安卓中各种数据类型之间的转换

来源：互联网发布：c 游戏编程编辑：程序博客网时间：2024/06/08 04:01
留着以后用，先备份起来。
public class BytesUtil {    private static final char[] hex = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D','E', 'F' };public static int bytes2Integer(byte[] data, int offset, int len) {    // TODO Auto-generated method stub    if((data == null) || (offset < 0) || (len <= 0) || (len + offset > data.length))    {        return -1;    }    int value = 0;    for(int i = 0; i < len; i++)    {        value = value*256 + oneByte2Integer(data[i+offset]);    }    return value;}public static int ascii2Integer(byte[] data, int offset, int len) {    // TODO Auto-generated method stub    if((data == null) || (offset < 0) || (len <= 0) || (len + offset > data.length))    {        return -1;    }    int value = 0;    for(int i = 0; i < len; i++)    {        value = value*10 + oneByte2Integer(data[i+offset])-0x30;    }    return value;}public static int oneByte2Integer(byte b) {    // TODO Auto-generated method stub    return b < 0 ? (b + 256) : b;}public static int BCDtoInteger(byte[] buffer, int offset, int len) {    // TODO Auto-generated method stub    if((buffer == null) || (offset < 0) || (len <= 0) || (buffer.length < offset+len))    {        return -2147483648;    }    int value = 0;    for(int i = offset; i < len+offset; i++)    {        value = (value*10) + ((buffer[i] >>> 4) & 0x0F);        value = (value*10) + (buffer[i] & 0x0F);                }    return value;}//private final static byte[] hex = {0,1,2,3,4,5,6,7,8,9,0xA,0xB,0xC,0xD,0xE,0xF};//"0123456789ABCDEF".getBytes(); // 从字节数组到十六进制字符串转换public static final String bytesToHexStr(byte[] data,int begin,int len,String filling) {    if((data == null) || (begin < 0) || (len <= 0) || (data.length < begin + len))    {        return null;    }    StringBuffer buffer = new StringBuffer(len * 2);    for (int i = begin; i < begin+len; i++)     {        buffer.append(hex[(data[i] >>> 4) & 0x0F]);        buffer.append(hex[data[i] & 0x0F]);        buffer.append(filling);    }    return buffer.toString();}// 从字节数组到十六进制字符串转换public static final String bytesToHexStr(byte[] bcd,int begin,int len) {    if(bcd != null)    {        StringBuffer buffer = new StringBuffer(len * 2);        for (int i = begin; i < begin+len; i++)         {            buffer.append(hex[(bcd[i] >>> 4) & 0x0F]);            buffer.append(hex[bcd[i] & 0x0F]);        }        return buffer.toString();    }    return null;}// 从字节数组到十六进制字符串转换public static String bytesToHexStr(char[] bcd,int begin,int len){    if(bcd != null)    {        StringBuffer buffer = new StringBuffer(len * 2);        for (int i = begin; i < begin+len; i++)         {            buffer.append(hex[(bcd[i] >>> 4) & 0x0F]);            buffer.append(hex[bcd[i] & 0x0F]);        }        return buffer.toString();    }    return null;}public static String byteToHexStr(byte b) {       StringBuffer buffer = new StringBuffer(2);    buffer.append(hex[(b >>> 4) & 0x0F]);    buffer.append(hex[b & 0x0F]);    return buffer.toString();   } public static String byteToHexStr(char b) {       StringBuffer buffer = new StringBuffer(2);    buffer.append(hex[(b >>> 4) & 0x0F]);    buffer.append(hex[b & 0x0F]);    return buffer.toString();    } // 从十六进制字符串到字节数组转换  public static byte[] HexStringToBytes(String hexstr) {      byte[] b = new byte[hexstr.length() / 2];      int j = 0;      for (int i = 0; i < b.length; i++) {          char c0 = hexstr.charAt(j++);          char c1 = hexstr.charAt(j++);          b[i] = (byte) ((parse(c0) << 4) | parse(c1));      }      return b;  }  private static int parse(char c) {      if (c >= 'a')          return (c - 'a' + 10) & 0x0f;      if (c >= 'A')          return (c - 'A' + 10) & 0x0f;      return (c - '0') & 0x0f;  }  public static String bytesToString(byte[] data,int begin,int len,String code){    String str = null;    if(data != null)    {        try         {            if(code != null)            {                str = new String(data,begin,len,code);            }            else             {                str = new String(data,begin,len);            }        }         catch (NullPointerException e)         {            // TODO: handle exception            e.printStackTrace();        } catch (UnsupportedEncodingException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        catch(IndexOutOfBoundsException e)        {            e.printStackTrace();        }    }    return str;}public static String bytesToHexStr(byte[] data, int begin,        int len, int maxLen, String filling){    // TODO Auto-generated method stub    if((data == null) || (begin < 0) || (len <= 0) || (data.length < begin + len) || (maxLen <= 0))    {        return null;    }    StringBuffer buffer = new StringBuffer(len * 2);    for (int i = begin; i < begin+len; i++)     {        buffer.append(hex[(data[i%maxLen] >>> 4) & 0x0F]);        buffer.append(hex[data[i%maxLen] & 0x0F]);        buffer.append(filling);    }    return buffer.toString();}//把高位是拆字的字符数组整合public static byte[] getbytesIntegrate(byte[] data, int sta, int end)                  throws IllegalArgumentException{    // TODO Auto-generated method stub    if((data == null) || (sta < 0) || (end < 0 ))    {        throw new IllegalArgumentException("error");    }    byte[] bytesData=new byte[(end-sta)/2];    for(int i=0;i<bytesData.length;i++)    {        bytesData[i]=(byte) ((data[2*i+sta]&0x0F)*16+(data[2*i+sta+1]&0x0F));    }    return bytesData;}public static int bytesIntegrateToInteger(byte[] data, int offset, int len)                  throws IllegalArgumentException{    byte[] bytesData = getbytesIntegrate(data,offset,offset + len);         if(bytesData != null)    {        return bytes2Integer(bytesData,0,bytesData.length);    }    return 0;}public static int getbytesIntegrate(byte[] out_data,int offset,byte[] data, int sta, int end,int max)                   throws IllegalArgumentException{    // TODO Auto-generated method stub    if((data == null) || (sta < 0) || (end < 0 ) || (out_data == null) || (offset < 0))    {        throw new IllegalArgumentException("error");    }    int len = (end - sta + max) % max;    if(len > data.length)    {        throw new IllegalArgumentException("error");    }    len = len / 2;    if(offset + len > out_data.length)    {        throw new IllegalArgumentException("error");    }    for(int i = 0;i < len;i++)    {        out_data[i+offset]=(byte) ((data[(2 * i + sta) % max] & 0x0F) * 16+(data[(2 * i + sta + 1) % max] & 0x0F));    }    return len;}public static byte[] getBytesExtend(byte[] data) {    // TODO Auto-generated method stub          if(data == null)    {        return null;    }    byte[] bytesData=new byte[data.length*2];    int len = getBytesExtend(bytesData,0,data,0,data.length);    if(len >= 0)    {        return bytesData;    }    else    {        return null;    }}public static int getBytesExtend(byte[] out_data,int offset,byte[] data) {    // TODO Auto-generated method stub    if((out_data == null) || (data == null))    {        return -1;    }    if((offset < 0) || (offset >= out_data.length))    {        return -1;    }    if(out_data.length < offset+data.length*2)    {        return -1;    }    for(int i=0;i<data.length;i++)    {        out_data[2*i+offset]=(byte) (((oneByte2Integer(data[i]) >>> 4) & 0x0F)+0x30);        out_data[2*i+1+offset]=(byte) ((oneByte2Integer(data[i]) & 0x0F)+0x30);    }    return data.length*2;}public static byte getHExtend(byte b) {    // TODO Auto-generated method stub    return (byte) (((b >>> 4) & 0x0F) + 0x30);}public static byte getLExtend(byte b) {    // TODO Auto-generated method stub    return (byte) ((b & 0x0F) + 0x30);}public static int getBytesExtend(byte[] out_data, int out_data_offset, byte[] data,        int offset, int len){    // TODO Auto-generated method stub    if((data == null) || (out_data == null) || (out_data_offset < 0) || (offset < 0) ||            (out_data.length < out_data_offset + 2 * len) || (data.length < offset + len))    {        return -1;    }    for(int i = 0;i < len;i++)    {        out_data[2*i + out_data_offset]=(byte) (((oneByte2Integer(data[i + offset]) >>> 4) & 0x0F)+0x30);        out_data[2*i + 1 + out_data_offset]=(byte) ((oneByte2Integer(data[i + offset]) & 0x0F)+0x30);    }    return 2 * len;}public static String bytesToHexStr(byte[] data){    // TODO Auto-generated method stub    if(data != null)    {        return bytesToHexStr(data,0,data.length);    }    return null;}public static void setBytes(byte charType,byte[]dataBuf){    // TODO Auto-generated method stub    if(dataBuf!=null)    {        int i=0;        for(i=0;i<dataBuf.length;i++)            dataBuf[i]=charType;    }}// 十六进制转换字符串 public static String hexStr2Str(String hexStr)  {        String str = "0123456789ABCDEF";        char[] hexs = hexStr.toCharArray();        byte[] bytes = new byte[hexStr.length() / 2];        int n;        for (int i = 0; i < bytes.length; i++)      {            n = str.indexOf(hexs[2 * i]) * 16;            n += str.indexOf(hexs[2 * i + 1]);            bytes[i] = (byte) (n & 0xff);        }        return new String(bytes);    }}
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