Adding 'Android' specific code to Actor C++ Code

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1

I’ve added an extern to the LaunchAndroid.cpp code that compiles into the UE4 native library.

extern "C"
{
	bool isPressed(int playerNum, int keyCode)
	{
		//omitted for example sake
		return false;
	}
}

And then I’ve added C++ code to the Flappy Chicken project that I want to have call the extern in the UE4 native library.

// Fill out your copyright notice in the Description page of Project Settings.

#include "TappyChicken.h"
#include "OuyaSDK.h"

#if PLATFORM_ANDROID
extern "C" bool isPressed(int playerNum, int keyCode);
#endif


AOuyaSDK::AOuyaSDK(const class FPostConstructInitializeProperties& PCIP)
	: Super(PCIP)
{
}

bool AOuyaSDK::OuyaGetButton(int32 playerNum, int32 button)
{
#if PLATFORM_ANDROID
	return isPressed(playerNum, button);
#else
	return false;
#endif
}

I’m wondering what the best way is to write ‘Android’ platform code from your Actor C++ code.

Is the PLATFORM_ANDROID check going to compile in the code I’ve added when I publish to the Android platform?

Or is there an alternative way to communicate with native methods from Actor code?

2

That seems to be the right way to do it because it does detect if I purposely inject an error.

#if PLATFORM_ANDROID
fsdjfdsjkfdsjfdsjkfdsj
#endif

A quick way to check if the mistake is detected:

C:\unreal\UnrealEngine\Engine\Binaries\DotNET\UnrealBuildTool.exe TappyChicken Android Development  C:\ouya-sdk-examples\Unreal\TappyChicken\TappyChicken.uproject  -noxge
3

The code I posted in the question is correct. Verified it works. My only issue is the BluePrint needed to be wired up properly to actually invoke the event.

4

You can see a working example by looking at the details of this commit.

https://github.com/tgraupmann/UnrealEngine/commit/34e5b87a24beacc637bb0ddcd31740d6ae63aaef