我正在尝试注册我的Android设备以接收推送通知，但是亚马逊服务器返回错误，提示它找不到我的PlatformApplicationArn。我正在使用他们的SDK设置它，但似乎找不到它。
这是错误：AWS错误消息：无效的参数：PlatformApplicationArn原因：所需参数没有值
这是发送它的代码：
String platformApplicationArn = "arn:aws:sns:us-east-1:897955111111:app/GCM/com.myapp";
AWSCredentials awsCredentials = new BasicAWSCredentials("XXXXXXXX", "XXXXXXXXXXXXXXXXXXXXX");
pushClient = new AmazonSNSClient(awsCredentials);
CreatePlatformEndpointRequest createPlatformEndpointRequest = new CreatePlatformEndpointRequest();
String customPushData = "my custom data";
CreatePlatformEndpointRequest platformEndpointRequest = new CreatePlatformEndpointRequest();
platformEndpointRequest.setCustomUserData(customPushData);
platformEndpointRequest.setToken(pushNotificationRegId);
platformEndpointRequest.setPlatformApplicationArn(platformApplicationArn);
CreatePlatformEndpointResult result = pushClient.createPlatformEndpoint(createPlatformEndpointRequest);
您有2个实例，CreatePlatformEndpointRequest并且要在一个实例上设置令牌和applicationArn，但是将另一个实例用于SNSClient请求，因此它缺少必需的参数。
String platformApplicationArn = "arn:aws:sns:us-east-1:897955111111:app/GCM/com.myapp";
AWSCredentials awsCredentials = new BasicAWSCredentials("XXXXXXXX", "XXXXXXXXXXXXXXXXXXXXX");
AmazonSNSClient pushClient = new AmazonSNSClient(awsCredentials);
//probably no need for this
String customPushData = "my custom data";
CreatePlatformEndpointRequest platformEndpointRequest = new CreatePlatformEndpointRequest();
platformEndpointRequest.setCustomUserData(customPushData);
platformEndpointRequest.setToken(pushNotificationRegId);
platformEndpointRequest.setPlatformApplicationArn(platformApplicationArn);
CreatePlatformEndpointResult result = pushClient.createPlatformEndpoint(platformEndpointRequest);
另外，除非您的SNS应用程序地区是US_EAST_1，否则我发现您必须手动设置地区，否则您将收到不匹配的地区错误响应，因此在调用之前，createPlatformEndpoint()请按照以下步骤设置您的地区：
//Replace with whatever region your app is
pushClient.setRegion(Region.getRegion(Regions.US_WEST_2));
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