.SENT_TOKEN_TO_SERVER, true).apply(); // [END register_for_gcm] } catch (Exception e) { Log.d(TAG, "Failed to complete token refresh", e); // If an exception happens while fetching the new token or updating our registration data // on a third-party server, this ensures that we'll attempt the update at a later time. sharedPreferences.edit().putBoolean(QuickstartPreferences.SENT_TOKEN_TO_SERVER, false).apply(); } // Notify UI that registration has completed, so the progress indicator can be hidden. Intent registrationComplete = new Intent(QuickstartPreferences.REGISTRATION_COMPLETE); LocalBroadcastManager.getInstance(this).sendBroadcast(registrationComplete); } /** * Persist registration to third-party servers. * * Modify this method to associate the user's GCM registration token with any server-side account * maintained by your application. * * @param token The new token. */ private void sendRegistrationToServer(String token, String device_id) throws Exception { // Add custom implementation, as needed. HttpURLConnection urlConnection = null; URL url = null; String parameter = "device_id=" + device_id; String parameter2 = "gcm_regid=" + token; try { url = new URL(getString(R.string.server_address_register)); urlConnection = (HttpURLConnection) url.openConnection(); urlConnection.setRequestMethod("POST"); urlConnection.setRequestProperty("Content-Type", "application/x-www.form-urlencoded"); urlConnection.setRequestProperty("Content-Language", "en-US"); urlConnection.setUseCaches(false); urlConnection.setDoInput(true); urlConnection.setDoOutput(true); DataOutputStream dos = new DataOutputStream(urlConnection.getOutputStream()); dos.writeBytes(parameter); dos.writeBytes(parameter2); dos.flush(); dos.close(); int responseCode = urlConnection.getResponseCode(); if (responseCode == HttpURLConnection.HTTP_OK) { BufferedReader in = new BufferedReader(new InputStreamReader(urlConnection.getInputStream())); String inputLine; StringBuffer response = new StringBuffer(); while ((inputLine = in.readLine()) != null) { response.append(inputLine); } in.close(); if (!response.toString().equals("success")) { throw new Exception("not success"); } } } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } /** * Subscribe to any GCM topics of interest, as defined by the TOPICS constant. * * @param token GCM token * @throws IOException if unable to reach the GCM PubSub service */ // [START subscribe_topics] private void subscribeTopics(String token) throws IOException { GcmPubSub pubSub = GcmPubSub.getInstance(this); for (String topic : TOPICS) { pubSub.subscribe(token, "/topics/" + topic, null); } } // [END subscribe_topics] }