Welcome to the forum, @ygsaber!
What you want to do is not a project for a beginning programmer alone—even with occasional help and advice from developers here on the forum. You will need a dedicated, experienced mentor who can invest substantial time, guiding you and helping you overcome obstacles.
The reason I say this is because the
ij.plugins.filter.ParticleAnalyzer class has many lower level class dependencies. You would need to extract/rework a substantial portion of ImageJ1 to be Android-based. And ImageJ 1.x is fundamentally built on Java AWT, which is not part of Android's version of Java, so adapting it to Android would be an uphill battle. If all you need is relatively simple/basic particle detection, it would be much easier to write something from scratch.
In the future, I hope motivated and experienced Android developer(s) can look into adapting ImageJ2 to the Android API. We tried to build ImageJ2 such that this work will be possible—it likely has a good enough separation of concerns. However, Android was not an initial use case for either ImageJ1 or ImageJ2, and I'm sure there are many obstacles which would need to be overcome.