feat: 开始计重 calc vol

module_gjc/src/main/java/com/lukouguoji/gjc/viewModel/GjcWeighingStartViewModel.kt

@@ -86,6 +86,18 @@ class GjcWeighingStartViewModel : BaseViewModel() {
             diBangModel.key = it ?: ""
         }
 
+        // 监听运抵重量变化，自动计算运抵体积
+        arriveWeight.observe(activity as LifecycleOwner) { weightStr ->
+            // 将字符串转换为 Double，如果转换失败或为空则使用 0.0
+            val weight = weightStr?.toDoubleOrNull() ?: 0.0
+
+            // 计算体积：运抵体积 = 运抵重量 / 220
+            val volume = if (weight > 0) weight / 220.0 else 0.0
+
+            // 格式化为两位小数并更新 LiveData
+            arriveVolume.value = String.format("%.2f", volume)
+        }
+
         // 加载下拉列表数据
         loadChannelList()
         loadAgentList()