The description makes it sound like you wouldn't pass the map at all. You just pass the key. The key is then used to retrieve the object from the map. So the map would have to be somewhere both activities could access. Like an application subclass or a static.
On Nov 16, 9:21 pm, droid_does <[email protected]> wrote: > I am trying to pass a custom object to one activity from another. > There is a guide that I am using that can be found here: > > http://developer.android.com/guide/appendix/faq/framework.html > > What I would like to use is the HashMap of WeakReferences, but the > description isn't clear, at least to me. > > From above URL: > "A HashMap of WeakReferences to Objects > > You can also use a HashMap of WeakReferences to Objects with Long > keys. When an activity wants to pass an object to another activity, it > simply puts the object in the map and sends the key (which is a unique > Long based on a counter or time stamp) to the recipient activity via > intent extras. The recipient activity retrieves the object using this > key." > > My poor attempt: > > MyObject object = new MyObject(); > HashMap map = new HashMap(); > WeakReference reference = new WeakReference(object); > map.put(reference.hashCode(), reference); > > Intent i = new Intent(myIntent); > i.putExtra(map); > > I know this is probably way off but I can't figure out how this is > intended to be implemented based on the description. Are the keys > hashcodes, user defined, or what? It sounds like all that is passed > is a HashMap containing the key values but how is the object retrieved > with just the key? I couldn't find any code examples or useful > documentation on this method of passing objects so any help would be > greatly appreciated. > > Thanks, -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
