Android GCM 正在向服务器发送令牌

Android GCM Sending token to server

GCM Sample Project 给出了一个向您的服务器发送 GCM 令牌的简单示例:

public class RegistrationIntentService extends IntentService {

    ...

    @Override
    protected void onHandleIntent(Intent intent) {
        try {
            ...
            String token = instanceID.getToken(getString(R.string.gcm_defaultSenderId),
                    GoogleCloudMessaging.INSTANCE_ID_SCOPE, null);

            Log.i(TAG, "GCM Registration Token: " + token);

            // TODO: Implement this method to send any registration to your app's servers.
            sendRegistrationToServer(token);
            ...
        } catch (Exception e) {
            ...
        }
    }

    /**
     * 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.
    }
}

但是这是在 IntentService 中完成的,onHandleIntent returns 就完成了,对吗?因此,如果启动 http 调用以使用流行的 android-async-http 库发送令牌,我什至看不到我的 onStart 命中:

private void sendRegistrationToServer(String token) {
    post("/devices", params, new AsyncHttpResponseHandler() {
        // TODO: MAKE SURE ONSTART ACTUALLY CALLED TO MAKE SURE REQUEST AT LEAST GOES UPSTREAM EVEN IF I DON'T RECEIVE A CALLBACK SINCE IN INTENTSERVICE
        // IF NOT THEN MIGHT HAVE TO CHANGE THE INTENTSERVICE TO A SERVICE FOR DEVICE REGISTRATION
        @Override
        public void onStart() {
            // not actually using callback because request sent from intentservice
            Log.d("tagzzz", "sending upstream");
        }

        @Override
        public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
            // not actually using callback because request sent from intentservice
        }

        @Override
        public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable error) {
            // not actually using callback because request sent from intentservice
        }
    });
}

我的 http 请求是否会在 onHandleIntent returns 之前向上游发送并完成 IntentService?如果不是,为什么 Google 将此作为将令牌发送到服务器的示例?

Will my http request even be sent upstream before onHandleIntent returns and finishes the IntentService?

鉴于您正在使用名为 "android-async-http" 的库,我假设默认行为是它异步执行 HTTP。不确定 post() 调用是否会在 onHandleIntent() returns 之前完成其工作,但似乎不太可能。

why does Google give this as their example for sending your token to your server?

Google 没有。 Google 有一个存根 sendRegistrationToServer(),如您在第一个代码清单中所见。我不知道有任何使用 "android-async-http" 库的 Google 示例。

决定使用异步机制发送该 HTTP 请求。对于 IntentService 内部来说,这是一个不合适的选择。现在,也许那个库有一个同步选项,在这种情况下你可以切换到那个。否则,对来自 IntentService.

的 HTTP 请求(HttpURLConnection、OkHttp3 等)使用其他同步内容

请注意,Volley 在这里并不是一个很好的选择,因为 Volley 也强烈倾向于异步工作。