preface

  • RxjavaDue to itsChain call based on event flow, simple logic & easy to useThe characteristics of the deepAndroidDeveloper welcome.


Making screenshots

If you are not familiar with RxJava, check out Android: a clear and easy-to-understand introduction to RxJava

  • Today, Carson will adopt todayThe way of text and textparsingRxjavaI hope you’ll enjoy it.


Schematic diagram

directory


Schematic diagram

Definition 1.

  • RxJava 在 GitHubIntroduction:
RxJava: A Library for composing Asynchronous and Event-based programs using Observable sequences for the Java VM RxJava is a library that uses observable sequences on the Java VM to compose asynchronous, event-based programsCopy the code
  • Conclusion:RxJavaIs aAsynchronous operation based on event flowIn the library

2. The role

Implementing asynchronous operations

Similar to Android AsyncTask, Handler function

Characteristics of 3.

Since RxJava is used as a chain call based on event flow, it makes RxJava:

  • Logic is concise
  • To achieve elegant
  • Using a simple

More importantly, as the complexity of the program logic increases, it remains simple and elegant

4. Introduction of life examples

I introduce and explain the principle of Rxjava with a life example: a customer comes to a restaurant to eat


Schematic diagram

Schematic diagram

5. Principle introduction

5.1 an overview of the

The Rxjava principle is based on an extended observer pattern with four roles:

role role analogy
Observable Generate events The customer
An Observer Receives the event and gives the response action The kitchen
Subscribe Connect the observed with the observer The waiter
Event The carrier of communication between the observed and the observer dishes

5.2 Description

Customers go to restaurants to have a meal.


Schematic diagram

Schematic diagram

5.3 summarize

The principles of RxJava can be summarized as follows:

  • The observed(observables)By subscribing to(Subscribe) Send events sequentiallyGive the observer(the Observer)
  • The observer(the Observer) Receive events in sequence& Make the corresponding response action. The details are as follows:


Schematic diagram

At this point, the RxJava principle is finished.

6. Summary

  • This paper mainly focuses onRxjavaThe principle of graphic explanation
  • I will continue to publish a series of articles on Rxjava 2.0 for Android, including principles, operators, application scenarios, back pressure, and more


Schematic diagram

Thumb up, please! Because your encouragement is the biggest power that I write!

Related articles reading

  • Android Rxjava: create operator Android Rxjava: create operator Android Rxjava: create operator Android Rxjava: create operator Android Rxjava: create operator Android Rxjava: create operator Android Rxjava: create operator Android Rxjava: create operator Android Rxjava: Android RxJava: A comprehensive tutorial on the functional operators
  • Android RxJava application description: (Unconditional) Network request polling Android RxJava application description: (conditional) Network request polling Android RxJava application description: Network request nested callback Android RxJava: merge data source Android RxJava: merge data from disk/memory cache: merge data from disk/memory cache Android RxJava: Network request error reconnection (Retrofit)

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