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Parcel : Activie Objects
An unusual feature of Parcel is the ability to read and write active objects. For these objects the
actual contents of the object is not written, rather a special token referencing the object is
written. When reading the object back from the Parcel, you do not get a new instance of the
object, but rather a handle that operates on the exact same object that was originally written.
There are two forms of active objects available.
Binder objects are a core facility of Android's general cross-process communication system.
The IBinder interface describes an abstract protocol with a Binder object. Any such interface
can be written in to a Parcel, and upon reading you will receive either the original object
implementing that interface or a special proxy implementation that communicates calls back to
the original object. The methods to use are writeStrongBinder(IBinder),
writeStrongInterface(IInterface), readStrongBinder(), writeBinderArray(IBinder[]),
readBinderArray(IBinder[]), createBinderArray(), writeBinderList(List), readBinderList(List),
createBinderArrayList().
FileDescriptor objects, representing raw Linux file descriptor identifiers, can be written and
ParcelFileDescriptor objects returned to operate on the original file descriptor. The returned file
descriptor is a dup of the original file descriptor: the object and fd is different, but operating on
the same underlying file stream, with the same position, etc. The methods to use are
writeFileDescriptor(FileDescriptor), readFileDescriptor().
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