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Basic Android Native Library Examples for Beginners (JNI via C++ Libraries)

• HelloWorld (JNI intro.)

  • This uses native-lib.cpp to get string from our C++ library and print that on screen using regular TextView.setText(String) function.

• Basic Calculator (Native Library)

  • This uses native library to do simple calculations and then display the result.
  • JNI functions take parameters in jstring (Java String) then converts it into C string (char*) and then into C integer (int) via std::atoi()
  • Flow : String -> Jstring -> Char* -> int -> std::string -> c_string() -> String

• Native Obfuscation (Sample C++ based Java Obfuscation)

  • This uses native library to Obfuscate the code.
  • JNI functions takes two parameters in jstring (Java String) and jint (Java Integer) and then performs XOR with (jint/10042069)
  • Uses Class.forName().getMethod() and Method.invoke() to obfuscate class names and basic method calls.