Compiling an Android project that depends on OpenSSL using Prefabs.txt

Compiling an Android project that depends on OpenSSL using Prefabs

Prefabs are a new feature of the Android Gradle Plugin 4.0.
Here is an outdated but still informative blog post about the subject:
https://android-developers.googleblog.com/2020/02/native-dependencies-in-android-studio-40.html

In the app build.gradle you simply add:

dependencies {
    implementation 'com.android.ndk.thirdparty:openssl:1.1.1g-alpha-1'
}

Here is a list of available packages:

https://maven.google.com/web/index.html?q=com.android.ndk.thirdparty#com.android.ndk.thirdparty:openssl

Currently available packages are: curl, jsoncpp and openssl.


In the android section in the app build.gradle you also add:

buildFeatures {
    prefab true
}


And in the defaultConfig section in the android section in the app build.gradle you also add:

externalNativeBuild {
          cmake {
              arguments "-DANDROID_STL=c++_shared"
          }
}

Otherwise you get this error message: 
> User is using a static STL but library requires a shared STL


In the CMakeList.txt you add:

find_package(openssl REQUIRED CONFIG)


And to target_link_libraries you add:

        openssl::crypto
        openssl::ssl

Thank you! 👏

I'm trying to include

#include <openssl/sha.h>

and I added the OpenSSL library as you mentioned, unfortunately my app is crashing:

    java.lang.UnsatisfiedLinkError: dlopen failed: library "libcrypto.so" not found: needed by /data/app/~~2-M8lYDV9CwRUTUVJ-xI7Q==/com.MYAPPNKq4Bj7P2ot9_6vUGCPvhQ==/lib/x86/libMYLIB.so in namespace classloader-namespace

do you know why that is happening and what I'm doing wrong? alternatively, is there a way to link the lib statically, so libcrypto.a instead of libcrypto.so? Looks like someone on stackoverflow says that the library is compiled incorrectly, but that's not using a prefab...

Take a look at this example: that one might be more up to date: https://github.com/android/ndk-samples/tree/master/prefab/curl-ssl