@ihtiy4r;

Hocam altaki kodu denermisiniz. "Public static void main" saf java koduduri onun yerine onCreate kullanman gerekir.

import android.support.v7.app.AppCompatActivity;import android.os.Bundle;public class Start extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); System.out.println("Selam"); }