我尝试过使用Google GCM但是当应用关闭时（从任务管理器中滑动或清除），它不会收到任何推送通知。当我再次打开应用程序时，通知已经消失并丢失。
GCM正致力于： - 应用程序已打开 - 应用程序已最小化
不工作： - 应用程序已关闭（从任务管理器轻扫） - 通过清除任务管理器中所有打开的应用程序关闭应用程序
即使应用程序像Facebook或Instagram一样关闭，我也希望收到推送通知。我怎么能实现这个？这可能在GCM中有用吗？如果有，怎么样？如果没有，那么实现这个的另一种方法是什么？
这是我的代码：
AndroidManifest.xml中
<!-- [START gcm_receiver] -->
<receiver
android:name="com.google.android.gms.gcm.GcmReceiver"
android:exported="true"
android:permission="com.google.android.c2dm.permission.SEND" >
<intent-filter>
<action android:name="com.google.android.c2dm.intent.RECEIVE" />
<category android:name="com.example.airwyntin.notificationtest" />
</intent-filter>
</receiver>
<!-- [END gcm_receiver] -->
<!-- [START gcm_listener] -->
<service
android:name=".MyGcmListenerService"
android:exported="false" >
<intent-filter>
<action android:name="com.google.android.c2dm.intent.RECEIVE" />
</intent-filter>
</service>
<!-- [END gcm_listener] -->
<!-- [START instanceId_listener] -->
<service
android:name=".MyInstanceIDListenerService"
android:exported="false">
<intent-filter>
<action android:name="com.google.android.gms.iid.InstanceID"/>
</intent-filter>
</service>
<!-- [END instanceId_listener] -->
<service
android:name=".RegistrationIntentService"
android:exported="false">
</service>
my GC么listener service.Java:
public class MyGcmListenerService extends GcmListenerService {
private static int notifId = 0;
private static final String TAG = "MyGcmListenerService";
/**
* Called when message is received.
*
* @param from SenderID of the sender.
* @param data Data bundle containing message data as key/value pairs.
* For Set of keys use data.keySet().
*/
// [START receive_message]
@Override
public void onMessageReceived(String from, Bundle data) {
String message = data.getString("alert");
Log.i(TAG, "From: " + from);
if (message != null) {
Log.d(TAG, "From: " + from);
Log.d(TAG, "Message: " + message);
if (from.startsWith("/topics/")) {
// message received from some topic.
} else {
// normal downstream message.
}
// [START_EXCLUDE]
/**
* Production applications would usually process the message here.
* Eg: - Syncing with server.
* - Store message in local database.
* - Update UI.
*/
/**
* In some cases it may be useful to show a notification indicating to the user
* that a message was received.
*/
sendNotification(message);
// [END_EXCLUDE]
}
}
// [END receive_message]
/**
* Create and show a simple notification containing the received GCM message.
*
* @param message GCM message received.
*/
private void sendNotification(String message) {
Intent intent = new Intent(this, NotificationView.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */, intent,
PendingIntent.FLAG_ONE_SHOT);
Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
.setSmallIcon(R.mipmap.ic_launcher)
.setContentTitle("GCM Tesst Message")
.setContentText(message)
.setAutoCancel(true)
.setSound(defaultSoundUri)
.setContentIntent(pendingIntent);
//Vibration
notificationBuilder.setVibrate(new long[] { 0, 200, 200, 200, 200, 200 });
//LED
//notificationBuilder.setLights(Color.RED, 3000, 3000);
NotificationManager notificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
Notification notif = notificationBuilder.build();
notif.flags |= Notification.FLAG_AUTO_CANCEL;
/*notif.ledARGB = 0xFFff0000;
notif.flags = Notification.FLAG_SHOW_LIGHTS;
notif.ledOnMS = 100;
notif.ledOffMS = 100;*/
notificationManager.notify(notifId++ /* ID of notification */, notif);
}
}
my instance ID listener service.Java:
public class MyInstanceIDListenerService extends InstanceIDListenerService {
private static final String TAG = "MyInstanceIDLS";
/**
* Called if InstanceID token is updated. This may occur if the security of
* the previous token had been compromised. This call is initiated by the
* InstanceID provider.
*/
// [START refresh_token]
@Override
public void onTokenRefresh() {
// Fetch updated Instance ID token and notify our app's server of any changes (if applicable).
Intent intent = new Intent(this, RegistrationIntentService.class);
startService(intent);
}
// [END refresh_token]
}
registration intent service.Java:
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.
// R.string.gcm_defaultSenderId (the Sender ID) is typically derived from google-services.json.
// See https://developers.google.com/cloud-messaging/android/start for details on this file.
// [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);
// 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) {
// 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) throws IOException {
GcmPubSub pubSub = GcmPubSub.getInstance(this);
for (String topic : TOPICS) {
pubSub.subscribe(token, "/topics/" + topic, null);
}
}
// [END subscribe_topics]
}
根据GCM的官方声明，它适用于Google Play服务库，因此请尝试检查您的手机是否安装了Google Play服务的最新更新。有时互联网连接问题会导致网络导致GCM推送通知问题，否则您可以检查如果收件人确实收到了邮件，则收货。但是你说当应用程序不在前台时GCM无法正常工作是不正确的
当用户强行关闭应用程序时：通知不会到达
这是Android平台的一个功能。用户强制停止应用程序会使应用程序处于停止状态，并且不会运行任何代码，包括在broadcast receivers中声明的任何manifest。只有当用户明确启动应用程序时，它才处于接收器被触发的状态。
有关Force Stop的更多文档，请点击以下链接：
解决此问题的一个简单方法是，“在构建通知时将优先级设置为高”。优先级常数在-2到2（从最低到最高）的范围内变化，0是此字段的默认值。希望这会有所帮助。谢谢。