How to use Android libraries e.g. androidx.documentfile or com.android.support:support-v4 or com.android.support:support-v4?

[ctoabidmaqbool]

I am creating custom Attach plugin, but I am not sure how to use Android native libraris while developming the plugins native coding e.g. DalvikPdfViewerService.java.

I am trying to create custom Attach plugin e.g. pdfViewer.

I have added the lib depedency in modules/pdfviewer/build.gradle e.g.

implementation 'com.android.support:support-v4:28.0.0'

but still i can't use imports form this library e.g. import android.support.v4.provider.DocumentFile;

show how can i use native libs e.g. containing .aar files.

in previous javafxmobile-plugin i can simply use

project.afterEvaluate {
    explodeAarDependencies(project.configurations.androidCompile)
    explodeAarDependencies(project.configurations.compile)
}

now how can i use while creating attach plugin or in project which is using attach plugins.

[ctoabidmaqbool]

I think, only way to copy and past lib's codding directly, which is still not better way to doing things.
like xzing lib is directly copy & past without importing xzing lib.

https://github.com/gluonhq/attach/tree/master/modules/barcode-scan/src/main/native/android/dalvik/zxing