Java 如何在android中设置customListView？

我一直在遵循一个教程，但我认为它已经过时了，我已经设置了listView工作所需的一切，但当我运行它时，它说-

 java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.View.findViewById(int)' on a null object reference
                                                   at youknow.smscontrol.jason.testexpandiblelistview.CoustmListViewSettup.getView(CoustmListViewSettup.java:29)

以下是我的XML：

这是我的customListViewSetup类：

 class CustomListViewSetup extends ArrayAdapter<String>{

public CustomListViewSetup(Context context, String[] CMDList){
    super(context,R.layout.coustom_list_item ,CMDList);
}

@Override
public View getView(int position, View convertView, ViewGroup parent){

    LayoutInflater CMDlistInflater = LayoutInflater.from(getContext());
    View coustomView = CMDlistInflater.inflate(R.layout.coustom_list_item, parent, false);

    String CurrentCMDlistitem = getItem(position);
       LINE 29>> TextView CMDlist = (TextView) convertView.findViewById(R.id.CMDnameItem);
    ImageView CMDLaunchArrow = (ImageView) convertView.findViewById(R.id.LaunchArrow);

    CMDlist.setText(CurrentCMDlistitem);
    CMDLaunchArrow.setBackgroundResource(R.drawable.item_launch);




    return coustomView;
}
 }

class CustomListViewSetup扩展了ArrayAdapter{
公共CustomListViewSetup（上下文上下文，字符串[]CMDList）{
超级（上下文，R.layout.coustom\u列表项，CMDList）；
}
@凌驾
公共视图getView（int位置、视图转换视图、视图组父视图）{
LayoutInflater CMDlistInflater=LayoutInflater.from（getContext（））；
View-coustomView=CMDlistInflater.inflate（R.layout.coustom\u列表\u项，父项，false）；
字符串CurrentCMDlistitem=getItem（位置）；
第29行>>TextView CMDlist=（TextView）convertView.findViewById（R.id.CMDnameItem）；
ImageView CMDLaunchArrow=（ImageView）convertView.findViewById（R.id.LaunchArrow）；
CMDlist.setText（CurrentCMDlistitem）；
CMDLaunchArrow.setBackgroundResource（R.drawable.item_launch）；
返回视图；
}
}

提前谢谢你

LayoutInflater CMDlistInflater = LayoutInflater.from(getContext());
View coustomView = CMDlistInflater.inflate(R.layout.coustom_list_item, parent, false);

拆下此线路

更换线路

 TextView CMDlist = (TextView) convertView.findViewById(R.id.CMDnameItem);
ImageView CMDLaunchArrow = (ImageView) convertView.findViewById(R.id.LaunchArrow);

借

LayoutInflater CMDlistInflater = LayoutInflater.from(getContext());
View coustomView = CMDlistInflater.inflate(R.layout.coustom_list_item, parent, false);

 TextView CMDlist = (TextView) convertView.findViewById(R.id.CMDnameItem);
ImageView CMDLaunchArrow = (ImageView) convertView.findViewById(R.id.LaunchArrow);

 TextView CMDlist = (TextView) coustomView.findViewById(R.id.CMDnameItem);
    ImageView CMDLaunchArrow = (ImageView) coustomView.findViewById(R.id.LaunchArrow);