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/ui/InitActivity.kt

@@ -2,6 +2,7 @@ package com.shuwei.dish.match.ui
 
 import android.annotation.SuppressLint
 import android.content.Intent
+import android.util.Log
 import android.graphics.Color
 import android.os.Bundle
 import android.os.SystemClock
@@ -26,7 +27,6 @@ import com.shuwei.dish.match.utils.ext.startActivity
 import com.shuwei.dish.match.viewmodel.AppViewModel
 import com.shuwei.dish.match.viewmodel.factory.AppFactory
 import kotlinx.coroutines.delay
-import kotlinx.coroutines.flow.flow
 import kotlinx.coroutines.launch
 
 class InitActivity : BaseActivity() {
@@ -63,8 +63,9 @@ class InitActivity : BaseActivity() {
         WeightUtil.startContinuousRead()
 
         initViews()
-
-//        countDown()
+        val dpi = resources.displayMetrics.density
+        val metrics = resources.displayMetrics.toString()
+        Log.d(TAG, "dpi=$dpi, $metrics")
     }
 
     private fun initViewModel() {
@@ -74,24 +75,27 @@ class InitActivity : BaseActivity() {
     }
 
     private fun startNextPage() {
-        // 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>()
-            return
-        }
-        // 主设备：走原有路由逻辑
-        val launchPageType = SpTool.getInt(SpTool.LAUNCH_PAGE_TYPE, -1)
-        when (launchPageType) {
-            0 -> {
-                startActivity<SelectDishActivity>()
+        lifecycleScope.launch {
+            delay(2000)
+            // 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>()
+                return@launch
             }
+            // 主设备：走原有路由逻辑
+            val launchPageType = SpTool.getInt(SpTool.LAUNCH_PAGE_TYPE, -1)
+            when (launchPageType) {
+                0 -> {
+                    startActivity<SelectDishActivity>()
+                }
 
-            1 -> {
-                goSampling()
-            }
+                1 -> {
+                    goSampling()
+                }
 
-            else -> {
-                startActivity<HomeActivity>()
+                else -> {
+                    startActivity<HomeActivity>()
+                }
             }
         }
     }
@@ -117,25 +121,6 @@ class InitActivity : BaseActivity() {
         }
     }
 
-    private fun countDown() {
-        lifecycleScope.launch {
-            flow {
-                (2 downTo 1).forEach {
-                    delay(1000)
-                    emit(it)
-                }
-            }.collect {
-                // 倒计时结束执行跳转
-                if (it == 1) {
-                    startNextPage()
-                    //保留初始化页面，不关闭
-//                    finish()
-                }
-            }
-        }
-    }
-
-
     override fun onDestroy() {
         WeightUtil.stopContinuousRead()
         super.onDestroy()
@@ -257,7 +242,7 @@ class InitActivity : BaseActivity() {
      */
     private fun openNetworkSettings() {
         val intent = Intent(android.provider.Settings.ACTION_WIFI_SETTINGS)
-        startActivity(intent)
+        startActivity(intent) {}
     }
 
     private fun addBackKeyListener() {

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

@@ -6,6 +6,7 @@ import android.view.LayoutInflater
 import android.view.ViewGroup
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
+import androidx.activity.OnBackPressedCallback
 import com.shuwei.dish.match.base.BaseActivity
 import com.shuwei.dish.match.base.GlobalData
 import com.shuwei.dish.match.databinding.ActivitySlaveBinding
@@ -44,9 +45,21 @@ class SlaveActivity : BaseActivity() {
         binding.rvScaleList.itemAnimator = null  // 关闭默认动画，避免数据频繁更新时出现闪烁错乱
         binding.rvScaleList.adapter = adapter
 
-        updateMasterStatus(false)
+        updateMasterStatus(ScaleServiceManager.isMasterConnected)
         listenLocalScales()
         listenMasterConnection()
+        addBackKeyListener()
+    }
+
+    /**
+     * 禁用返回键，防止退回 InitActivity 后重复打开本页
+     */
+    private fun addBackKeyListener() {
+        onBackPressedDispatcher.addCallback(this, object : OnBackPressedCallback(true) {
+            override fun handleOnBackPressed() {
+                // 禁用返回键，不执行任何操作
+            }
+        })
     }
 
     /**