Android与单片机通信常用数据转换方法
1. 将GB2312转化为中文,如BAFAC2DCB2B7→胡萝卜,两个字节合成一个文字
public static String stringToGbk(String string) throws Exception { byte[] bytes = new byte[string.length() / 2]; for (int j = 0; j < bytes.length; j++) { byte high = Byte.parseByte(string.substring(j * 2, j * 2 + 1), 16); byte low = Byte.parseByte(string.substring(j * 2 + 1, j * 2 + 2), 16); bytes[j] = (byte) (high << 4 | low); } String result = new String(bytes, "GBK"); return result; }
2.将中文转化为GB2312,并且结果以byte[]形式返回,如胡萝卜→new byte[]{BA FA C2 DC B2 B7}，一个字被分为两个字节
public static byte[] gbkToString(String str) throws Exception { return new String(str.getBytes("GBK"), "gb2312").getBytes("gb2312"); }
3.将十六进制的byte[]原封不动的转化为string，如byte[]{0x7e，0x80,0x11,0x20}→7e801120,可用于log打印
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(); }
4.将十六进制的byte[]原封不动的转化为string，并且每个byte之间用空格分开，如byte[]{0x7e，0x80,0x11,0x20}→7e 80 11 20，,可用于log打印
public static StringBuilder byte2HexStr(byte[] data) { if (data != null && data.length > 0) { StringBuilder stringBuilder = new StringBuilder(data.length); for (byte byteChar : data) { stringBuilder.append(String.format("%02X ", byteChar)); } return stringBuilder; } return null; }
5.将byte[]数组转化为8、10、16等各种进制，例如byte[0x11,0x20]→4384，约等于1120（16进制）→4384，radix代表进制
public static String bytesToAllHex(byte[] bytes, int radix) { return new BigInteger(1, bytes).toString(radix);// 这里的1代表正数 }
6.将String的十六进制原封不动转化为byte的十六进制，例如7e20→new byte[]{0x7e，x20}
public static byte[] HexString2Bytes(String src) { byte[] ret = new byte[src.length() / 2]; byte[] tmp = src.getBytes(); for (int i = 0; i < tmp.length / 2; i++) { ret[i] = uniteBytes(tmp[i * 2], tmp[i * 2 + 1]); } return ret; }
public static byte uniteBytes(byte src0, byte src1) { byte _b0 = Byte.decode("0x" + new String(new byte[] { src0 })) .byteValue(); _b0 = (byte) (_b0 << 4); byte _b1 = Byte.decode("0x" + new String(new byte[] { src1 })) .byteValue(); byte ret = (byte) (_b0 ^ _b1); return ret; }
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