This library offers:

alpha animation on touch,

setting clearance angle,

fitting text field position itself during an animation,

setting a description and showing it for every paragraph,

a click callback,

a click effect,

transformation between a pie chart and a ring chart,

animation when drawing the chart.

It has a really good documentation (also in English). There is also a sample app. All is released under Apache-2.0 license.

This library helps with adding a “Floating Window” which can be displayed on the top of your all Activities. The “Float Window” can be defined as eg. Floating Action button. This is shown below.

This library is released under Apache 2.0 license. It has a good documentation but it is written in Chinese. Just translate to English and have a fun!

The reason for that library was to facilitate work with canvas on Android. Instead of methods, you can use objects now.

By using this library, you can achieve e.g. a custom underline on a TextView which is shown above.

The example in README is self-explanatory and easy to use. The documentation is decent enough and the library is released under Apache-2.0 license. Have fun with drawing!

This is quite interesting library which displays ImageView in RecyclerView and it acts like a window. See the gifs below for the visualization.

This project includes a sample app. The documentation is fair enough for getting started and the library is released under MIT license.

ChartView is a project which presents, how to draw custom charts using Canvas and ValueAnimator .

This is an utility logger library, on top of standard Android Log class for storing logs in a database and push them to remote server for debugging.

The documentation is really comprehensive. There is also a blog post about it and a sample application. The library is released under MIT license and currently has version 0.0.7.

Fairy is an easy debug tool which allows developers to use adb logcat command to view Android system log on an Android phone instead of on a computer.

It also allows to scan the system log information anywhere using Android phone without even having a root.

The library has decent documentation and it is released under Apache-2.0 license. It supports Android API 21 and above.

This is another great library from Florent Champigny. It provides us with an implementation of Expansion Panels (which contain creation flows and allow lightweight editing of an element).

The documentation is really comprehensive and the project itself contains a sample app. All the code is under Apache-2.0 license. The sample app is also available on Google Play

This is

Set of Kotlin APIs to make graphics math easier to write. These APIs are mostly modeled after GLSL (OpenGL Shading Language) to make porting code to and from shaders easier. The various types offered by this library are only meant to be value types. Most APIs are therefore exposed as top-level functions and not as methods

The project is released under Apache-2.0 license.

This is a library which provides a Ticket View. It offers 3 types of TicketView corners: normal, rounded and scallop.

This project is released under Apache-2.0 license and the sample app can be found in the Github repo or on Google Play. The documentation is decent and the library supports API 15 and above.

This library provides a simple way to encrypt sensitive date into a native .so library.

How the library works? All the key-values are auto-packaged into a native library during a compile time. Then it can be obtained from the Java interface generated by Cipher.so.

The documentation is good enough and the project is released under Apache-2.0 license.

This is a fork of Buffer clean architecture boilerplate using the Model-View-Intent pattern.

In the presentation layer it uses now ViewModels from the Android Architecture Components Library. The caching layer now also uses Room.

This library is a lightweight, plug-and-play indefinite pager indicator for RecyclerViews & ViewPagers .

This library has really good documentation, sample app, a lot of dots customisation and is released under MIT license. MinSDK is 16.

If you use Dagger, you will probably find it interesting to see how your dependencies look on a graph. Daggerph is a tool which provides this functionality for you.

The documentation is quite short but enough to get started with the project, which is released under Apache-2.0 license.

This is an Android library to hook and fix Toast BadTokenException .

The purpose for this library was a fact, that from API 25, a new parameter was added IBinder windowToken for Toast#handleShow() and it brought the BadTokenException . This library tries to workaround that issue.

More info you can find in README on Github. The project is released under Apache-2.0 license.

This is not a library but a sample app which shows how to create a carousel using RecyclerView .

Unfortunately there is no English documentation, however you can refer to this article (tutorial) and translate it.

This library makes native Android Toasts Fancy. It takes the standard Android Toast to the next level with a variety of styling options. It offers also styling Toasts from the code.

This library has a good documentation and contains a sample app as well. MinSDK is set to 19 and this whole project is released under Apache-2.0 license.

This library is a fork from this RecyclerViewCardGallery. Instead of using ViewPager, an author used RecyclerView, to achieve carousel effect with swipe to refresh.

The project has basic documentation, sample app and it is released under Apache-2.0 license.

This library helps with loading modules (features) in Android apps on demand, whenever needed. Before this library can be used a module needs to be compiled to a separate jar/dex or apk file. Right now, the library supports java libraries and android libraries which don’t rely on android resources.

The author of the library also mentioned the benefits of Lazy loading of a feature vs having the feature in the main executable file:

feature is loaded in memory only when really needed. It offloads code from the main executable file which remains smaller which guarantees better cold start time. On Dalvik it offloads methods off the main dex file decreasing performance penalty of multi dex

feature code is clustered together in memory as it lives in one file and it provides most optimal execution in terms of memory access

less disk space is used if some features remain unused because code is not uncompressed

it may improve developer velocity where many developers concurrently work on the same codebase by providing very rigid isolation between features

module hotswapping may be implemented allowing for faster development without restarting the app

This is an experimental Retrofit 2 CallAdapter.Factory for Kotlin coroutine's Deferred . Released under Apache-2.0 license.

This library is another calendar and date picker. It can preset a selected date and is heavily customisable — you can customise almost all text sizes and colours, background colours and month title.

This library is released under MIT license and has basic documentation.

This is a command line tool (similar to svgo ) that optimizes Android VectorDrawable (VD) and AnimatedVectorDrawable (AVD) xml files.

It is created by Alex Lockwood and released under MIT license.

What it exactly does: