diff --git a/app/src/main/java/com/hippo/ehviewer/client/EhEngine.kt b/app/src/main/java/com/hippo/ehviewer/client/EhEngine.kt
index 286a6803f..68ed73d5d 100644
--- a/app/src/main/java/com/hippo/ehviewer/client/EhEngine.kt
+++ b/app/src/main/java/com/hippo/ehviewer/client/EhEngine.kt
@@ -669,7 +669,7 @@ object EhEngine {
                 code = response.code
                 headers = response.headers
                 body = response.body.string()
-                result = ArchiveParser.parse(body)
+                result = ArchiveParser.parse(body)!!
             }
         } catch (e: Throwable) {
             ExceptionUtils.throwIfFatal(e)
diff --git a/app/src/main/java/com/hippo/ehviewer/client/parser/ArchiveParser.kt b/app/src/main/java/com/hippo/ehviewer/client/parser/ArchiveParser.kt
index 5e64e8874..44cc15b1e 100644
--- a/app/src/main/java/com/hippo/ehviewer/client/parser/ArchiveParser.kt
+++ b/app/src/main/java/com/hippo/ehviewer/client/parser/ArchiveParser.kt
@@ -13,199 +13,96 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+package com.hippo.ehviewer.client.parser
 
-package com.hippo.ehviewer.client.parser;
+import com.hippo.ehviewer.R
+import com.hippo.ehviewer.client.exception.NoHAtHClientException
+import org.jsoup.Jsoup
+import java.util.function.IntFunction
+import java.util.regex.Pattern
 
-import androidx.annotation.NonNull;
+object ArchiveParser {
+    private val PATTERN_ARCHIVE_URL =
+        Pattern.compile("<strong>(.*)</strong>.*<a href=\"([^\"]*)\">Click Here To Start Downloading</a>")
+    private val PATTERN_HATH_FORM =
+        Pattern.compile("<form id=\"hathdl_form\" action=\"[^\"]*?or=([^=\"]*?)\" method=\"post\">")
+    private val PATTERN_HATH_ARCHIVE =
+        Pattern.compile("<p><a href=\"[^\"]*\" onclick=\"return do_hathdl\\('([0-9]+|org)'\\)\">([^<]+)</a></p>\\s*<p>([\\w. ]+)</p>\\s*<p>([\\w. ]+)</p>")
+    private val PATTERN_NEED_HATH_CLIENT =
+        Pattern.compile("You must have a H@H client assigned to your account to use this feature\\.")
 
