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POTwo ways for registration and starting service in Google Cloud Messaging (GCM)
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copied!<p>I'm trying to develop an application with GCM. I read the official document about GCM, but feeling like there are two ways for doing these.</p> <h2>1. As for registering an android device for GCM</h2> <p>It seems like there are two ways for registering a device to GCM. </p> <p>"http://developer.android.com/guide/google/gcm/gs.html#android-app" says,</p> <pre><code>GCMRegistrar.checkDevice(this); GCMRegistrar.checkManifest(this); final String regId = GCMRegistrar.getRegistrationId(this); if (regId.equals("")) { GCMRegistrar.register(this, SENDER_ID); } else { Log.v(TAG, "Already registered"); } </code></pre> <p>on the other hand, "http://developer.android.com/guide/google/gcm/gcm.html#registering" says,</p> <pre><code>Intent registrationIntent = new Intent("com.google.android.c2dm.intent.REGISTER"); // sets the app name in the intent registrationIntent.putExtra("app", PendingIntent.getBroadcast(this, 0, new Intent(), 0)); registrationIntent.putExtra("sender", senderID); startService(registrationIntent); </code></pre> <h2>2. As for getting responses from GCM server and starting a service for handling them</h2> <p>Also, I'm feeling like there are two ways to start intent for handling the response.</p> <p>"http://developer.android.com/guide/google/gcm/gs.html#android-app" instructs like,</p> <p>"make a sub class of com.google.android.gcm.GCMBaseIntentService"</p> <p>and implement </p> <p>onRegistered(Context context, String regId)</p> <p>onUnRegistered(Context context, String regId)</p> <p>onMessage(Context context, Intent intent)</p> <p>...etc.</p> <p>While "http://developer.android.com/guide/google/gcm/gcm.html#registering" is described with,</p> <pre><code>public class MyBroadcastReceiver extends BroadcastReceiver { @Override public final void onReceive(Context context, Intent intent) { MyIntentService.runIntentInService(context, intent); setResult(Activity.RESULT_OK, null, null); } } public class MyIntentService extends IntentService { private static PowerManager.WakeLock sWakeLock; private static final Object LOCK = MyIntentService.class; static void runIntentInService(Context context, Intent intent) { synchronized(LOCK) { if (sWakeLock == null) { PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE); sWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "my_wakelock"); } } sWakeLock.acquire(); intent.setClassName(context, MyIntentService.class.getName()); context.startService(intent); } @Override public final void onHandleIntent(Intent intent) { try { String action = intent.getAction(); if (action.equals("com.google.android.c2dm.intent.REGISTRATION")) { handleRegistration(intent); } else if (action.equals("com.google.android.c2dm.intent.RECEIVE")) { handleMessage(intent); } } finally { synchronized(LOCK) { sWakeLock.release(); } } } } </code></pre> <p>Is it right that there are two ways for doing both of the processes above, and I can use whichever way I want to?</p>

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