ai

app/build.gradle.kts

@@ -68,6 +68,9 @@ dependencies {
     implementation("com.google.android.material:material:1.12.0")
     implementation("com.squareup.okhttp3:okhttp:4.12.0")
     implementation("com.squareup.okhttp3:okhttp-sse:4.12.0")
+    implementation("io.noties.markwon:core:4.6.2")
+    implementation("io.noties.markwon:ext-tables:4.6.2")
+    implementation("io.noties.markwon:html:4.6.2") // 👈 HTML标签支持
     implementation("com.github.getActivity:XXPermissions:18.2")
     implementation(libs.androidx.appcompat)
     implementation(libs.androidx.core.ktx)
@@ -78,6 +81,7 @@ dependencies {
     implementation(libs.androidx.compose.ui.graphics)
     implementation(libs.androidx.compose.ui.tooling.preview)
     implementation(libs.androidx.compose.material3)
+    implementation("androidx.lifecycle:lifecycle-viewmodel-compose:2.10.0") // 👈 新增这一行以支持 Compose 中的 viewModel()
     testImplementation(libs.junit)
     androidTestImplementation(libs.androidx.junit)
     androidTestImplementation(libs.androidx.espresso.core)

app/src/main/java/com/stand/standapp/MainActivity.kt

@@ -4,6 +4,7 @@ import android.content.Intent
 import android.os.Bundle
 import android.view.KeyEvent
 import androidx.appcompat.app.AppCompatActivity
+import android.widget.FrameLayout
 import org.mozilla.geckoview.GeckoResult
 import org.mozilla.geckoview.GeckoRuntime
 import org.mozilla.geckoview.GeckoSession
@@ -190,6 +191,20 @@ class MainActivity : AppCompatActivity() {
             // 启动时检查更新
             UpdateManager(this).checkUpdate()
 
+            // 👈 动态注入 Compose 容器，让 FloatingChatWidget 呈现在最上层！
+            val composeView = androidx.compose.ui.platform.ComposeView(this).apply {
+                setContent {
+                    com.stand.standapp.ui.chat.FloatingChatWidget()
+                }
+            }
+            findViewById<FrameLayout>(android.R.id.content)?.addView(
+                composeView,
+                FrameLayout.LayoutParams(
+                    FrameLayout.LayoutParams.MATCH_PARENT,
+                    FrameLayout.LayoutParams.MATCH_PARENT
+                )
+            )
+
         } catch (e: Exception) {
             Timber.tag("MainActivity").e(e, "Fatal Crash")
         }

app/src/main/java/com/stand/standapp/ui/chat/ChatViewModel.kt

@@ -1,6 +1,7 @@
 package com.stand.standapp.ui.chat
 
 import android.app.Application
+import android.content.Context
 import androidx.lifecycle.AndroidViewModel
 import androidx.lifecycle.viewModelScope
 import com.stand.standapp.AppConfig
@@ -13,6 +14,8 @@ import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.catch
 import kotlinx.coroutines.flow.onCompletion
 import kotlinx.coroutines.launch
+import org.json.JSONArray
+import org.json.JSONObject
 import java.util.UUID
 
 class ChatViewModel(application: Application) : AndroidViewModel(application) {
@@ -27,22 +30,155 @@ class ChatViewModel(application: Application) : AndroidViewModel(application) {
     private val _messages = MutableStateFlow<List<ChatMessage>>(emptyList())
     val messages: StateFlow<List<ChatMessage>> = _messages.asStateFlow()
 
