Android：如何检查用户日期是否有效

问题描述：

我知道有很多与此相关的问题，但它们似乎都无法解决我的问题。
我想检查用户设备上的日期是否正确，启动一个活动，但是如果用户设备上的日期不正确，它应该显示一个错误活动，要求用户仅调整其日期像whatsapp如何实施他们的应用程序。

I know there are a lot of questions asked that are related to this but they all seems not to solve my problem. I want to check if the date on the user's device is correct, start an activity but in a case where the date on the users device is wrong, it should show an error activity that asks the user to adjust their date just like how whatsapp implemented theirs..

答

您必须具有服务器的时间戳，才能确定设备中的时间是否为假。
Npt池是一项免费服务，可帮助您获得真实的时间戳。

要使用，设备必须在线，您必须在没有Internet的情况下进行检查。

将类 SntpClient 复制到您的项目中： https://android.googlesource.com/platform/frameworks/base/+ /master/core/java/android/net/SntpClient.java

You must have server's timestamps to determine if the time in device is fake. Npt pool is a free service to help you get true timestamps.
To use, device must ONLINE, you can not check without the Internet.
Copy class SntpClient to your project: https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/net/SntpClient.java

代码：

SntpClient client = new SntpClient();
long now = -1;
if (client.requestTime("pool.ntp.org", TIME_OUT)) {              
      now = client.getNtpTime();
      if (Math.abs(now - System.currentTimeMillis())    >= ONE_DAY){ 
           // the device's time is wrong
           startErrorActivity();
           ...
      } else {
           // the different time lower than 1 day
           startNextActivity();
      }
} else {
      // something wrong, can't get server's time          
}

别忘了在清单中添加 INTERNET 权限

Don't forget add INTERNET permission to your manifest

Android：如何检查用户日期是否有效

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