diff --git a/app/src/main/java/com/android/grape/net/Api.kt b/app/src/main/java/com/android/grape/net/Api.kt
new file mode 100644
index 0000000..6e481ca
--- /dev/null
+++ b/app/src/main/java/com/android/grape/net/Api.kt
@@ -0,0 +1,70 @@
+package com.android.grape.net
+
+import android.util.Log
+import com.android.grape.pad.Pad
+import com.android.grape.pad.PadTask
+import com.android.grape.pad.TaskDetail
+import com.google.gson.Gson
+import com.google.gson.reflect.TypeToken
+import org.json.JSONArray
+import org.json.JSONObject
+
+object Api {
+    private const val TAG = "Api"
+    const val UPDATE_PAD: String = "/openapi/open/pad/updatePadProperties"
+    const val PAD_DETAIL: String = "/openapi/open/pad/padDetails"
+    const val PAD_TASK: String = "/task-center/open/task/padTaskDetail"
+
+
+    fun padDetail(): ApiResponse<Pad>{
+        val param = Gson().toJson(mapOf(
+            "page" to 1,
+            "rows" to 10,
+            "padCode" to listOf("ACP250702PWJCTLF")
+        ))
+        val (response, code) = HttpUtils.postSync(PAD_DETAIL, param)
+        if (code == 200) {
+            Log.d("padDetail", response.toString())
+            var apiResponse: ApiResponse<Pad> =  Gson().fromJson(response, object : TypeToken<ApiResponse<Pad>>() {}.type)
+            return apiResponse
+        } else {
+            Log.d("padDetail", "error: $code")
+            return ApiResponse(code, "error", 0, null)
+        }
+    }
+
+    fun updatePad(params: String): ApiResponseList<PadTask>{
+        val (response, code) = HttpUtils.postSync(UPDATE_PAD, params)
+        if (code == 200) {
+            Log.d("updatePad", response.toString())
+            var apiResponse: ApiResponseList<PadTask> = Gson().fromJson(response, object : TypeToken<ApiResponseList<PadTask>>() {}.type)
+            return apiResponse
+        } else {
+            Log.d("updatePad", "error: $code")
+            return ApiResponseList(code, "error", 0, emptyList())
+        }
+    }
+
+    fun padTaskDetail(taskId: Int): Int{
+        val jsonString = JSONObject().apply {
+            put("taskIds", JSONArray().apply {
+                put(taskId)
+            })
+        }.toString()
+        Log.d(TAG, "padTaskDetail: $jsonString")
+        val (response, code) = HttpUtils.postSync(PAD_TASK, jsonString)
+        if (code == 200) {
+            Log.d("padTaskDetail", response.toString())
+            var apiResponse: ApiResponseList<TaskDetail> = Gson().fromJson(response, object : TypeToken<ApiResponseList<TaskDetail>>() {}.type)
+            val taskList = apiResponse.data
+            if (apiResponse.isSuccess() && taskList!= null && taskList.isNotEmpty()){
+                val task = taskList[0]
+                return task.taskStatus
+            }
+            return -1
+        }else {
+            Log.d("padTaskDetail", "error: $code")
+            return -1
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/android/grape/net/ApiResponse.kt b/app/src/main/java/com/android/grape/net/ApiResponse.kt
new file mode 100644
index 0000000..b8dd473
--- /dev/null
+++ b/app/src/main/java/com/android/grape/net/ApiResponse.kt
@@ -0,0 +1,23 @@
+package com.android.grape.net
+
+data class ApiResponse<T>(
+    val code: Int,
+    val message: String,
+    val ts: Long,
+    var data: T? = null
+){
+    fun isSuccess(): Boolean {
+        return code == 200
+    }
+}
+
+data class ApiResponseList<T>(
+    val code: Int,
+    val message: String,
+    val ts: Long,
+    var data: List<T>? = null
+){
+    fun isSuccess(): Boolean {
+        return code == 200
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/android/grape/net/ArmCloudSignatureV2.kt b/app/src/main/java/com/android/grape/net/ArmCloudSignatureV2.kt
