feat: Implement "Save to Gallery" and enhance image/comment interactions

This commit introduces the ability for users to save images to their device's gallery and includes several enhancements to the image detail screen and comment section.

**Key Changes:**

*   **feat(Image Saving):**
    *   **ImageSaveUtils:** Added a new `ImageSaveUtils.kt` utility to handle saving images to the device gallery. It supports both modern (Android Q+) and legacy storage APIs.
    *   **Save Button:** Implemented a "Save" icon button in the `ImageDetailScreen` top bar, allowing users to download the currently viewed image.
    *   **Feedback:** The app now displays a `Snackbar` message (e.g., "Image saved to gallery") upon successful or failed save operations.

*   **feat(Image Detail Screen):**
    *   **Improved Zoom/Pan:** Reworked the zoom and pan logic in `ZoomableImage` for a smoother experience. The `HorizontalPager` is now disabled when an image is zoomed in to prevent accidental swiping.
    *   **Double-Tap to Zoom:** Added double-tap-to-zoom functionality on the `ImageDetailScreen`.

*   **refactor(Comments):**
    *   **Improved Reply UI:** The comment input bar now shows a preview of the comment being replied to (e.g., "Replying to User: This is the comment...").
    *   **Deprecated DTO Fields:** Marked `commentDateTime` and `imageGuid` in `CreateCommentDto` as deprecated, as they are now handled by the backend.

*   **refactor(Permissions):**
    *   Added `WRITE_EXTERNAL_STORAGE`, `READ_EXTERNAL_STORAGE`, and `READ_MEDIA_IMAGES` permissions to `AndroidManifest.xml` to support the new image saving feature across different Android versions.

*   **fix(Login):**
    *   Ensured that the user's profile information is fetched immediately after the login token is successfully saved, fixing a potential race condition.

app/src/main/AndroidManifest.xml

@@ -3,6 +3,11 @@
     xmlns:tools="http://schemas.android.com/tools">
 
     <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
+        android:maxSdkVersion="28" />
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" 
+        android:maxSdkVersion="32" />
+    <uses-permission android:name="android.permission.READ_MEDIA_IMAGES" />
 
     <application
         android:name=".TangyuanApplication"

app/src/main/java/com/qingshuige/tangyuan/model/CommentCard.kt

@@ -91,7 +91,10 @@ data class PostDetailState(
     // 评论输入状态
     val isCreatingComment: Boolean = false,
     val commentError: String? = null,
-    val replyToComment: CommentCard? = null
+    val replyToComment: CommentCard? = null,
+    
+    // 图片保存状态
+    val saveMessage: String? = null
 )
 
 /**

app/src/main/java/com/qingshuige/tangyuan/model/CreateCommentDto.kt

@@ -3,8 +3,15 @@ package com.qingshuige.tangyuan.model
 import java.util.Date
 
 data class CreateCommentDto(
-    val commentDateTime: Date? = null,
+    @Deprecated(
+        message = "后台自动生成，无需传递",
+        replaceWith = ReplaceWith("null")
+    ) val commentDateTime: Date? = null,
     val content: String? = null,
+    @Deprecated(
+        message = "字段已废弃，无需传递",
+        replaceWith = ReplaceWith("null")
+    )
     val imageGuid: String? = null,
     val parentCommentId: Long? = 0,
     val postId: Long = 0,

app/src/main/java/com/qingshuige/tangyuan/ui/components/CommentComponents.kt

@@ -17,11 +17,13 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.input.ImeAction
 import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import coil.compose.AsyncImage
@@ -32,6 +34,7 @@ import com.qingshuige.tangyuan.ui.theme.LiteraryFontFamily
 import com.qingshuige.tangyuan.ui.theme.TangyuanGeneralFontFamily
 import com.qingshuige.tangyuan.ui.theme.TangyuanShapes
 import com.qingshuige.tangyuan.utils.withPanguSpacing
+import java.util.Date
 
