How to determine the size of the file and the pixel of an image?

How to determine the size of the file and the pixel of an image?

1 MB is 2 ^ 20 bytes. It is easy to represent long:

final long MegaByte = 1048576L; //1048576 is 2^20 and L denotes that this is a long
if(fileConn.fileSize() > MegaByte)
{
do something here
}

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