I recently destroyed my good old Nexus 6 phone. It’s still working, but display screen is broken. Due to this fact, I’ve had an excuse to buy new Pixel 2 phone. It’s pretty expansive, but its quality is really good. As usual, I wanted to debug an app on this device and encountered problem related to device permissions. Once I connected the phone, to my laptop and typed adb devices, I’ve seen the following message: ...

Introduction I have my own tiny Python project called spotify-cli-linux, which is (surprise!) command line interface for Spotify desktop app on Linux. Python is not my primary programming language and I work more with Java. Nevertheless, I find this language enjoyable and useful in many cases, so I try to learn something new about it from time to time. In the beginning, I’ve provided instructions how to install my Python script in the system via curl and wget, which is fine, but it’s not recommended and official way to do it. Moreover, people may be afraid of running shell scripts from remote resources on their machines. That’s why I decided to upload my project to PyPi, which is The Python Package Index. ...

Problem If you are working with Git Version Control System, probably you have seen a commit messages in your git log like: Merge branch 'master' to 'master' or something similar. You might have even pushed such commits! Don’t worry, so did I ;-). In this article I’m going to explain why is it happenning and how to avoid it. Such situation happens when you performed changes locally and at the same time someone else performed changes on the same branch as well, commited and pushed them to the remote repository. When you are done with your changes, you committed everything and want to push changes. If there are no conflicts, Git wants you to synchronize local repository with the remote repository. That’s why you need to merge changes from the remote master branch into your local master branch. After that you can finally push your changes. ...

Introduction In the cloud computing era, companies start using services like Google Cloud Platform, Amazon Web Services or Microsoft Azure. We can hear about the term “Serverless”. It doesn’t mean that we don’t have any servers. It means that third-party services provide us server infsrastrucutre, monitoring and scaling capabilities, so we don’t have to care about that stuff by ourselves and we can focus on writing code. We have concepts like Backend as a Service (BaaS) and Funtion as a Service (FaaS). In BaaS we can configure whole backend infrastructure using third-party cloud services. In this case, we can have database, REST API and other services, which we need depending on our use case. In FaaS, we have just a tiny piece of code responsible for a single job, which we can take and deploy into the cloud. AWS Lambda is an example of FaaS and we’ll focus on it in this article. ...

Today, I’ve released my another tiny project. It’s a very simple implementation of Event Bus with RxJava 2 under the hood. This library is compatible with Java 1.7 or higher. I didn’t use Java 1.8 or 1.9 because I wanted to make it compatible with Android apps. You can use it as follows: Bus bus = ReactiveBus.create(); Disposable observer = bus.receive().subscribe(new Consumer<Event>() { @Override public void accept(Event event) { // handle event here } }); Once, we created Event Bus object and our observer (or more precisely: disposable subscriber), we can start sending events: ...