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I am in a problem - i need to read SecretKey from Android APK (e.g. key.keystore), for my app it has to be read as a FileInputStream, but from assets I am getting only inputStream. How to convert inputStream to FileInputStream? Or is there any other way, how to acces file from e.g. resources as a fileInputStream?

Thanks

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Why do you need a FileInputStream specifically? In general, you don't have to care about the underlying implementation of the InputStream, you just read from it. Maybe your implementation should be InputStream agnostic.

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You are right, 16hours of programming in a row make me mad :-)
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I think you are referring to AssetManager.open() that returns an InputStream. There is no need to "convert" it to a FileInputStream, just get the reference to the InputStream and use it (wrap it in a BufferedInputStream if you want).

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I don't think this is possible because a FileInputStream is simply a InputStream for Files. It does the job of getting an InputStream from the defined file for you, after that you're working with a normal InputStream.

Android already did this Job for you. So why do you need a FileInputStream?

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You may want a FileInputStream as you want to know the length of the file unless there is a way I haven't yet found.
I don't see any getLength()-method on FileInputStream, so not sure what you're getting at. Also, if it's an asset that you put into the APK, you know it's file size. The FileInputStream is just a convenient way of getting a InputStream (to read the files content) from a "physical" file.
Sorry @Lukas-Knuth, I was confusing myself! However I am using the FileInputStream of an uncompressed resource in order to read in its data in full: AssetFileDescriptor afd = context.getResources().openRawResourceFd(R.raw.myresource); FileInputStream fis = afd.createInputStream(); data = new byte[(int)afd.getLength()]; DataInputStream dis = new DataInputStream(fis); dis.readFully(data); dis.close();

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