问题描述
我正在运行的WhatsApp（我们可以称之为APPX从现在起）的设备A.我去管理应用程序 - 关闭>力，使APPX被关闭，我再也看不到APPX为运行服务
现在，5分钟后，我把从另一个设备的APPX（设备B）到设备中的APPX（我们把它打死了一个）的消息。 这里有2个场景我测试：
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与Android 2.1设备中的：它从来没有收到该消息，因此我们可以说，没有APPX服务得到了重新启动。它仅接收消息，如果手工用户重新启动应用程序。
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采用Android 2.3.6设备答：一些神奇的原因，无论多久它已经从APPX被杀了，只要我们发送消息从设备B - >装置A收到消息，因此， APPX公司的服务被重新启动。注意：所有的APPX被关闭，并没有收到任何通知的时候，我没能看到APPX任何正在运行的服务管理应用程序，所以这意味着，这种神奇的服务得到尽快收到消息/通知重新启动
我知道这听起来有些不可思议，而且很多人会说这是不可能的，但同样，这已经过测试的这两个设备。
我试图做到这一点相同的行为，所以任何帮助将AP preciated吧。
我不认为这是一些神奇这里发生的事情！这只是Android的C2DM（参见： https://developers.google.com/android/c2dm/），而应用程序有一个注册接收传入的推送通知，并得到此消息唤醒。Android的C2DM是/是可利用的Android 2.2系统，这就是为什么你不能看到相同的行为在设备上使用Android 2.1的启动和运行的原因。
顺便说一句：正如你所看到的，C2DM是自6月26日，2012年。因此，而不是C2DM的pcated德$ P $，应使用GCM（见的 http://developer.android.com/guide/google/gcm/gs.html ）
有用的注释：GCM需要提供互联网连接。可以使用任何其他的广播接收器，例如SMSReceiver为通过使此限制。
I am running whatsapp (we could call it appX from now on) in device A. I go to manage applications -> force close so appX gets closed and i no longer see appX as running services.
Now, after 5 minutes, I send a message from another device 's appX (device B) to device A appX (the one we killed it). Here are the 2 scenarios i tested :
device A with android 2.1 : it never receives the message, therefore we could say that none of appX services got restarted. It ONLY receives the message if manually the user restarts the app.
device A with android 2.3.6 : for SOME magic reason, no matter how long it's been since appX got killed, as soon as we send the message from device B -> device A gets the message, therefore, appX's service gets restarted. Note : all the time that appX was closed and WITHOUT receiving any notification, i wasn't able to see any running services of appX in manage applications, so this means that this magic service gets restarted as soon as it receives a message/notification
I know it sounds weird, and lot of people will say this is impossible, but again, this has been tested on these 2 devices.
I am trying to accomplish this same behavior, so any help will be appreciated it.
I don't think it's some magic what happens here! It's just Android C2DM (see: https://developers.google.com/android/c2dm/), whereas the app has a registered Receiver for incoming Push Notifications and gets awaken by this message.Android C2DM is/was available with Android 2.2, that's the reason why you can't see the same behaviour on your device with Android 2.1 up and running.
By the way: As you can see, C2DM is deprecated since June 26th, 2012. So instead of C2DM, one should use GCM (see: http://developer.android.com/guide/google/gcm/gs.html)
Useful Comment: GCM needs available internet connection. You can using any other broadcast receiver such as SMSReceiver for by passing this limitation.
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