 /**
  * 评论项组件
@@ -299,7 +302,7 @@ private fun CommentActions(
  */
 @Composable
 private fun CommentActionButton(
-    icon: androidx.compose.ui.graphics.vector.ImageVector,
+    icon: ImageVector,
     count: Int = 0,
     text: String = "",
     isActive: Boolean,
@@ -535,7 +538,7 @@ fun CommentInputBar(
                 modifier = Modifier
                     .fillMaxWidth()
                     .padding(16.dp),
-                verticalAlignment = Alignment.Bottom,
+                verticalAlignment = Alignment.CenterVertically,
                 horizontalArrangement = Arrangement.spacedBy(8.dp)
             ) {
                 // 输入框
@@ -545,7 +548,8 @@ fun CommentInputBar(
                     modifier = Modifier.weight(1f),
                     placeholder = {
                         Text(
-                            text = if (replyToComment != null) "回复 ${replyToComment.authorName}" else "说点什么...",
+                            text = if (replyToComment != null) "回复 ${replyToComment.authorName}" + ": " + {replyToComment.content.take(20) + if (replyToComment.content.length > 20) "..." else ""}()
+                                    else "说点什么...",
                             fontFamily = LiteraryFontFamily,
                             color = MaterialTheme.colorScheme.onSurfaceVariant
                         )
@@ -602,6 +606,25 @@ fun CommentInputBar(
     }
 }
 
+@Preview
+@Composable
+private fun CommentInputBarPreview() {
+    CommentInputBar(
+        isCreating = false,
+        replyToComment = CommentCard(
+            commentId = 1,
+            postId = 1,
+            content = "这是一个回复评论的示例。",
+            commentDateTime = Date(),
+            authorId = 1,
+            authorName = "示例用户",
+            authorAvatar = "avatar1"
+        ),
+        onSendComment = {},
+        onCancelReply = {}
+    )
+}
+
 /**
  * 回复指示器
  */
@@ -632,7 +655,7 @@ private fun ReplyIndicator(
             Text(
                 text = "回复 ${comment.authorName}",
                 style = MaterialTheme.typography.bodySmall,
-                fontFamily = LiteraryFontFamily,
+                fontFamily = TangyuanGeneralFontFamily,
                 color = MaterialTheme.colorScheme.tertiary,
                 modifier = Modifier.weight(1f)
             )

app/src/main/java/com/qingshuige/tangyuan/ui/screens/ImageDetailScreen.kt

@@ -23,12 +23,16 @@ import androidx.compose.ui.geometry.Offset
 import androidx.compose.ui.graphics.Brush
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.graphicsLayer
+import androidx.compose.ui.input.pointer.consumePositionChange
 import androidx.compose.ui.input.pointer.pointerInput
+import androidx.compose.ui.input.pointer.positionChange
 import androidx.compose.ui.layout.ContentScale
+import androidx.compose.ui.layout.onSizeChanged
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.IntSize
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import androidx.hilt.navigation.compose.hiltViewModel
@@ -38,11 +42,10 @@ import com.qingshuige.tangyuan.TangyuanApplication
 import com.qingshuige.tangyuan.model.PostCard
 import com.qingshuige.tangyuan.ui.theme.LiteraryFontFamily
 import com.qingshuige.tangyuan.ui.theme.TangyuanGeneralFontFamily
-import com.qingshuige.tangyuan.ui.theme.TangyuanShapes
 import com.qingshuige.tangyuan.utils.withPanguSpacing
 import com.qingshuige.tangyuan.viewmodel.PostDetailViewModel
-import kotlin.math.max
+import kotlinx.coroutines.CoroutineScope
-import kotlin.math.min
+import kotlinx.coroutines.launch
 
 /**
  * 图片详情页面 - 以图片为主的展示界面
@@ -60,8 +63,15 @@ fun ImageDetailScreen(
     animatedContentScope: AnimatedContentScope? = null
 ) {
     val state by viewModel.state.collectAsState()
-    
+    val snackbarHostState = remember { SnackbarHostState() }
-    // 加载帖子详情
+
+    LaunchedEffect(state.saveMessage) {
+        state.saveMessage?.let { message ->
+            snackbarHostState.showSnackbar(message = message, duration = SnackbarDuration.Short)
+            viewModel.clearSaveMessage()
+        }
+    }
+
     LaunchedEffect(postId) {
         viewModel.loadPostDetail(postId)
     }
@@ -88,8 +98,14 @@ fun ImageDetailScreen(
                 ImageDetailTopBar(
                     onBackClick = onBackClick,
                     currentIndex = pagerState.currentPage + 1,
-                    totalCount = imageUUIDs.size
+                    totalCount = imageUUIDs.size,
+                    onSaveClick = {
+                        val currentImageUrl =
+                            "${TangyuanApplication.instance.bizDomain}images/${imageUUIDs[pagerState.currentPage]}.jpg"
+                        viewModel.saveCurrentImage(currentImageUrl)
+                    }
                 )
+                Spacer(modifier = Modifier.height(16.dp))
                 