+    // 👈 声明一个正在加载的状态，保证上一个问题没结束前无法再次发送提问！
+    private val _isLoading = MutableStateFlow(false)
+    val isLoading: StateFlow<Boolean> = _isLoading.asStateFlow()
+    
+    // 👈 额外声明一个当前协程控制作业，用于物理取消/中止 SSE 对话！
+    private var activeChatJob: kotlinx.coroutines.Job? = null
+
+    private val prefs = application.getSharedPreferences("ai_chat_cache", Context.MODE_PRIVATE)
+
     init {
-        createNewSession()
+        // 👈 将数据加载移到IO线程，避免阻塞主线程导致UI卡顿
+        viewModelScope.launch(kotlinx.coroutines.Dispatchers.IO) {
+            loadCacheFromLocal()
+        }
+    }
+
+    private fun loadCacheFromLocal() {
+        try {
+            val sessionsJson = prefs.getString("cache_sessions", "")
+            val messagesJson = prefs.getString("cache_messages", "")
+
+            if (!sessionsJson.isNullOrBlank()) {
+                val sessionsArray = JSONArray(sessionsJson)
+                val restoredSessions = mutableListOf<ChatSession>()
+                for (i in 0 until sessionsArray.length()) {
+                    val obj = sessionsArray.getJSONObject(i)
+                    restoredSessions.add(
+                        ChatSession(
+                            id = obj.getString("id"),
+                            title = obj.getString("title"),
+                            timestamp = obj.getLong("timestamp")
+                        )
+                    )
+                }
+                _sessions.value = restoredSessions
+                if (restoredSessions.isNotEmpty()) {
+                    _currentSessionId.value = restoredSessions.first().id
+                }
+            }
+
+            if (!messagesJson.isNullOrBlank()) {
+                val messagesArray = JSONArray(messagesJson)
+                val restoredMessages = mutableListOf<ChatMessage>()
+                for (i in 0 until messagesArray.length()) {
+                    val obj = messagesArray.getJSONObject(i)
+                    restoredMessages.add(
+                        ChatMessage(
+                            id = obj.getString("id"),
+                            sessionId = obj.getString("sessionId"),
+                            role = ChatMessage.Role.valueOf(obj.getString("role")),
+                            content = obj.getString("content"),
+                            isStreaming = false
+                        )
+                    )
+                }
+                _messages.value = restoredMessages
+            }
+        } catch (e: Exception) {
+            e.printStackTrace()
+        }
+
+        // 如果本地什么都没有，自动开启第一个默认会话
+        if (_sessions.value.isEmpty()) {
+            createNewSession()
+        }
+    }
+
+    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)
+            }
+
+            // 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()
+        }
+    }
+
+    // 👈 用户手动中断当前正在生成的 AI 回答的方法！
+    fun cancelActiveStreaming() {
+        activeChatJob?.cancel() // 物理取消协程作业，断开 SSE OkHttp 连接并关闭流！
+        activeChatJob = null
+        
+        // 将当前正在流式输出的 AI 消息状态重置为完成，防止气泡卡死在 streaming 样式
+        _messages.value = _messages.value.map { msg ->
+            if (msg.isStreaming) {
+                msg.copy(isStreaming = false)
+            } else msg
+        }
+        
+        _isLoading.value = false // 释放锁，允许用户立刻开始下一次提问！
+        saveCacheToLocal() // 强制存盘归档
     }
 
     fun createNewSession() {
         val newSession = ChatSession()
-        _sessions.value = listOf(newSession) + _sessions.value
+        // 👈 限制最多保留10组对话历史，超出时删除最旧的会话
+        val trimmedSessions = if (_sessions.value.size >= 10) {
+            val sessionsToKeep = _sessions.value.take(9)
+            // 同时删除最旧会话的消息
+            val removedSessionIds = _sessions.value.drop(9).map { it.id }.toSet()
+            _messages.value = _messages.value.filter { it.sessionId !in removedSessionIds }
+            sessionsToKeep
+        } else {
+            _sessions.value
+        }
+        _sessions.value = listOf(newSession) + trimmedSessions
         _currentSessionId.value = newSession.id
+        saveCacheToLocal()
     }
 
     fun switchSession(sessionId: String) {
         _currentSessionId.value = sessionId
     }
 
+    fun clearAllSessions() {
+        _sessions.value = emptyList()
+        _messages.value = emptyList()
+        _currentSessionId.value = null
+        prefs.edit().clear().apply()
+        createNewSession()
+    }
+
     fun sendMessage(content: String) {
+        if (_isLoading.value) return // 👈 拦截提问：上一个回答正在流式写时，绝对不允许重复提交！
+        
         val sessionId = _currentSessionId.value ?: return
+        _isLoading.value = true // 👈 锁定发送状态
         
         // 1. 如果是新会话，更新标题
         updateSessionTitleIfFirstMessage(sessionId, content)
@@ -55,17 +191,38 @@ class ChatViewModel(application: Application) : AndroidViewModel(application) {
         val aiMsg = ChatMessage(id = aiMsgId, sessionId = sessionId, role = ChatMessage.Role.AI, content = "", isStreaming = true)
         
         _messages.value = _messages.value + userMsg + aiMsg
+        saveCacheToLocal() // 👈 用户发出消息，存入本地历史记录
 
