def create_signature(self, jar_path): """Create simple signature for package""" hasher = hashlib.sha256() with open(jar_path, 'rb') as f: hasher.update(f.read())
self.status_text.insert(tk.END, f"✅ Conversion successful!\n") self.status_text.insert(tk.END, f"📦 Output: output_path\n") self.status_text.insert(tk.END, f"🔑 Package ID: package_id\n") self.status_text.see(tk.END)
Here's a detailed guide on manual conversion:
Ensure your system environment variables are updated if the installer prompts you to do so. Step 3: Use a VXP Wrapper Tool Convert .jar To .vxp UPD
def increment_version(self, version): """Increment version number for update""" parts = version.split('.') if parts: parts[-1] = str(int(parts[-1]) + 1) return '.'.join(parts)
What (if any) are you seeing when trying to run the app? What is the file size of the original .jar file?
This will decode the .class files to a directory called output.dex . This will decode the
def extract_jar_info(self, jar_path): """Extract application info from JAR manifest""" with zipfile.ZipFile(jar_path, 'r') as jar: # Read manifest if 'META-INF/MANIFEST.MF' in jar.namelist(): manifest = jar.read('META-INF/MANIFEST.MF').decode('utf-8', errors='ignore')
: Many .JAR files rely on specific Java APIs (like MIDP 2.0) that may not have direct equivalents in the MRE environment. If a conversion fails, the app may crash or fail to open on your device. how to install these .VXP files once you've converted them to your phone? How to open VXP file (and what it is) - File.org
Safely eject the phone from your PC. Open the file manager on your phone, navigate to the folder where you pasted the file, and select it to launch the application. Troubleshooting Common Errors how to install these
There are several reasons why you might want to convert .jar to .vxp:
def create_manifest(self, package_id): """Create VXP manifest file""" return f"""Manifest-Version: 1.0
Create a new application project inside the MediaTek MRE SDK.
The easiest way to bridge the gap between these two platforms is by using a .vxp based Java emulator. Instead of converting your game, you install an application on your phone that acts as a virtual J2ME environment.
Feature phones running VXP files often limit app RAM usage to 1MB–3MB. Java games frequently load uncompressed bitmaps into memory.