如何获取android onNotificationPosted()通知的时间戳

public class MyNotificationListenerService extends NotificationListenerService {
    @Override
    public void onNotificationPosted(StatusBarNotification sbn) {
        super.onNotificationPosted(sbn);
        
        long timestamp = sbn.getPostTime(); // 获取通知的时间戳
        
        // 其他处理逻辑
    }
}

<service
    android:name=".MyNotificationListenerService"
    android:label="Notification Listener"
    android:permission="android.permission.BIND_NOTIFICATION_LISTENER_SERVICE">
    <intent-filter>
        <action android:name="android.service.notification.NotificationListenerService" />
    </intent-filter>
</service>

public class MainActivity extends AppCompatActivity {
    private static final String ENABLED_NOTIFICATION_LISTENERS = "enabled_notification_listeners";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        // 检查是否已经授予通知监听权限
        if (!isNotificationListenerEnabled()) {
            // 请求用户授予通知监听权限
            startActivity(new Intent("android.settings.ACTION_NOTIFICATION_LISTENER_SETTINGS"));
        }
    }

    private boolean isNotificationListenerEnabled() {
        String packageName = getPackageName();
        String flat = Settings.Secure.getString(getContentResolver(), ENABLED_NOTIFICATION_LISTENERS);
        if (!TextUtils.isEmpty(flat)) {
            String[] names = flat.split(":");
            for (String name : names) {
                ComponentName componentName = ComponentName.unflattenFromString(name);
                if (componentName != null && TextUtils.equals(packageName, componentName.getPackageName())) {
                    return true;
                }
            }
        }
        return false;
    }
}