Flatten a generic object in to a parcel. The given Object value may currently be one of the following types:

• null
• String
• Byte
• Short
• Integer
• Long
• Float
• Double
• Boolean
• String[]
• boolean[]
• byte[]
• int[]
• long[]
• Object[] (supporting objects of the same type defined here).
• Android.OS.Bundle
• Map (as supported by Parcel.WriteMap(IDictionary)).
• Any object that implements the Android.OS.Parcelable protocol.
• Parcelable[]
• CharSequence (as supported by Android.Text.TextUtils.WriteToParcel(Java.Lang.ICharSequence, Android.OS.Parcel, Android.OS.Parcel)).
• List (as supported by Parcel.WriteList(IList)).
• Android.Util.SparseArray`1 (as supported by Parcel.writeSparseArray(android.util.SparseArray<java.lang.Object>)).
• Android.OS.BinderConsts
• Any object that implements Serializable (but see Parcel.WriteSerializable(Java.IO.ISerializable) for caveats). Note that all of the previous types have relatively efficient implementations for writing to a Parcel; having to rely on the generic serialization approach is much less efficient and should be avoided whenever possible.

Android.OS.Parcelable objects are written with Parcelable.writeToParcel(android.os.Parcel, int) using contextual flags of 0. When serializing objects containing Android.OS.ParcelFileDescriptors, this may result in file descriptor leaks when they are returned from Binder calls (where Parcelable.ParcelableWriteReturnValue should be used).

[Android Documentation]