Reactive Android Development

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Presentation transcript:

Reactive Android Development CS 4593-02T & CS 5463-01T Summer 2016 RxAndroid

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

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

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

Observer Pattern Provides a means of registering for new values

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

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

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

Observables The basic element of Rx Two types: Hot Cold

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

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

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

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

Marble Diagram

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