Question

我从webservice获取数据并将它们存储在sqlite中并将它们显示在网格中。数据包含项目ID，项目名称，项目图像现在我想从sqlite获取项目的id当我点击网格中的任何项目以及项目位置!!我怎么能这样做？

我的代码是::

         gridView.setOnItemClickListener(new OnItemClickListener() 
         {
                public void onItemClick(AdapterView<?> parent, View v, int position, long id)
                {
                    System.err.println("cache_id=="+id);
                    System.err.println("position=="+position);
                    Intent i = new Intent(getApplicationContext(), BookContent.class);
                    i.putExtra("id", position);
                    System.err.println("this is item id::"+v.getId());

                    startActivity(i);

                }
         });

我的imageAdapter类是::

private class ItemsAdapter extends BaseAdapter implements ListAdapter
{
    String[] items;
    public ItemsAdapter(Context context,int textViewResourceId,String[] items) 
    {
        this.items = items;
    }
    public View getView( int POSITION, View convertView,ViewGroup parent)
    {
        TextView cap = null ;
        View view = convertView;
        ImageView img = null;
        if (view == null) 
        {
            LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            view = vi.inflate(R.layout.grid, null);
        }
        img = (ImageView) view.findViewById(R.id.image);
        cap = (TextView) view.findViewById(R.id.caption);
        String bookTitle = mapNames.get(POSITION);
        cap.setText(mapNames.get(POSITION));
        img.setImageBitmap(BitmapFactory.decodeByteArray(map.get(POSITION), 0, map.get(POSITION).length));
        return view;
    }
    public int getCount() 
    {
        return items.length;
    }
    public Object getItem(int position) 
    {
        return position;
    }
    public long getItemId(int position) 
    {
        return position;
    }
}

Answer 1

单击网格项时，您不需要再次从sqlite数据库中携带itemid。您可以为view.setTag(String.valueOf(itemid));方法中的每个网格视图元素设置类似getView()的内容。

在onItemClick()中，获取标记。

public void onItemClick(AdapterView<?> parent, View v, int position, long id)
                {
                   ......................
                    .........................
                    String itemid = (String) v.getTag();
                  ..............................
                     i.putExtra("itemid", itemid);

                }

Answer 2

抱歉，我使用了错误的方法。请看下面的答案。只需更改此方法

public long getItemId(int position) 
{
   return items.get(position).getId();
}

现在，您可以在gridView的项目点击中获取id的值。

Answer 3

String items[] items; //your array...
    gridView.setOnItemClickListener(new OnItemClickListener() 
             {
                    public void onItemClick(AdapterView<?> parent, View v, int position, long id)
                    {
                        //System.err.println("cache_id=="+id);
                        //System.err.println("position=="+position);
                       String name =item.get(position).toString();

                        Intent i = new Intent(getApplicationContext(), BookContent.class);
                        i.putExtra("id", position);
                        System.err.println("this is item id::"+v.getId());

                        startActivity(i);

                    }
             });

Answer 4

为什么不将ID保存在数组中

String[] items;
int[] ids;
public ItemsAdapter(Context context,int textViewResourceId,String[] items,int[] ids) 
{
    this.items = items;
    this.ids=ids;
}

然后在你的oncliklistener

gridView.setOnItemClickListener(new OnItemClickListener() 
     {
      public void onItemClick(AdapterView<?> parent, View v, int position, long   id)
            {
                System.err.println("cache_id=="+id);
                System.err.println("position=="+position);
                Intent i = new Intent(getApplicationContext(), BookContent.class);

                 //in this part
                i.putExtra("itemid", itemid);
                i.putExtra("id", this.ids[position]);
                startActivity(i);

            }
     });

如何获取项目ID以及android网格中的项目位置

4 个答案: