[android-developers] java.lang.UnsupportedOperationException: getBlob is not supported

I want to return a BLOB as a row in a MatrixCursor, however I get the following error

05-24 19:20:42.850: E/AndroidRuntime(22661): java.lang.UnsupportedOperationException: getBlob is not supported

on top of this stack trace

05-24 19:20:42.850: E/AndroidRuntime(22661): at android.database.AbstractCursor.getBlob(AbstractCursor.java:61)
05-24 19:20:42.850: E/AndroidRuntime(22661): at android.database.CursorWrapper.getBlob(CursorWrapper.java:143)
05-24 19:20:42.850: E/AndroidRuntime(22661): at net.winterroot.android.rhus.RhusMapActivity$OverlayDelegate.onTap(RhusMapActivity.java:139)


MatrixCursor itself DOES seem to implement getBlob(), but the call seems to be hitting the AbstractCursor method and not the MatrixCursor method (why ???)


Casting the cursor to MatrixCursor seems like one possible solution but it gives a ClassCastException (also don't really understand why this is, since I'm definitely returning a MatrixCursor).


What is the canonical solution to this issue? I've searched a lot on the internet, and have found some info on creating a custom cursor (tried it, same casting issues as MatrixCursor) or making my own implementation of AbstractCursor (not clear how to do it, since this means somehow globally replacing AbstractCursor.java )


I've also switch to Android 4.0.3, and at least on my 2.3.3 phone I still get these same exceptions. Please give some pointers if you can, this is really frustrating. There must be some way to just return a blob in a cursor, right????


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