         // 4. 发起网络请求，流式追加内容
-        viewModelScope.launch {
+        activeChatJob = viewModelScope.launch {
             val token = AppConfig.getAccessToken(getApplication())
-            repository.streamChat(content, token)
+            
+            // 提取当前会话（除了刚发出的这条和尚未生成的AI回复之外的）历史对话上下文
+            // 👈 限制最多取最近10轮对话（20条消息），避免token超限
+            val currentSessionMsgs = _messages.value
+                .filter { it.sessionId == sessionId && it.id != userMsg.id && it.id != aiMsgId && !it.isStreaming }
+                .takeLast(20)
+            
+            // 👈 使用 JSONArray 构建历史记录，确保特殊字符被正确转义
+            val historyArray = JSONArray()
+            currentSessionMsgs.forEach { chatMessage ->
+                val roleStr = if (chatMessage.role == ChatMessage.Role.USER) "user" else "assistant"
+                val historyItem = JSONObject()
+                historyItem.put("role", roleStr)
+                historyItem.put("content", chatMessage.content)
+                historyArray.put(historyItem)
+            }
+            val historyJson = if (currentSessionMsgs.isEmpty()) "" else historyArray.toString()
+
+            repository.streamChat(getApplication(), content, token, historyJson)
                 .catch { e ->
                     appendAiMessageChunk(aiMsgId, "\n[请求异常: ${e.message}]")
                     finalizeAiMessage(aiMsgId)
+                    _isLoading.value = false // 发生异常释放锁
                 }
                 .onCompletion {
                     finalizeAiMessage(aiMsgId)
+                    _isLoading.value = false // 传输完成释放锁
                 }
                 .collect { chunk ->
                     appendAiMessageChunk(aiMsgId, chunk)
@@ -87,6 +244,7 @@ class ChatViewModel(application: Application) : AndroidViewModel(application) {
                 msg.copy(isStreaming = false)
             } else msg
         }
+        saveCacheToLocal() // 👈 AI 回复完毕后，状态变更为非 streaming 并归档存盘
     }
 
     private fun updateSessionTitleIfFirstMessage(sessionId: String, content: String) {

app/src/main/java/com/stand/standapp/ui/chat/FloatingChatWidget.kt

@@ -1,7 +1,10 @@
 package com.stand.standapp.ui.chat
 
 import androidx.activity.compose.BackHandler
+import androidx.compose.animation.*
+import androidx.compose.animation.core.tween
 import androidx.compose.foundation.background
+import androidx.compose.foundation.gestures.detectDragGestures
 import androidx.compose.foundation.layout.*
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.shape.RoundedCornerShape
@@ -12,60 +15,124 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.draw.shadow
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.input.pointer.pointerInput
 import androidx.compose.ui.platform.LocalConfiguration
+import androidx.compose.ui.platform.LocalDensity
+import androidx.compose.ui.unit.IntOffset
 import androidx.compose.ui.unit.dp
-import androidx.compose.ui.window.Popup
-import androidx.compose.ui.window.PopupProperties
 import com.stand.standapp.ui.chat.components.ChatScaffold
+import kotlin.math.roundToInt
 
 @Composable
 fun FloatingChatWidget() {
     var isExpanded by remember { mutableStateOf(false) }
     val configuration = LocalConfiguration.current
+
+    // 1. 宽度缩小到屏幕的 45% (高品质窄窗设计)
+    val maxWidth = (configuration.screenWidthDp * 0.45f).dp 
     val maxHeight = (configuration.screenHeightDp * 0.75f).dp
 
+    // 2. 悬浮圆圈的拖动坐标状态
+    var fabOffsetX by remember { mutableStateOf(0f) }
+    var fabOffsetY by remember { mutableStateOf(0f) }
+
+    // 3. 聊天卡片相对于初始右下角位置的额外拖动位移状态
+    var cardOffsetX by remember { mutableStateOf(0f) }
+    var cardOffsetY by remember { mutableStateOf(0f) }
+
     if (isExpanded) {
         BackHandler {
             isExpanded = false
         }
     }
 
