The altcoinj library (forked from libdohj) is a lightweight Java library around bitcoinj, with updated support for Litecoin and Dogecoin.
Pull requests for support for other altcoins would be welcomed.
You should be familiar with bitcoinj first, as this library simply adds minor changes to extend bitcoinj. Generally using altcoinj is equivalent to using bitcoinj, except with different network parameters (reflecting altcoin consensus in place of Bitcoin).
Be aware however that altcoin blocks have their own class, AltcoinBlock, which adds support for features such as AuxPoW.
To use altcoinj in your own project, just add the following to your gradle.build file:
repositories {
maven { url 'https://jitpack.io' }
}
dependencies {
compile 'com.github.jjos2372:altcoinj:f26e20bb13'
compile 'org.bitcoinj:bitcoinj-core:0.15.6'
}
For maven, sbt, and leiningen check jitpack.
Simply run on the command line
./gradlew jar
The outputs are under the build directory.
Alternatively, just import the project on your preferred IDE as a gradle project.