优化

app/src/main/java/com/sw/inbound/utils/FileUtils.kt

@@ -2,6 +2,8 @@ package com.sw.inbound.utils
 
 import android.content.ContentUris
 import android.content.Context
+import android.graphics.Bitmap
+import android.graphics.BitmapFactory
 import android.net.Uri
 import android.os.Build
 import android.provider.MediaStore
@@ -156,4 +158,45 @@ object FileUtils {
             false
         }
     }
+
+    /**
+     * 将 File 转换为 Bitmap
+     * @param file 图片文件
+     * @param reqWidth 目标宽度（用于采样压缩，0 表示不压缩）
+     * @param reqHeight 目标高度（用于采样压缩，0 表示不压缩）
+     * @return 解码后的 Bitmap，失败返回 null
+     */
+    fun fileToBitmap(file: File, reqWidth: Int = 0, reqHeight: Int = 0): Bitmap? {
+        if (!file.exists() || !file.isFile) return null
+
+        return if (reqWidth > 0 && reqHeight > 0) {
+            // 带采样压缩，避免 OOM
+            val options = BitmapFactory.Options().apply {
+                inJustDecodeBounds = true
+                BitmapFactory.decodeFile(file.absolutePath, this)
+                inSampleSize = calculateInSampleSize(this, reqWidth, reqHeight)
+                inJustDecodeBounds = false
+            }
+            BitmapFactory.decodeFile(file.absolutePath, options)
+        } else {
+            BitmapFactory.decodeFile(file.absolutePath)
+        }
+    }
+
+    /**
+     * 计算采样率
+     */
+    private fun calculateInSampleSize(options: BitmapFactory.Options, reqWidth: Int, reqHeight: Int): Int {
+        val (height, width) = options.outHeight to options.outWidth
+        var inSampleSize = 1
+        if (height > reqHeight || width > reqWidth) {
+            val halfHeight = height / 2
+            val halfWidth = width / 2
+            while (halfHeight / inSampleSize >= reqHeight && halfWidth / inSampleSize >= reqWidth) {
+                inSampleSize *= 2
+            }
+        }
+        return inSampleSize
+    }
+
 }