diff --git a/common/src/main/java/com/xypower/common/FileDownloader.java b/common/src/main/java/com/xypower/common/FileDownloader.java
index cda9054e..47fc1f1d 100644
--- a/common/src/main/java/com/xypower/common/FileDownloader.java
+++ b/common/src/main/java/com/xypower/common/FileDownloader.java
@@ -3,6 +3,8 @@ package com.xypower.common;
 import android.text.TextUtils;
 import android.util.Log;
 
+import org.w3c.dom.Text;
+
 import java.io.Closeable;
 import java.io.File;
 import java.io.FileOutputStream;
@@ -50,7 +52,7 @@ public class FileDownloader {
 
             byte[] buf = new byte[8 * 1024];
 
-            if(encoding.equals("gzip")) {
+            if(TextUtils.equals(encoding, "gzip")) {
                 gZIPInputStream = new GZIPInputStream(is);
                 is = gZIPInputStream;
             }