如何注册Android设备接收通过App Engine后端的推送通知？ [英] How to register android device for receiving Push notifications via App Engine backend?
问题描述
我使用本教程。但在步骤2.4中，我停留在显示来自GCM后端的推送通知。当我调试时，我发现我的RegistrastionRecord中有0个注册的设备。那么，如何使用App Engine本地后端正确注册接收推送通知的应用程序？
我得到这个错误：
无法完成令牌刷新com.google.api.client.googleapis.json.GoogleJsonResponseException：404未找到
< html>< head>< title>错误404< / title>< / head>
< body>< h2>错误404< / h2>< / body>
< / html>
以下是我的注册端点：
<$ p
$ b $ owner $ = myapplication.Mikhail.example.com，
ownerName =backend.myapplication.Mikhail.example.com，
packagePath =
）
）
public类RegistrationEndpoint {
private static final Logger log = Logger.getLogger（RegistrationEndpoint.class.getName（））;
$ b $ / **
*注册一个设备到后端
*
* @param regId Google Cloud Messaging注册ID添加
* /
@ApiMethod（name =register）
public void registerDevice（@Named（regId）String regId）{
if（findRecord（regId）！= null）{
log.info（设备+ regId +已经注册，跳过注册）;
return;
}
RegistrationRecord record = new RegistrationRecord（）;
record.setRegId（regId）;
ofy（）。save（）。entity（record）.now（）;
}
/ **
*从后端取消注册设备
*
* @param regId Google Cloud Messaging注册ID将删除
$ /
@ApiMethod（name =unregister）
public void unregisterDevice（@Named（regId）String regId）{
RegistrationRecord record = findRecord（regId）;
if（record == null）{
log.info（Device+ regId +not registered，skipping unregister）;
return;
ofy（）。delete（）。entity（record）.now（）;
}
/ **
*返回已注册设备的集合
*
* @param count要列出的设备数量
* @返回Google Cloud Messaging注册列表Ids
* /
@ApiMethod（name =listDevices）
public CollectionResponse< RegistrationRecord> listDevices（@Named（count）int count）{
List< RegistrationRecord>记录= ofy（）.load（）.type（RegistrationRecord.class）.limit（count）.list（）;
返回CollectionResponse。< RegistrationRecord> builder（）.setItems（records）.build（）;
$ b $ private注册记录findRecord（String regId）{
return ofy（）。load（）.type（RegistrationRecord.class）.filter（regId，regId）。 。第一（）现在（）;
}
}
这是sendRegistrationToServer（）。我从RegistrationIntentService的onHandleIntent（）中调用它：
private void sendRegistrationToServer（String token）throws IOException {
//根据需要添加自定义实现。
Registration.Builder builder = new Registration.Builder（AndroidHttp.newCompatibleTransport（），$ b $ new AndroidJsonFactory（），null）
//需要setRootUrl和setGoogleClientRequestInitializer仅用于本地测试，
//否则可以跳过
.setRootUrl（http://10.0.2.2:8080/_ah/api/）
.setGoogleClientRequestInitializer（新的GoogleClientRequestInitializer（） {
@Override
public void initialize（AbstractGoogleClientRequest<> abstract>> abstractGoogleClientRequest）
throws IOException {
abstractGoogleClientRequest.setDisableGZipContent（true）;
}
} ）;
注册regService = builder.build（）;
regService.register（token）.execute（）;
//regService.register（token）.execute（）;
}
很长时间。在我将所有库升级到最新版本之后，它对我来说工作得很好。
插件：
classpath'com.google.appengine：gradle-appengine-plugin：1.9.34'
库：
ext {
appEngineVersion ='1.9.38'
}
相关性{
appengineSdkcom.google.appengine：appengine-java-sdk：$ {appEngineVersion}
compilecom.google.appengine：appengine-endpoints：$ {appEngineVersion}
编译com.google.appengine：appengine-endpoints-deps：$ {appEngineVersion}
...
}
希望这会有帮助。
I have created the sample android project with Android app and App Engine as a backend using this tutorial. But on the step 2.4, I am stuck in showing push notifications from GCM backend. When I debug, I found that there are 0 registered device in my RegistrastionRecord. So, how to correctly register the app for receiving push notifications using App Engine local backend?
I got this error:
Failed to complete token refresh com.google.api.client.googleapis.json.GoogleJsonResponseException: 404 Not Found
<html><head><title>Error 404</title></head>
<body><h2>Error 404</h2></body>
</html>
Here is my Registration Endpoint:
@Api(
name = "registration",
version = "v1",
namespace = @ApiNamespace(
ownerDomain = "backend.myapplication.Mikhail.example.com",
ownerName = "backend.myapplication.Mikhail.example.com",
packagePath=""
)
)
public class RegistrationEndpoint {
private static final Logger log = Logger.getLogger(RegistrationEndpoint.class.getName());
/**
* Register a device to the backend
*
* @param regId The Google Cloud Messaging registration Id to add
*/
@ApiMethod(name = "register")
public void registerDevice(@Named("regId") String regId) {
if (findRecord(regId) != null) {
log.info("Device " + regId + " already registered, skipping register");
return;
}
RegistrationRecord record = new RegistrationRecord();
record.setRegId(regId);
ofy().save().entity(record).now();
}
/**
* Unregister a device from the backend
*
* @param regId The Google Cloud Messaging registration Id to remove
*/
@ApiMethod(name = "unregister")
public void unregisterDevice(@Named("regId") String regId) {
RegistrationRecord record = findRecord(regId);
if (record == null) {
log.info("Device " + regId + " not registered, skipping unregister");
return;
}
ofy().delete().entity(record).now();
}
/**
* Return a collection of registered devices
*
* @param count The number of devices to list
* @return a list of Google Cloud Messaging registration Ids
*/
@ApiMethod(name = "listDevices")
public CollectionResponse<RegistrationRecord> listDevices(@Named("count") int count) {
List<RegistrationRecord> records = ofy().load().type(RegistrationRecord.class).limit(count).list();
return CollectionResponse.<RegistrationRecord>builder().setItems(records).build();
}
private RegistrationRecord findRecord(String regId) {
return ofy().load().type(RegistrationRecord.class).filter("regId", regId).first().now();
}
}
Here is the sendRegistrationToServer(). I call it from onHandleIntent() from RegistrationIntentService:
private void sendRegistrationToServer(String token) throws IOException {
// Add custom implementation, as needed.
Registration.Builder builder = new Registration.Builder(AndroidHttp.newCompatibleTransport(),
new AndroidJsonFactory(), null)
// Need setRootUrl and setGoogleClientRequestInitializer only for local testing,
// otherwise they can be skipped
.setRootUrl("http://10.0.2.2:8080/_ah/api/")
.setGoogleClientRequestInitializer(new GoogleClientRequestInitializer() {
@Override
public void initialize(AbstractGoogleClientRequest<?> abstractGoogleClientRequest)
throws IOException {
abstractGoogleClientRequest.setDisableGZipContent(true);
}
});
Registration regService = builder.build();
regService.register(token).execute();
//regService.register(token).execute();
}
I used to have this problem for long. After I upgrade the plugin all libraries to the latest version, it works so fine for me.
Plugin:
classpath 'com.google.appengine:gradle-appengine-plugin:1.9.34'
Libraries:
ext {
appEngineVersion = '1.9.38'
}
dependencies {
appengineSdk "com.google.appengine:appengine-java-sdk:${appEngineVersion}"
compile "com.google.appengine:appengine-endpoints:${appEngineVersion}"
compile "com.google.appengine:appengine-endpoints-deps:${appEngineVersion}"
...
}
Hope this will help.
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