android GBK转UTF-8出现乱码问题解决方法

好痛苦啊，正式的，干嘛不弄一个统一的编码，转过来转过去的，好麻烦。

 public byte[] gbk2utf8(String chenese){

    char c[] = chenese.toCharArray();
            byte [] fullByte =new byte[3*c.length];
            for(int i=0; i<c.length; i++){
             int m = (int)c[i];
             String word = Integer.toBinaryString(m);
            // System.out.println(word);
             
             StringBuffer sb = new StringBuffer();
             int len = 16 - word.length();
             //补零
             for(int j=0; j<len; j++){
              sb.append("0");
             }
             sb.append(word);
             sb.insert(0, "1110");
             sb.insert(8, "10");
             sb.insert(16, "10");
             
//             System.out.println(sb.toString());
             
             String s1 = sb.substring(0, 8);          
             String s2 = sb.substring(8, 16);          
             String s3 = sb.substring(16);
             
             byte b0 = Integer.valueOf(s1, 2).byteValue();
             byte b1 = Integer.valueOf(s2, 2).byteValue();
             byte b2 = Integer.valueOf(s3, 2).byteValue();
             byte[] bf = new byte[3];
             bf[0] = b0;
             fullByte[i*3] = bf[0];
             bf[1] = b1;
             fullByte[i*3+1] = bf[1];
             bf[2] = b2;
             fullByte[i*3+2] = bf[2];
             
            }
            return fullByte;
    }