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I tried the following:
public static final long DEVICE_ID_UNKNOWN = 0xFFFFFFFFFFFFFFFF;
but it causes
The literal 0xFFFFFFFFFFFFFFFF of type int is out of range
Use
0xFFFFFFFFFFFFFFFFland be fine.Another way would be to use simply
-1because this value also has all bits set. See http://en.wikipedia.org/wiki/Two%27s_complement for details.