                 // 图片轮播区域
                 Box(
@@ -108,6 +124,8 @@ fun ImageDetailScreen(
                         )
                     }
                 }
+
+                Spacer(modifier = Modifier.height(16.dp))
                 
                 // 底部内容区域（模糊遮罩）
                 BottomContentOverlay(
@@ -118,14 +136,20 @@ fun ImageDetailScreen(
                     animatedContentScope = animatedContentScope
                 )
             }
+            SnackbarHost(
+                hostState = snackbarHostState,
+                modifier = Modifier
+                    .align(Alignment.BottomCenter)
+                    .navigationBarsPadding()
+            )
         }
     }
-    
+
     // 加载状态
     if (state.isLoading && state.postCard == null) {
         LoadingContent()
     }
-    
+
     // 错误状态
     state.error?.let { error ->
         ErrorContent(
@@ -160,7 +184,7 @@ private fun BackgroundBlurredImage(
             alpha = 0.3f
         )
     }
-    
+
     // 渐变遮罩
     Box(
         modifier = Modifier
@@ -185,7 +209,8 @@ private fun BackgroundBlurredImage(
 private fun ImageDetailTopBar(
     onBackClick: () -> Unit,
     currentIndex: Int,
-    totalCount: Int
+    totalCount: Int,
+    onSaveClick: () -> Unit
 ) {
     TopAppBar(
         title = {
@@ -206,15 +231,22 @@ private fun ImageDetailTopBar(
                 )
             }
         },
+        actions = {
+            // 保存图片按钮
+            IconButton(onClick = onSaveClick) {
+                Icon(
+                    imageVector = Icons.Default.Download,
+                    contentDescription = "保存图片",
+                    tint = Color.White
+                )
+            }
+        },
         colors = TopAppBarDefaults.topAppBarColors(
             containerColor = Color.Transparent
         )
     )
 }
 
-/**
- * 图片轮播组件
- */
 @OptIn(ExperimentalSharedTransitionApi::class)
 @Composable
 private fun ImagePager(
@@ -224,9 +256,13 @@ private fun ImagePager(
     sharedTransitionScope: SharedTransitionScope? = null,
     animatedContentScope: AnimatedContentScope? = null
 ) {
+    // 用于控制Pager是否允许左右滑动
+    var canScroll by remember { mutableStateOf(true) }
+
     HorizontalPager(
         state = pagerState,
-        modifier = Modifier.fillMaxSize()
+        modifier = Modifier.fillMaxSize(),
+        userScrollEnabled = canScroll // ✅ 当缩放时禁用Pager滑动
     ) { page ->
         ZoomableImage(
             imageUrl = "${TangyuanApplication.instance.bizDomain}images/${imageUUIDs[page]}.jpg",
@@ -234,14 +270,14 @@ private fun ImagePager(
             imageIndex = page,
             contentDescription = "图片 ${page + 1}",
             sharedTransitionScope = sharedTransitionScope,
-            animatedContentScope = animatedContentScope
+            animatedContentScope = animatedContentScope,
+            onScaleChanged = { newScale ->
+                canScroll = newScale <= 1.01f // 缩放>1时禁用pager滑动
+            }
         )
     }
 }
 
