connect to the file using ByteArrayOutputStream

HII, how do I get a txt file, form the device using ByteArrayOutputStream and ByteArrayInputStream?

I suspect you are asking the wrong question here.

ByteArrayOutputStream, is just a stream that you give to a process, then when it's over, you can extract all of the bytes written to this stream.

ByteArrayInputStream is just a stream, you give an array of bytes, then it will provide the bytes of the byte array to the reader.

There is nothing specific in these classes dealing with the reading and writing of a file.

You try to read a file from the SD card?  If so, review the FileConnection API.  There are a large number of samples autour.

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