diff --git a/app/build.gradle b/app/build.gradle
index 11978824..3e0ec2b3 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -12,6 +12,7 @@ android {
         targetSdk 28
         ndk { abiFilters "armeabi-v7a" }
         buildConfigField("String", "CLIENT_ID", "\"${clientId}\"")
+        multiDexEnabled true
     }
 
     buildTypes {
diff --git a/app/src/main/java/com/github/catvod/ali/API.java b/app/src/main/java/com/github/catvod/ali/API.java
index dda67f14..c7b59925 100644
--- a/app/src/main/java/com/github/catvod/ali/API.java
+++ b/app/src/main/java/com/github/catvod/ali/API.java
@@ -460,7 +460,7 @@ public class API {
     public Object[] proxySub(Map<String, String> params) throws Exception {
         String fileId = params.get("file_id");
         Response res = OkHttp.newCall(getDownloadUrl(fileId), getHeaderAuth());
-        byte[] body = Utils.getUTF8(res.body().bytes());
+        byte[] body = Utils.toUtf8(res.body().bytes());
         Object[] result = new Object[3];
         result[0] = 200;
         result[1] = "application/octet-stream";
diff --git a/app/src/main/java/com/github/catvod/utils/Utils.java b/app/src/main/java/com/github/catvod/utils/Utils.java
index 4bc10627..7ab81bc2 100644
--- a/app/src/main/java/com/github/catvod/utils/Utils.java
+++ b/app/src/main/java/com/github/catvod/utils/Utils.java
@@ -49,19 +49,15 @@ public class Utils {
         return hasCamera && hasPhone && hasBT;
     }
 
-    public static boolean isGBK(byte[] bytes) {
+    public static boolean isGbk(byte[] bytes) {
         Charset charset = Charset.forName("GBK");
         String str = new String(bytes, charset);
         byte[] newBytes = str.getBytes(charset);
         return Arrays.equals(bytes, newBytes);
     }
 
-    public static byte[] getUTF8(byte[] bytes) throws Exception {
-        if (isGBK(bytes)) {
-            return new String(bytes, Charset.forName("GBK")).getBytes("UTF-8");
-        } else {
-            return bytes;
-        }
+    public static byte[] toUtf8(byte[] bytes) throws Exception {
+        return isGbk(bytes) ? new String(bytes, Charset.forName("GBK")).getBytes("UTF-8") : bytes;
     }
 
     public static boolean isSub(String ext) {