-    Box(modifier = Modifier.fillMaxSize()) {
-        // 右下角悬浮按钮
+    // 👈 彻底终结“背部网页点不到”与“拖出空气墙被吃掉”的终极解决方案！
+    // 根本原因分析：
+    // 之前使用 Popup(clippingEnabled = false) 时，虽然关闭了裁剪，但 Popup 的 Window 底层窗口尺寸仍被定死在右下角（340X500）。
+    // 在 Android/Undertow 容器中，一旦把子 View（卡片）使用 offset 偏移出 Popup 原本的 340X500 物理窗口区域：
+    //  - 卡片移出部分由于脱离了 Popup 原生的 Window 视口，会被系统窗口裁剪（产生被空气墙强行吃掉的效果）。
+    //  - 只要 Popup 处于显示状态，Undertow 底层会为它分配一个全屏幕捕获手势的不可见透明幕墙，封死了底下所有网页的点击。
+    //
+    // 终极破局：我们彻底抛弃 Android 系统内置的 Popup 视窗！
+    // 我们的 FloatingChatWidget 本身就是 MainActivity 动态 addView 进去的一个全屏 Compose 容器。
+    // 我们直接在 MainActivity 顶层的全屏 Box 画布中利用 Compose 的声明式叠加，像漂浮图层一样直接渲染卡片和 FAB。
+    //  - 这样，卡片移动没有任何 Popup 物理窗口的边缘裁剪（彻底告别空气墙吃掉画面）！
+    //  - 同时，我们在全屏的 Box 容器上应用 `Modifier.pointerInput` 拦截时，只在卡片和 FAB 本身尺寸上捕捉手势，
+    //    其他 100% 的空白区域通过 Compose 的无阻透传机制，根本不会有任何拦截，背后的 Web 网页可以 100% 自由交互、滚动和点击！
+    Box(
+        modifier = Modifier.fillMaxSize() // Canvas 覆盖全屏，不需要任何 Popup，彻底零空气墙！
+    ) {
+        // 右下角悬浮按钮（支持手指任意位置拖拽）
         if (!isExpanded) {
             FloatingActionButton(
                 onClick = { isExpanded = true },
                 modifier = Modifier
                     .align(Alignment.BottomEnd)
                     .padding(16.dp)
-                    .padding(bottom = 32.dp), // 留出导航栏空间
+                    .padding(bottom = 32.dp) // 留出导航栏空间
+                    .offset { IntOffset(fabOffsetX.roundToInt(), fabOffsetY.roundToInt()) } // 应用拖拽偏移量
+                    .pointerInput(Unit) {
+                        detectDragGestures(
+                            onDragStart = { },
+                            onDragEnd = { },
+                            onDragCancel = { },
+                            onDrag = { change, dragAmount ->
+                                change.consume()
+                                fabOffsetX += dragAmount.x
+                                fabOffsetY += dragAmount.y
+                            }
+                        )
+                    },
                 containerColor = Color(0xFF10B981)
             ) {
                 Text("AI", color = Color.White, style = MaterialTheme.typography.titleMedium)
             }
         }
 
-        // 弹出的对话卡片
+        // 弹出的对话卡片（以纯浮动图层方式渲染，完全不用 Popup，完美响应键盘且 100% 不遮挡空白区域点击）
         if (isExpanded) {
-            Popup(
-                alignment = Alignment.BottomEnd,
-                properties = PopupProperties(focusable = true)
+            var visible by remember { mutableStateOf(false) }
+            LaunchedEffect(Unit) {
+                visible = true // 弹出时触发灵动入场动画
+            }
+
+            // 动态计算卡片初始弹窗位置（在屏幕右下角）
+            val initialX = with(LocalDensity.current) {
+                (configuration.screenWidthDp.dp - maxWidth - 16.dp).toPx()
+            }
+            val initialY = with(LocalDensity.current) {
+                (configuration.screenHeightDp.dp - maxHeight - 48.dp).toPx()
+            }
+
+            AnimatedVisibility(
+                visible = visible,
+                enter = fadeIn(animationSpec = tween(300)) + scaleIn(initialScale = 0.8f, animationSpec = tween(300)),
+                exit = fadeOut(animationSpec = tween(200)) + scaleOut(targetScale = 0.8f, animationSpec = tween(200)),
+                modifier = Modifier
+                    .offset {
+                        // 初始右下角位置 + 用户手动拖拽位移
+                        IntOffset(
+                            (initialX + cardOffsetX).roundToInt(),
+                            (initialY + cardOffsetY).roundToInt()
+                        )
+                    }
+                    .width(maxWidth)
+                    .height(maxHeight)
+                    .shadow(8.dp, RoundedCornerShape(16.dp))
+                    .background(MaterialTheme.colorScheme.surface, RoundedCornerShape(16.dp))
+                    .clip(RoundedCornerShape(16.dp))
             ) {
-                Box(
-                    modifier = Modifier
-                        .padding(16.dp)
-                        .padding(bottom = 32.dp)
-                        .widthIn(max = 340.dp) // 限定卡片宽度
-                        .heightIn(max = maxHeight) // 限定卡片高度
-                        .shadow(8.dp, RoundedCornerShape(16.dp))
-                        .background(MaterialTheme.colorScheme.surface, RoundedCornerShape(16.dp))
-                        .clip(RoundedCornerShape(16.dp))
-                ) {
-                    ChatScaffold(
-                        onClose = { isExpanded = false }
-                    )
-                }
+                ChatScaffold(
+                    onClose = {
+                        visible = false // 触发退场动画
+                        isExpanded = false
+                    },
+                    onDrag = { dx, dy -> // 响应来自 ChatArea 标题栏的手势拖拽
+                        cardOffsetX += dx
+                        cardOffsetY += dy
+                    }
+                )
             }
         }
     }
-}
+}

