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

tgraupmann · April 28, 2016, 6:39pm

The AndroidPluginLanguage is quite powerful. The best docs can be found here.
https://github.com/EpicGames/UnrealEngine/blob/4.11/Engine/Source/Programs/UnrealBuildTool/Android/AndroidPluginLanguage.cs

The best example can be found here:
https://github.com/EpicGames/UnrealEngine/blob/4.11/Engine/Plugins/Runtime/GearVR/Source/GearVR/GearVR_APL.xml

I was able to create my own UE4 plugin APL.xml file.

github.com

tgraupmann/UE4_Plugin_Cortex_App_Store/blob/master/ExampleProject/Plugins/OuyaSDKPlugin/Source/OuyaSDKPlugin/OuyaSDKPlugin_APL.xml

<?xml version="1.0" encoding="utf-8"?>
<!--GearVR plugin additions-->
<root xmlns:android="http://schemas.android.com/apk/res/android">
	<!-- init section is always evaluated once per architecture -->
	<init>
		<log text="OuyaSDKPlugin init"/>
	</init>

	<!-- optional files or directories to copy to Intermediate/Android/APK -->
	<resourceCopies>
		<copyFile src="$S(PluginDir)/../../Build/Android/libs/ouya-sdk.jar" dst="$S(BuildDir)/libs/ouya-sdk.jar" />
		<copyFile src="$S(PluginDir)/../../Build/Android/src/tv/ouya/sdk/PluginTestGameActivity.java" dst="$S(BuildDir)/src/tv/ouya/sdk/PluginTestGameActivity.java" />
		<copyFile src="$S(PluginDir)/../../Build/Android/src/tv/ouya/sdk/TestOnGameActivityListener.java" dst="$S(BuildDir)/src/tv/ouya/sdk/TestOnGameActivityListener.java" />
	</resourceCopies>

	<!-- optional additions to proguard -->
	<proguardAdditions>
		<insert>
			-keep class tv.ouya.** {
			*;

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And reference the APL.xml from the UE4 plugin build script.

github.com

tgraupmann/UE4_Plugin_Cortex_App_Store/blob/master/ExampleProject/Plugins/OuyaSDKPlugin/Source/OuyaSDKPlugin/OuyaSDKPlugin.Build.cs#L43


      
          					// ... add private dependencies that you statically link with here ...
          				}
          				);
          
          			DynamicallyLoadedModuleNames.AddRange(
          				new string[]
          				{
          					// ... add any modules that your module loads dynamically here ...
          				});
          
          			if (Target.Platform == UnrealTargetPlatform.Android)
          			{
          				string pluginPath = Utils.MakePathRelativeTo(ModuleDirectory, BuildConfiguration.RelativeEnginePath);
          				AdditionalPropertiesForReceipt.Add(new ReceiptProperty("AndroidPlugin", Path.Combine(pluginPath, "OuyaSDKPlugin_APL.xml")));
          			}
          		}
          	}
          }

And now I have the JAR and JAVA being used directly from the UE4 plugin.

I’ll see if I can make use of the injected Java using the AndroidPluginLanguage next…

Reducing the number of changes in the PR…
https://github.com/EpicGames/UnrealEngine/compare/4.11...tgraupmann:4.11-Cortex?expand=1