Alert Dialog in Android

Write this code where you want to show alert dialog :-

Show alert dialog :

final AlertDialog alertDialog = new AlertDialog.Builder(getActivity()).create();

alertDialog.setMessage("Are you sure you want to delete?");
alertDialog.setButton(AlertDialog.BUTTON_POSITIVE, "Yes", new       DialogInterface.OnClickListener() {

                @Override

                public void onClick(DialogInterface dialog, int which) {

                           //yes button clicked

                }

            });

            alertDialog.setButton(AlertDialog.BUTTON_NEGATIVE, "No", new 
DialogInterface.OnClickListener() {

                @Override

                public void onClick(DialogInterface dialog, int which) {

                    alertDialog.dismiss();

                }
});

alertDialog.show();