diff --git a/app/src/main/kotlin/top/fatweb/oxygen/toolbox/ui/view/ToolViewScreen.kt b/app/src/main/kotlin/top/fatweb/oxygen/toolbox/ui/view/ToolViewScreen.kt
index 8d62652..76caa0c 100644
--- a/app/src/main/kotlin/top/fatweb/oxygen/toolbox/ui/view/ToolViewScreen.kt
+++ b/app/src/main/kotlin/top/fatweb/oxygen/toolbox/ui/view/ToolViewScreen.kt
@@ -225,7 +225,7 @@ private fun initWebView(
     webview.settings.javaScriptEnabled = true
     webview.settings.domStorageEnabled = true
     webview.addJavascriptInterface(
-        NativeWebApi(context = context, webView = webview, permissionLauncher),
+        NativeWebApi(context = context, permissionLauncher = permissionLauncher),
         "NativeApi"
     )
     webview.setDownloadListener { url, userAgent, _, mimetype, _ ->
diff --git a/app/src/main/kotlin/top/fatweb/oxygen/toolbox/util/FileUtils.kt b/app/src/main/kotlin/top/fatweb/oxygen/toolbox/util/FileUtils.kt
new file mode 100644
index 0000000..c058ed4
--- /dev/null
+++ b/app/src/main/kotlin/top/fatweb/oxygen/toolbox/util/FileUtils.kt
@@ -0,0 +1,95 @@
+package top.fatweb.oxygen.toolbox.util
+
+import android.content.ContentValues
+import android.content.Context
+import android.os.Build
+import android.os.Environment
+import android.provider.MediaStore
+import androidx.activity.compose.ManagedActivityResultLauncher
+import androidx.annotation.RequiresApi
+import kotlinx.coroutines.runBlocking
+import timber.log.Timber
+import java.io.File
+import java.io.FileOutputStream
+import java.io.IOException
+import kotlin.let
+
+fun saveToDownloads(
+    context: Context,
+    permissionLauncher: ManagedActivityResultLauncher<String, Boolean>,
+    data: ByteArray,
+    fileName: String
+) = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+    saveFileToDownloads(context = context, data = data, fileName = fileName)
+} else {
+    saveFileToDownloads(
+        context = context,
+        permissionLauncher = permissionLauncher,
+        data = data,
+        fileName = fileName
+    )
+}
+
+@RequiresApi(Build.VERSION_CODES.Q)
+private fun saveFileToDownloads(
+    context: Context,
+    data: ByteArray,
+    fileName: String
+): Boolean {
+    val resolver = context.contentResolver
+
+    val contentValues = ContentValues().apply {
+        put(MediaStore.Downloads.DISPLAY_NAME, fileName)
+        put(MediaStore.Downloads.MIME_TYPE, "application/octet-stream")
+        put(MediaStore.Downloads.IS_PENDING, 1)
+    }
+
+    val collection = MediaStore.Downloads.getContentUri(MediaStore.VOLUME_EXTERNAL_PRIMARY)
+    val fileUri = resolver.insert(collection, contentValues)
+
+    return fileUri?.let { uri ->
+        resolver.openOutputStream(uri)?.use { outputStream ->
+            outputStream.write(data)
+            outputStream.flush()
+        }
+
+        contentValues.clear()
+        contentValues.put(MediaStore.Downloads.IS_PENDING, 0)
+        resolver.update(uri, contentValues, null, null)
+        true
+    } ?: run {
+        Timber.e("Could not save file $fileName to Downloads")
+        false
+    }
+}
+
+private fun saveFileToDownloads(
+    context: Context,
+    permissionLauncher: ManagedActivityResultLauncher<String, Boolean>,
+    data: ByteArray,
+    fileName: String
+): Boolean {
+    if (!runBlocking {
+            Permissions.requestWriteExternalStoragePermission(
+                context,
+                permissionLauncher
+            )
+        }) {
+        return false
+    }
+
+    val downloadsDir =
+        Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS)
+    val file = File(downloadsDir, fileName)
+
+    return try {
+        FileOutputStream(file).apply {
+            write(data)
+            close()
+        }
+        true
+    } catch (e: IOException) {
+        Timber.e(e, "Could not save file $fileName to ${file.absolutePath}")
+        false
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/kotlin/top/fatweb/oxygen/toolbox/util/NativeWebApi.kt b/app/src/main/kotlin/top/fatweb/oxygen/toolbox/util/NativeWebApi.kt
index cab0360..a9c3f8d 100644
--- a/app/src/main/kotlin/top/fatweb/oxygen/toolbox/util/NativeWebApi.kt
+++ b/app/src/main/kotlin/top/fatweb/oxygen/toolbox/util/NativeWebApi.kt
@@ -2,26 +2,14 @@ package top.fatweb.oxygen.toolbox.util
 
