通过listItem.ADD返回始终一个位置= 0

Question

我有一个3个元素的数组，我尝试在listView中绘制。问题是它仅绘制第一个条目，因为GetView始终返回位置= 0。

为什么？我做错了什么？

我的主爪哇（片段）：

public class PSGlobalFragment extends Fragment {
List<PSGitem> listPSGitem;
ListView list;
PSGadaptater psgAdapter;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {  
    return inflater.inflate(R.layout.psglobal, container, false);
}
@Override
public void onActivityCreated(final Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    String ip;
    listPSGitem = new ArrayList<>();
    psgAdapter = new PSGadaptater(getActivity(), listPSGitem);
    listPSGitem.clear();
    StoreDevDiscovery store = new StoreDevDiscovery();
    // this is where I store the data  
    int count = store.getMax();
    for(int i=0;i<count;i++){
        ip = store.getIPDiscovery(i);
        PSGitem item = new PSGitem();
        item.setIp(ip);
        listPSGitem.add(item);
        list.setAdapter(psgAdapter);
    }
}

和我的适配器：

public class PSGadaptater extends BaseAdapter {
    private int size = 0;
    private List<PSGitem> listIp;
    private LayoutInflater layoutInflater;
    Context context;
    public PSGadaptater(Context c, List<PSGitem> objects) {
        context = c;
        listIp = objects;
        layoutInflater = LayoutInflater.from(context);
    }
    @Override
    public void notifyDataSetChanged() {
        size = listIp.size();
        super.notifyDataSetChanged();
    }
    @Override
    public int getCount() {
        return listIp.size();
    }
    public Object getItem(int position) {
        return listIp.get(position);
    }
    public long getItemId(int position) {
        return position;
    }
    private class ViewIPHolder {
        TextView ip_psg;
    }
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewIPHolder viewHolder;
        if(convertView == null) {
            viewHolder = new ViewIPHolder();
            convertView = layoutInflater.inflate(R.layout.listview_item_psg, null);
            viewHolder.ip_psg = (TextView) convertView.findViewById(R.id.ipaddr_psg);
            convertView.setTag(viewHolder);
        } else {
            viewHolder = (ViewIPHolder) convertView.getTag();
        }
        viewHolder.ip_psg.setText(listIp.get(position).getIpaddr());
  // position always = 0 this is my issue    
        return convertView;
    }
}

和pscitem.java：

public class PSGitem {
    private String ip1;
    public String getIp(){
        return ip1;
    }
    public void setIp(String ip){
        ip1 = ip;
    }
}

Answer 1

问题是您是从一个空的项目中创建适配器：

listPSGitem = new ArrayList<>();
psgAdapter = new PSGadaptater(getActivity(), listPSGitem);

如果您希望以后将项目添加到适配器，则应将项目添加到适配器listIp列表变量，然后让适配器使用notifyDataSetChanged()方法知道此更改。

Answer 2

更改下面的on Activitive creativity -created方法。

@Override
public void onActivityCreated(final Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
String ip;
listPSGitem = new ArrayList<>();

listPSGitem.clear();
StoreDevDiscovery store = new StoreDevDiscovery();
// this is where I store the data  
int count = store.getMax();
for(int i=0;i<count;i++){
    ip = store.getIPDiscovery(i);
    PSGitem item = new PSGitem();
    item.setIp(ip);
    listPSGitem.add(item);

}
psgAdapter = new PSGadaptater(getActivity(), listPSGitem);
list.setAdapter(psgAdapter);
}