การใช้งาน AlertDialog.Builder

        final AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setIcon(R.drawable.logo);  /* set icon. */
        builder.setCancelable(false);   /* can't touch out area dialog for closing. */
        builder.setTitle("Title !");  /* set title. */
        builder.setMessage("Messages"); /* set msg. */
        builder.setPositiveButton("Exit", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.cancel();
                finish();
            }
        });
        builder.setNegativeButton("OK", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {

                             /* some thing.. */

            }
        });
        AlertDialog alert = builder.create();
        alert.show(); /* show */