-/**
- * 可缩放的图片组件
- */
 @OptIn(ExperimentalSharedTransitionApi::class)
 @Composable
 private fun ZoomableImage(
@@ -250,23 +286,45 @@ private fun ZoomableImage(
     imageIndex: Int,
     contentDescription: String,
     sharedTransitionScope: SharedTransitionScope? = null,
-    animatedContentScope: AnimatedContentScope? = null
+    animatedContentScope: AnimatedContentScope? = null,
+    onScaleChanged: (Float) -> Unit = {}
 ) {
     var scale by remember { mutableFloatStateOf(1f) }
     var offset by remember { mutableStateOf(Offset.Zero) }
-    
+
-    val transformableState = rememberTransformableState { zoomChange, offsetChange, _ ->
-        scale = (scale * zoomChange).coerceIn(1f, 5f)
-        val maxX = (scale - 1) * 300
-        val maxY = (scale - 1) * 300
-        offset = Offset(
-            x = (offset.x + offsetChange.x).coerceIn(-maxX, maxX),
-            y = (offset.y + offsetChange.y).coerceIn(-maxY, maxY)
-        )
-    }
-    
     Box(
-        modifier = Modifier.fillMaxSize(),
+        modifier = Modifier
+            .fillMaxSize()
+            // ✅ 缩放 & 平移逻辑
+            .pointerInput(Unit) {
+                detectTransformGestures { _, pan, zoom, _ ->
+                    val newScale = (scale * zoom).coerceIn(1f, 5f)
+                    val maxX = (newScale - 1f) * 400f
+                    val maxY = (newScale - 1f) * 400f
+                    val newOffset = Offset(
+                        x = (offset.x + pan.x).coerceIn(-maxX, maxX),
+                        y = (offset.y + pan.y).coerceIn(-maxY, maxY)
+                    )
+
+                    scale = newScale
+                    offset = newOffset
+                    onScaleChanged(newScale)
+                }
+            }
+            // ✅ 双击缩放
+            .pointerInput(Unit) {
+                detectTapGestures(
+                    onDoubleTap = {
+                        if (scale > 1f) {
+                            scale = 1f
+                            offset = Offset.Zero
+                        } else {
+                            scale = 2f
+                        }
+                        onScaleChanged(scale)
+                    }
+                )
+            },
         contentAlignment = Alignment.Center
     ) {
         AsyncImage(
@@ -275,43 +333,34 @@ private fun ZoomableImage(
                 .crossfade(true)
                 .build(),
             contentDescription = contentDescription,
+            contentScale = ContentScale.Fit,
             modifier = Modifier
                 .fillMaxSize()
-                .let { mod ->
+                .graphicsLayer {
+                    scaleX = scale
+                    scaleY = scale
+                    translationX = offset.x
+                    translationY = offset.y
+                }
+                .then(
                     if (sharedTransitionScope != null && animatedContentScope != null) {
                         with(sharedTransitionScope) {
-                            mod.sharedElement(
+                            Modifier.sharedElement(
                                 rememberSharedContentState(key = "post_image_${postId}_${imageIndex}"),
                                 animatedVisibilityScope = animatedContentScope,
                                 boundsTransform = { _, _ ->
                                     tween(durationMillis = 400, easing = FastOutSlowInEasing)
-                                },
+                                }
-                                placeHolderSize = SharedTransitionScope.PlaceHolderSize.animatedSize,
-                                renderInOverlayDuringTransition = false
                             )
                         }
-                    } else mod
+                    } else Modifier
-                }
-                .graphicsLayer(
-                    scaleX = scale,
-                    scaleY = scale,
-                    translationX = offset.x,
-                    translationY = offset.y
                 )
-                .transformable(state = transformableState)
-                .pointerInput(Unit) {
-                    detectTapGestures(
-                        onDoubleTap = {
-                            scale = if (scale > 1f) 1f else 2f
-                            offset = Offset.Zero
-                        }
-                    )
-                },
-            contentScale = ContentScale.Fit
         )
     }
 }
 
+
+
 /**
  * 底部内容遮罩
  */
@@ -326,7 +375,7 @@ private fun BottomContentOverlay(
 ) {
     var offsetY by remember { mutableFloatStateOf(0f) }
     val swipeThreshold = -100f // 上滑超过100px触发切换
-    
+
     Box(
         modifier = Modifier
             .fillMaxWidth()
@@ -358,17 +407,13 @@ private fun BottomContentOverlay(
                 .fillMaxWidth()
                 .padding(20.dp)
         ) {
-            // 作者信息
             PostAuthorInfo(
                 postCard = postCard,
                 onAuthorClick = onAuthorClick,
                 sharedTransitionScope = sharedTransitionScope,
                 animatedContentScope = animatedContentScope
             )
-            
             Spacer(modifier = Modifier.height(16.dp))
-            
-            // 文章内容
             Text(
                 text = postCard.textContent.withPanguSpacing(),
                 style = MaterialTheme.typography.bodyMedium.copy(
@@ -379,10 +424,7 @@ private fun BottomContentOverlay(
                 maxLines = 4,
                 overflow = TextOverflow.Ellipsis
             )
-            
             Spacer(modifier = Modifier.height(16.dp))
-            
-            // 分类和时间
             Row(
                 modifier = Modifier.fillMaxWidth(),
                 horizontalArrangement = Arrangement.SpaceBetween,
@@ -401,7 +443,6 @@ private fun BottomContentOverlay(
                         fontWeight = FontWeight.Medium
                     )
                 }
-                
                 Text(
                     text = postCard.getTimeDisplayText(),
                     style = MaterialTheme.typography.bodySmall,
@@ -409,10 +450,7 @@ private fun BottomContentOverlay(
                     color = Color.White.copy(alpha = 0.8f)
                 )
             }
-            
             Spacer(modifier = Modifier.height(20.dp))
-            
-            // 上滑提示 - 放在最下面居中
             Row(
                 modifier = Modifier.fillMaxWidth(),
                 horizontalArrangement = Arrangement.Center
@@ -467,9 +505,7 @@ private fun PostAuthorInfo(
                 .clip(CircleShape),
             contentScale = ContentScale.Crop
         )
-        
         Spacer(modifier = Modifier.width(12.dp))
-        
         Column {
             Text(
                 text = postCard.authorName.withPanguSpacing(),
@@ -489,7 +525,6 @@ private fun PostAuthorInfo(
                     }
                 } else Modifier
             )
-            
             if (postCard.authorBio.isNotBlank()) {
                 Text(
                     text = postCard.authorBio.withPanguSpacing(),
@@ -557,7 +592,6 @@ private fun ErrorContent(
                 tint = Color.White,
                 modifier = Modifier.size(48.dp)
             )
-            
             Text(
                 text = "加载失败",
                 style = MaterialTheme.typography.headlineSmall,
@@ -565,7 +599,6 @@ private fun ErrorContent(
                 color = Color.White,
                 fontWeight = FontWeight.SemiBold
             )
-            
             Text(
                 text = message,
                 style = MaterialTheme.typography.bodyMedium,
@@ -573,7 +606,6 @@ private fun ErrorContent(
                 color = Color.White.copy(alpha = 0.8f),
                 textAlign = TextAlign.Center
             )
-            
             Button(
                 onClick = onRetry,
                 colors = ButtonDefaults.buttonColors(

