Android Curl Example

Minimal Android example for using libopenssl and libcurl with NDK and JNI.

Pay special attention to the directory app/src/main/cpp where most of the work resides.

Mechanism

• Use Android NDK to compile C functions together with cross-compiled libcurl and libopenssl libs.
• Use JNI to connect C functions to Java functions.
• Load NDK compiled shared lib in Android app.
• Call Java functions which call C functions eventually and can use all the stuff curl and openssl provide.

Compile openssl and curl for Android

See this repo: openssl-curl-android for how to cross-compile those two libs.

For simplicity, I just copied the whole build directory from openssl-curl-android to app/src/main/cpp/libs. You may find better ways to place pre-compiled libs or just build them on the fly.

Note

I have removed actual built libs from Git. Remember to copy precompiled ones to app/src/main/cpp/libs to make the app build.