[android-developers] Read and write file at same time?

hi,

I just want to play one file from sdcard which is in encrypted
format.so i need to first decrypt the file and then play the
file.rightnow i am decrypting the whole file and then play and it
works fine.but what i want is when there is enough data write to
decrypted file just start to play it and write operation to decrypted
file should not be interrupted.

can anyone suggest me the way to deal which above situation?

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