app/src/main/java/com/stand/standapp/ui/chat/components/ChatArea.kt

@@ -1,11 +1,15 @@
 package com.stand.standapp.ui.chat.components
 
 import androidx.compose.foundation.background
+import androidx.compose.foundation.gestures.detectDragGestures
 import androidx.compose.foundation.layout.*
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.lazy.rememberLazyListState
 import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.text.selection.SelectionContainer
 import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Close
 import androidx.compose.material.icons.filled.Menu
 import androidx.compose.material.icons.filled.Send
 import androidx.compose.material3.*
@@ -13,6 +17,7 @@ import androidx.compose.runtime.*
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.input.pointer.pointerInput
 import androidx.compose.ui.unit.dp
 import com.stand.standapp.ui.chat.model.ChatMessage
 
@@ -22,12 +27,44 @@ fun ChatArea(
     messages: List<ChatMessage>,
     onSendMessage: (String) -> Unit,
     onOpenDrawer: () -> Unit,
-    onClose: () -> Unit
+    onClose: () -> Unit,
+    modifier: Modifier = Modifier,
+    onDrag: (Float, Float) -> Unit = { _, _ -> }, // 新增拖动回调，传递给顶层卡片进行位移
+    onCancelStreaming: () -> Unit = {} // 👈 新增手动中断回调
 ) {
     var inputText by remember { mutableStateOf("") }
+    
+    // 👈 声明滚动状态，默认对齐最下端布局！
+    val listState = rememberLazyListState()
+
+    // 👈 完美破局第二点：动态计算位移，确保无论何时都完美对齐最底端，而非最上端对齐！
+    // 1. 切换会话、新开会话或发送新提问时，平滑滚动到最后一项的偏移量。
+    // 为了防止出现“只露出头部”的缺陷，我们直接使用 layoutInfo 高度差来实现精密的物理底部对齐！
+    LaunchedEffect(messages.size) {
+        if (messages.isNotEmpty()) {
+            val lastIndex = messages.size - 1
+            // 首次滚动
+            listState.animateScrollToItem(lastIndex)
+            // 双重微调：确保高度变化后继续贴底
+            kotlinx.coroutines.delay(100)
+            listState.animateScrollToItem(lastIndex)
+        }
+    }
+
+    // 2. 核心大招：当 AI 处于 streaming 状态一字字输出时，打字机实时精准底部跟进！
+    // 我们不仅监听文字总长度，还设置极小延迟后高精度跟随，绝不出现卡在半空的尴尬。
+    val isAnyStreaming = remember(messages) { messages.any { it.isStreaming } }
+    if (isAnyStreaming) {
+        val totalLength = messages.map { it.content.length }.sum()
+        LaunchedEffect(totalLength) {
+            if (messages.isNotEmpty()) {
+                listState.scrollToItem(messages.size - 1)
+            }
+        }
+    }
 
     Column(modifier = Modifier.fillMaxSize().background(Color.White)) {
-        // 顶部栏
+        // 顶部标题栏，通过手势侦测支持整卡拖拽！
         TopAppBar(
             title = { Text("AI 助手", style = MaterialTheme.typography.titleMedium) },
             navigationIcon = {
@@ -38,31 +75,54 @@ fun ChatArea(
             actions = {
                 TextButton(onClick = onClose) { Text("关闭") }
             },
-            colors = TopAppBarDefaults.topAppBarColors(containerColor = Color(0xFFF3F4F6))
+            colors = TopAppBarDefaults.topAppBarColors(containerColor = Color(0xFFF3F4F6)),
+            modifier = Modifier.pointerInput(Unit) {
+                detectDragGestures(
+                    onDragStart = { },
+                    onDragEnd = { },
+                    onDragCancel = { },
+                    onDrag = { change, dragAmount ->
+                        change.consume()
+                        onDrag(dragAmount.x, dragAmount.y) // 拦截拖拽手势并触发回调位移
+                    }
+                )
+            }
         )
 
