--- title: "Alexandru Cristescu (@acristescu) | Hashnode" description: "Doing Android-y stuff. Read the latest articles by Alexandru Cristescu on Hashnode." url: "https://hashnode.com/@acristescu" --- @acristescu # Alexandru Cristescu @acristescu · London, UK · Joined December 2022 Doing Android-y stuff ### [Using the Jetpack Compose's VisualTransformation to create a credit card text input](https://zenandroid.hashnode.dev/using-the-jetpack-composes-visualtransformation-to-create-a-credit-card-text-input?utm_source=hashnode&utm_medium=feed) In this article we're going to look at how to create a fully-featured text edit field specifically for inputting credit card information. We're going to do this by leveraging the VisualTransformation mechanism of Jetpack Compose's TextField. The repo... 5 min read · [zenandroid.hashnode.dev](https://zenandroid.hashnode.dev/using-the-jetpack-composes-visualtransformation-to-create-a-credit-card-text-input?utm_source=hashnode&utm_medium=feed) [Aug 12, 2021](https://hashnode.com/posts/using-the-jetpack-composes-visualtransformation-to-create-a-credit-card-text-input/63aa1695b1011ed9ec6d62e8) ### [Monitoring WebSockets with Stetho](https://zenandroid.hashnode.dev/monitoring-websockets-with-stetho?utm_source=hashnode&utm_medium=feed) In this article I'm going to discuss how you can extend the functionality of Facebook's excellent Stetho library to debug WebSockets connections on Android. While Stetho allows you to inspect HTTP(S) requests, SQLite databases and Shared Preferences ... 4 min read · [zenandroid.hashnode.dev](https://zenandroid.hashnode.dev/monitoring-websockets-with-stetho?utm_source=hashnode&utm_medium=feed) [Jan 21, 2019](https://hashnode.com/posts/monitoring-websockets-with-stetho/63aa16a0b1011ed9ec6d62eb) ### [Mobile animations with Lottie](https://zenandroid.hashnode.dev/mobile-animations-with-lottie?utm_source=hashnode&utm_medium=feed) In this article I'm going to briefly review what options we have for animations for mobile apps in early 2018 and investigate the new kid on the block, the Lottie animation library from Airbnb. There will be a code sample available in this repo. What... 6 min read · [zenandroid.hashnode.dev](https://zenandroid.hashnode.dev/mobile-animations-with-lottie?utm_source=hashnode&utm_medium=feed) [May 4, 2018](https://hashnode.com/posts/mobile-animations-with-lottie/63aa16b7b1011ed9ec6d62ee) ### [Building complex Android animations with RxJava](https://zenandroid.hashnode.dev/building-complex-android-animations-with-rxjava?utm_source=hashnode&utm_medium=feed) In this article I'm going to discuss a little technique I am using to choreograph complex animations on Android by leveraging the power of RxJava. I'm going to show how it can result in clean and simple code that communicates intent and hides the boi... 8 min read · [zenandroid.hashnode.dev](https://zenandroid.hashnode.dev/building-complex-android-animations-with-rxjava?utm_source=hashnode&utm_medium=feed) [Feb 19, 2018](https://hashnode.com/posts/building-complex-android-animations-with-rxjava/63aa16c58de4e0eeae65147b) ### [IT Contracting in London: the good, the bad, the ugly](https://zenandroid.hashnode.dev/it-contracting-in-london-the-good-the-bad-the-ugly?utm_source=hashnode&utm_medium=feed) As I'm nearing the end of my fist contract I figured I'd write a short non-technical article about what I learned in those first 6 months as a contractor. This might be particularly interesting to developers that live in the UK (or plan to move there... 7 min read · [zenandroid.hashnode.dev](https://zenandroid.hashnode.dev/it-contracting-in-london-the-good-the-bad-the-ugly?utm_source=hashnode&utm_medium=feed) [Jan 14, 2018](https://hashnode.com/posts/it-contracting-in-london-the-good-the-bad-the-ugly/63aa16ce8de4e0eeae65147e)