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

tgraupmann · April 29, 2016, 2:02am

Ah yes. That worked like a charm. I was looking in the Android project settings, but there’s the Android SDK project settings with NDK API Level which needed to be set to android-21. I did noticed when I saved changes that this setting doesn’t appear to serialize to disk.

And here is where I enabled the android:isGame setting.

github.com

tgraupmann/UE4_Plugin_Cortex_App_Store/blob/master/ExampleProject/Plugins/OuyaSDKPlugin/Source/OuyaSDKPlugin/OuyaSDKPlugin_APL.xml#L210


      
          			}
          		}
          		</insert>
          	</gameActivityOnActivityResultAdditions>
          
          	<!-- optional updates applied to AndroidManifest.xml -->
          	<androidManifestUpdates>
          		<!-- update the GameActivity application -->
          		<loopElements tag="application">
          			<addAttribute tag="application" name="android:logo" value="@drawable/leanback_icon"/>
          			<addAttribute tag="application" name="android:isGame" value="true"/>
          		</loopElements>
          		<!-- update the GameActivity activity -->
          		<loopElements tag="activity">
          			<setStringFromAttribute result="activityName" tag="$" name="android:name"/>
          			<setBoolIsEqual result="bGameActivity" arg1="$S(activityName)" arg2="com.epicgames.ue4.SplashActivity"/>
          			<if condition="bGameActivity">
          				<true>
          					<!-- add to intent-filter -->
          					<setElement result="intentInfo" value="category"/>
          					<addAttribute tag="$intentInfo" name="android:name" value="android.intent.category.LEANBACK_LAUNCHER"/>

That leaves the last PR. I need the Android input callback to do input remapping. I can’t see any existing functionality that exposes that.
https://github.com/EpicGames/UnrealEngine/pull/2314/files

With this input callback is where I pass the input to Java, pass it through a framework, and then return the remapped input back to the UE4 plugin. This allows games to publish in the Cortex store and as the framework adds support for new controllers, the games won’t need to republish to get all the new mappings.

With the PR request I’ve been able to intercept all the controller KeyEvent and MotionEvent input and redirect that to the UE4 plugin.

github.com

tgraupmann/UE4_Plugin_Cortex_App_Store/blob/master/ExampleProject/Plugins/OuyaSDKPlugin/Source/OuyaSDKPlugin/Private/OuyaSDKPlugin.cpp#L167


      
          	return JNI_OK;
          }
          
          // Use a global variable to cause the constructor to invoke
          AndroidPluginTestSetupCallbackAndroidInput GSetupCallbackAndroidInput;
          
          // define the callback function that will get the android input events
          int32_t AndroidPluginTestHandleRegisterCallbackAndroidInput(struct android_app* app, AInputEvent* event)
          {
          	// check the adb logcat
          	__android_log_print(ANDROID_LOG_VERBOSE, LOG_TAG, "*** This indicates a successful test. The callback was invoked! ***");
          
          	return 0;
          }
          
          // Use the constructor to register the input callback using the global var: `GSetupCallbackAndroidInput`
          AndroidPluginTestSetupCallbackAndroidInput::AndroidPluginTestSetupCallbackAndroidInput()
          {
          	RegisterCallbackAndroidInput(AndroidPluginTestHandleRegisterCallbackAndroidInput);
          }

github.com

tgraupmann/UE4_Plugin_Cortex_App_Store/blob/master/ExampleProject/Plugins/OuyaSDKPlugin/Build/Android/src/tv/ouya/sdk/TestOnGameActivityListener.java#L15


      
          import android.util.Log;
          import android.view.KeyEvent;
          import android.view.MotionEvent;
          import com.epicgames.ue4.GameActivity;
          
          public class TestOnGameActivityListener implements GameActivity.OnGameActivityListener {
          
          	private static final String TAG = TestOnGameActivityListener.class.getSimpleName();
          
          	public boolean dispatchGenericMotionEvent(MotionEvent motionEvent) {
          		Log.i(TAG, "*** dispatchGenericMotionEvent ***");
          		return false;
          	}
          
          	public boolean dispatchKeyEvent(KeyEvent keyEvent) {
          		Log.i(TAG, "*** dispatchKeyEvent ***");
          		return false;
          	}
          		
          	public boolean onActivityResult(int requestCode, int resultCode, Intent data) {
          		Log.i(TAG, "*** onActivityResult ***");

github.com

tgraupmann/UE4_Plugin_Cortex_App_Store/blob/master/ExampleProject/Plugins/OuyaSDKPlugin/Build/Android/src/tv/ouya/sdk/TestOnGameActivityListener.java#L20


      
          public class TestOnGameActivityListener implements GameActivity.OnGameActivityListener {
          
          	private static final String TAG = TestOnGameActivityListener.class.getSimpleName();
          
          	public boolean dispatchGenericMotionEvent(MotionEvent motionEvent) {
          		Log.i(TAG, "*** dispatchGenericMotionEvent ***");
          		return false;
          	}
          
          	public boolean dispatchKeyEvent(KeyEvent keyEvent) {
          		Log.i(TAG, "*** dispatchKeyEvent ***");
          		return false;
          	}
          		
          	public boolean onActivityResult(int requestCode, int resultCode, Intent data) {
          		Log.i(TAG, "*** onActivityResult ***");
          		return false;
          	}
          
          	public void onCreate(Bundle savedInstanceState) {
          		Log.i(TAG, "*** onCreate ***");