@Override
    public void onBackPressed() {

        final AlertDialog.Builder aleartdialog;

        aleartdialog = new AlertDialog.Builder(MainActivity.this);
        aleartdialog.setIcon(R.drawable.check_symbol);
        aleartdialog.setTitle(R.string.exit_text);
        aleartdialog.setCancelable(false);

        aleartdialog.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                finish();
            }
        });
        aleartdialog.setNegativeButton("No", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.cancel();
            }
        });

        AlertDialog alertDialog = aleartdialog.create();
        aleartdialog.show();


    }