怎么取消setSingleChoiceItems 的焦点？


return new AlertDialog.Builder(LogSetting.this)
     .setTitle(R.string.log_switch_title)
     .setSingleChoiceItems(R.array.set_log_switch, sLogOnOffValue, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) {

dismissDialog(DIALOG_LOG_SWITCH);

if (which == LOG_OPEN) {
isRetLogSwitchValue = ProjectMenu.logOnOff(true);
// SystemProperties.set(LOGCAT_KEY_START, LOGCAT_VALUE);
SystemProperties.set(LOGCAT_KEY, LOGCAT_VALUE_START);
new AlertDialog.Builder(LogSetting.this)
.setMessage(isRetLogSwitchValue ? R.string.log_open_success 
: R.string.log_open_fail)
.setPositiveButton(R.string.yes, null)
.show();
                        if (isRetLogSwitchValue) {
                            sLogOnOffValue = LOG_OPEN;
                        } else {
                            sLogOnOffValue = LOG_CLOSE;
                        }
                        Log.d(TAG,String.valueOf(sLogOnOffValue));
我想打开失败的时候，让item的两个焦点都为不选中的状态，应该怎么设置啊。目前是，虽然必有一个为选中的状态