- ZXing ('Zebra Crossing') (Utility)
requires 3 permissions: android.permission.WAKE_LOCK, android.permission.VIBRATE, android.permission.CAMERA 
ZXing („zebra crossing“) is an open-source, multi-format 1D/2D barcode image processing library.
- Apache Common (Development Framework)
an Apache project focused on all aspects of reusable Java components.
- Android Support v4 (Development Framework)
The Android Support Library is not actually a single library, but rather a collection of libraries that can roughly be divided into two groups: compatibility and component libraries. For details, please see
Understanding the Android Support Library.
- Arch (Utility)
helper for other arch dependencies, including JUnit test rules that can be used with LiveData.
- AppCompat (Utility)
support newer Android features on older Android versions.
- Constraint Layout Library (Utility)
library to reduce the number of nested views needed.
- Androidx Core (Utility)
a static library that you can add to your Android application in order to use APIs that are either not available for older platform versions or utility APIs that aren't a part of the framework APIs.
- Documentfile (UI Component)
a library to view a file document.
- Exifinterface (Utility)
a library to read and write image file EXIF tags.
- androidx.legacy (Utility)
a static library that you can add to your Android application in order to use APIs that are either not available for older platform versions or utility APIs that aren't a part of the framework APIs.
- Lifecycle (Utility)
perform actions in response to a change in the lifecycle status of another component, such as activities and fragments.
- Loader (Utility)
library to load data for your UI that survives configuration changes.
- Media (Utility)
share media contents and controls with other apps.
- Preference (Utility)
a library to build interactive settings screens without needing to interact with device storage or manage the UI.
- Print (Utility)
a library to print photos, docs, and other graphics and images.
- Transition (UI Component)
animates motion in the UI with starting and ending layouts.
- Vectordrawable (UI Component)
AndroidX library to render vector graphics.
- Material Dialogs (UI Component)
library to help building dialogs that meet the Material Design standards, including e.g. progress display, multiple-choice selections with check-boxes, password (and other) text input.
- Glide (Utility)
An image loading and caching library for Android focused on smooth scrolling
- ExpansionPanel (UI Component)
creation flows and allow lightweight editing of an element.
- Http Request (Utility)
Java HTTP Request Library.
- Google Material Design (Utility)
library to help with material design guidelines.
- ZXing Android Embedded (Utility)
Barcode scanning library for Android, using ZXing for decoding.
- OkHttp (Utility)
OkHttp is an HTTP+HTTP/2 client for Android and Java applications.
- MaterialProgressBar (UI Component)
Material Design ProgressBar with consistent appearance.
- Zip4j (Utility)
Java open-source library to handle Zip files.
- OkHttp okio Framework (Utility)
A modern I/O API for Java to make it much easier to access, store, and process your data.
- MarkdownJ (Utility)
pure Java port of John Gruber's text-to-html conversion tool
Markdown.
- NanoHTTPD (Utility)
Tiny, easily embeddable HTTP server in Java.
- (Utility)
a simple generic text editor.
- Genonbeta Android Framework (Development Framework)
provides a bunch of helpful abstraction layers for your Android application where Google's Android Support Library falls behind.
Das Inoffizielle Android-Handbuch
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