Скачать или смотреть How to Execute Functions with Variable Delays in RxJava

Learn how to implement a vibration pattern in RxJava that executes functions with variable delays. This guide provides easy-to-follow steps and sample code.
---
This video is based on the question https://stackoverflow.com/q/62663812/ asked by the user 'jashgopani' ( https://stackoverflow.com/u/9355196/ ) and on the answer https://stackoverflow.com/a/62681500/ provided by the user 'TrogDor' ( https://stackoverflow.com/u/2734169/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Execute function before and after variable delay in RxJava in a loop

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Executing Functions with Variable Delays in RxJava: A Step-by-Step Guide

In the world of Android development, you might encounter scenarios where you want to create custom behaviors, such as vibrating a device with a specific pattern. When transitioning from traditional Java to RxJava, it may seem daunting to implement functions with variable delays. This guide aims to clarify the process, showing how to execute a function before and after a variable delay in a loop using RxJava.

Understanding the Problem

You have an array representing a custom vibration pattern in the format {onTime1, offTime1, onTime2, offTime2, ...}. The challenge is to make the device vibrate for onTime milliseconds, pause for offTime milliseconds, and repeat this for the entire pattern. In standard Java, you could achieve this using simple loops and Thread.sleep(). However, an optimal RxJava implementation can streamline this process, especially regarding asynchronous execution.

The Solution: An Efficient RxJava Approach

To solve this problem efficiently with RxJava, follow these structured steps:

1. Create a Flowable for the Delay Pattern

Start by creating a Flowable representing the delay pattern. This Flowable will contain the time intervals for both vibration and rest.

[[See Video to Reveal this Text or Code Snippet]]

2. Create Flowables for On/Off States

Next, generate a second Flowable that contains alternating true and false values. This will indicate whether the vibration should be on or off based on the previous value.

[[See Video to Reveal this Text or Code Snippet]]

3. Zip Both Flowables Together

Once you have both Flowables, you can zip them together. This combines the delay pattern with the on/off states, allowing you to control the vibration based on the current state while considering the delay.

[[See Video to Reveal this Text or Code Snippet]]

4. Concatenate the Nested Flowables

The next step is to concatenate these nested Flowables. By doing so, you ensure that each vibration and pause occurs in the correct sequence defined by your custom pattern.

[[See Video to Reveal this Text or Code Snippet]]

Full Implementation

Here’s how your testVibrate() method should look like combining all the parts:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By converting your loop-based vibration pattern into a reactive paradigm using RxJava, you can handle asynchronous operations more effectively. This method not only makes your code cleaner but also leverages the power of observables to manage threading in a way that aligns with best practices in reactive programming. With the steps provided in this guide, you should be well-equipped to implement and customize vibration patterns in your Android applications efficiently.

Feel free to adapt and extend the example to meet your specific needs! Happy coding!