JLoop - A Java Looper

A simple Java Looper implementation / example. Only depends on SLF4J for a logging facade.

Usage

Build from source

#> mvn verify

Include in build

Quickest way is by using JitPack (Also see for instructions on gradle usage)

Add JitPack repository

<repositories>
    <repository>
        <id>jitpack.io</id>
        <url>https://jitpack.io</url>
    </repository>
</repositories>

Add dependency

<dependency>
    <groupId>com.github.ivovandongen</groupId>
    <artifactId>jloop</artifactId>
    <version>master</version>
</dependency>

Main Looper

A main looper can be created once and can be accessed statically from any other thread for usage after. For a more complete reference see the Unit Test

On the main thread:

Looper looper = Looper.prepareMainLooper();
looper.run() // Will block indefinitely

On any other thread:

Looper.prepareMainLooper().post(() -> {
    // Do what must be done on the main thread 
});

Other methods available are Looper#postDelayed and Looper#ask()

"Regular" Looper

For other use cases, a regular looper can be prepared on a Thread. Reference to this looper must be handed to other threads manually:

Looper looper = Looper.prepare();
looper.run() // Will block indefinitely

LooperThread

A LooperThread is a convenient way to create a Looper on a new, separate Thread. See the Unit Tests for more details.

LooperThread lp = new LooperThread();
lp.start(); // Will block until backing Looper is ready