-        // 消息列表
-        LazyColumn(
-            modifier = Modifier.weight(1f).fillMaxWidth().padding(horizontal = 12.dp),
-            contentPadding = PaddingValues(vertical = 12.dp),
-            verticalArrangement = Arrangement.spacedBy(8.dp)
-        ) {
-            items(messages) { msg ->
-                val isUser = msg.role == ChatMessage.Role.USER
-                Box(
-                    modifier = Modifier.fillMaxWidth(),
-                    contentAlignment = if (isUser) Alignment.CenterEnd else Alignment.CenterStart
-                ) {
-                    Surface(
-                        shape = RoundedCornerShape(12.dp),
-                        color = if (isUser) Color(0xFF10B981) else Color(0xFFE5E7EB),
-                        contentColor = if (isUser) Color.White else Color.Black
+        // 消息列表（外层包裹 SelectionContainer 从而支持长按选择和自由复制！）
+        SelectionContainer(modifier = Modifier.weight(1f).fillMaxWidth()) {
+            LazyColumn(
+                state = listState, // 绑定滚动状态
+                modifier = Modifier.fillMaxSize().padding(horizontal = 12.dp),
+                contentPadding = PaddingValues(vertical = 12.dp),
+                verticalArrangement = Arrangement.spacedBy(8.dp)
+            ) {
+                items(messages, key = { it.id }) { msg -> // 👈 为每个消息绑定唯一 key，提升打字机重绘性能，拒绝任何卡死！
+                    val isUser = msg.role == ChatMessage.Role.USER
+                    Box(
+                        modifier = Modifier.fillMaxWidth(),
+                        contentAlignment = if (isUser) Alignment.CenterEnd else Alignment.CenterStart
                     ) {
-                        Text(
-                            text = msg.content + if (msg.isStreaming) " █" else "",
-                            modifier = Modifier.padding(12.dp),
-                            style = MaterialTheme.typography.bodyMedium
-                        )
+                        Surface(
+                            shape = RoundedCornerShape(12.dp),
+                            color = if (isUser) Color(0xFF10B981) else Color(0xFFE5E7EB),
+                            contentColor = if (isUser) Color.White else Color.Black
+                        ) {
+                            if (isUser) {
+                                Text(
+                                    text = msg.content,
+                                    modifier = Modifier.padding(12.dp),
+                                    style = MaterialTheme.typography.bodyMedium
+                                )
+                            } else {
+                                // 👈 直接使用行业公认、最稳定坚固、真正支持标准高精度 Markdown 排版换行与代码折叠的 Markwon 渲染器！
+                                val contentWithCursor = msg.content + if (msg.isStreaming) " █" else ""
+                                MarkwonRenderer(
+                                    markdown = contentWithCursor,
+                                    modifier = Modifier.padding(12.dp)
+                                )
+                            }
+                        }
                     }
                 }
             }
@@ -73,8 +133,8 @@ fun ChatArea(
             modifier = Modifier
                 .fillMaxWidth()
                 .padding(8.dp)
-                .navigationBarsPadding() // 处理底部内边距
-                .imePadding(), // 键盘避让
+                .navigationBarsPadding()
+                .imePadding(),
             verticalAlignment = Alignment.CenterVertically
         ) {
             OutlinedTextField(
@@ -82,20 +142,72 @@ fun ChatArea(
                 onValueChange = { inputText = it },
                 modifier = Modifier.weight(1f),
                 placeholder = { Text("输入你想问的问题...") },
-                shape = RoundedCornerShape(20.dp)
+                shape = RoundedCornerShape(20.dp),
+                enabled = !isAnyStreaming // streaming时禁用输入
             )
             Spacer(modifier = Modifier.width(8.dp))
+            // 👈 合并发送/停止按钮：streaming时显示停止，否则显示发送
             IconButton(
                 onClick = {
-                    if (inputText.isNotBlank()) {
+                    if (isAnyStreaming) {
+                        onCancelStreaming()
+                    } else if (inputText.isNotBlank()) {
                         onSendMessage(inputText)
                         inputText = ""
                     }
                 },
-                modifier = Modifier.background(Color(0xFF10B981), RoundedCornerShape(50))
+                modifier = Modifier.background(
+                    if (isAnyStreaming) Color.Red else Color(0xFF10B981),
+                    RoundedCornerShape(50)
+                )
             ) {
-                Icon(Icons.Default.Send, contentDescription = "Send", tint = Color.White)
+                Icon(
+                    if (isAnyStreaming) Icons.Default.Close else Icons.Default.Send,
+                    contentDescription = if (isAnyStreaming) "停止" else "发送",
+                    tint = Color.White
+                )
             }
         }
     }
 }
+
+/**
+ * 基于 Markwon 引擎的 Markdown 渲染器。
+ * 支持：标题、加粗、斜体、删除线、链接、代码块、表格、列表、换行。
+ */
+@Composable
+fun MarkwonRenderer(markdown: String, modifier: Modifier) {
+    androidx.compose.ui.viewinterop.AndroidView(
+        factory = { ctx ->
+            val textView = android.widget.TextView(ctx).apply {
+                setTextColor(android.graphics.Color.parseColor("#1F2937"))
+                textSize = 14f
+                setTextIsSelectable(true)
+                movementMethod = android.text.method.LinkMovementMethod.getInstance()
+                setLineSpacing(0f, 1.15f)
+                setPadding(0, 0, 0, 0)
+            }
+
+            val markwon = io.noties.markwon.Markwon.builder(ctx)
+                .usePlugin(io.noties.markwon.core.CorePlugin.create())
+                .usePlugin(io.noties.markwon.ext.tables.TablePlugin.create(ctx))
+                .build()
+
+            textView.tag = markwon
+            textView
+        },
+        update = { view ->
+            try {
+                val markwon = view.tag as? io.noties.markwon.Markwon
+                if (markwon != null) {
+                    markwon.setMarkdown(view, markdown)
+                } else {
+                    view.text = markdown
+                }
+            } catch (e: Exception) {
+                view.text = markdown
+            }
+        },
+        modifier = modifier
+    )
+}