-import com.hippo.ehviewer.R;
-import com.hippo.ehviewer.client.exception.NoHAtHClientException;
-
-import org.jsoup.Jsoup;
-
-import java.util.ArrayList;
-import java.util.List;
-import java.util.Objects;
-import java.util.function.IntFunction;
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
-
-public class ArchiveParser {
-
-    private static final Pattern PATTERN_ARCHIVE_URL = Pattern.compile("<strong>(.*)</strong>.*<a href=\"([^\"]*)\">Click Here To Start Downloading</a>");
-    private static final Pattern PATTERN_HATH_FORM = Pattern.compile("<form id=\"hathdl_form\" action=\"[^\"]*?or=([^=\"]*?)\" method=\"post\">");
-    private static final Pattern PATTERN_HATH_ARCHIVE = Pattern.compile("<p><a href=\"[^\"]*\" onclick=\"return do_hathdl\\('([0-9]+|org)'\\)\">([^<]+)</a></p>\\s*<p>([\\w. ]+)</p>\\s*<p>([\\w. ]+)</p>");
-    private static final Pattern PATTERN_NEED_HATH_CLIENT = Pattern.compile("You must have a H@H client assigned to your account to use this feature\\.");
-
-    public static Result parse(String body) {
-        Matcher m = PATTERN_HATH_FORM.matcher(body);
+    fun parse(body: String?): Result? {
+        body ?: return null
+        var m = PATTERN_HATH_FORM.matcher(body)
         if (!m.find()) {
-            return new Result(null, null);
+            return null
         }
-        String paramOr = m.group(1);
-
-        var archiveList = new ArrayList<Archive>();
-        var d = Jsoup.parse(body);
-        var es = d.select("#db>div>div");
-        for (var e : es) {
+        val paramOr = m.group(1)
+        val archiveList = ArrayList<Archive>()
+        val d = Jsoup.parse(body)
+        val es = d.select("#db>div>div")
+        for (e in es) {
             try {
-                var btn = e.selectFirst("form>div>input");
-                if (!btn.hasAttr("disabled")) {
-                    var res = e.selectFirst("form>input").attr("value");
-                    var name = btn.attr("value");
-                    var size = e.selectFirst("p>strong").text();
-                    var cost = e.selectFirst("div>strong").text().replace(",", "");
-                    var item = new Archive(res, name, size, cost, false);
-                    archiveList.add(item);
+                val btn = e.selectFirst("form>div>input")
+                if (!btn!!.hasAttr("disabled")) {
+                    val res = e.selectFirst("form>input")!!.attr("value")
+                    val name = btn.attr("value")
+                    val size = e.selectFirst("p>strong")!!.text()
+                    val cost = e.selectFirst("div>strong")!!.text().replace(",", "")
+                    val item = Archive(res, name, size, cost, false)
+                    archiveList.add(item)
                 }
-            } catch (NullPointerException ex) {
-                ex.printStackTrace();
+            } catch (ex: NullPointerException) {
+                ex.printStackTrace()
             }
         }
-
-        m = PATTERN_HATH_ARCHIVE.matcher(body);
+        m = PATTERN_HATH_ARCHIVE.matcher(body)
         while (m.find()) {
-            String res = ParserUtils.trim(m.group(1));
-            String name = ParserUtils.trim(m.group(2));
-            String size = ParserUtils.trim(m.group(3));
-            String cost = ParserUtils.trim(m.group(4));
-            var item = new Archive(res, name, size, cost, true);
-            archiveList.add(item);
+            val res = ParserUtils.trim(m.group(1))
+            val name = ParserUtils.trim(m.group(2))
+            val size = ParserUtils.trim(m.group(3))
+            val cost = ParserUtils.trim(m.group(4))
+            val item = Archive(res, name, size, cost, true)
+            archiveList.add(item)
         }
-
-        return new Result(paramOr, archiveList);
+        return Result(paramOr, archiveList)
     }
 
-    public static String parseArchiveUrl(String body) throws NoHAtHClientException {
-        Matcher m = PATTERN_NEED_HATH_CLIENT.matcher(body);
+    @Throws(NoHAtHClientException::class)
+    fun parseArchiveUrl(body: String?): String? {
+        body ?: return null
+        val m = PATTERN_NEED_HATH_CLIENT.matcher(body)
         if (m.find()) {
-            throw new NoHAtHClientException("No H@H client");
-        }
-
-        var d = Jsoup.parse(body);
-        var a = d.selectFirst("#continue>a[href]");
-        if (a != null) {
-            return a.attr("href") + "?start=1";
+            throw NoHAtHClientException("No H@H client")
         }
+        val d = Jsoup.parse(body)
+        val a = d.selectFirst("#continue>a[href]")
+        return if (a != null) {
+            a.attr("href") + "?start=1"
+        } else null
 
