fix(global): 将秤生命周期提升至进程级，修复子设备空白页和秤停止响应问题

- WeightUtil 初始化移至 BaseApp.onCreate()，通过 ActivityLifecycleCallbacks
  在最后一个 Activity 销毁时才调用 stopContinuousRead()
- InitActivity 删除 WeightUtil 的初始化/停止调用
- startNextPage() 跳转完成后执行 finish()，防止 InitActivity 残留任务栈
  导致返回时出现空白页，及被系统回收时触发 onDestroy 意外停止秤读取

app/src/main/java/com/shuwei/dish/match/base/BaseApp.kt

@@ -1,10 +1,12 @@
 package com.shuwei.dish.match.base
 
+import android.app.Activity
 import android.app.Application
 import android.content.Context
 import android.content.Intent
 import android.content.IntentFilter
 import android.content.SharedPreferences
+import android.os.Bundle
 import android.util.Log
 import com.shuwei.dish.match.R
 import com.shuwei.dish.match.db.DatabaseProvider
@@ -15,6 +17,7 @@ import com.shuwei.dish.match.utils.AppUtil
 import com.shuwei.dish.match.utils.SpTool
 import com.shuwei.dish.match.utils.BootReceiver
 import com.shuwei.dish.match.utils.CrashHandler
+import com.shuwei.dish.match.utils.WeightUtil
 import com.shuwei.dish.match.utils.Weigher2
 
 
@@ -57,6 +60,26 @@ class BaseApp : Application() {
 
         // 启动秤服务（主设备多启动发现+聚合，子设备只启动服务端+注册）
         ScaleServiceManager.start(this)
+
+        // 初始化秤，进程级生命周期管理：最后一个 Activity 销毁时才停止读取
+        WeightUtil.init()
+        WeightUtil.getWeight()
+        WeightUtil.startContinuousRead()
+        registerActivityLifecycleCallbacks(object : ActivityLifecycleCallbacks {
+            private var activityCount = 0
+            override fun onActivityCreated(a: Activity, b: Bundle?) { activityCount++ }
+            override fun onActivityDestroyed(a: Activity) {
+                if (--activityCount <= 0) {
+                    WeightUtil.stopContinuousRead()
+                }
+            }
+            override fun onActivityStarted(a: Activity) {}
+            override fun onActivityResumed(a: Activity) {}
+            override fun onActivityPaused(a: Activity) {}
+            override fun onActivityStopped(a: Activity) {}
+            override fun onActivitySaveInstanceState(a: Activity, b: Bundle) {}
+        })
+
 //        GlobalData.deviceId = "39a7abdd06b3c7ab"
         val filter = IntentFilter(Intent.ACTION_BOOT_COMPLETED)
         registerReceiver(BootReceiver(), filter)

app/src/main/java/com/shuwei/dish/match/ui/InitActivity.kt

@@ -20,7 +20,6 @@ import com.shuwei.dish.match.utils.AddressUtil
 import com.shuwei.dish.match.utils.AppUtil
 import com.shuwei.dish.match.utils.NetworkUtils
 import com.shuwei.dish.match.utils.SpTool
-import com.shuwei.dish.match.utils.WeightUtil
 import com.shuwei.dish.match.utils.ext.gone
 import com.shuwei.dish.match.utils.ext.startActivity
 import com.shuwei.dish.match.utils.ext.visible
@@ -82,12 +81,6 @@ class InitActivity : BaseActivity() {
 
         BaseApp.canteenId = SpTool.canteenId
 
-        WeightUtil.init()
-        WeightUtil.getWeight()
-        WeightUtil.startContinuousRead()
-        //对净材秤1和熟食秤2称进行清零
-        //WeightUtil.tareTwo(AddressUtil.ONE)
-        //WeightUtil.tareTwo(AddressUtil.TWO)
         initViews()
     }
 
@@ -100,6 +93,7 @@ class InitActivity : BaseActivity() {
             // 子设备：直接进入小屏专属页面，不走原有大屏业务流程
             if (GlobalData.deviceRole == DeviceRole.SLAVE) {
                 startActivity<SlaveActivity>()
+                finish()
                 return@launch
             }
             // 主设备：走原有路由逻辑
@@ -116,6 +110,7 @@ class InitActivity : BaseActivity() {
                     startActivity<HomeActivity>()
                 }
             }
+            finish()
         }
     }
 
@@ -142,9 +137,6 @@ class InitActivity : BaseActivity() {
 
     override fun onDestroy() {
         countdownHandler.removeCallbacksAndMessages(null)
-        WeightUtil.stopContinuousRead()
-        // 秤服务伴随进程生命周期，无需在 Activity 销毁时停止；进程退出时 OS 会自动回收所有资源
-        // ScaleServiceManager.stop()
         super.onDestroy()
     }