This question already has answers here:
Java Serializable Object to Byte Array
(12 answers)
Closed 8 years ago.
I'm using a GoogleApiClient MessageApi method which accepts an arbitrary payload specified as a byte array.
For my payload I have some strings and a Bitmap that I want to transfer all together in one go.
What options are there available for packaging the strings and bitmaps and converting to a byte array?
A Bitmap can be converted to bytes through copyPixelsToBuffer. A string has getBytes.
Related
This question already has answers here:
Searching for a sequence of Bytes in a Binary File with Java
(5 answers)
Closed 5 years ago.
I come up an idea to read a byte[] array with the same size of the input, and check one by one. But it seems not very efficient. Is there a way to solve it by using rolling hash?
If you are using java 8 or above please check the
java.util.Optional<T>
The documentation is here
Optional
If I got what you mean correctly
This question already has answers here:
How to convert Java String into byte[]?
(9 answers)
Closed 5 years ago.
I have a string which represents an application (converted in bytes and then encoded in base64 -- if you ask yourself why, it is because i am transferring an application from a server to the client, in the hope of rebuilding it when transferred).
How would I get a Byte array back from this string?
String class has what you need (in java, a String is a class)
"this is a string".getBytes();
also take a look at this for base64 decoding of the String
org.apache.commons.codec.binary.Base64
java from 8 and beyond also has a base64 class built-in
java.util.Base64
This question already has answers here:
Java Method with Enforced Array Size Parameters?
(3 answers)
Closed 5 years ago.
I am making a subroutine that will convert a 8-bit binary number into a int value. I want it to take as a parameter a int array with a length of 8 (to represent the binary number) and reject arrays of any other length. Is the possible?
It is not possible to ensure the length of an array at compile time. You have to use
if(my_array.length != 8){
throw new Exception("Array must have a length of 8.");
}
This question already has answers here:
Java code To convert byte to Hexadecimal
(23 answers)
Closed 9 years ago.
I have a MAC address represented as a byte[] in Java and want it as a hexadecimal string, as they are usually represented. How can I do this with as easy as possible?
The byte array has length 6.
Try this:
String hexValue = String.format("%02X:%02X:%02X:%02X:%02X:%02X", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
This question already has answers here:
how to convert image to byte array in java? [duplicate]
(9 answers)
Closed 10 years ago.
AoA. Dear, i need function which can convert an image into binary to store in database and reverse conversion for this binary to image using java.
Use Base64 Class to convert it into String and then store in Database. You can convert it back into image whenever it is required.
http://developer.android.com/reference/android/util/Base64.html