Divided the code into functional modules

Models/HeartRateSessionData.cs

@@ -0,0 +1,143 @@
+using System.Collections.Generic;
+using System.Linq;
+
+namespace HeartRateMonitorAndroid.Models
+{
+    /// <summary>
+    /// 心率会话数据，包含一次监测会话的所有数据和统计信息
+    /// </summary>
+    public class HeartRateSessionData
+    {
+        private readonly object _heartRateDataLock = new object(); // 线程安全操作的锁对象
+        private List<HeartRateDataPoint> _heartRateData = new List<HeartRateDataPoint>();
+
+        /// <summary>
+        /// 会话开始时间
+        /// </summary>
+        public DateTime SessionStartTime { get; private set; }
+
+        /// <summary>
+        /// 最新心率值
+        /// </summary>
+        public int LatestHeartRate { get; private set; }
+
+        /// <summary>
+        /// 最小心率值
+        /// </summary>
+        public int MinHeartRate { get; private set; }
+
+        /// <summary>
+        /// 最大心率值
+        /// </summary>
+        public int MaxHeartRate { get; private set; }
+
+        /// <summary>
+        /// 平均心率值
+        /// </summary>
+        public double AverageHeartRate { get; private set; }
+
+        /// <summary>
+        /// 获取心率数据点列表的副本
+        /// </summary>
+        public List<HeartRateDataPoint> HeartRateData 
+        { 
+            get 
+            { 
+                lock (_heartRateDataLock)
+                {
+                    return _heartRateData.ToList();
+                }
+            } 
+        }
+
+        /// <summary>
+        /// 是否有新的心率数据
+        /// </summary>
+        public bool HasNewHeartRateData { get; private set; }
+
+        /// <summary>
+        /// 初始化心率会话数据
+        /// </summary>
+        public HeartRateSessionData()
+        {
+            ResetData();
+        }
+
+        /// <summary>
+        /// 重置会话数据
+        /// </summary>
+        public void ResetData()
+        {
+            lock (_heartRateDataLock)
+            {
+                _heartRateData.Clear();
+                LatestHeartRate = 0;
+                MinHeartRate = 0;
+                MaxHeartRate = 0;
+                AverageHeartRate = 0;
+                HasNewHeartRateData = false;
+            }
+        }
+
+        /// <summary>
+        /// 添加新的心率数据点
+        /// </summary>
+        /// <param name="heartRate">心率值</param>
+        public void AddHeartRate(int heartRate)
+        {
+            lock (_heartRateDataLock)
+            {
+                // 添加新的数据点
+                var dataPoint = new HeartRateDataPoint
+                {
+                    Timestamp = DateTime.Now,
+                    HeartRate = heartRate
+                };
+
+                // 如果是第一个数据点，记录会话开始时间
+                if (_heartRateData.Count == 0)
+                {
+                    SessionStartTime = DateTime.Now;
+                }
+
+                _heartRateData.Add(dataPoint);
+                LatestHeartRate = heartRate;
+
+                // 限制数据点数量，保留最新的100个点
+                if (_heartRateData.Count > 100)
+                {
+                    _heartRateData.RemoveAt(0);
+                }
+
+                // 更新统计信息
+                if (_heartRateData.Count > 0)
+                {
+                    MinHeartRate = _heartRateData.Min(p => p.HeartRate);
+                    MaxHeartRate = _heartRateData.Max(p => p.HeartRate);
+                    AverageHeartRate = _heartRateData.Average(p => p.HeartRate);
+                }
+
+                HasNewHeartRateData = true;
+            }
+        }
+
+        /// <summary>
+        /// 重置新数据标记
+        /// </summary>
+        public void ResetNewDataFlag()
+        {
+            HasNewHeartRateData = false;
+        }
+
+        /// <summary>
+        /// 获取当前会话的监测时长
+        /// </summary>
+        public TimeSpan GetSessionDuration()
+        {
+            if (_heartRateData.Count == 0)
+                return TimeSpan.Zero;
+
+            return DateTime.Now - SessionStartTime;
+        }
+    }
+}