No need to make it so complicated.....
Subclass Application, add your objects, getters and setters.
On 2/4/2016 12:51 PM, Kostya Vasilyev wrote:
No need to make it so complicated.
Since you mentioned that your objects aren't parcelable -- we're
talking about sharing data between various places all within same
process (VM).
You can just pass them around the way you normally would between
methods / classes.
To make it cleaned, I'd look into some kind of "event bus" where some
objects can subscribe to abstract "changes" and others can send these
"change notifications".
Can be something like JavaRX or an "event bus", for example:
http://greenrobot.org/eventbus/
( I haven't used this, but the principle is the same )
-- K
2016-02-04 21:40 GMT+03:00 Massimo Del Zotto <[email protected]
<mailto:[email protected]>>:
Hello,
In my program I need to pass 'live' Objects from one activity to
another. Those are most likely not parcelable and most likely not
just data. I figured out I could use a local Service to provide a
cross-Activity data sharing. It's just a map from unique ids to
Object. Initial experimentation went great.
However, I am having serious trouble with a difference between the
back and the up button.
The application is set up as follows: there's a MainMenu Activity
which launches the service by means of bindService(...,
BIND_AUTO_CREATE). Other "inner" activities bind by
bindService(..., 0). They unbind on onDestroy, mostly because I'm
lazy.
Now, because of the way I have setup activities, the up and the
back buttons should be equivalent. And indeed they are. Sort of.
When I push the back 'hardware' button I have: onPause, onStop,
onDestroy as expected. Here, I de-register the callback and... at
a certain point I got a huge error by pushing the 'back' button
relating to a leaking window created in my onServiceDisconnect.
Indeed, I show an error dialog when this happens with the only
option being calling finish().
I figured out I needed to keep track of unbinding status. It was
my understanding onServiceDisconnect wouldn't get called when I
unregister... it turns out the 'back' button produces this
sequence of calls: onPause, onServiceDisconnected,
onServiceConnected (MainMenu), onStop, onDestroy.
*Is anyone aware of this difference and why does that happen?* As
a side note, this implies Binders should be passed around (in
MainMenu) with care as they can go stale. Not really a big problem
but something to keep in mind.
I'm trying to devise a solution. For the time being, I'll think
I'll resolve to 'instant service connections' so I bind, do what I
need and unbind right away. I might do that in an AsyncTask in
case... *isn't that an hammer solution?* I totally missed about
this difference in documentation and I'm confused on how to use
services correctly at this point.
Elaborations are welcome.
Massimo
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