How To Convert Jar File To Apk For Android 〈Tested & Working〉

String result = YourClass.someMethod(); TextView tv = findViewById(R.id.textView); tv.setText(result);

System.out.flush(); String output = baos.toString(); runOnUiThread(() -> textView.setText(output)); }).start(); That’s not conversion — that’s rewriting or recompiling. how to convert jar file to apk for android

In MainActivity.java :

import com.yourjarpackage.YourClass; public class MainActivity extends AppCompatActivity @Override protected void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); String result = YourClass

// In your Activity new Thread(() -> { PrintStream originalOut = System.out; ByteArrayOutputStream baos = new ByteArrayOutputStream(); PrintStream ps = new PrintStream(baos); System.setOut(ps); YourJarMainClass.main(new String[]{}); String result = YourClass.someMethod()

If you have a headless JAR, wrapping it into an APK is straightforward. If it has a desktop GUI, you’re better off rewriting the UI for Android.