简化拼图布局：只保留2x2和3x3两种网格布局

README.md

@@ -8,7 +8,7 @@ CheckShot 是一个面向 Android 的图片处理与检查工具，包含水印
   - 地点水印：优先通过 Geocoder 联网解析地址，失败时回落显示经纬度。可在设置中配置校准方式。
   - 样式：提供三种预设样式（默认/简约/醒目），并可在设置中预览和应用。
 - 多图拼图（合成）模块
-  - 布局规则：核心布局为 2x2 网格，且支持扩展布局如 1+3、3+1、1+2、2+1、单图等，图片自动缩放裁剪以适配网格。
+  - 布局规则：支持 2x2 和 3x3 两种网格布局，图片自动缩放裁剪以适配网格。
   - 核心能力：图片拼接、模板化布局编辑（替换/删除图片）、合成质量控制（分辨率/清晰度）。
   - 交互：支持替换网格中的图片、删除图片、添加新图片、设置合成质量和文本水印文本。
 - 设置与通用配置

app/src/main/java/com/inspection/camera/data/models/WatermarkModels.kt

@@ -60,8 +60,7 @@ enum class ImageQuality(val quality: Int, val displayName: String) {
 /**
  * 合成布局类型
  */
-enum class MergeLayoutType(val rows: Int, val cols: Int, val displayName: String) {
+enum class MergeLayoutType(val rows: Int, val cols: Int, val displayName: String, val maxImages: Int) {
-    Grid2x2(2, 2, "2x2网格"),
+    Grid2x2(2, 2, "2x2网格", 4),
-    Grid1x3(1, 3, "1+3布局"),
+    Grid3x3(3, 3, "3x3网格", 9)
-    Grid3x1(3, 1, "3+1布局")
 }

app/src/main/java/com/inspection/camera/ui/merge/MergeScreen.kt

@@ -85,7 +85,9 @@ fun MergeScreen(
     val context = LocalContext.current
     val scope = rememberCoroutineScope()
 
-    val images = remember { mutableStateListOf<Uri>().apply { addAll(imageUris) } }
+    data class ImageWithCache(val uri: Uri, val cachePath: String?)
+    
+    val images = remember { mutableStateListOf<ImageWithCache>() }
     var layoutType by remember { mutableStateOf(MergeLayoutType.Grid2x2) }
     var imageQuality by remember { mutableStateOf(ImageQuality.Standard) }
     var titleStyle by remember { mutableStateOf(WatermarkStyle.Default) }
@@ -97,16 +99,48 @@ fun MergeScreen(
     var showSaveDialog by remember { mutableStateOf(false) }
     var selectedImageIndex by remember { mutableStateOf(-1) }
 