new file mode 100644
index 0000000..143829f
--- /dev/null
+++ b/app/src/main/java/com/android/grape/net/ArmCloudSignatureV2.kt
@@ -0,0 +1,39 @@
+package com.android.grape.net
+
+import android.util.Log
+import java.nio.charset.StandardCharsets
+import javax.crypto.Mac
+import javax.crypto.spec.SecretKeySpec
+
+
+object ArmCloudSignatureV2 {
+    const val ALGORITHM: String = "HmacSHA256"
+    const val SECRET_KEY: String = "gz8f1u0t63byzdu6ozbx8r5qs3e5lipt"
+    const val SECRET_ID: String = "3yc8c8bg1dym0zaiwjh867al"
+
+    @Throws(Exception::class)
+    fun calculateSignature(
+        timestamp: String?,
+        path: String,
+        body: String?,
+        secretKey: String = SECRET_ID
+    ): String {
+        val stringToSign = timestamp + path + (body ?: "")
+        Log.d("TAG", "calculateSignature: $stringToSign")
+        val hmacSha256 = Mac.getInstance(ALGORITHM)
+        val secretKeySpec = SecretKeySpec(secretKey.toByteArray(StandardCharsets.UTF_8), ALGORITHM)
+        hmacSha256.init(secretKeySpec)
+        val hash = hmacSha256.doFinal(stringToSign.toByteArray(StandardCharsets.UTF_8))
+        return bytesToHex(hash)
+    }
+
+    private fun bytesToHex(bytes: ByteArray): String {
+        val hexString = StringBuilder()
+        for (b in bytes) {
+            val hex = Integer.toHexString(0xff and b.toInt())
+            if (hex.length == 1) hexString.append('0')
+            hexString.append(hex)
+        }
+        return hexString.toString()
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/android/grape/pad/DcInfo.kt b/app/src/main/java/com/android/grape/pad/DcInfo.kt
new file mode 100644
index 0000000..83c9c52
--- /dev/null
+++ b/app/src/main/java/com/android/grape/pad/DcInfo.kt
@@ -0,0 +1,14 @@
+package com.android.grape.pad
+
+
+import com.google.gson.annotations.SerializedName
+
+data class DcInfo(
+    var area: String = "",
+    var dcCode: String = "",
+    var dcName: String = "",
+    var ossEndpoint: String = "",
+    var ossEndpointInternal: String = "",
+    var ossFileEndpoint: String = "",
+    var ossScreenshotEndpoint: String = ""
+)
\ No newline at end of file
diff --git a/app/src/main/java/com/android/grape/pad/Pad.kt b/app/src/main/java/com/android/grape/pad/Pad.kt
new file mode 100644
index 0000000..d89c811
--- /dev/null
+++ b/app/src/main/java/com/android/grape/pad/Pad.kt
@@ -0,0 +1,13 @@
+package com.android.grape.pad
+
+
+import com.google.gson.annotations.SerializedName
+
+data class Pad(
+    var page: Int = 0,
+    var pageData: List<PageData> = listOf(),
+    var rows: Int = 0,
+    var size: Int = 0,
+    var total: Int = 0,
+    var totalPage: Int = 0
+)
\ No newline at end of file
diff --git a/app/src/main/java/com/android/grape/pad/PadTask.kt b/app/src/main/java/com/android/grape/pad/PadTask.kt
new file mode 100644
index 0000000..2c20f61
--- /dev/null
+++ b/app/src/main/java/com/android/grape/pad/PadTask.kt
@@ -0,0 +1,10 @@
+package com.android.grape.pad
+
+
+import com.google.gson.annotations.SerializedName
+
+data class PadTask(
+    var padCode: String = "",
+    var taskId: Int = 0,
+    var vmStatus: Int = 0
+)
\ No newline at end of file
diff --git a/app/src/main/java/com/android/grape/pad/PageData.kt b/app/src/main/java/com/android/grape/pad/PageData.kt
new file mode 100644
index 0000000..21d1fac
--- /dev/null
+++ b/app/src/main/java/com/android/grape/pad/PageData.kt
@@ -0,0 +1,17 @@
+package com.android.grape.pad
+
+
+import com.google.gson.annotations.SerializedName
+
+data class PageData(
+    var dataSize: Long = 0,
+    var dataSizeUsed: Long = 0,
+    var dcInfo: DcInfo = DcInfo(),
+    var deviceLevel: String = "",
