v8.4.2 (Oct 6, 2020)
Apr 22, 2014
Oct 6, 2020
Mike Penz (mikepenz)
Thiago Rocha (thiagokimo)
Mike Penz (mikepenz)
Tobias Preuss (johnjohndoe)
Thomas Hunsaker (thunsaker)
Niek Haarman (nhaarman)
Bernat Borrás Paronella (alorma)
Kevin Schultz (krschultz)
Frieder Bluemle (friederbluemle)
Pedro Veloso (pedronveloso)
Peter Siegmund (mars3142)
Diogo Bernardino (diogobernardino)
Csaba Kozák (WonderCsabo)
Dave (MDXDave)
Karol Wrótniak (koral--)
The Gitter Badger (gitter-badger)
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Using Maven

The AboutLibraries Library is pushed to Maven Central.

CORE module

implementation "com.mikepenz:aboutlibraries-core:${latestAboutLibsRelease}"

UI module

implementation "com.mikepenz:aboutlibraries:${latestAboutLibsRelease}"

//required support lib modules
implementation "androidx.appcompat:appcompat:${versions.appcompat | 1.x.y}"
implementation "androidx.cardview:cardview:${versions.cardview | 1.x.y}"
implementation "androidx.recyclerview:recyclerview:${versions.recyclerview | 1.1.y}"
implementation "com.google.android.material:material:${versions.material | 1.1.y}"

Basic Usage

You can use this library in a few different ways. Create your own activity, including a custom style or just use its generated information. Or simply use the built-in Activity or Fragment and just pass the libs you would love to include.

Activity / Fragment

NOTE: These integrations require the ui-module


    .start(this) // start the activity

The activity uses a toolbar, which requires the appropriate theme. See Style the AboutLibraries for more details


val fragment = LibsBuilder()
    .withFields(R.string::class.java.fields) // in some cases it may be needed to provide the R class, if it can not be automatically resolved
    .withLibraryModification("aboutlibraries", Libs.LibraryFields.LIBRARY_NAME, "_AboutLibraries") // optionally apply modifications for library information

Gradle API

The gradle plugin will automatically run when building the application, so no action is required to build the library information showed / retrieved via the Libs class. But there are additional commands which may be helpful for various situations.

Export Library information

./gradlew exportLibraries // exists also per variant

Exports all libraries in a CSV format with the name, artifactId, and licenseId. And a seperate list with all licenses used, and a potential list of unmatched libraries / licenses.


./gradlew findLibraries

Finds all included libraries with their name, and the unique AboutLibraries identifier which can be used to modify libraries and their information, or create custom mapping information if required. See the Config section for more information.

Advanced Usage

Access generated library details

If you want to create your own integration you can access the generated library information programmatically through the code module.

val libraries = Libs(this).libraries
for (lib in libraries) {
    Log.e("AboutLibraries", "${lib.libraryName} from ${lib.author}")

About this App UI

You can also use the AboutLibraries activity as an "about this app" screen. Add the following .xml file (or just the strings - the key must be the same) to your project.

    <string name="aboutLibraries_description_showIcon">true</string>
    <string name="aboutLibraries_description_showVersion">true</string>
    <string name="aboutLibraries_description_text">Place your description here :D</string>

or use the builder and add following:

 .withAboutDescription("This is a small sample which can be set in the about my app description file.<br /><b>You can style this with html markup :D</b>")

Style the AboutLibraries 🖌️

Create your custom style. If you don't need a custom theme see the next section, how you can set the colors just by overwriting the original colors.

// define a custom style
<style name="CustomAboutLibrariesStyle" parent="">
    <!-- AboutLibraries specific values -->
    <item name="aboutLibrariesCardBackground">?cardBackgroundColor</item>
    <item name="aboutLibrariesDescriptionTitle">?android:textColorPrimary</item>
    <item name="aboutLibrariesDescriptionText">?android:textColorSecondary</item>
    <item name="aboutLibrariesDescriptionDivider">@color/opensource_divider</item>
    <item name="aboutLibrariesOpenSourceTitle">?android:textColorPrimary</item>
    <item name="aboutLibrariesOpenSourceText">?android:textColorSecondary</item>
    <item name="aboutLibrariesSpecialButtonText">?android:textColorPrimary</item>
    <item name="aboutLibrariesOpenSourceDivider">@color/opensource_divider</item>

// define the custom styles for the theme
<style name="SampleApp" parent="Theme.MaterialComponents.Light.NoActionBar">
    <item name="aboutLibrariesStyle">@style/CustomAboutLibrariesStyle</item>

Gradle Plugin Configuration

It is possible to provide custom configurations / adjustments to the automatic detection. This can be done via the gradle plugin.

aboutLibraries {
    configPath = "config" // the path to the directory containing configuration files

This directory may contain one or more of the following configurations:

custom_enchant_mapping.prop // allows providing custom mapping files to overwrite the information from the POM file
custom_license_mappings.prop // allows defining the licenseId which should be used for the library (if not resolvable via the POM file)
custom_license_year_mappings.prop // allows defining the license Year for this library (this information CANNOT be resolved from the POM file)
custom_name_mappings.prop // allows overwriting the name of a library if the POM specifies unexpected information
custom_author_mappings.prop // allows overwriting the authors of a library if the POM specifies unexpected information
custom_exclusion_list.prop // allows excluding libraries by their id at build time

See the corresponding files here for the format and content: https://github.com/mikepenz/AboutLibraries/tree/develop/library-definitions/src/main/res/raw

Custom Licenses

It is possible to add additional licenses. In order to do so, you have to add the content of the license as an own text file in the app's raw folder e.g. app/src/main/res/raw/myLicense.txt This file will contain the full raw license text which may be too long for the strings.xml file.


<p>Version 2, June 1991</p>

Copyright &copy; 1989, 1991 Free Software Foundation, Inc.<br/>
51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA<br/><br/>

Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.

Next, you need to add string identifiers that allow the plugin to recognize the license.

<!-- identifier used to reference this license -->
<string name="define_license_myLicense" translatable="false" />
<string name="license_myLicense_licenseName" translatable="false">Custom License</string>
<string name="license_myLicense_licenseWebsite" translatable="false">https://www.gnu.org/licenses/gpl-2.0.html</string>
<string name="license_myLicense_licenseShortDescription" translatable="false">
        <p>&lt;one line to give the program\'s name and a brief idea of what it does.&gt;
        Copyright &copy; &lt;year&gt;  &lt;name of author&gt;</p>
        <p>This program is free software; you can redistribute it and/or
        modify it under the terms of the GNU General Public License
        as published by the Free Software Foundation; either version 2
        of the License, or (at your option) any later version.</p>
        <p>This program is distributed in the hope that it will be useful,
        but WITHOUT ANY WARRANTY; without even the implied warranty of
        GNU General Public License for more details.</p>
        <p>You should have received a copy of the GNU General Public License
        along with this program; if not, write to the Free Software
        Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.</p>
<!-- name of the license file under the raw folder -->
<string name="license_myLicense_licenseDescription" translatable="false">raw:myLicense</string>

Finally, you have to use the specified identifier myLicense when referencing this license in your mappings.

Custom Libraries

In case the plugin fails to detect a library or you're using an embedded library, you can manually add an entry that will be picked up by the plugin. All you have to do is define custom string identifiers for the library.

    <!-- identifier used to reference this library -->
    <string name="define_plu_myLibrary">year;owner</string>
    <string name="library_myLibrary_author">Author</string>
    <string name="library_myLibrary_authorWebsite">https://mikepenz.dev<string>
    <string name="library_myLibrary_libraryName">My Library</string>
    <string name="library_myLibrary_libraryDescription">Some text</string>
    <string name="library_myLibrary_libraryVersion">10.1.1</string>
    <string name="library_myLibrary_libraryWebsite">https://mikepenz.dev</string>
    <!-- you can also reference custom licenses here e.g. myLicense -->
    <string name="library_myLibrary_licenseIds">apache_2_0</string>
    <string name="library_myLibrary_isOpenSource">true</string>
    <string name="library_myLibrary_repositoryLink">https://mikepenz.dev</string>
    <!-- Custom variables section -->
    <string name="library_myLibrary_owner">Owner</string>
    <string name="library_myLibrary_year">2020</string>

Usage WITHOUT gradle plugin (not recommended)

If you do not want to use the gradle plugin, you need to add the legacy definition files, which will then be included in the built apk, and resolved via reflection during runtime.

NOTE: This is not recommended. Please migrate to use the gradle plugin

implementation "com.mikepenz:aboutlibraries-definitions:${latestAboutLibsRelease}"


Exclude R from ProGuard to enable the libraries auto detection

-keep class .R
-keep class **.R$* {

In case you want to minimize your resources as much as possible use the following rules (Thanks to @rubengees and @AllanWang as discussed here: https://github.com/mikepenz/AboutLibraries/issues/331)

-keepclasseswithmembers class **.R$* {
    public static final int define_*;

These rules will require you to add the libraries manually. (see more in the above linked issue)


This library uses all compile time dependencies (and their sub dependencies) as defined in your build.gradle file, this could lead to dependencies which are only used during compilation (and not actually distributed in your app) to be listed or missing in the attribution screen. It might also fail to identify licenses if the dependencies do not define it properly in their pom.xml file.

Careful optimisation and review of all licenses is recommended to really include all required dependencies. The use of the gradle commands like findLibraries can help doing this.

It is also important that native sub dependencies can not be resolved automatically as they are not included via gradle. Additional dependencies can be provided via this plugins API to extend and provide any additional details.

Used by

(feel free to send me new projects)

Developed By


Copyright 2020 Mike Penz

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at


Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
See the License for the specific language governing permissions and
limitations under the License.