Android Dialog A Basic Alert Dialog


    AlertDialog.Builder builder = new AlertDialog.Builder(context);
    //Set Title
            //Set Message
            .setMessage("Are you sure?")
            //Set the icon of the dialog
            //Set the positive button, in this case, OK, which will dismiss the dialog and do everything in the onClick method
            .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialogInterface, int i) {
                    // Reset
    AlertDialog dialog = builder.create();
    //Now, any time you can call on:;
    //So you can show the dialog.

Now this code will achieve this:
Dialog Image
(Image source: WikiHow)