         // TODO: Check more errors
-        return null;
     }
 
-    public static final class Archive {
-        private final String res;
-        private final String name;
-        private final String size;
-        private final String cost;
-        private final boolean isHAtH;
-
-        public Archive(String res, String name, String size, String cost, boolean isHAtH) {
-            this.res = res;
-            this.name = name;
-            this.size = size;
-            this.cost = cost;
-            this.isHAtH = isHAtH;
-        }
-
-        public String format(IntFunction<String> getString) {
-            if (isHAtH) {
-                var costStr = cost.equals("Free") ? getString.apply(R.string.archive_free) : cost;
-                return String.format("[H@H] %s [%s] [%s]", name, size, costStr);
+    class Archive(
+        val res: String,
+        val name: String,
+        val size: String,
+        val cost: String,
+        val isHAtH: Boolean
+    ) {
+        fun format(getString: IntFunction<String?>): String {
+            return if (isHAtH) {
+                val costStr = if (cost == "Free") getString.apply(R.string.archive_free) else cost
+                "[H@H] $name [$size] [$costStr]"
             } else {
-                var nameStr = getString.apply(res.equals("org") ? R.string.archive_original : R.string.archive_resample);
-                var costStr = cost.equals("Free!") ? getString.apply(R.string.archive_free) : cost;
-                return String.format("%s [%s] [%s]", nameStr, size, costStr);
+                val nameStr =
+                    getString.apply(if (res == "org") R.string.archive_original else R.string.archive_resample)
+                val costStr = if (cost == "Free!") getString.apply(R.string.archive_free) else cost
+                "$nameStr [$size] [$costStr]"
             }
         }
-
-        public String res() {
-            return res;
-        }
-
-        public String name() {
-            return name;
-        }
-
-        public String size() {
-            return size;
-        }
-
-        public String cost() {
-            return cost;
-        }
-
-        public boolean isHAtH() {
-            return isHAtH;
-        }
-
-        @Override
-        public boolean equals(Object obj) {
-            if (obj == this) return true;
-            if (obj == null || obj.getClass() != this.getClass()) return false;
-            var that = (Archive) obj;
-            return Objects.equals(this.res, that.res) &&
-                    Objects.equals(this.name, that.name) &&
-                    Objects.equals(this.size, that.size) &&
-                    Objects.equals(this.cost, that.cost) &&
-                    this.isHAtH == that.isHAtH;
-        }
-
-        @Override
-        public int hashCode() {
-            return Objects.hash(res, name, size, cost, isHAtH);
-        }
-
-        @NonNull
-        @Override
-        public String toString() {
-            return "Archive[" +
-                    "res=" + res + ", " +
-                    "name=" + name + ", " +
-                    "size=" + size + ", " +
-                    "cost=" + cost + ", " +
-                    "isHAtH=" + isHAtH + ']';
-        }
-
     }
 
-    public static final class Result {
-        private final String paramOr;
-        private final List<Archive> archiveList;
-
-        public Result(String paramOr, List<Archive> archiveList) {
-            this.paramOr = paramOr;
-            this.archiveList = archiveList;
-        }
-
-        public String paramOr() {
-            return paramOr;
-        }
-
-        public List<Archive> archiveList() {
-            return archiveList;
-        }
-
-        @Override
-        public boolean equals(Object obj) {
-            if (obj == this) return true;
-            if (obj == null || obj.getClass() != this.getClass()) return false;
-            var that = (Result) obj;
-            return Objects.equals(this.paramOr, that.paramOr) &&
-                    Objects.equals(this.archiveList, that.archiveList);
-        }
-
-        @Override
-        public int hashCode() {
-            return Objects.hash(paramOr, archiveList);
-        }
-
-        @NonNull
-        @Override
-        public String toString() {
-            return "Result[" +
-                    "paramOr=" + paramOr + ", " +
-                    "archiveList=" + archiveList + ']';
-        }
-
-    }
-}
+    class Result(val paramOr: String?, val archiveList: List<Archive>)
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/hippo/ehviewer/ui/scene/GalleryDetailScene.kt b/app/src/main/java/com/hippo/ehviewer/ui/scene/GalleryDetailScene.kt
index 429718f1d..a3d39ad8b 100755
--- a/app/src/main/java/com/hippo/ehviewer/ui/scene/GalleryDetailScene.kt
+++ b/app/src/main/java/com/hippo/ehviewer/ui/scene/GalleryDetailScene.kt
@@ -1470,7 +1470,7 @@ class GalleryDetailScene : CollapsingToolbarScene(), View.OnClickListener, Downl
             val context = context
             val activity = mainActivity
             if (null != context && null != activity && null != mArchiveList && position < mArchiveList!!.size) {
-                val res = mArchiveList!![position].res()
+                val res = mArchiveList!![position].res
                 val isHAtH = mArchiveList!![position].isHAtH
                 val request = EhRequest()
                 request.setMethod(EhClient.METHOD_DOWNLOAD_ARCHIVE)
@@ -1504,9 +1504,9 @@ class GalleryDetailScene : CollapsingToolbarScene(), View.OnClickListener, Downl
         override fun onSuccess(result: ArchiveParser.Result) {
             if (mRequest != null) {
                 mRequest = null
-                mArchiveFormParamOr = result.paramOr()
-                mArchiveList = result.archiveList()
-                bind(result.archiveList())
+                mArchiveFormParamOr = result.paramOr
+                mArchiveList = result.archiveList
+                bind(result.archiveList)
             }
         }