识别图片处理、查询菜品数据

2025-10-17 14:47:28 +08:00
parent dd51448aea
commit a27cc5f7ee
10 changed files with 221 additions and 31 deletions
@@ -0,0 +1,38 @@
+package com.sw.dualscreen.utils
+import android.graphics.Bitmap
+
+object BitmapCropper {
+    /**
+     * 裁剪Bitmap中心区域为指定尺寸
+     * @param original 原始Bitmap
+     * @param targetWidth 目标宽度
+     * @param targetHeight 目标高度
+     * @return 裁剪后的Bitmap
+     */
+    fun cropCenter(original: Bitmap, targetWidth: Int, targetHeight: Int): Bitmap {
+        val originalWidth = original.width
+        val originalHeight = original.height
+        
+        // 计算中心点坐标
+        var startX = (originalWidth - targetWidth) / 2
+        var startY = (originalHeight - targetHeight) / 2
+        
+        // 边界检查
+        startX = startX.coerceAtLeast(0)
+        startY = startY.coerceAtLeast(0)
+        val actualWidth = minOf(targetWidth, originalWidth - startX)
+        val actualHeight = minOf(targetHeight, originalHeight - startY)
+        
+        return Bitmap.createBitmap(original, startX, startY, actualWidth, actualHeight)
+    }
+}
+
+// 使用示例
+fun main() {
+    // 假设这是从资源加载的Bitmap
+    val originalBitmap = Bitmap.createBitmap(1000, 1000, Bitmap.Config.ARGB_8888)
+    
+    // 裁剪中心500x500区域
+    val croppedBitmap = BitmapCropper.cropCenter(originalBitmap, 500, 500)
+    println("裁剪后尺寸：${croppedBitmap.width}x${croppedBitmap.height}")
+}
@@ -0,0 +1,53 @@
+package com.sw.dualscreen.utils
+import android.content.Context
+import android.graphics.Bitmap
+import android.os.Environment
+import java.io.File
+import java.io.FileOutputStream
+import java.io.IOException
+
+object BitmapSaver {
+    // 保存到公共目录（需WRITE_EXTERNAL_STORAGE权限）
+    fun saveToPublicDirectory(
+        bitmap: Bitmap,
+        folderName: String = Environment.DIRECTORY_PICTURES,
+        fileName: String,
+        format: Bitmap.CompressFormat = Bitmap.CompressFormat.PNG,
+        quality: Int = 100
+    ): File? {
+        val dir = Environment.getExternalStoragePublicDirectory(folderName)
+        if (!dir.exists()) dir.mkdirs()
+        
+        return saveBitmap(bitmap, File(dir, fileName), format, quality)
+    }
+
+    // 保存到应用私有目录（无需权限）
+    fun saveToAppFilesDir(
+        bitmap: Bitmap,
+        context: Context,
+        fileName: String,
+        format: Bitmap.CompressFormat = Bitmap.CompressFormat.JPEG,
+        quality: Int = 100
+    ): File? {
+        val dir = context.getExternalFilesDir(null)
+        return saveBitmap(bitmap, File(dir, fileName), format, quality)
+    }
+
+    private fun saveBitmap(
+        bitmap: Bitmap,
+        outputFile: File,
+        format: Bitmap.CompressFormat,
+        quality: Int
+    ): File? {
+        return try {
+            FileOutputStream(outputFile).use { fos ->
+                bitmap.compress(format, quality, fos)
+                fos.flush()
+            }
+            outputFile
+        } catch (e: IOException) {
+            e.printStackTrace()
+            null
+        }
+    }
+}