What is minimally required to generate an .apk?

[Phil Dougherty]

My situation is that I'm attempting to build a vulkan + openxr app for the Oculus Quest.

I've thus far successfully generated my libmyapp.so making use of android_native_app_glue (along with vulkan and oculus' version of openxr).

I have an AndroidManifest.xml which uses <application ... android:hasCode="false">, and the <activity> tag contains <meta-data android:name="android.app.lib_name" android:value="myapp"/> (along with the other recommendations here: https://developer.android.com/ndk/samples/sample_na , and here https://developer.oculus.com/downloads/package/oculus-openxr-mobile-sdk/  ).

I have a build.gradle file which looks like the following:

android {

  compileSdkVersion 30

  buildToolsVersion "30.0.0"

  project.archivesBaseName = "myapp"

  ndkVersion "21.3.6528147"

  defaultConfig {

    applicationId "com.dophil.myapp"

    minSdkVersion 26

    targetSdkVersion 26

    compileSdkVersion 26

    versionCode 1

    versionName "0.1"

  }

  sourceSets {

    main {

      manifest.srcFile 'AndroidManifest.xml'

    }

  }

}

and can run `gradle build` with success (it even generates an .apk).

However- I'm quite sure that I'm missing at LEAST one step (and likely many), because I haven't made explicit where libmyapp.so exists such that it could package it in the .apk (let alone the other resources libmyapp.so expects to be able to find).

what are my next steps in packaging that library, and other resources it needs, together into a coherent .apk? (If this is too large a question, I would also appreciate being directed to some resource which I could use to help myself!) I would prefer if possible to NOT rely on using android studio to create a new project and porting my existing project structure to that (I already have compiled my NDK-using C++ codebase!).

[Dan Albert]

Preferably you'd use Gradle to build your C++ code (via CMake or ndk-build, using externalNativeBuild), and then you don't have to do anything else.

If for some reason that's a bad fit for your project (it almost never is for anything but third-party code), you can include your libraries as a prebuilt in your project by putting them in the right directory.

Either way, https://developer.android.com/studio/projects/gradle-external-native-builds is the doc you want.

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[Phil Dougherty]

ah- brilliant! yes that is _exactly_ the doc I was looking for, but my apparently lackluster google fu convinced me didn't exist. thank you!