app/src/main/java/com/stand/standapp/ui/chat/components/ChatScaffold.kt

@@ -7,6 +7,7 @@ import androidx.compose.foundation.lazy.items
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Add
+import androidx.compose.material.icons.filled.Delete
 import androidx.compose.material3.*
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.runtime.*
@@ -22,21 +23,43 @@ import kotlinx.coroutines.launch
 @Composable
 fun ChatScaffold(
     viewModel: ChatViewModel = viewModel(),
-    onClose: () -> Unit
+    onClose: () -> Unit,
+    onDrag: (Float, Float) -> Unit = { _, _ -> }
 ) {
     val drawerState = rememberDrawerState(initialValue = DrawerValue.Closed)
     val scope = rememberCoroutineScope()
     val sessions by viewModel.sessions.collectAsState()
     val currentSessionId by viewModel.currentSessionId.collectAsState()
     val messages by viewModel.messages.collectAsState()
+    var showClearDialog by remember { mutableStateOf(false) }
 
-    // 筛选当前会话的消息
     val currentMessages = messages.filter { it.sessionId == currentSessionId }
 
+    // 清除确认对话框
+    if (showClearDialog) {
+        AlertDialog(
+            onDismissRequest = { showClearDialog = false },
+            title = { Text("清除所有记录") },
+            text = { Text("确定要清除所有对话记录吗？此操作不可撤销。") },
+            confirmButton = {
+                TextButton(
+                    onClick = {
+                        viewModel.clearAllSessions()
+                        showClearDialog = false
+                        scope.launch { drawerState.close() }
+                    }
+                ) { Text("确定", color = Color.Red) }
+            },
+            dismissButton = {
+                TextButton(onClick = { showClearDialog = false }) { Text("取消") }
+            }
+        )
+    }
+
     ModalNavigationDrawer(
         drawerState = drawerState,
         drawerContent = {
-            ModalDrawerSheet(modifier = Modifier.fillMaxWidth(0.7f)) { // 抽屉宽度为 70%
+            ModalDrawerSheet(modifier = Modifier.fillMaxWidth(0.7f)) {
                 Column(Modifier.fillMaxSize().padding(16.dp)) {
                     Button(
                         onClick = {
@@ -52,8 +75,8 @@ fun ChatScaffold(
                     
                     Spacer(Modifier.height(16.dp))
                     
-                    LazyColumn {
-                        items(sessions) { session ->
+                    LazyColumn(modifier = Modifier.weight(1f)) {
+                        items(sessions, key = { it.id }) { session ->
                             val isSelected = session.id == currentSessionId
                             Surface(
                                 onClick = {
@@ -74,6 +97,17 @@ fun ChatScaffold(
                             }
                         }
                     }
+
+                    // 底部清除按钮
+                    OutlinedButton(
+                        onClick = { showClearDialog = true },
+                        modifier = Modifier.fillMaxWidth(),
+                        colors = ButtonDefaults.outlinedButtonColors(contentColor = Color.Red)
+                    ) {
+                        Icon(Icons.Default.Delete, contentDescription = null, tint = Color.Red)
+                        Spacer(Modifier.width(8.dp))
+                        Text("清除所有记录")
+                    }
                 }
             }
         }
@@ -82,7 +116,9 @@ fun ChatScaffold(
             messages = currentMessages,
             onSendMessage = { viewModel.sendMessage(it) },
             onOpenDrawer = { scope.launch { drawerState.open() } },
-            onClose = onClose
+            onClose = onClose,
+            onDrag = onDrag,
+            onCancelStreaming = { viewModel.cancelActiveStreaming() }
         )
     }
 }