 import android.content.ClipData
 import android.content.ClipboardManager
-import android.content.ContentValues
 import android.content.Context
 import android.content.Context.CLIPBOARD_SERVICE
-import android.os.Build
-import android.os.Environment
-import android.provider.MediaStore
 import android.util.Base64
 import android.webkit.JavascriptInterface
-import android.webkit.WebView
 import androidx.activity.compose.ManagedActivityResultLauncher
-import androidx.annotation.RequiresApi
-import kotlinx.coroutines.runBlocking
-import timber.log.Timber
-import java.io.File
-import java.io.FileOutputStream
-import java.io.IOException
 
 class NativeWebApi(
     private val context: Context,
-    private val webView: WebView,
     private val permissionLauncher: ManagedActivityResultLauncher<String, Boolean>
 ) {
     @JavascriptInterface
@@ -43,66 +31,11 @@ class NativeWebApi(
     fun saveToDownloads(dataBase64: String, fileName: String): Boolean {
         val data = Base64.decode(dataBase64, Base64.DEFAULT)
 
-        return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
-            saveFileToDownloads(data = data, fileName = fileName)
-        } else {
-            saveFileToExternalDownloads(data = data, fileName = fileName)
-        }
-    }
-
-    @RequiresApi(Build.VERSION_CODES.Q)
-    private fun saveFileToDownloads(data: ByteArray, fileName: String): Boolean {
-        val resolver = context.contentResolver
-
-        val contentValues = ContentValues().apply {
-            put(MediaStore.Downloads.DISPLAY_NAME, fileName)
-            put(MediaStore.Downloads.MIME_TYPE, "application/octet-stream")
-            put(MediaStore.Downloads.IS_PENDING, 1)
-        }
-
-        val collection = MediaStore.Downloads.getContentUri(MediaStore.VOLUME_EXTERNAL_PRIMARY)
-        val fileUri = resolver.insert(collection, contentValues)
-
-        return fileUri?.let { uri ->
-            resolver.openOutputStream(uri)?.use { outputStream ->
-                outputStream.write(data)
-                outputStream.flush()
-            }
-
-            contentValues.clear()
-            contentValues.put(MediaStore.Downloads.IS_PENDING, 0)
-            resolver.update(uri, contentValues, null, null)
-            true
-        } ?: let {
-            Timber.e("Could not save file $fileName to Downloads")
-            false
-        }
-    }
-
-    private fun saveFileToExternalDownloads(data: ByteArray, fileName: String): Boolean {
-        if (!runBlocking { Permissions.requestWriteExternalStoragePermission(context, permissionLauncher) }) {
-            return false
-        }
-
-        val downloadsDir =
-            Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS)
-        val file = File(downloadsDir, fileName)
-
-        return try {
-            FileOutputStream(file).apply {
-                write(data)
-                close()
-            }
-            true
-        } catch (e: IOException) {
-            Timber.e(e, "Could not save file $fileName to ${file.absolutePath}")
-            false
-        }
-    }
-
-    private fun callback(callback: String, vararg args: Any) {
-        val jsCode =
-            "$callback(${args.map { if (it is String) "'$it'" else it }.joinToString(", ")})"
-        webView.evaluateJavascript(jsCode, null)
+        return saveToDownloads(
+            context = context,
+            permissionLauncher = permissionLauncher,
+            data = data,
+            fileName = fileName
+        )
     }
 }
\ No newline at end of file