Android Question How to manipulate binaries of files?

Erel said:

You cannot treat non-text data as text.

B4XBytesBuilder (B4XCollections) can be useful for such tasks though for a single byte you can do something simpler:

B4X:

Dim data() As Byte = File.ReadBytes(...)
For i = 0 To b.Length - 1
 if Bit.And(0xff, data(i)) = 0x32 Then data(i) = 0x64 'the and is required if the value > 127 because bytes are signed
 Next
File.WriteBytes(...)

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