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blankj/androidutilcode

★ 33,676JavaAudience · developerComplexity · 2/5StaleLicenseSetup · easy

TLDR

A Java library of ready-made utility functions for Android apps, date formatting, encryption, file handling, networking, and hundreds of other common tasks.

Mindmap

mindmap
  root((repo))
    What it does
      Utility functions
      Common Android tasks
      Drop-in library
    Key features
      Two modules
      Demo code
      Unit tests
    Use cases
      Speed up development
      Avoid code duplication
      Handle repetitive work
    Tech stack
      Java
      Android SDK
    Utilities covered
      Date formatting
      Encryption
      File system
      Networking

Things people build with this

USE CASE 1

Speed up Android app development by reusing tested utility functions instead of writing them from scratch.

USE CASE 2

Handle common tasks like date formatting, string encoding, encryption, and file operations with a single library.

USE CASE 3

Check network connectivity, manage status bars, and perform other system-level operations without boilerplate code.

USE CASE 4

Support older Android devices by using utilities compatible with API level 14 and above.

Tech stack

JavaAndroid SDK

Getting it running

Difficulty · easy Time to first run · 5min
Use freely for any purpose including commercial. Keep the notice and disclose changes to the patent grant.

In plain English

AndroidUtilCode is a collection of utility functions for Android app development, packaged as a Java library that developers can drop into their projects. Android development involves a lot of repetitive tasks, formatting dates, encoding strings, encrypting data, managing the status bar, working with the file system, checking network connectivity, and hundreds of similar operations that appear in nearly every app. Rather than rewriting these from scratch in each project, this library provides ready-made, tested implementations of all of them. The library is split into two modules. The main module called "utilcode" contains the most commonly used utilities for everyday Android development. A secondary module called "subutil" contains more specialized helpers that are used less frequently but can simplify certain tasks. Every utility comes with a demo and unit tests, making it straightforward to verify behavior and understand how to use each function. Someone would use this library when building an Android application in Java or working with the Android SDK, wanting to avoid reinventing common functionality. It supports Android API level 14 and above, which covers a very wide range of Android devices. The README is fairly sparse and points to separate documentation files for the full list of utilities covered. The tech stack is Java for Android, distributed as an Android library. The README does not describe further technical architecture details.

Copy-paste prompts

Prompt 1
Show me how to use AndroidUtilCode to format dates and encrypt strings in my Android app.
Prompt 2
I need to add file system operations and network connectivity checks to my Android project, how do I use this library?
Prompt 3
Walk me through integrating AndroidUtilCode into my Android project and using the most common utilities.
Prompt 4
What utilities does AndroidUtilCode provide for managing the status bar and handling encryption in Android?
Prompt 5
Help me understand the difference between the utilcode and subutil modules and when to use each one.
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Generated 2026-05-18 · Model: sonnet-4-6 · Verify against the repo before relying on details.