fix application directory

app/build.gradle

@@ -17,6 +17,11 @@ android {
         vectorDrawables {
             useSupportLibrary true
         }
+        externalNativeBuild {
+            cmake {
+                arguments "-DDOBBY_DEBUG=OFF"
+            }
+        }
     }
 
     buildTypes {
@@ -43,6 +48,12 @@ android {
             excludes += '/META-INF/{AL2.0,LGPL2.1}'
         }
     }
+    externalNativeBuild {
+        cmake {
+            path file('src/main/cpp/CMakeLists.txt')
+            version '3.18.1'
+        }
+    }
 }
 
 dependencies {

app/src/main/cpp/CMakeLists.txt

@@ -0,0 +1,26 @@
+cmake_minimum_required(VERSION 3.18.1)
+
+project(launcherfix)
+
+add_library(launcherfix SHARED launcher-fix.cpp)
+
+find_library(log-lib log)
+target_link_libraries(launcherfix ${log-lib})
+
+include(FetchContent)
+
+FetchContent_Declare(dobby
+        GIT_REPOSITORY https://github.com/jmpews/Dobby
+        GIT_TAG 223aabced0431525c7d45196f9409fc505d58ac8)
+
+FetchContent_GetProperties(dobby)
+if(NOT dobby_POPULATED)
+    FetchContent_Populate(dobby)
+
+    set(DOBBY_DEBUG OFF CACHE INTERNAL "" FORCE)
+    set(DOBBY_GENERATE_SHARED OFF CACHE INTERNAL "" FORCE)
+
+    add_subdirectory("${dobby_SOURCE_DIR}" ${dobby_BINARY_DIR} EXCLUDE_FROM_ALL)
+    target_include_directories(launcherfix PRIVATE ${dobby_SOURCE_DIR}/include)
+    target_link_libraries(launcherfix dobby)
+endif()

app/src/main/cpp/launcher-fix.cpp

@@ -0,0 +1,71 @@
+#include <dlfcn.h>
+#include <android/log.h>
+#include <string>
+#include <dobby.h>
+#include <jni.h>
+
+class DataPaths {
+public:
+    std::string original_data_path;
+    std::string data_path;
+
+    static DataPaths& get_instance() {
+        static auto paths_instance = DataPaths();
+        return paths_instance;
+    }
+
+private:
+    DataPaths() : original_data_path(), data_path() {}
+};
+
+extern "C"
+JNIEXPORT void JNICALL Java_dev_xyze_geodelauncher_LauncherFix_setDataPath(
+        JNIEnv *env,
+        jobject,
+        jstring data_path
+) {
+    auto is_copy = jboolean();
+    auto data_path_str = env->GetStringUTFChars(data_path, &is_copy);
+
+    DataPaths::get_instance().data_path = std::string(data_path_str);
+}
+
+extern "C"
+JNIEXPORT void JNICALL Java_dev_xyze_geodelauncher_LauncherFix_setOriginalDataPath(
+        JNIEnv *env,
+        jobject,
+        jstring data_path
+) {
+    auto is_copy = jboolean();
+    auto data_path_str = env->GetStringUTFChars(data_path, &is_copy);
+
+    DataPaths::get_instance().original_data_path = std::string(data_path_str);
+}
+
+FILE* (*fopen_original)(const char *pathname, const char *mode);
+FILE* fopen_hook(const char* pathname, const char* mode) {
+    auto data_path = DataPaths::get_instance().data_path;
+    auto original_data_path = DataPaths::get_instance().original_data_path;
+
+    if (!data_path.empty() && !original_data_path.empty()) {
+        auto path_str = std::string(pathname);
+        auto pos = path_str.find(original_data_path);
+        if (pos != std::string::npos) {
+            path_str.replace(pos, original_data_path.length(), data_path);
+        }
+
+        return fopen_original(path_str.c_str(), mode);
+    }
+
+    return fopen_original(pathname, mode);
+}
+
+[[gnu::constructor]] [[gnu::used]] void setup_hooks() {
+    auto fopen_addr = dlsym(RTLD_NEXT, "fopen");
+
+    DobbyHook(
+        fopen_addr,
+        reinterpret_cast<void*>(&fopen_hook),
+        reinterpret_cast<void**>(&fopen_original)
+    );
+}

app/src/main/java/dev/xyze/geodelauncher/GeometryDashActivity.kt

@@ -61,6 +61,15 @@ class GeometryDashActivity : ComponentActivity(), Cocos2dxHelper.Cocos2dxHelperL
             e.printStackTrace()
         }
 
+        try {
+            // fixes bugs specific to the new app directory, such as package name
+            LauncherFix.loadLibrary()
+            LauncherFix.setOriginalDataPath(GJConstants.GJ_DATA_DIR)
+            LauncherFix.setDataPath(filesDir.path)
+        } catch (e: UnsatisfiedLinkError) {
+            e.printStackTrace()
+        }
+
         System.load("$gdNativeLibraryPath/lib${GJConstants.FMOD_LIB_NAME}.so")
         System.load("$gdNativeLibraryPath/lib${GJConstants.COCOS_LIB_NAME}.so")
 

app/src/main/java/dev/xyze/geodelauncher/LauncherFix.kt

@@ -0,0 +1,13 @@
+package dev.xyze.geodelauncher
+
+import dev.xyze.geodelauncher.utils.GJConstants
+
+object LauncherFix {
+    fun loadLibrary() {
+        System.loadLibrary(GJConstants.LAUNCHER_FIX_LIB_NAME)
+    }
+
+    external fun setDataPath(dataPath: String);
+
+    external fun setOriginalDataPath(dataPath: String);
+}

app/src/main/java/dev/xyze/geodelauncher/utils/GJConstants.kt

@@ -6,4 +6,8 @@ object GJConstants {
     const val COCOS_LIB_NAME = "cocos2dcpp"
     const val FMOD_LIB_NAME = "fmod"
     const val MOD_CORE_LIB_NAME = "geode"
+    const val LAUNCHER_FIX_LIB_NAME = "launcherfix"
+
+    // this value is hardcoded into GD
+    const val GJ_DATA_DIR = "/data/data/${PACKAGE_NAME}"
 }

app/src/main/java/org/cocos2dx/lib/Cocos2dxBitmap.kt

@@ -14,6 +14,7 @@ import java.util.*
 import kotlin.math.abs
 import kotlin.math.ceil
 
+@Suppress("KotlinJniMissingFunction")
 object Cocos2dxBitmap {
     private lateinit var sContext: WeakReference<Context>
 

app/src/main/java/org/cocos2dx/lib/Cocos2dxRenderer.kt

@@ -4,7 +4,7 @@ import android.opengl.GLSurfaceView
 import javax.microedition.khronos.egl.EGLConfig
 import javax.microedition.khronos.opengles.GL10
 
-@Suppress("unused")
+@Suppress("unused", "KotlinJniMissingFunction")
 class Cocos2dxRenderer : GLSurfaceView.Renderer {
     companion object {
         @JvmStatic