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

tgraupmann · April 26, 2016, 7:19pm

I merged both PRs into a new branch while I wait for approval.
The new branch - https://github.com/tgraupmann/UnrealEngine/tree/4.11-Cortex

Now I’ll focus on rewriting the OUYA/Cortex plugin as a UE4 plugin instead of embedding the plugin into the UE4 engine source.
The old way - https://github.com/tgraupmann/UnrealEngine/tree/4.10-Cortex

I’ve created an Example Project that uses a UE4 plugin to load JAR/Java classes.

The example project referenced my plugin “OuyaSDKPlugin” in the build script.

github.com

tgraupmann/UE4_Plugin_Cortex_App_Store/blob/master/ExampleProject/Source/ExampleProject/ExampleProject.Build.cs

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

using UnrealBuildTool;

public class ExampleProject : ModuleRules
{
	public ExampleProject(TargetInfo Target)
	{
        PublicDependencyModuleNames.AddRange(new string[] { "Core", "CoreUObject", "Engine", "InputCore", "OuyaSDKPlugin" });

		PrivateDependencyModuleNames.AddRange(new string[] {  });

		// Uncomment if you are using Slate UI
		// PrivateDependencyModuleNames.AddRange(new string[] { "Slate", "SlateCore" });
		
		// Uncomment if you are using online features
		// PrivateDependencyModuleNames.Add("OnlineSubsystem");
		// if ((Target.Platform == UnrealTargetPlatform.Win32) || (Target.Platform == UnrealTargetPlatform.Win64))
		// {
		//		if (UEBuildConfiguration.bCompileSteamOSS == true)

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I’ve created my UE4 plugin here:

I placed the JAR for the plugin here:

github.com

tgraupmann/UE4_Plugin_Cortex_App_Store/blob/master/ExampleProject/Plugins/OuyaSDKPlugin/Build/Android/libs/ouya-sdk.jar

PK
SwH	META-INF/PK
SwH²îMETA-INF/MANIFEST.MFóMÌËLK-.Ñ
K-*ÎÌÏ³R0Ô3àåâåPK
SwHtv/PK
SwHtv/ouya/PK
SwHtv/ouya/console/PK
SwHtv/ouya/console/a/PK
SwHäè½.Åtv/ouya/console/a/a.classmKK1OÚÚ´ãØÖ>´u!³_à ;«"º*U-W1i"3¢?Ë¢¨KÁ%¦uá«YÜp_.çÞ¼<¾ØB#¢F1G1OQ·BÎByLÛ¨b º7AkG*íøÜIÔVZ}6dnÈdÏõt$dogµC°<Áÿáû}è1¹=¼þ§²»B
½GßzñÆ È¨KNPl	ÉÛÉÀçÑ)óCãXJ¢ Ì^©hÀ4Áâwï¶ëD	©ytxðk-$(ýÍóËúÊCPÑCW%·Ì
UÈ]æ2lb
i
lsjEëo¨?!Õ-Ì3ÒÝô÷zìëÝøÍ¬©q3ó'4pnÜ²Ñ)?PK
SwHtv/ouya/console/api/PK
SwHf^ÚB)<tv/ouya/console/api/CancelIgnoringJsonResponseListener.classRMKÃ@mÓ¦ÕúÕL=¸Ð[r°X¨¼o%l³%üYþ8tawÞy3;ËìûÇë¡ïÂ¨Ó4Ô½Á7b%x&0åa+LGÀ$×*áÚð«L¬¶ï}ÞÍ2.*Ó¢
\£Ëß?(V\OÇÎ$KÅoÆ{iä2D©?¢cªðNÆ2¥¨mcrÎí}N$^ PÞsGb§ªEQæ;¡.óXN
´4®«FãT¨¬ÒË8Æ0¸ØÔøß-1ðþûbçÍÄ.
Î.±c²lãìêÏlÓÙ¬®Ã`\Â;ÄjÐ"¾G1«Úý*qTqÚ?Óí/X'¶¡WÙOPK
SwH¼,ØÖ<tv/ouya/console/api/CancelIgnoringOuyaResponseListener.classPËJÃ@=£iÆjw.\¸²ºpÀ²)B°`®'qSâLÉ£ÐÏr%¸ðü¨Ò.jAsçÌ¹¯3çkýñ	àÇøz¸°öÇOÏarÏÅRðBèOÓ¹Ìê úMÅõf%xfte
ÉÅBñ)²Z%cUÕRË2L 
ìPiUGç¡3YÜçÚJç»z®ÚuÖÄ¼Ha¬´|h^SY&"-éÏT®EÝ½iÊLÞ©61ÚÖÉàý½áfæ¿Õ0ÿûYë{ä)¹IN·¬¥èÑë´ãÞå;¬7ítácøSzÒeélù4sÐMvpØÝý
PK
SwHRo¿?ô*tv/ouya/console/api/CreditCardInfo$1.classS]OA=ÓÝv]¥T©b-*VØeÁÏ	i!iRÔ¤£>M»kY²ÌéÃ¿ñÍW}D£?Àe¼³ÖÚF73³sÏ=÷ÌÝ?¿|pM,¸câ®	×ÄC,0ä5\ÔpÉB
,¤1eÁ@NÃ´9\Ñ0k£¢UÌØ$Y°qN¥cTJsr7ä¢ë¶"îZÜeØqê£ÁÿÛyõ
N£òæTìY{ßïDTÎÑ¡+ûGÜíHÑ¡ïòw[S¾D5®¼x+ºè4¹ð<WöÜç\uüp2NôÉxæDUõ@ÑCª&=Á$¤¢Þå.ëÂS[¢ÊtÇö¤Ç`7ðU-ä½ß#B3þÓþAÛW/x;$É£GýjjyP{}ëd>ßîrèôA¹	²Ë«m]Á£¾¢$«%ûdc;Ð

