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优化(架构与渲染): 提升流式更新性能并修复 SP 持久化阻塞主线程 

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。
This commit is contained in:
fengge 2026-06-03 14:48:58 +08:00
parent e266a4e690
commit 9ed1e31700
1 changed files with 30 additions and 27 deletions
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57
app/src/main/java/com/stand/standapp/ui/chat/ChatViewModel.kt
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@ -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()
}
}
}