+    var deviceStatus: Int = 0,
+    var imageId: String = "",
+    var online: Int = 0,
+    var padCode: String = "",
+    var padStatus: Int = 0,
+    var streamStatus: Int = 0
+)
\ No newline at end of file
diff --git a/app/src/main/java/com/android/grape/pad/TaskDetail.kt b/app/src/main/java/com/android/grape/pad/TaskDetail.kt
new file mode 100644
index 0000000..7a62ce6
--- /dev/null
+++ b/app/src/main/java/com/android/grape/pad/TaskDetail.kt
@@ -0,0 +1,14 @@
+package com.android.grape.pad
+
+
+import com.google.gson.annotations.SerializedName
+
+data class TaskDetail(
+    var endTime: Long = 0,
+    var errorMsg: String = "",
+    var padCode: String = "",
+    var taskContent: Any? = Any(),
+    var taskId: Int = 0,
+    var taskResult: Any? = Any(),
+    var taskStatus: Int = 0
+)
\ No newline at end of file
diff --git a/app/src/main/java/com/android/grape/util/AndroidFileDownloader.kt b/app/src/main/java/com/android/grape/util/AndroidFileDownloader.kt
new file mode 100644
index 0000000..17375cb
--- /dev/null
+++ b/app/src/main/java/com/android/grape/util/AndroidFileDownloader.kt
@@ -0,0 +1,128 @@
+package com.android.grape.util
+
+import android.content.Context
+import android.os.Environment
+import androidx.core.content.ContextCompat
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+import okhttp3.OkHttpClient
+import okhttp3.Request
+import java.io.File
+import java.io.FileOutputStream
+import java.io.IOException
+import java.io.InputStream
+
+class AndroidFileDownloader(private val context: Context) {
+
+    private val client = OkHttpClient()
+
+    /**
+     * 下载文件到指定路径
+     *
+     * @param url 文件下载URL
+     * @param relativePath 相对于外部存储目录的路径（如 "Downloads/MyApp/file.zip"）
+     * @param fileName 文件名（可选，如未提供则从URL提取）
+     * @param progressCallback 进度回调
+     * @param completionCallback 完成回调
+     */
+    fun downloadFile(
+        url: String,
+        relativePath: String,
+        fileName: String? = null,
+    ): Boolean {
+            try {
+                // 检查存储权限
+                if (!hasStoragePermission()) {
+                    throw IOException("缺少存储权限")
+                }
+
+                // 获取目标文件
+                val file = getOutputFile(relativePath, fileName ?: extractFileName(url))
+
+                // 确保目录存在
+                file.parentFile?.let { parentDir ->
+                    if (!parentDir.exists()) {
+                        val dirsCreated = parentDir.mkdirs()
+                        if (!dirsCreated) {
+                            throw IOException("无法创建目录: ${parentDir.absolutePath}")
+                        }
+                    }
+                }
+
+                val request = Request.Builder()
+                    .url(url)
+                    .build()
+
+                client.newCall(request).execute().use { response ->
+                    if (!response.isSuccessful) {
+                        throw IOException("下载失败: ${response.code} ${response.message}")
+                    }
+
+                    val body = response.body ?: throw IOException("响应体为空")
+                    val totalBytes = body.contentLength()
+
+                    // 写入文件
+                    body.byteStream().use { inputStream ->
+                        FileOutputStream(file).use { outputStream ->
+                            copyStreamWithProgress(inputStream, outputStream, totalBytes)
+                        }
+                    }
+                    return true
+                }
+            } catch (e: Exception) {
+                e.printStackTrace()
+                return false
+            }
+    }
+
+    /**
+     * 检查存储权限
+     */
+    private fun hasStoragePermission(): Boolean {
