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app/src/main/java/com/sw/dualscreen/utils/CameraHelper.kt

@@ -0,0 +1,68 @@
+package com.sw.dualscreen.utils
+
+import android.content.Context
+import android.net.Uri
+import android.provider.OpenableColumns
+import android.widget.Toast
+import androidx.activity.result.ActivityResultCaller
+import androidx.activity.result.ActivityResultLauncher
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.core.content.FileProvider
+import java.io.File
+import java.io.FileOutputStream
+
+/**
+ * 简洁相机工具类
+ * 调用系统相机拍照并返回照片路径
+ */
+class CameraHelper(
+    private val context: Context,
+    caller: ActivityResultCaller,
+    private val authority: String,
+    private val onResult: (uri: Uri, filePath: String?) -> Unit
+) {
+
+    private lateinit var imageUri: Uri
+    private val takePictureLauncher: ActivityResultLauncher<Uri>
+
+    init {
+        takePictureLauncher =
+            caller.registerForActivityResult(ActivityResultContracts.TakePicture()) { success ->
+                if (success) {
+                    val path = getRealPathFromUri(context, imageUri)
+                    onResult(imageUri, path)
+                } else {
+                    Toast.makeText(context, "拍照取消", Toast.LENGTH_SHORT).show()
+                }
+            }
+    }
+
+    /** 打开系统相机 */
+    fun openCamera() {
+        // 1. 创建存储图片的文件
+        val photoFile = File(context.externalCacheDir, "IMG_${System.currentTimeMillis()}.jpg")
+        photoFile.parentFile?.mkdirs() // 确保目录存在
+
+        // 2. 生成 content:// Uri
+        imageUri = FileProvider.getUriForFile(context, authority, photoFile)
+
+        // 3. 启动相机
+        takePictureLauncher.launch(imageUri)
+    }
+
+    /** 可选：将 content:// 转为实际路径 */
+    private fun getRealPathFromUri(context: Context, uri: Uri): String? {
+        var filePath: String? = null
+        context.contentResolver.query(uri, null, null, null, null)?.use { cursor ->
+            val nameIndex = cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME)
+            cursor.moveToFirst()
+            val fileName = cursor.getString(nameIndex)
+            val file = File(context.cacheDir, fileName)
+            context.contentResolver.openInputStream(uri)?.use { input ->
+                FileOutputStream(file).use { output -> input.copyTo(output) }
+            }
+            filePath = file.absolutePath
+        }
+        return filePath
+    }
+}

app/src/main/java/com/sw/dualscreen/utils/FloatBase64Utils.kt

@@ -0,0 +1,47 @@
+package com.example.utils
+
+import android.util.Base64
+import java.nio.ByteBuffer
+import java.nio.ByteOrder
+
+/**
+ * 工具类：float[] 与 Base64 字符串互转
+ * 无需外部依赖，适用于 Android 原生项目。
+ */
+object FloatBase64Utils {
+
+    /**
+     * float数组 → Base64字符串
+     * @param values FloatArray
+     * @return Base64字符串（无换行）
+     */
+    fun floatArrayToBase64(values: FloatArray): String {
+        if (values.isEmpty()) return ""
+
+        val buffer = ByteBuffer.allocate(values.size * 4)
+        buffer.order(ByteOrder.BIG_ENDIAN) // 默认大端序，可改 LITTLE_ENDIAN
+        values.forEach { buffer.putFloat(it) }
+
+        val bytes = buffer.array()
+        return Base64.encodeToString(bytes, Base64.NO_WRAP)
+    }
+
+    /**
+     * Base64字符串 → float数组
+     * @param base64 Base64字符串
+     * @return FloatArray
+     */
+    fun base64ToFloatArray(base64: String?): FloatArray {
+        if (base64.isNullOrEmpty()) return FloatArray(0)
+
+        val bytes = Base64.decode(base64, Base64.NO_WRAP)
+        val buffer = ByteBuffer.wrap(bytes)
+        buffer.order(ByteOrder.BIG_ENDIAN)
+
+        val result = FloatArray(bytes.size / 4)
+        for (i in result.indices) {
+            result[i] = buffer.getFloat()
+        }
+        return result
+    }
+}

app/src/main/java/com/sw/dualscreen/utils/ImageUtil.kt

@@ -4,6 +4,12 @@ import android.content.Context
 import android.graphics.Bitmap
 import android.graphics.BitmapFactory
 import android.net.Uri
+import okhttp3.MediaType.Companion.toMediaTypeOrNull
+import okhttp3.MultipartBody
+import okhttp3.RequestBody
+import java.io.File
+import java.io.FileOutputStream
+import java.io.InputStream
 
 object ImageUtil {
 
@@ -18,4 +24,24 @@ object ImageUtil {
         }
     }
 
+    fun uriToMultipart(context: Context, uri: Uri, partName: String): MultipartBody.Part? {
+        try {
+            val contentResolver = context.contentResolver
+            val inputStream: InputStream = contentResolver.openInputStream(uri) ?: return null
+
+            // 临时文件（避免直接访问SAF文件）
+            val tempFile = File.createTempFile("upload_", ".jpg", context.cacheDir)
+
+            val outputStream = FileOutputStream(tempFile)
+            inputStream.copyTo(outputStream)
+            inputStream.close()
+            outputStream.close()
+
+            val requestFile = RequestBody.create("image/*".toMediaTypeOrNull(), tempFile)
+            return MultipartBody.Part.createFormData(partName, tempFile.name, requestFile)
+        } catch (e: Exception) {
+            e.printStackTrace()
+            return null
+        }
+    }
 }