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Android BLE 框架发布,功能全面,简单易用:

https://github.com/a1anwang/okble

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(1)  byte[] 数组转成 16进制字符串

	private final static byte[] hex = "0123456789ABCDEF".getBytes();

	// 从字节数组到十六进制字符串转
	public static String Bytes2HexString(byte[] b) {
		byte[] buff = new byte[2 * b.length];
		for (int i = 0; i < b.length; i++) {
			buff[2 * i] = hex[(b[i] >> 4) & 0x0f];
			buff[2 * i + 1] = hex[b[i] & 0x0f];
		}
		return new String(buff);
	}

        示例：

byte[] bytes_1=new byte[]{(byte) 0xA0,(byte) 0xB1,0x2};
String hexStr=Conversion.Bytes2HexString(bytes_1);
LogUtils.print("hexStr:"+hexStr);

结果：hexStr:A0B102

(2)  16进制字符串转成 byte[] 数组

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;
}

示例：

String strvalue = "A0B102"; 
byte[] bytes_2=Conversion.hexStringToBytes(strvalue);
String hexStr=Conversion.Bytes2HexString(bytes_2);
LogUtils.print("hexStr:"+hexStr);

结果：hexStr:A0B102

(3)  16进制字符串转成  int 整数

public static int hexStrToInt(String valueStr) {
		valueStr = valueStr.toUpperCase();
		if (valueStr.length() % 2 != 0) {
			valueStr = "0" + valueStr;
		}

		int returnValue = 0;

		int length = valueStr.length();

		for (int i = 0; i < length; i++) {

			int value = charToByte(valueStr.charAt(i));

			returnValue += Math.pow(16, length - i - 1) * value;
		}
		return returnValue;
}
public static byte charToByte(char c) {
  return (byte) "0123456789ABCDEF".indexOf(c);
}

String strvalue = "A0B102"; 
int  value=Conversion.hexStrToInt(strvalue);
LogUtils.print("       value:"+value);
LogUtils.print("0xA0B102:"+0xA0B102);

结果：
     hexStr:10531074
   0xA0B102:10531074

(4) int 转16进制

  public static String intToHexStr(int i){
		String hexStr=	Integer.toHexString(i);
		 
		if(hexStr.length()%2!=0){
			hexStr="0"+hexStr;
		}
		return hexStr.toUpperCase();
  }

    示例：

LogUtils.e("TAG", "hexStr:"+Conversion.intToHexStr(10));

hexStr:0A

(5)  byte转bit

public static String byteToBit(byte b) {  
	    return "" +(byte)((b >> 7) & 0x1) +   
	    (byte)((b >> 6) & 0x1) +   
	    (byte)((b >> 5) & 0x1) +   
	    (byte)((b >> 4) & 0x1) +   
	    (byte)((b >> 3) & 0x1) +   
	    (byte)((b >> 2) & 0x1) +   
	    (byte)((b >> 1) & 0x1) +   
	    (byte)((b >> 0) & 0x1);  
}  

public static byte BitToByte(String byteStr) {  
	    int re, len;  
	    if (null == byteStr) {  
	        return 0;  
	    }  
	    len = byteStr.length();  
	    if (len != 4 && len != 8) {  
	        return 0;  
	    }  
	    if (len == 8) {// 8 bit处理  
	        if (byteStr.charAt(0) == '0') {// 正数  
	            re = Integer.parseInt(byteStr, 2);  
	        } else {// 负数  
	            re = Integer.parseInt(byteStr, 2) - 256;  
	        }  
	    } else {//4 bit处理  
	        re = Integer.parseInt(byteStr, 2);  
	    }  
	    return (byte) re;  
} 

(7)  byte[]截取

    public static byte[] subByteArray(byte[] src,int start,int length){


        byte[] result=new byte[length];

        System.arraycopy(src, start, result, 0, length);


        return result;

    }