content: /*
   * Copyright (C) 2019 AlexMofer
   *
   * Licensed 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 io.github.alexmofer.android.support.utils;
  
  import java.math.BigInteger;
  
  /**
   * 字节工具
   * Created by Alex on 2019/6/26.
   */
  public class ByteUtils {
  
      private ByteUtils() {
          //no instance
      }
  
      /**
       * 转换为16进制
       *
       * @param bytes     数据
       * @param minLength 16进制字符串长度
       * @return 16进制字符串
       */
      public static String toHexString(byte[] bytes, int minLength) {
          if (bytes == null)
              return null;
          final String str = new BigInteger(1, bytes).toString(16);
          final StringBuilder builder = new StringBuilder();
          if (str.length() < minLength) {
              final int number = minLength - str.length();
              for (int i = 0; i < number; i++) {
                  builder.append("0");
              }
          }
          builder.append(str);
          return builder.toString();
      }
  }
  