android 数据类型转换大全

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import android.text.TextUtils;import android.util.Log;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import java.io.InputStream;/** * Created by snake on 2016/10/11. */public class UtilsDataConversion {    private static final String TAG = "UtilsDataConversion";    //    /**     * 字节到字符转换     *     * @param b     * @return     */    public static char getChar(byte[] b, int index) {        int s = 0;        if (b[index + 1] > 0)            s += b[index + 1];        else            s += 256 + b[index + 0];        s *= 256;        if (b[index + 0] > 0)            s += b[index + 1];        else            s += 256 + b[index + 0];        char ch = (char) s;        return ch;    }    /**     * 将一个2个字节数组转换为intt。     *     * @param b     * @return     */    public static int bytesTwo2Int(byte[] b) {        int a1 = b[0] & 0xff;        int a2 = (b[1] & 0xff) * 256;        return (a1 + a2);    }    /**     * 将一个4个字节数组转换为int。     *     * @param b     * @return     */    public static int bytesFour2Int(byte[] b) {        int a1 = b[0] & 0xff;        int a2 = (b[1] & 0xff) * 256;        int a3 = (b[2] & 0xff) * 65536;        int a4 = (b[3] & 0xff) * 16777216;        return (a1 + a2 + a3 + a4);    }    public static String ten2sixteen(long ten) {        return Long.toHexString(ten);    }    public static byte[] long2Bytes(long num) {        byte[] byteNum = new byte[8];        for (int ix = 0; ix < 8; ++ix) {            int offset = 64 - (ix + 1) * 8;            byteNum[ix] = (byte) ((num >> offset) & 0xff);        }        return byteNum;    }    public static byte[] int2Bytes(int num) {        byte[] byteNum = new byte[4];        for (int ix = 0; ix < 4; ++ix) {            int offset = 32 - (ix + 1) * 8;            byteNum[ix] = (byte) ((num >> offset) & 0xff);        }        byte[] byte_result = new byte[] { byteNum[3], byteNum[2] };        return byte_result;    }    /**     * Convert hex string to byte[]     *     * @param hexString     *            the hex string     * @return byte[]     */    public static byte[] hexStringToBytes(String hexString) {        if (hexString == null || hexString.equals("")) {            return null;        }        hexString = hexString.toUpperCase();        int length = hexString.length() / 2;        char[] hexChars = hexString.toCharArray();        byte[] d = new byte[length];        for (int i = 0; i < length; i++) {            int pos = i * 2;            d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));        }        return d;    }    /**     * Convert char to byte     *     * @param c     *            char     * @return byte     */    private static byte charToByte(char c) {        return (byte) "0123456789ABCDEF".indexOf(c);    }    /**     * ascii to string     *     * @param value     * @return     */    public static String asciiToString(String value) {        StringBuffer sbu = new StringBuffer();        String[] chars = value.split(",");        for (int i = 0; i < chars.length; i++) {            sbu.append((char) Integer.parseInt(chars[i]));        }        return sbu.toString();    }    /**     * string to ascii     *     * @param value     * @return     */    public static String stringToAscii(String value) {        StringBuffer sbu = new StringBuffer();        char[] chars = value.toCharArray();        for (int i = 0; i < chars.length; i++) {            if (i != chars.length - 1) {                sbu.append((int) chars[i]).append(",");            } else {                sbu.append((int) chars[i]);            }        }        return sbu.toString();    }    @SuppressWarnings({ "resource" })    public static byte[] getByte(File file) {        byte[] bytes = null;        if (file != null) {            try {                InputStream is = new FileInputStream(file);                int length = (int) file.length();                Log.d(TAG, "the file length is= " + length);                if (length > Integer.MAX_VALUE) {                    System.out.println("this file is max");                    return null;                }                bytes = new byte[length];                int offset = 0;                int numRead = 0;                while (offset == 0) {                    offset += numRead;                }                if (offset != length) {                    System.out.println("file length is error");                    return null;                }                is.close();            } catch (FileNotFoundException e) {                // TODO Auto-generated catch block                e.printStackTrace();            } catch (IOException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }        }        return bytes;    }    public static String bytesToHexString(byte[] src) {        StringBuilder stringBuilder = new StringBuilder("");        if (src == null || src.length <= 0) {            return null;        }        for (int i = 0; i < src.length; i++) {            int v = src[i] & 0xFF;            String hv = Integer.toHexString(v);            if (hv.length() < 2) {                stringBuilder.append(0);            }            stringBuilder.append(hv);        }        return stringBuilder.toString();    }    /**     * 十六进制转换字符串     *     * @param  hexStr str Byte字符串(Byte之间无分隔符 如:[616C6B])     * @return String 对应的字符串     */    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);    }    /**     * 十六进制转二进制     * @修改者     * @param a     * @return     */    public static String HToB(String a) {        String b = Integer.toBinaryString(Integer.valueOf(toD(a, 16)));        return b;    }    /**     * 二进制转十六进制     * @修改者     * @param a     * @return     */    public static String BToH(String a) {      /* 将二进制转为十进制再从十进制转为十六进制*/        String b = Integer.toHexString(Integer.valueOf(toD(a, 2)));        return b;    }    /**     * 任意进制数转为十进制数     * @修改者     * @param a     * @param b     * @return     */    public static String toD(String a, int b) {        int r = 0;        for (int i = 0; i < a.length(); i++) {            r = (int) (r + formatting(a.substring(i, i + 1))                    * Math.pow(b, a.length() - i - 1));        }        return String.valueOf(r);    }    /**     * 将十六进制中的字母转为对应的数字     * @修改者     * @param a     * @return     */    public static int formatting(String a) {        int i = 0;        for (int u = 0; u < 10; u++) {            if (a.equals(String.valueOf(u))) {                i = u;            }        }        if (a.equals("a")) {            i = 10;        }        if (a.equals("b")) {            i = 11;        }        if (a.equals("c")) {            i = 12;        }        if (a.equals("d")) {            i = 13;        }        if (a.equals("e")) {            i = 14;        }        if (a.equals("f")) {            i = 15;        }        return i;    }    /**     * 将十进制中的数字转为十六进制对应的字母     * @修改者     * @param a     * @return     */    public static String formattingH(int a) {        String i = String.valueOf(a);        switch (a) {            case 10:                i = "a";                break;            case 11:                i = "b";                break;            case 12:                i = "c";                break;            case 13:                i = "d";                break;            case 14:                i = "e";                break;            case 15:                i = "f";                break;        }        return i;    }    /**     * 添加字符串长度到purLen长度,添加内容为0;     * @修改者     * @param str     * @param purLen     * @return     */    public static String appendStrLen(String str, int purLen){        if(TextUtils.isEmpty(str) || str.length() >= purLen){            return str;        }        StringBuffer sb = new StringBuffer();        int subLen = purLen - str.length();        for (int i = 0; i < subLen; i++) {            sb.append("0");        }        sb.append(str);        return sb.toString();    }}

上述是我整理出来的一些数据转换， 各位读者如有补充的 请给我留言，我会及时跟新补充，在此统一感谢。

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