After a couple years of publishing posts here I have decided to move on to the more flexible blogging platform. frogermcs.github.io was originally created as a content-first project. The idea behind it was to setup website as fast as possible,...

Every big tech company today is data-driven. Products are more often built based on collected data rather than internal opinions. It’s very likely that in this moment some of apps on your device are serving you A/B test variants, checking...

Github Actions — building first agent for Google Assistant in Java

Some time ago I published unofficial Google Actions SDK written in Java. Source code and documentation can be found on Github: Google-Actions-Java-SDK. Library can be also downloaded from Bintray...

Voice interfaces are definitely the future of interaction between people and the technology. Even if they won’t replace mobile apps (at least in next years), for sure they extend their possibilities. It means that for many mobile programmers, assistants like...

A couple months ago, when Android Nougat was announced, among new features like Multi-window, enhanced notifications, VR support, 72 new emojis 👍 and others, there was a new addition to monitoring tools: Frame Metrics API.

On older Android versions...

A couple months ago, during MCE³ conference, Gregory Kick in his presentation showed a new concept of providing Subcomponents (e.g. to Activities). New approach should give us a way to create ActivitySubcomponent without having AppComponent object reference (which...

Custom scopes in Dagger 2 can give better control on dependencies which should live unusual amount of time (different than application and screen lifetime). But to implement it properly in Android app we need to keep in mind a couple...

The main purpose of Dependency Injection pattern which is implemented by Dagger 2 is that DI separates the creation of a client’s dependencies from the client’s behavior. In practice it means that all calls of new operator, newInstance()...

A couple weeks ago I wrote a post about asynchronous dependency injection in Dagger 2 with Producers. Objects initialization execution on background thread(s) has one great advantage - it doesn’t block main thread which is responsible for drawing UI...

AndroidDevMetrics is a performance metrics library which will help you find potential performance issues in your Android app. Thanks to it we are able to measure objects graph initialization in Dagger 2, Activities lifecycle methods timings and frame drops...

This post is a part of series of posts showing Dependency Injection with Dagger 2 framework in Android. Today we’re going to take a look at Dagger Producers - an extension to Dagger 2 that implements asynchronous dependency injection in...

Dagger2Metrics was a good start to help us look for performance issues in Android apps which we develop. It shows us how much time is needed to initialize particular objects (and their dependencies) in graph, in Dagger 2. But...

A couple months ago we went through possible issues with Dagger 2 - graph creation performance. Thanks to TraceView tool we can see exactly how much time is needed to initialize all requested dependencies. But it’s not easy...

RecyclerView Animations and Behind the Scenes - One more time we’re going back to this presentation. It’s a fact that list views (or more generic - collection views) are the most common used view patterns in apps, across all...

Some time ago Twitter presented Hearts - replacement for star icons, with modern delightful animation of their state change.

You can say a lot with a heart. Introducing a new way to show how you feel...

We live in times where apps have to be not only useful but also smooth and delightful. Times slightly different than a couple years ago where all we had to do was just notifyDataSetChanged() on ListView adapter. Screen just...

After my last post about parsing JSON in Android with FlatBuffers parser (implemented in C++, connected via NDK to our project) great discussions started about the real performance of FlatBuffers and comparising them to another serialization solutions. You can...

FlatBuffers library is getting more and more popular recently. If you check last Android Performance Patterns series, Colt McAnlis mentions about it a couple times in different videos. Probably you remember Facebook’s announcement about migration to FlatBuffers....

#PerfMatters - recently very popular hashtag, especially in the Android world. The times when the apps just did something, no matter how, are already gone. Now everything should be pleasant, smooth and fast. For example Instagram spent almost...

JSON - probably everyone knows this lightweight data format used in almost all modern servers. It weights less, is more human-readable and in general is more dev-friendly than old-fashined, horrible xml. JSON is language-independend data format but parsing data and...

A couple months ago I started InstaMaterial series. The goal was simple - to prove that it is pretty straightforward to implement all those fancy animations and UI effects showed in Material Design guidelines. Now it becomes even easier...

This post is a part of series of posts showing Dependency Injection with Dagger 2 framework in Android. Today I’m going to spend some time with custom scopes - functionality which can be a bit problematic for Dependency Injection beginners.

This post is a part of series of posts showing Dependency Injection in Android with Dagger 2. Today I’d like to delve into a fundamentals of Dagger 2 and go through a whole API of this Dependency Injection framework.

Some time ago, at Google I/O 2015 Extended in Tech Space in Cracow I had a presentation about dependency injection with Dagger 2. In a time of preparation I realized that there is a lot of things to...

Dependency injection frameworks in Android - is there anyone who has never heard about it? At almost every Android dev conference someone talks about this software design pattern. I am a big fan of DI but there are also people...

This is just a summary of series of posts showing Android implementation of INSTAGRAM with Material Design concept. If you read previous posts about InstaMaterial project, you can skip this one.

A couple months ago I started to work on...

This post is the last part of a series of posts showing Android implementation of INSTAGRAM with Material Design concept. Today we’ll finally finish our project by creating the last elements - PublishActivity and SendingProgressView. This functionality...

This post is a part of a series of posts showing Android implementation of INSTAGRAM with Material Design concept. Today we’ll create flow for photo capturing. This functionality is presented between the 38th and 41st second of the concept...

This post is a part of a series of posts showing Android implementation of INSTAGRAM with Material Design concept. Today we’ll create Navigation Drawer - left sliding panel which shows global application menu. This element is presented between the...

This post is a part of a series of posts showing Android implementation of INSTAGRAM with Material Design concept. Today we’ll create user profile presented between the 29th and 33rd second of the concept video.

This...

This post is part of a series of posts showing Android implementation of INSTAGRAM with Material Design concept. Today we’ll create like effects in feed items which are presented between the 20th and 27th second of the concept video.

This post is part of a series of posts showing Android implementation of INSTAGRAM with Material Design concept. Today we’ll create context menu for feed items opened from “more” button. This element is presented on 18 to 20 seconds...

This post is part of a series of posts showing Android implementation of INSTAGRAM with Material Design concept. Today we’ll take care about some details which we skipped previously. It means that we are still on 9 to 13...

This post is part of a series of posts showing Android implementation of INSTAGRAM with Material Design concept. Today we’ll implement transition between feed and comments Activities (showed between 9 and 13 second in concept video). We’ll skip buttons...

A couple months ago, after Google presented Material Design - new design guidelines for mobile and web both, designer Emmanuel Pacamalan created concept video showing what Instagram for Android would look like after aplying Material Design rules:

Almost every Android developer knows sad true - Dalvik, Android’s virtual machine used by applications and some system services has one major limit - single .dex file (bytecode interpreted by Dalvik VM) can have only 64k (exactly 65536) methods.

What...