builder.setIcon(R.drawable.ic_system)

                    .setTitle("串口号")

                    .setSingleChoiceItems(mPorts, mSelectIndex,

                            new DialogInterface.OnClickListener() {

                                public void onClick(DialogInterface dialog,

                                        int whichButton) {

                                    mSelectIndex = whichButton;

                                    tv_mainCtlPort

                                            .setText(mPorts[mSelectIndex]);

                                    syscfg.setMainCtlPort(mSelectIndex);

                                    intent.putExtra(Constant.SYSSETING_STRING,

                                            syscfg);

                                    SysSettingActivity.this.setResult(

                                            Constant.SAVESYSCONFIG, intent);

                                    dialog.dismiss();

                                }

                            })

                    .setNegativeButton("取消",

                            new DialogInterface.OnClickListener() {

                                public void onClick(DialogInterface dialog,

                                        int whichButton) {

                                }

                            });