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I placed the Java source for the plugin here:

github.com

tgraupmann/UE4_Plugin_Cortex_App_Store/blob/master/ExampleProject/Plugins/OuyaSDKPlugin/Build/Android/src/tv/ouya/sdk/PluginTestGameActivity.java

package tv.ouya.sdk;

import android.util.Log;
import com.epicgames.ue4.GameActivity;

public class PluginTestGameActivity {	

	private static final String TAG = PluginTestGameActivity.class.getSimpleName();

	private static TestOnGameActivityListener sTestOnGameActivityListener = new TestOnGameActivityListener();

	static {
		Log.i(TAG, "*** registerOnGameActivityListener ***");
		GameActivity.registerOnGameActivityListener(sTestOnGameActivityListener);
	}
	
	// Need to invoke a static method to trigger the static constructor
	public static void initialize() {		
		Log.i(TAG, "*** initialize ***");
	}

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I can build successfully, so that’s good. Now I just have to figure out how to get the plugin to initialize.

I need to figure out how to get the StartupModule() method in the UE4 plugin loading which should put something in the logcat.

github.com

tgraupmann/UE4_Plugin_Cortex_App_Store/blob/master/ExampleProject/Plugins/OuyaSDKPlugin/Source/OuyaSDKPlugin/Private/OuyaSDKPlugin.cpp#L48

    
      
          #endif
          
          
class FOuyaSDKPlugin : public IOuyaSDKPlugin
          {
          	/** IModuleInterface implementation */
          	virtual void StartupModule() override;
          	virtual void ShutdownModule() override;
          };
          
          
IMPLEMENT_MODULE( FOuyaSDKPlugin, OuyaSDKPlugin)
          
          
DEFINE_LOG_CATEGORY(LogOuyaSDKPlugin);
          
          
void FOuyaSDKPlugin::StartupModule()
          {
          	// This code will execute after your module is loaded into memory (but after global variables are initialized, of course.)
          
          
	if (IOuyaSDKPlugin::IsAvailable())
          	{
          		UE_LOG(LogOuyaSDKPlugin, Log, TEXT("*** OuyaSDKPlugin has loaded. ***"));
          	}

I can see that the plugin is enabled using the menu item Edit->Plugins and slicking on Project I see the plugin has enabled checked.

The type of plugin that I’m creating is referred to as an “Installed Plugin” in the docs.