Replace local Base16Encoder with library

app/build.gradle

@@ -90,6 +90,7 @@ dependencies {
     implementation 'com.getbase:floatingactionbutton:1.10.1'
     implementation 'com.nispok:snackbar:2.11.0'
     implementation 'com.github.aegnor:rencode-java:cb628e824e'
+	implementation 'org.apache.openjpa:openjpa-lib:3.1.1'
     implementation('com.github.afollestad.material-dialogs:core:0.9.6.0@aar') {
         transitive = true
     }

app/src/main/java/org/apache/openjpa/lib/util/Base16Encoder.java

@@ -1,65 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
- */
-package org.apache.openjpa.lib.util;
-
-/**
- * Base 16 encoder.
- *
- * @author Marc Prud'hommeaux
- * @nojavadoc
- */
-public class Base16Encoder {
-
-    private final static char[] HEX = new char[]{
-        '0', '1', '2', '3', '4', '5', '6', '7',
-        '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
-
-    /**
-     * Convert bytes to a base16 string.
-     */
-    public static String encode(byte[] byteArray) {
-        StringBuffer hexBuffer = new StringBuffer(byteArray.length * 2);
-        for (int i = 0; i < byteArray.length; i++)
-            for (int j = 1; j >= 0; j--)
-                hexBuffer.append(HEX[(byteArray[i] >> (j * 4)) & 0xF]);
-        return hexBuffer.toString();
-    }
-
-    /**
-     * Convert a base16 string into a byte array.
-     */
-    public static byte[] decode(String s) {
-        int len = s.length();
-        byte[] r = new byte[len / 2];
-        for (int i = 0; i < r.length; i++) {
-            int digit1 = s.charAt(i * 2), digit2 = s.charAt(i * 2 + 1);
-            if (digit1 >= '0' && digit1 <= '9')
-                digit1 -= '0';
-            else if (digit1 >= 'A' && digit1 <= 'F')
-                digit1 -= 'A' - 10;
-            if (digit2 >= '0' && digit2 <= '9')
-                digit2 -= '0';
-            else if (digit2 >= 'A' && digit2 <= 'F')
-                digit2 -= 'A' - 10;
-
-            r[i] = (byte) ((digit1 << 4) + digit2);
-        }
-        return r;
-    }
-}