import android.app.AlertDialog;

import android.content.DialogInterface;

        new AlertDialog.Builder (this)

        .setTitle ("Alerting Message")

        .setMessage ("你好！")

        .setPositiveButton("确定",new DialogInterface.OnClickListener() {  

            @Override

            public void onClick(DialogInterface dialog, int which) {

                //do nothing - it will close on its own

            }

         })