bytedeco/javacpp

How to handle AssetManager using JavaCpp?

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#792 opened on Jan 23, 2025

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Description

I have a c++ library that needs access to the java Android AssetManager. (android.content.res.AssetManager) To pass it to the library, I am using a custom JNI that takes this AssetManager as a jobect and then converts it to the equivalent c++ class AAssetManager (defines in android/asset_manager.h) using AAssetManager_fromJava(jobject*)

I was wondering how to handle this using javacpp?

I tried to do infoMap.put(new Info("AAssetManager").javaNames("AssetManager").define()) but the generated NativeLibrary.java doesn't define the AssetManager class.

Contributor guide

Tech stack
javacppandroid
Domain
mobile
Issue type
research
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
JavaCpp basicsAndroid NDKJNI knowledge
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
20
Research direction
Investigate how JavaCpp handles Android framework classes like AssetManager. The user attempted to use infoMap.put with Info("AAssetManager").javaNames("AssetManager").define() but it didn't generate the class. Look into JavaCpp's support for Android's asset manager.h, which is a C API. Consider whether a custom JNI wrapper is needed or if there is an existing mapping. Check JavaCpp documentation and examples for similar cases.