refactor(activity): 优化启动页跳转延迟及子设备页面稳定性，修复导航栏闪烁问题

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/src/main/java/com/shuwei/dish/match/utils/WeightUtil.kt

@@ -7,6 +7,7 @@ import android.util.Log
 import com.shuwei.dish.match.utils.ext.roundedOneDecimalPlace
 //import com.aithings.Weigher
 import com.wabon.wbintelligenthardwaresdk.api.SensorScale
+import java.util.concurrent.ConcurrentHashMap
 
 typealias WeightCallback = (address: Int, state: Int, weight: Double) -> Unit
 
@@ -17,8 +18,7 @@ object WeightUtil {
     const val STATE_OVER_WEIGHT = SensorScale.STATE_OVER_WEIGHT
 
     var isConnected = false
-    var weightFuncMap: MutableMap<String, WeightCallback?>? =
-        null
+    val weightFuncMap: ConcurrentHashMap<String, WeightCallback?> = ConcurrentHashMap()
 
     fun init() {
         Weigher2.init()
@@ -38,7 +38,7 @@ object WeightUtil {
                 }
                 val useWeight = (weight*1000).roundedOneDecimalPlace()
                 Log.d(TAG, "readWeight, address=$address,state=$stateStr, weight=$useWeight")
-                weightFuncMap?.forEach { (key, value) ->
+                weightFuncMap.forEach { (key, value) ->
                     value?.invoke(address, state, useWeight)
                 }
 
@@ -82,18 +82,15 @@ object WeightUtil {
         }
     }
 
-    fun removeWeightListener(weightKey: String){
-        weightFuncMap?.remove(weightKey)
+    fun removeWeightListener(weightKey: String) {
+        weightFuncMap.remove(weightKey)
     }
 
     fun addWeightListener(
         weightKey: String,
         getWeight: WeightCallback = { _, _, _ -> }
     ) {
-        if (weightFuncMap == null) {
-            weightFuncMap = mutableMapOf()
-        }
-        weightFuncMap?.put(weightKey, getWeight)
+        weightFuncMap[weightKey] = getWeight
     }
 }