android - 移动后端在后台处理连续查询

Question

我在我的应用程序中使用 Mobile Backend Starter，并且我能够使用此代码持续接收数据:

CloudCallbackHandler<List<CloudEntity>> handler = new CloudCallbackHandler<List<CloudEntity>>() {
        @Override
        public void onComplete(List<CloudEntity> results) {
            Logger.log(MainActivity.this, "onComplete");
        }

        @Override
        public void onError(IOException e) {
            Logger.log(MainActivity.this, e);
        }
    };

    CloudQuery cq = new CloudQuery("Test");
    cq.setLimit(50);
    cq.setSort(CloudEntity.PROP_UPDATED_AT, Order.DESC);
    cq.setScope(Scope.FUTURE_AND_PAST);
    getCloudBackend().list(cq, handler);

当我的应用程序处于 Activity 状态时，这一切工作正常，但我想使用它来通知用户新数据可用，当应用程序不处于 Activity 状态时。

当我关闭应用程序(按返回键，而不是主页)，并强制向我的设备发送消息时，出现以下错误:

07-04 18:30:23.084: I/CloudBackend(31368): error: 
07-04 18:30:23.084: I/CloudBackend(31368): com.google.api.client.googleapis.extensions.android.gms.auth.UserRecoverableAuthIOException
07-04 18:30:23.084: I/CloudBackend(31368):  at com.google.api.client.googleapis.extensions.android.gms.auth.GoogleAccountCredential$RequestHandler.intercept(GoogleAccountCredential.java:222)
07-04 18:30:23.084: I/CloudBackend(31368):  at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:836)
07-04 18:30:23.084: I/CloudBackend(31368):  at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:412)
07-04 18:30:23.084: I/CloudBackend(31368):  at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:345)
07-04 18:30:23.084: I/CloudBackend(31368):  at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:463)
07-04 18:30:23.084: I/CloudBackend(31368):  at com.myapp.cloudbackend.CloudBackend.list(CloudBackend.java:340)
07-04 18:30:23.084: I/CloudBackend(31368):  at com.myapp.cloudbackend.CloudBackendAsync.access$8(CloudBackendAsync.java:1)
07-04 18:30:23.084: I/CloudBackend(31368):  at com.myapp.cloudbackend.CloudBackendAsync$9.callBackend(CloudBackendAsync.java:283)
07-04 18:30:23.084: I/CloudBackend(31368):  at com.myapp.cloudbackend.CloudBackendAsync$9.callBackend(CloudBackendAsync.java:1)
07-04 18:30:23.084: I/CloudBackend(31368):  at com.myapp.cloudbackend.CloudBackendAsync$BackendCaller.run(CloudBackendAsync.java:429)
07-04 18:30:23.084: I/CloudBackend(31368): Caused by: com.google.android.gms.auth.UserRecoverableAuthException: AppDownloadRequired
07-04 18:30:23.084: I/CloudBackend(31368):  at com.google.android.gms.auth.GoogleAuthUtil.getToken(Unknown Source)
07-04 18:30:23.084: I/CloudBackend(31368):  at com.google.android.gms.auth.GoogleAuthUtil.getToken(Unknown Source)
07-04 18:30:23.084: I/CloudBackend(31368):  at com.google.api.client.googleapis.extensions.android.gms.auth.GoogleAccountCredential.getToken(GoogleAccountCredential.java:192)
07-04 18:30:23.084: I/CloudBackend(31368):  at com.google.api.client.googleapis.extensions.android.gms.auth.GoogleAccountCredential$RequestHandler.intercept(GoogleAccountCredential.java:217)
07-04 18:30:23.084: I/CloudBackend(31368):  ... 9 more

我怎样才能实现我想要的？

Answer 1

我没有玩过 Mobile Backend Starter，但您的问题听起来像是您想实现 Service并在服务中使用云后端。因此，您可以在您的应用未激活时建立通信。这是一个 good tutorial .