1. Reactive Android Development
CS T & CS T
Summer 2016
RxAndroid

2. Iterators
Provide a consistent interface to accessing the elements of arbitrary data structures.

3. Iterators
Provide a consistent interface to accessing the elements of arbitrary data structures.
<setup>
For(<type> e : E) {
<update logic> }
<finish>

4. Iterators Example: arithmetic mean Integer sum = 0;
For(Integer e : A) {
sum += e; }
Integer average = sum / A.size();

5. Observer Pattern
Provides a means of registering for new values

6. Rx Additions to Observer Pattern
Provides a means of registering for new values
And
A means of signaling that no more values are coming
A means of signaling that an error occurred

7. Rx Additions to Observer Pattern
Provides a means of registering for new values
And
A means of signaling that no more values are coming
A means of signaling that an error occurred
Without using Optional or Either

8. Reactive Replacement for Iterators
With these additions, a listener can perform an action similar to that of iteration on data that is arriving asynchronously.

9. Observables
The basic element of Rx
Two types:
Hot
Cold

10. Observables The basic element of Rx Two types: Hot Cold
Comparable to Sodium Streams
Cold

11. Observables The basic element of Rx Two types: Hot Cold
Comparable to Sodium Streams
Cold
Delivers data from a fixed source whenever anyone subscribes

12. Observables The basic element of Rx Two types: Hot Cold
Comparable to Sodium Streams
Cold
Delivers data from a fixed source whenever anyone subscribes
Starting from the beginning

13. Observables The basic element of Rx Two types: Hot Cold
Comparable to Sodium Streams
Cold
Delivers data from a fixed source whenever anyone subscribes
Starting from the beginning
Can be handy for experimenting

14. Marble Diagram

15. Resources http://rxmarbles.com http://reactivex.io
Interactive marble diagrams (when not on iOS, apparently!)
The 'Docs' menu at the top provides links