app/src/main/java/com/qingshuige/tangyuan/ui/screens/PostDetailScreen.kt

@@ -530,7 +530,7 @@ private fun CommentSectionHeader(commentCount: Int, isLoading: Boolean = false)
             Text(
                 text = "评论 ($commentCount)",
                 style = MaterialTheme.typography.titleMedium,
-                fontFamily = LiteraryFontFamily,
+                fontFamily = TangyuanGeneralFontFamily,
                 color = MaterialTheme.colorScheme.onSurface,
                 fontWeight = FontWeight.SemiBold
             )

app/src/main/java/com/qingshuige/tangyuan/utils/ImageSaveUtils.kt

@@ -0,0 +1,97 @@
+package com.qingshuige.tangyuan.utils
+
+import android.content.ContentValues
+import android.content.Context
+import android.graphics.Bitmap
+import android.graphics.drawable.BitmapDrawable
+import android.os.Build
+import android.os.Environment
+import android.provider.MediaStore
+import coil.ImageLoader
+import coil.request.ImageRequest
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import java.io.File
+import java.io.FileOutputStream
+import java.io.IOException
+
+object ImageSaveUtils {
+    
+    suspend fun saveImageToGallery(
+        context: Context,
+        imageUrl: String,
+        fileName: String? = null
+    ): Result<String> = withContext(Dispatchers.IO) {
+        try {
+            val imageLoader = ImageLoader(context)
+            val request = ImageRequest.Builder(context)
+                .data(imageUrl)
+                .build()
+                
+            val drawable = imageLoader.execute(request).drawable
+            val bitmap = (drawable as? BitmapDrawable)?.bitmap 
+                ?: return@withContext Result.failure(Exception("无法获取图片"))
+            
+            val displayName = fileName ?: "Tangyuan_${System.currentTimeMillis()}.jpg"
+            
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+                saveImageToMediaStore(context, bitmap, displayName)
+            } else {
+                saveImageToExternalStorage(bitmap, displayName)
+            }
+        } catch (e: Exception) {
+            Result.failure(e)
+        }
+    }
+    
+    private fun saveImageToMediaStore(
+        context: Context,
+        bitmap: Bitmap,
+        displayName: String
+    ): Result<String> {
+        val contentValues = ContentValues().apply {
+            put(MediaStore.MediaColumns.DISPLAY_NAME, displayName)
+            put(MediaStore.MediaColumns.MIME_TYPE, "image/jpeg")
+            put(MediaStore.MediaColumns.RELATIVE_PATH, Environment.DIRECTORY_PICTURES + "/Tangyuan")
+        }
+        
+        val uri = context.contentResolver.insert(
+            MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
+            contentValues
+        ) ?: return Result.failure(Exception("无法创建文件"))
+        
+        return try {
+            context.contentResolver.openOutputStream(uri)?.use { outputStream ->
+                bitmap.compress(Bitmap.CompressFormat.JPEG, 90, outputStream)
+            }
+            Result.success("图片已保存到相册")
+        } catch (e: IOException) {
+            Result.failure(e)
+        }
+    }
+    
+    private fun saveImageToExternalStorage(
+        bitmap: Bitmap,
+        displayName: String
+    ): Result<String> {
+        val picturesDir = File(
+            Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
+            "Tangyuan"
+        )
+        
+        if (!picturesDir.exists()) {
+            picturesDir.mkdirs()
+        }
+        
+        val imageFile = File(picturesDir, displayName)
+        
+        return try {
+            FileOutputStream(imageFile).use { outputStream ->
+                bitmap.compress(Bitmap.CompressFormat.JPEG, 90, outputStream)
+            }
+            Result.success("图片已保存到 ${imageFile.absolutePath}")
+        } catch (e: IOException) {
+            Result.failure(e)
+        }
+    }
+}

