initial files

app/src/main/java/com/robtopx/geometryjump/GJConstants.kt

@@ -0,0 +1,9 @@
+package com.robtopx.geometryjump
+
+object GJConstants {
+    const val PACKAGE_NAME = "com.robtopx.geometryjump"
+
+    const val COCOS_LIB_NAME = "cocos2dcpp"
+    const val FMOD_LIB_NAME = "fmod"
+    const val MOD_CORE_LIB_NAME = "geode"
+}

app/src/main/java/com/robtopx/geometryjump/LaunchUtils.kt

@@ -0,0 +1,44 @@
+package com.robtopx.geometryjump
+
+import dalvik.system.BaseDexClassLoader
+import java.io.File
+
+object LaunchUtils {
+    @Suppress("UNCHECKED_CAST")
+    fun addDirectoryToClassPath(directory: String, classLoader: ClassLoader) {
+        // uses code from zhuowei/MCPELauncher
+        try {
+            val clazz = classLoader.javaClass
+            val plField = clazz.superclass.getDeclaredField("pathList")
+            plField.isAccessible = true
+
+            val pathListInst = plField.get(classLoader)
+            val pathListClazz = pathListInst.javaClass
+            val nldField = pathListClazz.getDeclaredField("nativeLibraryDirectories")
+            nldField.isAccessible = true
+
+            val pathList = nldField.get(pathListInst)
+
+            println(pathList)
+
+            if (pathList is ArrayList<*>) {
+                // no safe way to check this type afaik, so casting is needed
+                (pathList as ArrayList<File>).add(
+                    File(directory)
+                )
+            }
+
+            if (classLoader is BaseDexClassLoader && classLoader.findLibrary(GJConstants.COCOS_LIB_NAME) == null) {
+                val anpMethod = pathListClazz.getDeclaredMethod("addNativePath", Collection::class.java)
+
+                anpMethod.invoke(
+                    pathListInst,
+                    listOf(directory)
+                )
+            }
+        } catch (e: Exception) {
+            e.printStackTrace()
+        }
+    }
+
+}