diff --git a/JavaApp/src/main/java/net/kdt/pojavlaunch/PLaunchApp.java b/JavaApp/src/main/java/net/kdt/pojavlaunch/PLaunchApp.java
index 1f2e8471..6a2d7e51 100644
--- a/JavaApp/src/main/java/net/kdt/pojavlaunch/PLaunchApp.java
+++ b/JavaApp/src/main/java/net/kdt/pojavlaunch/PLaunchApp.java
@@ -13,34 +13,7 @@ import net.kdt.pojavlaunch.prefs.*;
 import net.kdt.pojavlaunch.utils.*;
 import net.kdt.pojavlaunch.value.*;
 
-public class PLaunchApp /* extends UIApplicationDelegateAdapter */ {
-/*
-    @Override
-    public boolean didFinishLaunching(UIApplication application,
-        UIApplicationLaunchOptions launchOptions) {
-        File f = new File(Tools.DIR_HOME_JRE);
-        if (f.exists()) {
-            Thread launchThread = new Thread() {
-                @Override
-                public void run() {
-                    Application.launch(PLaunchJFXApp.class);
-                }
-            };
-            launchThread.setDaemon(true);
-            launchThread.start();
-        } else {
-            WindowAlertController alertController = new WindowAlertController("Error", "OpenJDK is not installed. Please install before enter launcher.", UIAlertControllerStyle.Alert);
-            alertController.addAction(new UIAlertAction("OK",
-                UIAlertActionStyle.Default, (action) -> {
-                    alertController.dismissViewController(true, null);
-                }
-            ));
-            alertController.show();  
-        }
-
-        return true;
-    }
-*/
+public class PLaunchApp {
     public static void main(String[] args) {
 /*
         Thread.setDefaultUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() {
@@ -75,30 +48,13 @@ public class PLaunchApp /* extends UIApplicationDelegateAdapter */ {
             throw new RuntimeException(th);
         }
 */
-
-        System.out.println("Input args: " + Arrays.toString(args));
         System.out.println("We are on java now! Starting UI...");
         org.lwjgl.glfw.CallbackBridge.nativeLaunchUI(args);
 
         LauncherPreferences.loadPreferences();
-
-        System.setProperty("java.library.path", Tools.DIR_DATA + "/Frameworks");
-
-        System.setProperty("javafx.verbose", "true");
-        System.setProperty("javafx.platform", "ios");
-        System.setProperty("glass.platform", "ios");
-        System.setProperty("jfxmedia.platforms", "IOSPlatform");
-        System.setProperty("com.sun.javafx.isEmbedded", "true");
-        
-        System.setProperty("prism.verbose", "true");
-        System.setProperty("prism.allowhidpi", "true");
-        System.setProperty("prism.mintexturesize", "16");
-        System.setProperty("prism.static.libraries", "true");
-        System.setProperty("prism.useNativeIIO", "false");
-        
-        CallbackBridge.windowWidth = (int) 1280; // bounds.getWidth();
-        CallbackBridge.windowHeight = (int) 720; // bounds.getHeight();
-        
+    }
+    
+    public static void launchMinecraft() {
         JREUtils.saveGLContext();
     
         // Start Minecraft there!
diff --git a/JavaApp/src/main/java/org/lwjgl/glfw/CallbackBridge.java b/JavaApp/src/main/java/org/lwjgl/glfw/CallbackBridge.java
index 3f5ae56d..6694b0d5 100644
--- a/JavaApp/src/main/java/org/lwjgl/glfw/CallbackBridge.java
+++ b/JavaApp/src/main/java/org/lwjgl/glfw/CallbackBridge.java
@@ -146,6 +146,12 @@ public class CallbackBridge {
         }
         return currMods;
     }
+    
+    public static void callback_AppDelegate_didFinishLaunching(int width, int height) {
+        windowWidth = width;
+        windowHeight = height;
+        net.kdt.pojavlaunch.PLaunchApp.launchMinecraft();
+    }
 
     public static native boolean nativeAttachThreadToOther(boolean isAndroid, boolean isUsePushPoll);
     /*
diff --git a/Natives/AppDelegate.m b/Natives/AppDelegate.m
index 65879cf2..fec5ac11 100644
--- a/Natives/AppDelegate.m
+++ b/Natives/AppDelegate.m
@@ -4,8 +4,12 @@
 
 #import "AppDelegate.h"
 #import "JavaLauncher.h"
+
 #import <Foundation/Foundation.h>
 
+#import "utils.h"
+#import <math.h>
+
 @interface AppDelegate ()
 
 @end
@@ -16,7 +20,9 @@
 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
   
   NSLog(@"Hello from app launch!");
-  // TODO callback
+  int width_c = (int) roundf([[UIScreen mainScreen] bounds].size.width);
+  int height_c = (int) roundf([[UIScreen mainScreen] bounds].size.height);
+  callback_AppDelegate_didFinishLaunching(width_c, height_c);
 
   return YES;
 }
diff --git a/Natives/input_bridge_v3.c b/Natives/input_bridge_v3.c
index 94cb99be..9ebe6b45 100644
--- a/Natives/input_bridge_v3.c
+++ b/Natives/input_bridge_v3.c
@@ -172,7 +172,20 @@ void closeGLFWWindow() {
     exit(-1);
 }
 
+void callback_AppDelegate_didFinishLaunching(int width, int height) {
+    jclass clazz = (*runtimeJNIEnvPtr_JRE)->FindClass(runtimeJNIEnvPtr_JRE, "org/lwjgl/glfw/CallbackBridge");
+    jmethodID method = (*runtimeJNIEnvPtr_JRE)->GetStaticMethodID(runtimeJNIEnvPtr_JRE, *clazz, "callback_AppDelegate_didFinishLaunching", "(II)V");
+    (*runtimeJNIEnvPtr_JRE)->CallStaticVoidMethod(
+        runtimeJNIEnvPtr_JRE,
+        clazz, method,
+        width, height
+    );
+}
+
 JNIEXPORT jint JNICALL Java_org_lwjgl_glfw_CallbackBridge_nativeLaunchUI(JNIEnv* env, jclass clazz, jobjectArray args) {
+    // Save the JNIEnv pointer for AppDelegate callback 
+    runtimeJNIEnvPtr_JRE = env;
+    
 	int argc = (*env)->GetArrayLength(env, args);
     char **argv = convert_to_char_array(env, args);
     return launchUI(argc, argv);
diff --git a/Natives/utils.h b/Natives/utils.h
index 8cb9f15b..a874f0e7 100644
--- a/Natives/utils.h
+++ b/Natives/utils.h
@@ -26,6 +26,7 @@ jobjectArray convert_from_char_array(JNIEnv *env, char **charArray, int num_rows
 void free_char_array(JNIEnv *env, jobjectArray jstringArray, const char **charArray);
 
 void closeGLFWWindow();
+void callback_AppDelegate_didFinishLaunching(int width, int height);
 
 #endif // _BINARY_UTILS_H_