CODEWITHSUNDEEP
javaandroidarrays
Y2theZ
Y2theZ

Reputation: 10412

Is there a way to convert from byte[] to long[]

I am working on an android application. I was using a static function in a library, that takes byte[] as a parameter.

I used to pass a hard code byte array containing 36 bytes:

new byte[]{-13, 35, -92, -79, 47, -51, -57, 39, ......};

But in the latest release, they changed the function to take a long[] instead. So I can no longer pass my byte array.

How can I convert from my saved byte[] to a long[] in order to still use this function with the same value as before?

Is there a conversion from byte[] to long[] ? To my knowledge 'byte[]' can be converted to long but not to long array.

Any help on this is greatly appreciated

Upvotes: 3

Views: 844

Answers (2)

Pratiyush Kumar Singh
Pratiyush Kumar Singh

Reputation: 1997

It is one of the simplest question you should have tried it id IDE.

    byte[] bytesArr = { 0, 6, 36, -84, 113, 125, -118, -47 };
    long[] longArr = new long[bytesArr.length];

    for (int i = 0; i < bytesArr.length; i++) {
        longArr[i] = bytesArr[i];
    }

Also, it is possible to convert long[] to byte[] but you will loose all values which are not in range of byte i.e. -128 to 127.

Upvotes: 0

J. Dow
J. Dow

Reputation: 563

I guess you will need to convert 4 bytes to one long. So the most simple solution would be using ByteBuffers.

long[] byteToLong(byte[] array) {
     ByteBuffer byteBuffer = ByteBuffer.wrap(array);
     LongBuffer longBuffer = byteBuffer.asLongBuffer();
     long[] result = new long[longBuffer.capacity()];
     longBuffer.get(result);
     return result;
}

Note: this produces BigEndian values - not sure what your API needs.

Upvotes: 1

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