+    // 将 URI 图片复制到缓存目录
+    suspend fun copyImageToCache(uri: android.net.Uri): String? {
+        return withContext(Dispatchers.IO) {
+            try {
+                val input = context.contentResolver.openInputStream(uri) ?: return@withContext null
+                val cacheDir = context.cacheDir
+                val imgDir = java.io.File(cacheDir, "merge_images")
+                if (!imgDir.exists()) {
+                    imgDir.mkdirs()
+                }
+                val fileName = "img_${System.nanoTime()}.jpg"
+                val outFile = java.io.File(imgDir, fileName)
+                java.io.FileOutputStream(outFile).use { output ->
+                    input.use { inStream -> inStream.copyTo(output) }
+                }
+                outFile.absolutePath
+            } catch (e: Exception) {
+                null
+            }
+        }
+    }
+
     // 图片选择器
     val imagePickerLauncher = rememberLauncherForActivityResult(
         contract = ActivityResultContracts.GetMultipleContents()
     ) { uris ->
         if (uris.isNotEmpty()) {
-            if (selectedImageIndex >= 0 && selectedImageIndex < images.size) {
+            scope.launch {
-                images[selectedImageIndex] = uris.first()
+                if (selectedImageIndex >= 0 && selectedImageIndex < images.size) {
-            } else {
+                    // 替换指定位置的图片
-                if (images.size < layoutType.maxImages) {
+                    val path = copyImageToCache(uris.first())
-                    images.addAll(uris.take(layoutType.maxImages - images.size))
+                    if (path != null) {
+                        images[selectedImageIndex] = ImageWithCache(uris.first(), path)
+                    }
+                } else {
+                    // 添加新图片
+                    uris.take(layoutType.maxImages - images.size).forEach { uri ->
+                        val path = copyImageToCache(uri)
+                        if (path != null) {
+                            images.add(ImageWithCache(uri, path))
+                        }
+                    }
                 }
             }
         }
@@ -208,7 +242,7 @@ fun MergeScreen(
                 horizontalArrangement = Arrangement.spacedBy(8.dp),
                 verticalArrangement = Arrangement.spacedBy(8.dp)
             ) {
-                itemsIndexed(images) { index, uri ->
+                itemsIndexed(images) { index, imageWithCache ->
                     Box(
                         modifier = Modifier
                             .aspectRatio(1f)
@@ -221,7 +255,7 @@ fun MergeScreen(
                     ) {
                         AsyncImage(
                             model = ImageRequest.Builder(context)
-                                .data(uri)
+                                .data(imageWithCache.uri)
                                 .crossfade(true)
                                 .build(),
                             contentDescription = null,
@@ -321,11 +355,14 @@ fun MergeScreen(
                     onClick = {
                         scope.launch {
                             previewBitmap = withContext(Dispatchers.Default) {
-                                val imageItems = images.map { uri ->
+                                val imageItems = images.map { img ->
-                                    val path = convertUriToPath(context, uri)
+                                    ImageItem(
-                                    ImageItem(uri = uri, path = path ?: uri.toString())
+                                        uri = img.uri, 
+                                        path = img.cachePath ?: img.uri.toString()
+                                    )
                                 }
                                 ImageProcessor.mergeImages(
+                                    context,
                                     imageItems,
                                     layoutType,
                                     imageQuality
@@ -392,8 +429,14 @@ fun MergeScreen(
                 TextButton(onClick = {
                     scope.launch {
                         val bitmap = withContext(Dispatchers.Default) {
-                            val imageItems = images.map { ImageItem(uri = it, path = it.toString()) }
+                            val imageItems = images.map { img ->
+                                ImageItem(
+                                    uri = img.uri,
+                                    path = img.cachePath ?: img.uri.toString()
+                                )
+                            }
                             ImageProcessor.mergeImages(
+                                context,
                                 imageItems,
                                 layoutType,
                                 imageQuality
@@ -438,11 +481,7 @@ private fun LayoutOption(
 ) {
     val displayText = when (layout) {
         MergeLayoutType.Grid2x2 -> "2x2"
-        MergeLayoutType.Grid1x3 -> "1+3"
+        MergeLayoutType.Grid3x3 -> "3x3"
-        MergeLayoutType.Grid3x1 -> "3+1"
-        MergeLayoutType.Grid1x2 -> "1+2"
-        MergeLayoutType.Grid2x1 -> "2+1"
-        MergeLayoutType.Grid1x1 -> "单图"
     }
 
     Box(
@@ -468,19 +507,3 @@ private fun LayoutOption(
         }
     }
 }
-
-// 将 Content Uri 拷贝到缓存目录，返回本地文件路径（可被 BitmapFactory.decodeFile 使用）
-private suspend fun convertUriToPath(context: android.content.Context, uri: android.net.Uri): String? {
-    return withContext(Dispatchers.IO) {
-        try {
-            val input = context.contentResolver.openInputStream(uri) ?: return@withContext null
-            val tmpFile = java.io.File(context.cacheDir, "img_${System.nanoTime()}.jpg")
-            java.io.FileOutputStream(tmpFile).use { output ->
-                input.use { inStream -> inStream.copyTo(output) }
-            }
-            tmpFile.absolutePath
-        } catch (e: Exception) {
-            null
-        }
-    }
-}