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Assume :
byte array named byteArray
byte[0] contained the left most 8 bits (bit 25 to bit 32);
then use the following code to convert byteArray to int:
int A = byteArray[0]<<24 | byteArray[1]<<16 | byteArray[2]<<8 | byteArray[3];
Note: the left most bit in primitive type int is a sign bit. Therefore, don't forget to treat the left most bit in byte[0] as sign bit.