[android-developers] Re: MemoryFile - ParcelFileDescriptor

Why not use reflection to get the PFD? There is a method for that in the MemoryFile class.

Op woensdag 4 juli 2012 09:55:32 UTC+2 schreef rtindru het volgende:

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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