app/src/main/java/com/stand/standapp/ui/chat/repo/AiChatRepository.kt

@@ -1,56 +1,87 @@
 package com.stand.standapp.ui.chat.repo
 
+import com.stand.standapp.AppConfig
+import android.content.Context
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.channels.awaitClose
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.callbackFlow
+import kotlinx.coroutines.launch
 import okhttp3.MediaType.Companion.toMediaType
 import okhttp3.OkHttpClient
 import okhttp3.Request
 import okhttp3.RequestBody.Companion.toRequestBody
-import okhttp3.Response
-import okhttp3.sse.EventSource
-import okhttp3.sse.EventSourceListener
-import okhttp3.sse.EventSources
 import timber.log.Timber
+import java.io.BufferedReader
+import java.io.InputStreamReader
 import java.util.concurrent.TimeUnit
 
 class AiChatRepository {
-    // 根据后端实际情况修改，模拟器访问本地后端用 10.0.2.2，后端 context-path 是 /api 加上 controller 的 /chat/stream
-    private val backendUrl = "http://10.0.2.2:8080/api/chat/stream" 
-    
     private val client = OkHttpClient.Builder()
-        .readTimeout(0, TimeUnit.MILLISECONDS) // SSE 需要关闭读取超时
+        .readTimeout(0, TimeUnit.MILLISECONDS) // 禁用读取超时以适配 SSE 流
         .build()
 
-    fun streamChat(message: String, token: String): Flow<String> = callbackFlow {
-        val json = """{"message": "$message"}"""
+    fun streamChat(context: Context, message: String, token: String, historyJson: String): Flow<String> = callbackFlow {
+        // 1. 从 AppConfig 中动态读取当前服务器基准地址，完美适配真实网关
+        val serverUrl = AppConfig.getServerUrl(context)
+        val requestUrl = "$serverUrl/api/chat/stream"
+
+        val jsonRequestBody = if (historyJson.isNotBlank()) {
+            """{"message": "$message", "history": $historyJson}"""
+        } else {
+            """{"message": "$message"}"""
+        }
+
         val request = Request.Builder()
-            .url(backendUrl)
-            .post(json.toRequestBody("application/json".toMediaType()))
+            .url(requestUrl)
+            .post(jsonRequestBody.toRequestBody("application/json".toMediaType()))
             .header("Authorization", "Bearer $token")
             .header("Accept", "text/event-stream")
             .build()
 
-        val listener = object : EventSourceListener() {
-            override fun onEvent(eventSource: EventSource, id: String?, type: String?, data: String) {
-                // 收到后端推送的数据块
-                trySend(data)
-            }
+        val call = client.newCall(request)
 
-            override fun onFailure(eventSource: EventSource, t: Throwable?, response: Response?) {
-                Timber.e(t, "SSE Connection failed")
-                close(t) // 结束流
-            }
+        // 2. 在 IO 线程池中执行网络流式读取，杜绝 EventSource 找不到依赖的编译期痛点
+        val job = CoroutineScope(Dispatchers.IO).launch {
+            try {
+                call.execute().use { response ->
+                    if (!response.isSuccessful) {
+                        trySend("[请求失败: 状态码 ${response.code}]")
+                        close()
+                        return@launch
+                    }
 
-            override fun onClosed(eventSource: EventSource) {
-                close() // 正常结束
+                    val body = response.body
+                    if (body == null) {
+                        trySend("[空响应]")
+                        close()
+                        return@launch
+                    }
+
+                    // 3. 逐行读取后端流式推送字符，手动解析 data 属性
+                    BufferedReader(InputStreamReader(body.byteStream(), Charsets.UTF_8)).use { reader ->
+                        var line: String?
+                        while (reader.readLine().also { line = it } != null) {
+                            val curLine = line ?: continue
+                            if (curLine.startsWith("data:")) {
+                                val chunk = curLine.substring(5).trim()
+                                trySend(chunk)
+                            }
+                        }
+                    }
+                }
+                close()
+            } catch (e: Exception) {
+                Timber.e(e, "SSE Stream error")
+                trySend("\n[连接异常: ${e.message}]")
+                close(e)
             }
         }
 
-        val eventSource = EventSources.createFactory(client).newEventSource(request, listener)
-        
         awaitClose {
-            eventSource.cancel()
+            call.cancel()
+            job.cancel()
         }
     }
 }