Android Utililty Methods Hash Code Calculate

List of utility methods to do Hash Code Calculate

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Description

The list of methods to do Hash Code Calculate are organized into topic(s).

Method

StringgetHashStringFromId(String id)
Create Hash (string) value from id string by using SHA-256 hash algorithm Return null if id is null or functionality is not supported by JVM 
if (id == null)
    return null;
try {
    MessageDigest md = MessageDigest.getInstance("SHA-256");
    md.update(id.getBytes("UTF-8"));
    byte[] digest = md.digest();
    return bytesToHex(digest);
} catch (NoSuchAlgorithmException e) {
...
intgetHexDigit(String s, int i)
get Hex Digit 
char c = s.charAt(i);
if (c >= '0' && c <= '9') {
    return c - '0';
} else if (c >= 'a' && c <= 'f') {
    return c - 'a' + 0xa;
} else if (c >= 'A' && c <= 'F') {
    return c - 'A' + 0xa;
} else {
...
intcreateHash(String title, String URL, String content)
create Hash 
int hash = 1;
hash = hash * 31 + (title == null ? 0 : title.hashCode());
hash = hash * 31 + (URL == null ? 0 : URL.hashCode());
hash = hash * 31 + (content == null ? 0 : content.hashCode());
return hash;
StringcreateHash(String toHash)
create Hash 
String mResult = null;
try {
    MessageDigest mDigest = MessageDigest
            .getInstance(HASH_ALGORITHM);
    mDigest.reset();
    mDigest.update(toHash.getBytes());
    byte[] mBytes = mDigest.digest();
    int mLength = mBytes.length;
...
inthash(int aSeed, boolean aBoolean)
Hash code for boolean primitives. 
return firstTerm(aSeed) + (aBoolean ? 1 : 0);
inthash(int aSeed, char aChar)
Hash code for char primitives. 
return firstTerm(aSeed) + aChar;
inthash(int aSeed, int aInt)
Hash code for int primitives. 
return firstTerm(aSeed) + aInt;
inthash(int aSeed, long aLong)
Hash code for long primitives. 
return firstTerm(aSeed) + (int) (aLong ^ (aLong >>> 32));
inthash(int aSeed, float aFloat)
Hash code for float primitives. 
return hash(aSeed, Float.floatToIntBits(aFloat));
inthash(int aSeed, double aDouble)
Hash code for double primitives. 
return hash(aSeed, Double.doubleToLongBits(aDouble));