android将String转化为MD5的方法+一些String经常使用的方法

public class StringUtils {

	
	public static String MD5Encode(String origin) {
		String resultString = null;
		try {
		    resultString = new String(origin);
		    MessageDigest md = MessageDigest.getInstance("MD5");
		    resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
		}
        catch (Exception ex) {
        
        }
		return resultString;
	}
	
	public static String byteArrayToHexString(byte[] b) {
		StringBuffer resultSb = new StringBuffer();
		for (int i = 0; i < b.length; i++) {
			resultSb.append(byteToHexString(b[i]));
		}
		return resultSb.toString();
	}
	
	
	private static String byteToHexString(byte b) {
		int n = b;
		if (n < 0)
			n = 256 + n;
		int d1 = n / 16;
		int d2 = n % 16;
		return hexDigits[d1] + hexDigits[d2];
	}
	
	private final static String[] hexDigits = {
		"0", "1", "2", "3", "4", "5", "6", "7",
		"8", "9", "a", "b", "c", "d", "e", "f"};

}