Convert integer to unsigned byte array with java or android

Question

Hi i have seen many links in SO to convert integer value to unsigned byte array. but i can't able to get clear idea. my conversion is as follows

//in android

int checksum=104396;

byte[] byteArray = GetBytesInt(checksum);

public static byte[] GetBytesInt(int value) {
        byte[] bytes = new byte[4];
        bytes[0] = (byte) (value >> 24);
        bytes[1] = (byte) (value >> 16);
        bytes[2] = (byte) (value >> 8);
        bytes[3] = (byte) (value);
        return bytes;
    }

Output in android
[0,1,-105,-52]

//in c#

uint CheckSum=104396;

byte[] byteArray=BitConverter.GetBytes(CheckSum)

where BitConverter is System method

output in c#

[204,151,1,0]

How i get this output in java or android. I check java 8 and Guava there are returning the same.

please help me with some coding

Output in android. You did not post the code that outputs. — greenapps
– greenapps, Commented Oct 13, 2016 at 9:27
No. I saw the output already of course. But i asked for the code you used to produce the output. How did you print them? — greenapps
– greenapps, Commented Oct 13, 2016 at 9:30
You see that the result is ok? Java and C# produce equal results. Add 256 to negative values in Android. Only the sequence is different. You should consider each byte value as unsigned when printing. — greenapps
– greenapps, Commented Oct 13, 2016 at 9:36

user2634966 · Accepted Answer · 2016-10-20 08:00:47Z

0

As per @greenapps suggestion, Getting byte array in LITTLE_ENDIAN format solved the problem.

ByteBuffer byteBuffer = ByteBuffer.allocate(4);
byteBuffer.order(ByteOrder.LITTLE_ENDIAN);
byteBuffer.putInt((int) (value & 0xffffffffL));
byte[] array=Bytes.asList(byteBuffer.array())

Output in android

[-52,-105,1,0]

answered Oct 20, 2016 at 8:00

user2634966

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