[android-developers] can't find the deactivate() function on MemoryFile class

Hi,

I'm importing this project from another file, and everything else goes well except for this strange piece of code snippet

CODE: SELECT ALL

               MemoryFile memoryFile = new MemoryFile(null, length);
               memoryFile.writeBytes(buffer, 0, 0, length);
               memoryFile.deactivate();
               return AssetFileDescriptor.fromMemoryFile(memoryFile);

eclipse complains that deactivate function does not exist in the MemoryFile class,
as well as AssetFileDescriptor not having the fromMemoryFile function.
This is strange because according to the documentation, deactivateand fromMemoryFile functions exist.
But the SDK can't seem to find them, or the android.jar doesn't seem to contain them.

I changed the "Project Build Target" on Properties->Android from Android 2.1 to 2.3 but the problem persists.
I also did a wide search on the net, but oddly enough, "nobody" has ever asked on the same problem.

Any advice? 
Thanks. 

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