From 9ed1e317001a233d07179516b837ef41b0c2795a Mon Sep 17 00:00:00 2001
From: fengge <844143714@qq.com>
Date: Wed, 3 Jun 2026 14:48:58 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BC=98=E5=8C=96(=E6=9E=B6=E6=9E=84=E4=B8=8E?=
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1. 将 ChatViewModel 中 AI 的流式刷新频率 (STREAM_FLUSH_INTERVAL_MS) 从 50ms 调整为 150ms，以降低低端机中高频触发文本重绘(Text Layout)的沉重 CPU 负担，肉眼仍旧保持平滑。
2. 将 SharedPreferences 持久化全量对话记录（saveCacheToLocal）的操作，利用协程移动至 Dispatchers.IO 线程中，防止读写巨大 JSON 字符串时彻底堵死主线程引发应用 ANR 或冻结。
---
 .../stand/standapp/ui/chat/ChatViewModel.kt   | 57 ++++++++++---------
 1 file changed, 30 insertions(+), 27 deletions(-)

diff --git a/app/src/main/java/com/stand/standapp/ui/chat/ChatViewModel.kt b/app/src/main/java/com/stand/standapp/ui/chat/ChatViewModel.kt
index 5a0c6e7..043e423 100644
--- a/app/src/main/java/com/stand/standapp/ui/chat/ChatViewModel.kt
+++ b/app/src/main/java/com/stand/standapp/ui/chat/ChatViewModel.kt
@@ -21,7 +21,7 @@ import org.json.JSONArray
 import org.json.JSONObject
 import java.util.UUID
 
-private const val STREAM_FLUSH_INTERVAL_MS = 50L
+private const val STREAM_FLUSH_INTERVAL_MS = 150L
 
 class ChatViewModel(application: Application) : AndroidViewModel(application) {
     private val repository = AiChatRepository()
@@ -139,34 +139,37 @@ class ChatViewModel(application: Application) : AndroidViewModel(application) {
     }
 
     private fun saveCacheToLocal() {
-        try {
-            // 保存会话列表
-            val sessionsArray = JSONArray()
-            _sessions.value.forEach { session ->
-                val obj = JSONObject()
-                obj.put("id", session.id)
-                obj.put("title", session.title)
-                obj.put("timestamp", session.timestamp)
-                sessionsArray.put(obj)
-            }
+        // 将数据保存放到IO线程中，防止SharedPreferences写大文本阻塞主线程卡顿
+        viewModelScope.launch(kotlinx.coroutines.Dispatchers.IO) {
+            try {
+                // 保存会话列表
+                val sessionsArray = JSONArray()
+                _sessions.value.forEach { session ->
+                    val obj = JSONObject()
+                    obj.put("id", session.id)
+                    obj.put("title", session.title)
+                    obj.put("timestamp", session.timestamp)
+                    sessionsArray.put(obj)
+                }
 
-            // 保存消息列表
-            val messagesArray = JSONArray()
-            _messages.value.forEach { msg ->
-                val obj = JSONObject()
-                obj.put("id", msg.id)
-                obj.put("sessionId", msg.sessionId)
-                obj.put("role", msg.role.name)
-                obj.put("content", msg.content)
-                messagesArray.put(obj)
-            }
+                // 保存消息列表
+                val messagesArray = JSONArray()
+                _messages.value.forEach { msg ->
+                    val obj = JSONObject()
+                    obj.put("id", msg.id)
+                    obj.put("sessionId", msg.sessionId)
+                    obj.put("role", msg.role.name)
+                    obj.put("content", msg.content)
+                    messagesArray.put(obj)
+                }
 
-            prefs.edit()
-                .putString("cache_sessions", sessionsArray.toString())
-                .putString("cache_messages", messagesArray.toString())
-                .apply()
-        } catch (e: Exception) {
-            e.printStackTrace()
+                prefs.edit()
+                    .putString("cache_sessions", sessionsArray.toString())
+                    .putString("cache_messages", messagesArray.toString())
+                    .apply()
+            } catch (e: Exception) {
+                e.printStackTrace()
+            }
         }
     }