+        return ContextCompat.checkSelfPermission(
+            context,
+            android.Manifest.permission.WRITE_EXTERNAL_STORAGE
+        ) == android.content.pm.PackageManager.PERMISSION_GRANTED
+    }
+
+    /**
+     * 获取输出文件路径
+     */
+    private fun getOutputFile(relativePath: String, fileName: String): File {
+        val baseDir = context.getExternalFilesDir(null)
+            ?: Environment.getExternalStorageDirectory()
+            ?: throw IOException("无法访问外部存储")
+
+        return File(baseDir, "$relativePath/$fileName")
+    }
+
+    /**
+     * 从URL提取文件名
+     */
+    private fun extractFileName(url: String): String {
+        return url.substringAfterLast('/').takeIf { it.isNotBlank() } ?: "downloaded_file"
+    }
+
+    /**
+     * 带进度回调的流复制
+     */
+    private fun copyStreamWithProgress(
+        inputStream: InputStream,
+        outputStream: FileOutputStream,
+        totalBytes: Long?,
+        progressCallback: ((Long, Long?) -> Unit)? = null
+    ) {
+        val buffer = ByteArray(4096)
+        var bytesCopied = 0L
+        var bytesRead: Int
+
+        while (inputStream.read(buffer).also { bytesRead = it } != -1) {
+            outputStream.write(buffer, 0, bytesRead)
+            bytesCopied += bytesRead
+            progressCallback?.invoke(bytesCopied, totalBytes)
+        }
+
+        outputStream.flush()
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/android/grape/util/TimeZoneUtils.kt b/app/src/main/java/com/android/grape/util/TimeZoneUtils.kt
new file mode 100644
index 0000000..8d2166d
--- /dev/null
+++ b/app/src/main/java/com/android/grape/util/TimeZoneUtils.kt
@@ -0,0 +1,69 @@
+package com.android.grape.util
+
+import android.content.Context
+import java.util.*
+import kotlin.math.abs
+
+object TimeZoneUtils {
+
+    /**
+     * 从偏移时间获取最匹配的时区ID
+     *
+     * @param offsetMillis 时区偏移（毫秒）
+     * @param useDaylight 是否考虑夏令时
+     */
+    fun getBestMatchTimeZoneId(offsetMillis: Int, useDaylight: Boolean = false): String {
+        val availableIds = TimeZone.getAvailableIDs()
+
+        // 首选：完全匹配的时区
+        availableIds.firstOrNull { id ->
+            val tz = TimeZone.getTimeZone(id)
+            if (useDaylight) {
+                tz.getOffset(System.currentTimeMillis()) == offsetMillis
+            } else {
+                tz.rawOffset == offsetMillis
+            }
+        }?.let { return it }
+
+        // 次选：最接近的时区
+        return availableIds.minByOrNull { id ->
+            val tz = TimeZone.getTimeZone(id)
+            val diff = if (useDaylight) {
+                abs(tz.getOffset(System.currentTimeMillis()) - offsetMillis)
+            } else {
+                abs(tz.rawOffset - offsetMillis)
+            }
+            diff
+        } ?: TimeZone.getDefault().id
+    }
+
+    /**
+     * 获取时区偏移的格式化字符串
+     */
+    fun formatTimeZoneOffset(offsetMillis: Int): String {
+        val hours = offsetMillis / (1000 * 60 * 60)
+        val minutes = abs(offsetMillis) / (1000 * 60) % 60
+
+        return when {
+            hours > 0 -> String.format("UTC+%d:%02d", hours, minutes)
+            hours < 0 -> String.format("UTC%d:%02d", hours, minutes) // 自动显示负号
+            else -> "UTC"
+        }
+    }
+
+    /**
+     * 从设备获取当前时区偏移
+     */
+    fun getCurrentTimeZoneOffset(): Int {
+        return TimeZone.getDefault().getOffset(System.currentTimeMillis())
+    }
+
+    /**
+     * 将时间转换为指定时区偏移的时间
+     */
+    fun convertTimeToOffset(time: Date, targetOffsetMillis: Int): Date {
+        val currentOffset = TimeZone.getDefault().getOffset(time.time)
+        val diff = targetOffsetMillis - currentOffset
+        return Date(time.time + diff)
+    }
+}
\ No newline at end of file