Before starting the conversion, it is important to understand why you cannot simply rename the file extension.
Best for: Old mobile games and apps (Java ME / J2ME).
et1 = findViewById(R.id.et1); et2 = findViewById(R.id.et2); result = findViewById(R.id.result); btn = findViewById(R.id.btn); how to convert jar file to apk for android
You cannot just rename classes.dex to .apk . You need to create a zip with a specific structure:
You can manually convert the bytecode using the dx or d8 tool provided in the Android SDK. Before starting the conversion, it is important to
✅ Works for:
Go to → Build Bundle(s) / APK(s) → Build APK(s) . Once complete, locate the APK in app/build/outputs/apk/debug/ . Before starting the conversion
Example wrapper: