Pit of kotlin bit operation (bytes[i] and 0xff error)

java Median operation
    bytes yes byte Array
    bytes[i] & 0xff  （ No abnormality ）
kotlin Cannot be replaced with  
    bytes[i] and 0xff    ( Error report as shown in the figure , Follow the tips to complete the following )
    (bytes[i] and 0xff.toByte()).toInt()   ( This is still a signed number , Failed to meet expectations )
because kotlin Bit operation only for int The type and long type , Need to change to

bytes[i].toInt() and 0xff