[android-developers] Re: MemoryFile - ParcelFileDescriptor

Why are you using a MemoryFile? If you need to read the file into memory, you could just use a byte[] and byte-arrays are parcelable.

Actually, I'd suggest not reading it into memory a all and just pass the 'Uri uri' from the parcelable producer process to the consumer process and the consumer can read the file.

On Wednesday, July 4, 2012 3:55:32 AM UTC-4, rtindru wrote:

I have an application that needs to Base64 decode on the fly a bitmap image & render it on the ImageView.
I am using a custom content provider to do this. When the openFile method is called - I in this case chose to use a normal non-encoded file for testing purpose.
Now I create a MemoryFile from the imagefile (after decoding) & have to return a ParcelFileDescriptor of the MemoryFile.

I tried reflection & got the FileDescriptor of the MemoryFile but am unable to get the ParcelFileDescriptor from the FileDescriptor
I tried the dup, adoptFD methods but the ParcelFileDescriptor was invalid.
Kindly help me out here.
Cheers
Indru

public ParcelFileDescriptor openFile(Uri uri, String mode)
            throws FileNotFoundException {
        File openFile = new File(uri.toString());
        try {
            MemoryFile file = new MemoryFile(null, (int) openFile.length());
            ParcelFileDescriptor pfd = ParcelFileDescriptor.open(openFile, ParcelFileDescriptor.MODE_READ_ONLY);
            AutoCloseInputStream in = new AutoCloseInputStream(pfd);
            byte[] buffer = new byte[in.available()];
            //Should do decoding here - skipped to test the code
            in.read(buffer, 0, buffer.length);
            file.writeBytes(buffer, 0, 0, buffer.length);
            Method getFileDescriptorMethod = file.getClass().getMethod(
                    "getFileDescriptor");
            FileDescriptor out = (FileDescriptor) getFileDescriptorMethod
                    .invoke(file);
// I have the FD, now how to return a PFD?? Any ideas? dup & adoptFD dont work - the PFD is invalid.

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