프로그램 종료 다이얼로그 띄우기

BackPressCloseHandler.java

public class BackPressCloseHandler {

    private Activity activity;

    public BackPressCloseHandler(Activity activity) {
        this.activity = activity;
    }


    public void onBackPressed() {
        AlertDialog.Builder ad = new AlertDialog.Builder(activity);
        ad.setTitle("시스템 종료");
        ad.setMessage("프로그램을 종료 하시겠습니까?").setCancelable(false).setPositiveButton("확인", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                // 'YES'
                activity.finish();
            }
        }).setNegativeButton("취소", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                // 'NO'
                return;
            }
        });

        ad.create();
        ad.show();
    }
}

MainActivity.java

public class HomeActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);

    }

    @Override
    public void onBackPressed() {
        //super.onBackPressed();
        new BackPressCloseHandler(this).onBackPressed();
    }



}