Question

public class ListViewImgAdapter extends BaseAdapter {                          

    public static final String TAG = "ListViewImgAdapter";                     
    private final int plastic_randomNum = 218947932;                           
    private final int plastic_iconNum = 98367590;                              

    int mGalleryItemBackground;                                                
    private Context mContext;                                                  
    public int pageCount = Broker.model.issueFilter.issueShowingList().size(); 
    public String[] mImageIds;                                                 

    public ListViewImgAdapter(Context c) {                                     
        mContext = c;                                                          
    }                                                                          

    public void updateListSize() {                                             
        pageCount = Broker.model.issueFilter.issueShowingList().size();        
        Log.d(TAG, "RefreshAll, have cells: " + pageCount);                    
    }                                                                          

    public int getCount() {                                                    
        return Broker.model.issueFilter.issueShowingList().size();             
    }                                                                          

    public Object getItem(int position) {                                      
        return position;                                                       
    }                                                                          

    public long getItemId(int position) {                                      
        return position;                                                       
    }                                                                          

    public  View  getView(int position, View convertView, ViewGroup parent) {
        RelativeLayout container ;
//      Log.d(TAG,"GetView. ConvertView "+position+" of "+ Broker.model.issueFilter.issueShowingList().size());
        if (Broker.model.issueFilter.issueShowingList().size()<= position  ) return null;
        if (convertView == null) { 
//          Log.d(TAG,"GetView. ConvertView is null");
            container = new RelativeLayout(mContext);
            IRIssue theIssue = Broker.model.issueFilter.issueShowingList().get(position);   
            final int clickedPosition = position;

.............

Broker.model.issueFilter.issueShowingList（）。get（position）;

我有一个isssueShowingList是一个ArrayList，问题是如何忽略适配器中此列表中的第一个元素？我尝试返回null但它有一些错误，所以有更好的方法吗？感谢

Answer 1

像往常一样返回第一个元素，但也将可见性设置为GONE或在LayoutParams中将高度设置为0。

if(position==0)
convertView.setVisibility(View.GONE);
else
convertView.setVisibility(View.VISIBLE);

或

RelativeLayout.LayoutParams lp=null;
if(position==0)
lp=new RelativeLayout.LayoutParams(-1,0);
else
lp=new RelativeLayout.LayoutParams(-1,-1);

convertView.setLayoutParams(lp);

Answer 2

我认为有更好的选择......

添加字段

private List<YOUR_TYPE> mDatas;
 // OR
private ArrayList<YOUR_TYPE> mDatas;

然后，在你的构造函数

中

public ListViewImgAdapter(Context c) {                                     
        mContext = c;                  
        mDatas = Broker.model.issueFilter.issueShowingList();
        if (mDatas > 0)
            mDatas.remove(0);
    }

如何忽略数组适配器中的第一项

2 个答案: