如何使用谷歌应用程序引擎作为后端数据库的Android应用程序 [英] How to use the Google App Engine as a backend database for Android applications
问题描述
我其实在android的初学者，需要很多帮助。我与嵌入式数据库的应用程序，现在希望把它放到一些动态位置。有数据的简单形式（有的地址和分支信息等）。其实，我不知道如何使用放在动态位置动态服务器。
I'm actually a beginner in android and needs a lot of help. I have made an app with embedded database and now want to put it onto some dynamic location. Have simple form of data (some addresses and branch information etc). I actually have no idea about how to use a dynamic server placed on dynamic location.
我怎样才能做到这一点？请指引我逐步
How can I do this? Please guide me stepwise
我浏览，发现了一些像编写服务，关闭/打开后端等，请不要引导我。另一个问题，我有是：我需要某种形式的注册，API密钥或任何其他东西的。我只是说谷歌插件的日食，我可以创建应用引擎和Android应用程序连接
I browsed and found some terms like "write Service", "Close/open back-ends" etc. Kindly do guide me. Another question that I have is: do I need some kind of registration, api-key or any other thing. I just added the "google plugins" for eclipse and I can create App engine connected with Android App
推荐答案
是的，你确实需要一个密钥。看看这个<一href="http://developer.android.com/google/gcm/gs.html">http://developer.android.com/google/gcm/gs.html
Yes you do need a key. Look at this http://developer.android.com/google/gcm/gs.html
首先，我们需要将数据从客户端作为您设置的例子（的应用引擎，Android应用程序连接）
First, we need to send data to/from the client for the example you set up (App engine connected with Android App) using
com.google.android.gcm.server.Sender helper class
此外，该助手类第4步，以及如何使用它在编写服务器机端应用程序服务器端应用程序
当然，你要坚持，或查找数据。您可以做，在任何类用于发送/接收邮件（当然，它使用上述发件人辅助类）
Naturally then you want to persist or look up data. You can do that in the whatever class is used to send/receive messages (which of course uses the Sender helper class above)
的AppEngine上，如果你使用的是Java那么最简单的，也许最好的办法是用客观化。的相信我，或谷歌它，看看它有多好。 <一href="https://$c$c.google.com/p/objectify-appengine/">https://$c$c.google.com/p/objectify-appengine/
Then the easiest and maybe best way for AppEngine if you are using Java is to use Objectify. Trust me or google it to see how good it is. https://code.google.com/p/objectify-appengine/
该文档的客体是非常好，我真的没有任何麻烦的第一次。
The docs for Objectify are really good and I didn't really have any trouble the first times.
他们简单的例子是：
@Entity
class Car {
@Id String vin; // Can be Long, long, or String
String color;
}
ofy().save().entity(new Car("123123", "red")).now();
Car c = ofy().load().type(Car.class).id("123123").get();
ofy().delete().entity(c);
我觉得你是好去。
I think you are good to go.
摘要：
-
YourMessageClass（上AppEngine上）
YourMessageClass (on Appengine)
- 使用com.google.android.gcm.server.Sender发送/接受她的数据。
-- uses com.google.android.gcm.server.Sender to send/recieve data
- 使用物化坚持数据
-- uses Objectify to persist data.
接下来的问题是，你在哪里把YourMessageClass。会不会是正在处理一个短命的请求一个Servlet？ （<一href="https://developers.google.com/appengine/docs/java/runtime#Requests_and_Servlets">https://developers.google.com/appengine/docs/java/runtime#Requests_and_Servlets)会不会是一个长期运行的后台？（<一href="https://developers.google.com/appengine/docs/java/backends/">https://developers.google.com/appengine/docs/java/backends/)但这超出了本文的讨论范围之内。
The next question is where are you putting YourMessageClass. Will it be in a Servlet that is handling a short-lived request? (https://developers.google.com/appengine/docs/java/runtime#Requests_and_Servlets) Will it be in a long-running backend? (https://developers.google.com/appengine/docs/java/backends/) but that is beyond the scope of this discussion.
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