android - 如何在自己的适配器中获取arraylist的位置

Question

我想将数组列表（项目）的位置设置到我自己的列表视图适配器中。

 holder.txtViewTitle.setText(title.get(position)); 

但我得到了错误。请检查以下代码。

我也得到了 setImageResource 的错误。

 holder.imgViewLogo.setImageResource(images[position]);  

谢谢。

public class LazyAdapter extends BaseAdapter{

private activites context;
private ArrayList<String> title;
private String[] images;
private LayoutInflater inflater;


public LazyAdapter(activites activites,String[] img ,ArrayList<String> items) {  
    super();  

    this.context = activites;  
    this.title = items;  
    this.images = img; 

}  

@Override  
public int getCount() {  
    // TODO Auto-generated method stub  
    return title.size();  
}  

@Override  
public Object getItem(int position) {  
    // TODO Auto-generated method stub  
    return null;  
}  

@Override  
public long getItemId(int position) {  
    // TODO Auto-generated method stub  
    return 0;  
}  

public static class ViewHolder  
{  
    ImageView imgViewLogo;  
    TextView txtViewTitle;  

}  

@Override  
public View getView(int position, View convertView, ViewGroup parent) {  
    // TODO Auto-generated method stub  

    ViewHolder holder;  
    if(convertView==null)  
    {  
        holder = new ViewHolder();  
        convertView = inflater.inflate(R.layout.activity_listitem, null);  

        holder.imgViewLogo = (ImageView) convertView.findViewById(R.id.activity_list_logo);  
        holder.txtViewTitle = (TextView) convertView.findViewById(R.id.activity_list_title);  

        convertView.setTag(holder);  
    }  
    else  
        holder=(ViewHolder)convertView.getTag();  

    holder.imgViewLogo.setImageResource(images[position]);  
    holder.txtViewTitle.setText(title.get(position));  


    return convertView;  
}   

}

Answer 1

这是我认为的问题：

    private String[] images;

你应该声明它：

   private Integer[] images;

希望这会有所帮助

Answer 2

public class LazyAdapter extends BaseAdapter{

private activites context;
private ArrayList<String> title;
private String[] images;
private LayoutInflater inflater;
 Bitmap myBitmap;


public LazyAdapter(activites activites,String[] img ,ArrayList<String> items) {  
    super();  

    this.context = activites;  
    this.title = items;  
    this.images = img; 

}  

@Override  
public int getCount() {  
    // TODO Auto-generated method stub  
    return title.size();  
}  

@Override  
public Object getItem(int position) {  
    // TODO Auto-generated method stub  
    return null;  
}  

@Override  
public long getItemId(int position) {  
    // TODO Auto-generated method stub  
    return 0;  
}  

public static class ViewHolder  
{  
    ImageView imgViewLogo;  
    TextView txtViewTitle;  

}  

@Override  
public View getView(int position, View convertView, ViewGroup parent) {  
    // TODO Auto-generated method stub  
 try {
                      url = new URL(images[position]);
                      connection = (HttpURLConnection) url
                                    .openConnection();

                        connection.setDoInput(true);


                            connection.connect();
                             connection.setReadTimeout(120000);
                             InputStream     input = connection.getInputStream();
                             myBitmap = BitmapFactory.decodeStream(input);

                            } catch (IOException e) {
                        e.printStackTrace();
                        return null;
                    }
    ViewHolder holder;  
    if(convertView==null)  
    {  
        holder = new ViewHolder();  
        convertView = inflater.inflate(R.layout.activity_listitem, null);  

        holder.imgViewLogo = (ImageView) convertView.findViewById(R.id.activity_list_logo);  
        holder.txtViewTitle = (TextView) convertView.findViewById(R.id.activity_list_title);  

        convertView.setTag(holder);  
    }  
    else  
        holder=(ViewHolder)convertView.getTag();  

    holder.imgViewLogo.setImageBitmap(myBitmap);  
    holder.txtViewTitle.setText(title.get(position));  


    return convertView;  
}   

}

Answer 3

以下覆盖方法中的小修正。试试这个，让我知道

@Override  
public int getCount() {  
    // TODO Auto-generated method stub  
    return title.size();  
}  

@Override  
public Object getItem(int position) {  
    // TODO Auto-generated method stub  
    return position;  
}  
@Override  
public long getItemId(int position) {  
    // TODO Auto-generated method stub  
    return position;  
}