# 查看生命周期规则
![](https://support.huaweicloud.com/sdk-android-devg-obs/public_sys-resources/notice_3.0-zh-cn.png)
开发过程中，您有任何问题可以在github上[提交issue](https://github.com/huaweicloud/huaweicloud-sdk-java-obs/issues)，或者在[华为云对象存储服务论坛](https://bbs.huaweicloud.com/forum/forum-620-1.html)中发帖求助。[接口参考文档](https://obssdk.obs.cn-north-1.myhuaweicloud.com/apidoc/cn/android/index.html)详细介绍了每个接口的参数和使用方法。
您可以通过ObsClient.getBucketLifecycle查看桶的生命周期规则。
本示例用于查看桶名为"bucketname"的生命周期规则。
代码示例如下所示:
```
// 认证用的ak和sk硬编码到代码中或者明文存储都有很大的安全风险，建议在配置文件或者环境变量中密文存放，使用时解密，确保安全；本示例以ak和sk保存在环境变量中为例，运行本示例前请先在本地环境中设置环境变量ACCESS_KEY_ID和SECRET_ACCESS_KEY_ID。
// 您可以登录访问管理控制台获取访问密钥AK/SK，获取方式请参见https://support.huaweicloud.com/usermanual-ca/ca_01_0003.html
String ak = System.getenv("ACCESS_KEY_ID");
String sk = System.getenv("SECRET_ACCESS_KEY_ID");
String endPoint = "https://your-endpoint";
// 创建ObsClient实例
ObsClient obsClient = new ObsClient(ak, sk, endPoint);
LifecycleConfiguration config = obsClient.getBucketLifecycle("bucketname");
for (LifecycleConfiguration.Rule rule : config.getRules()) {
    Log.i("GetBucketLifecycleConfiguration",rule.getId());
    Log.i("GetBucketLifecycleConfiguration",rule.getPrefix());
    for(LifecycleConfiguration.Transition transition : rule.getTransitions()){
        Log.i("GetBucketLifecycleConfiguration",String.valueOf(transition.getDays()));
        Log.i("GetBucketLifecycleConfiguration",transition.getStorageClass());
    }
    Log.i("GetBucketLifecycleConfiguration",rule.getExpiration() != null ? String.valueOf(rule.getExpiration().getDays()) : "");
    for(LifecycleConfiguration.NoncurrentVersionTransition noncurrentVersionTransition : rule.getNoncurrentVersionTransitions()){
        Log.i("GetBucketLifecycleConfiguration",String.valueOf(noncurrentVersionTransition.getDays()));
        Log.i("GetBucketLifecycleConfiguration",noncurrentVersionTransition.getStorageClass());
    }
    Log.i("GetBucketLifecycleConfiguration",rule.getNoncurrentVersionExpiration() != null ?String.valueOf(rule.getNoncurrentVersionExpiration().getDays()) : "");
}
```
![](https://support.huaweicloud.com/sdk-android-devg-obs/public_sys-resources/note_3.0-zh-cn.png)
查看生命周期规则过程中返回的错误码含义、问题原因及处理措施可参考[SDK错误码](https://support.huaweicloud.com/sdk-android-devg-obs/obs_26_1608.html)。