Android 应用上的 FCM + SNS 令牌出错

Question

我遵循了 AWS Mobile Hub 推送集成指南，并在我的应用程序中集成了 AWS SNS 推送服务。当我打开应用程序时，我收到此错误日志：

E/AndroidRuntime: FATAL EXCEPTION: main
                                                             Process: com.intap.appme, PID: 23576
                                                             java.lang.RuntimeException: Unable to start activity ComponentInfo{com.intap.name/com.intap.name.MainActivity}: com.amazonaws.AmazonServiceException: 1 validation error detected: Value null at 'token' failed to satisfy constraint: Member must not be null (Service: AmazonSNS; Status Code: 400; Error Code: ValidationError; Request ID: 21d6a3b2-0459-513a-bf7a-f3c1d99d41ac)
                                                                 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3253)
                                                                 at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3349)
                                                                 at android.app.ActivityThread.access$1100(ActivityThread.java:221)
                                                                 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
                                                                 at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                 at android.os.Looper.loop(Looper.java:158)
                                                                 at android.app.ActivityThread.main(ActivityThread.java:7224)
                                                                 at java.lang.reflect.Method.invoke(Native Method)
                                                                 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
                                                                 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
                                                              Caused by: com.amazonaws.AmazonServiceException: 1 validation error detected: Value null at 'token' failed to satisfy constraint: Member must not be null (Service: AmazonSNS; Status Code: 400; Error Code: ValidationError; Request ID: 21d6a3b2-0459-513a-bf7a-f3c1d99d41ac)
                                                                 at com.amazonaws.http.AmazonHttpClient.handleErrorResponse(AmazonHttpClient.java:712)
                                                                 at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:388)
                                                                 at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:199)
                                                                 at com.amazonaws.services.sns.AmazonSNSClient.invoke(AmazonSNSClient.java:2262)
                                                                 at com.amazonaws.services.sns.AmazonSNSClient.createPlatformEndpoint(AmazonSNSClient.java:447)
                                                                 at com.amazonaws.mobile.push.PushManager.subscribeToTopic(PushManager.java:264)
                                                                 at com.intap.name.MainActivity.onCreate(MainActivity.java:50)
                                                                 at android.app.Activity.performCreate(Activity.java:6876)
                                                                 at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1135)
                                                                 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3206)
                                                                 at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3349) 
                                                                 at android.app.ActivityThread.access$1100(ActivityThread.java:221) 
                                                                 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794) 
                                                                 at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                                 at android.os.Looper.loop(Looper.java:158) 
                                                                 at android.app.ActivityThread.main(ActivityThread.java:7224) 
                                                                 at java.lang.reflect.Method.invoke(Native Method) 
                                                                 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
                                                                 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120) 

应用程序中提到的代码行是这些行：
PushManager.java:264（整个方法）

public void subscribeToTopic(final SnsTopic topic) {
    final CreatePlatformEndpointRequest endpointRequest = new CreatePlatformEndpointRequest();
    endpointRequest.setPlatformApplicationArn(platformApplicationArn);
    try {
        endpointRequest.setToken(InstanceID.getInstance(context).getToken(sharedPreferences.getString("deviceToken", ""), GoogleCloudMessaging.INSTANCE_ID_SCOPE));
    } catch (IOException e) {
        Log.e("Error", e.getMessage());
    }
    /* This is line 264 -> */ final CreatePlatformEndpointResult endpointResult = sns.createPlatformEndpoint(endpointRequest);

    final SubscribeRequest request = new SubscribeRequest();
    request.setEndpoint(endpointResult.getEndpointArn());
    request.setTopicArn(topic.getTopicArn());
    request.setProtocol(SNS_PROTOCOL_APPLICATION);
    final SubscribeResult result = sns.subscribe(request);

    // update topic and save subscription in shared preferences
    final String subscriptionArn = result.getSubscriptionArn();
    topic.setSubscriptionArn(subscriptionArn);
    sharedPreferences.edit().putString(topic.getTopicArn(), subscriptionArn).apply();
}

MainActivity.java:50

pushManager.subscribeToTopic(pushManager.getDefaultTopic());

当我尝试通过在线 Firebase 控制台发送推送消息时，设备会收到推送消息，当我单击消息打开应用程序时，它一直在崩溃。

当我尝试通过在线 SNS 控制台发送推送消息时，我没有收到任何推送通知，这意味着错误在于注册到 SNS。

我该如何解决？我不知道...

Answer 1

令牌从 Google 的 SDK 返回为 null。原因在于这一行：

endpointRequest.setToken(InstanceID.getInstance(context)
    .getToken(sharedPreferences.getString("deviceToken", ""),
       GoogleCloudMessaging.INSTANCE_ID_SCOPE));

getToken() 的第一个参数应该是 GCM 发件人 ID，而不是从 sharedPreferences 中提取的设备令牌。如下更改您的代码以传递发件人 ID，应该可以解决问题：

endpointRequest.setToken(InstanceID.getInstance(context)
    .getToken(gcmSenderID, GoogleCloudMessaging.INSTANCE_ID_SCOPE));

此外，您粘贴的代码似乎是从相当遥远的过去生成的 Mobile Hub 项目修改的。从那时起，PushManager 有了改进。 Mobile Hub 生成的最新版本将使用 GCMTokenHelper 类，该类不存在于您粘贴的代码中。请尝试再次使用 Mobile Hub 生成示例应用程序或 SDK，并更新您的应用程序以使用最近生成的代码，如果您仍然遇到问题，请报告。