diff --git a/.idea/caches/build_file_checksums.ser b/.idea/caches/build_file_checksums.ser
index 03d5d45..3a03579 100644
Binary files a/.idea/caches/build_file_checksums.ser and b/.idea/caches/build_file_checksums.ser differ
diff --git a/build.gradle b/build.gradle
index 7fd3518..7a2d9f8 100644
--- a/build.gradle
+++ b/build.gradle
@@ -33,5 +33,6 @@ allprojects {
             charSet 'UTF-8'
             links "http://docs.oracle.com/javase/8/docs/api"
         }
+        options.addStringOption('Xdoclint:none', '-quiet')
     }
 }
\ No newline at end of file
diff --git a/lib/src/main/java/com/king/zxing/util/CodeUtils.java b/lib/src/main/java/com/king/zxing/util/CodeUtils.java
index 5180df9..b7bdc90 100644
--- a/lib/src/main/java/com/king/zxing/util/CodeUtils.java
+++ b/lib/src/main/java/com/king/zxing/util/CodeUtils.java
@@ -40,10 +40,8 @@ import com.google.zxing.qrcode.QRCodeReader;
 import com.google.zxing.qrcode.QRCodeWriter;
 import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
 import com.king.zxing.DecodeFormatManager;
-import com.king.zxing.DecodeHintManager;
 
 import java.util.HashMap;
-import java.util.Hashtable;
 import java.util.Map;
 import java.util.Vector;