联系GCM的最佳方式是通过服务。
创建一个IntentService来捕获从 Activity 释放的意图
onHandleIntent（意图意图）
设备发送服务请求 GCM 并接收 tokenID。
InstanceID instanceID = InstanceID.getInstance(this); 字符串令牌 = instanceID.getToken(getString(R.string.gcm_defaultSenderId), GoogleCloudMessaging.INSTANCE_ID_SCOPE, null);
实施此方法以将任何注册发送到您的应用程序的服务器。
发送注册到服务器（令牌）
通知 UI 注册完成
Intent registrationComplete = new Intent(GcmUtils.REGISTRATION_COMPLETE); LocalBroadcastManager.getInstance(this).sendBroadcast(registrationComplete);
- （可选）订阅主题频道 private void subscribeTopics(String token, ArrayList topics_gcm)throws IOException { for (String topic : topics_gcm) { GcmPubSub pubSub = GcmPubSub.getInstance(this); pubSub.subscribe(token, topic, null); } }
全意向服务：
public class RegistrationIntentService extends IntentService {
private static final String TAG = "RegIntentService";
public RegistrationIntentService() {
super(TAG);
}
@Override
protected void onHandleIntent(Intent intent) {
ArrayList<String> topics_gcm = intent.getStringArrayListExtra("topics_gcm");
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
try {
// In the (unlikely) event that multiple refresh operations occur simultaneously,
// ensure that they are processed sequentially.
synchronized (TAG) {
// Initially this call goes out to the network to retrieve the token, subsequent calls
// are local.
// [START get_token]
InstanceID instanceID = InstanceID.getInstance(this);
String token = instanceID.getToken(getString(R.string.gcm_defaultSenderId),
GoogleCloudMessaging.INSTANCE_ID_SCOPE, null);
// [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);
// TODO: Subscribe to topic channels
//subscribeTopics(token, topics_gcm);
// 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(GcmUtils.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(GcmUtils.SENT_TOKEN_TO_SERVER, false).apply();
}
// Notify UI that registration has completed, so the progress indicator can be hidden.
Intent registrationComplete = new Intent(GcmUtils.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) {
// Add custom implementation, as needed.
}
/**
* 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, ArrayList<String> topics_gcm) throws IOException {
for (String topic : topics_gcm) {
GcmPubSub pubSub = GcmPubSub.getInstance(this);
pubSub.subscribe(token, topic, null);
}
}
// [END subscribe_topics]
}
- 从任何上下文启动 IntentService：活动、服务....
Intent intent = new Intent(getContext(), egistrationIntentService.class);
intent.putCharSequenceArrayListExtra("topics_gcm", topcics_gcm);
getContext().startService(intent);