R Ravichandran wrote:
> I was experimenting with extending the Intent class but don't seem to
> make it work properly. I am wondering if extending is even possible.
> Here is the snippets.
>
> Code for custom intent:
>
> public class MyIntent extends Intent {
>
> private MyClass myClass;
>
> public MyIntent(String name, MyClass myClass) {
> super(name);
> this.myClass = myClass;
> }
>
> public MyClass getMyClass() {
> return myClass;
> }
>
> }
>
>
> Code for Intent broadcast:
>
> MyClass myClass = new MyClass();
> Intent intent = new MyIntent("my_intent",myClass);
> sendBroadcast(intent);
>
> Code for BroadcastReceiver.onReceive(Intent intent):
>
> MyClass myClass = null;
> if(intent instanceof MyIntent) {
> // do something
> }
> else {
> // probelm...
> }
>
> When this application runs, I don't see the MyIntent received properly.
> In fact, 'intent instanceof MyIntent' seems to return false.
>
> What is wrong?
Intents are designed to go between processes.
Let's suppose that you were broadcasting a MyIntent, and it was received
by another application, not written by you. Since it was not written by
you and runs in its own process, it does not have access to the MyIntent
class and therefore could not create an instance of that class.
The Intent system uses some form of serialization (perhaps Parcelable)
to transport Intents between processes. What your experiment
demonstrates is that the same mechanism is used even within the same
process.
--
Mark Murphy (a Commons Guy)
http://commonsware.com | http://twitter.com/commonsguy
Android 1.5 Programming Books: http://commonsware.com/books.html
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