There are many problems with memory exceptions with bitmaps on Android, many of which are discussed on stackoverflow. It would probably be best if you went through the existing questions to see if yours matches one of the existing ones, then if not, write up what makes your situation different.
Some examples:
Out of memory exception due to large bitmap sizeOut of memory exception due to large bitmap size
Android: out of memory exception in GalleryAndroid: out of memory exception in Gallery
Android handling out of memory exception on image processingAndroid handling out of memory exception on image processing
etc: http://stackoverflow.com/search?q=android+out+of+memory+exception+bitmaphttps://stackoverflow.com/search?q=android+out+of+memory+exception+bitmap
