add registration and receive token

app/src/main/AndroidManifest.xml

@@ -19,6 +19,9 @@
                 <category android:name="android.intent.category.LAUNCHER"/>
             </intent-filter>
         </activity>
+        <service
+            android:name=".services.RegistrationIntentService"
+            android:exported="false"/>
     </application>
 
 </manifest>

app/src/main/java/kr/susemi99/gcm/MainActivity.java

@@ -15,6 +15,7 @@
 import com.google.android.gms.common.GoogleApiAvailability;
 
 import kr.susemi99.gcm.managers.PreferenceManager;
+import kr.susemi99.gcm.services.RegistrationIntentService;
 
 public class MainActivity extends AppCompatActivity
 {
@@ -31,6 +32,9 @@ protected void onCreate(Bundle savedInstanceState)
     setSupportActionBar(toolbar);
 
     textHello = (TextView) findViewById(R.id.text_hello);
+
+    if (checkPlayServices())
+      startService(new Intent(this, RegistrationIntentService.class));
   }
 
   @Override

app/src/main/java/kr/susemi99/gcm/services/RegistrationIntentService.java

@@ -0,0 +1,43 @@
+package kr.susemi99.gcm.services;
+
+import android.app.IntentService;
+import android.content.Intent;
+import android.support.v4.content.LocalBroadcastManager;
+import android.util.Log;
+
+import com.google.android.gms.gcm.GoogleCloudMessaging;
+import com.google.android.gms.iid.InstanceID;
+
+import java.io.IOException;
+
+import kr.susemi99.gcm.R;
+import kr.susemi99.gcm.managers.PreferenceManager;
+
+/**
+ * Created by susemi99 on 2016. 1. 26..
+ */
+public class RegistrationIntentService extends IntentService
+{
+  public RegistrationIntentService()
+  {
+    super("");
+  }
+
+  @Override
+  protected void onHandleIntent(Intent intent)
+  {
+    InstanceID instanceID = InstanceID.getInstance(this);
+    try
+    {
+      String token = instanceID.getToken(getString(R.string.gcm_defaultSenderId), GoogleCloudMessaging.INSTANCE_ID_SCOPE, null);
+      Log.i("RegistrationIntentService | onHandleIntent", "|" + token + "|");
+      PreferenceManager.instance(this).sentToken(true);
+
+      Intent registrationCompleteIntent = new Intent(getString(R.string.action_registration_complete));
+      LocalBroadcastManager.getInstance(this).sendBroadcast(registrationCompleteIntent);
+    } catch (IOException e)
+    {
+      e.printStackTrace();
+    }
+  }
+}