Android Java Libraries in UE4 Game (OUYA SDK, Google Play Game Services, etc.)

tgraupmann · April 24, 2016, 5:31pm

I’ve also submitted a PR for adding an Android input callback.
https://github.com/EpicGames/UnrealEngine/pull/2314

Here’s the C++ plugin project:

tgraupmann/UnrealEngine_AndroidInputRemap/blob/master/AndroidPluginTest/AndroidPluginTest.uproject

{
	"FileVersion": 3,
	"EngineAssociation": "{147823AE-4A48-148A-28A9-8885FDF888E1}",
	"Category": "",
	"Description": "",
	"Modules": [
		{
			"Name": "AndroidPluginTest",
			"Type": "Runtime",
			"LoadingPhase": "Default"
		}
	]
}

Header:

github.com

tgraupmann/UnrealEngine_AndroidInputRemap/blob/master/AndroidPluginTest/Source/AndroidPluginTest/AndroidPluginTest.h

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

#pragma once

#include "Engine.h"

/**
 * This is a unit test to verify that the Android input callback is properly
 * invoked on Android.
 * A successful test will display a message in the Android logcat.
 */
#if PLATFORM_ANDROID

/*
 * In this case `Unit Test` is meant as a
 * test created by the developer to make sure
 * a particular feature works.
 * This test uses the class constructor
 * to register the callback by
 * constructing a global variable

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Implementation:

github.com

tgraupmann/UnrealEngine_AndroidInputRemap/blob/master/AndroidPluginTest/Source/AndroidPluginTest/AndroidPluginTest.cpp

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

#include "AndroidPluginTest.h"

// this test is Android specific
#if PLATFORM_ANDROID

// Get access to Android logging
#include <android/log.h>

// The Android Input callback is defined in the launcher code
#include "../../../Launch/Public/Android/LaunchAndroid.h"

// Redefine a tag for logging
#ifdef LOG_TAG
#undef LOG_TAG
#endif
#define LOG_TAG "AndroidPluginTest"

#endif

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This relates to JAR handling because I add special controller remapping in the JAR and use this callback to pass Android input to a JAR, which gets remapped and then passed back to the UE4 plugin.

The result is that I can add support to the framework for new controllers and mappings without needing to rebuild/republish the UE4 games and apps.