app/src/main/java/com/qingshuige/tangyuan/viewmodel/PostDetailViewModel.kt

@@ -1,5 +1,6 @@
 package com.qingshuige.tangyuan.viewmodel
 
+import android.content.Context
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import com.qingshuige.tangyuan.model.CommentCard
@@ -7,7 +8,9 @@ import com.qingshuige.tangyuan.model.CreateCommentDto
 import com.qingshuige.tangyuan.model.PostCard
 import com.qingshuige.tangyuan.model.PostDetailState
 import com.qingshuige.tangyuan.repository.PostDetailRepository
+import com.qingshuige.tangyuan.utils.ImageSaveUtils
 import dagger.hilt.android.lifecycle.HiltViewModel
+import dagger.hilt.android.qualifiers.ApplicationContext
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
@@ -17,7 +20,8 @@ import javax.inject.Inject
 
 @HiltViewModel
 class PostDetailViewModel @Inject constructor(
-    private val postDetailRepository: PostDetailRepository
+    private val postDetailRepository: PostDetailRepository,
+    @ApplicationContext private val context: Context
 ) : ViewModel() {
     
     private val _state = MutableStateFlow(PostDetailState())
@@ -130,7 +134,8 @@ class PostDetailViewModel @Inject constructor(
             val createCommentDto = CreateCommentDto(
                 postId = currentPostId.toLong(),
                 content = content,
-                parentCommentId = if (parentCommentId == 0) null else parentCommentId.toLong()
+                parentCommentId = if (parentCommentId == 0) null else parentCommentId.toLong(),
+                userId = currentUserId.toLong()
             )
             
             postDetailRepository.createComment(createCommentDto)
@@ -284,4 +289,36 @@ class PostDetailViewModel @Inject constructor(
         currentPostId = 0
         currentUserId = 0
     }
+    
+    /**
+     * 保存当前图片到本地
+     */
+    fun saveCurrentImage(imageUrl: String) {
+        viewModelScope.launch {
+            try {
+                val result = ImageSaveUtils.saveImageToGallery(context, imageUrl)
+                result.onSuccess { message ->
+                    _state.value = _state.value.copy(
+                        error = null,
+                        saveMessage = message
+                    )
+                }.onFailure { exception ->
+                    _state.value = _state.value.copy(
+                        error = exception.message ?: "保存图片失败"
+                    )
+                }
+            } catch (e: Exception) {
+                _state.value = _state.value.copy(
+                    error = e.message ?: "保存图片失败"
+                )
+            }
+        }
+    }
+    
+    /**
+     * 清除保存消息
+     */
+    fun clearSaveMessage() {
+        _state.value = _state.value.copy(saveMessage = null)
+    }
 }

app/src/main/java/com/qingshuige/tangyuan/viewmodel/UserViewModel.kt

@@ -150,6 +150,7 @@ class UserViewModel @Inject constructor(
                     val token = result["token"]
                     if (token != null) {
                         tokenManager.token = token
+                        println("DEBUG: 手动登录成功，已保存token: ${token.take(20)}...")
                     }
                     // 登录成功，保存账号密码用于自动登录
                     tokenManager.setPhoneNumberAndPassword(
@@ -162,8 +163,13 @@ class UserViewModel @Inject constructor(
                         isLoggedIn = true,
                     )
                     
-                    // 登录成功后获取用户信息
+                    // 确保token保存后再获取用户信息
-                    getCurrentUserFromToken()
+                    if (token != null) {
+                        println("DEBUG: 手动登录后开始获取用户信息")
+                        getCurrentUserFromToken()
+                    } else {
+                        println("DEBUG: 手动登录失败，未获取到token")
+                    }
                 }
         }
     }