在gridview中的圖像更改他們在android中的滾動位置

Question

我想填充我的Gridview與一些TextViews和Imageviews。我成功地做到了，但當我在網格中向下滾動時，圖像會改變它們的位置。我已經讀過一些與同一問題有關的其他問題;像這個question，但它沒有幫助我。

Aadapter

public class ItemListBaseAdapter extends BaseAdapter { 

private static ArrayList<ItemDetails> itemDetailsrrayList; 

private LayoutInflater l_Inflater; 

private Context context; 

// private OnClickListener listner; 

public ItemListBaseAdapter(Context context, ArrayList<ItemDetails> results) { 
    itemDetailsrrayList = results; 
    l_Inflater = LayoutInflater.from(context); 
    this.context = context; 
} 

public int getCount() { 
    return itemDetailsrrayList.size(); 
} 

public Object getItem(int position) { 
    return itemDetailsrrayList.get(position); 
} 

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

public View getView(int position, View convertView, ViewGroup parent) { 
    ViewHolder holder; 
    if (convertView == null) { 
     convertView = l_Inflater.inflate(R.layout.activity_gridview_items, 
       null); 
    holder = new ViewHolder(); 
    convertView.setTag(holder); 
    } else { 
     holder = (ViewHolder) convertView.getTag(); 
    }  

    holder.txt_itemName = (TextView) convertView 
      .findViewById(R.id.tv_item_title); 
    holder.txt_itemDescription = (TextView) convertView 
      .findViewById(R.id.tv_item_detail); 
    holder.txt_itemPrice = (TextView) convertView 
      .findViewById(R.id.tv_item_price); 
    holder.itemImage = (ImageView) convertView 
      .findViewById(R.id.iv_item_image); 
    holder.txt_itemName 
      .setText(itemDetailsrrayList.get(position).getName()); 
    holder.txt_itemDescription.setText(itemDetailsrrayList.get(position) 
      .getItemDescription()); 
    holder.txt_itemPrice.setText("Rs " 
      + itemDetailsrrayList.get(position).getPrice()); 
    holder.itemImage.setImageBitmap(itemDetailsrrayList.get(position) 
    .getImage()); 

    return convertView; 
} 

static class ViewHolder { 
    TextView txt_itemName; 
    TextView txt_itemDescription; 
    TextView txt_itemPrice; 
    ImageView itemImage; 
    Button likeBtn; 
    Button addBtn; 
    } 
} 

Answer 1

你需要調用findViewById時convertView == null。

if (convertView == null) { 
    convertView = l_Inflater.inflate(R.layout.activity_gridview_items, parent, false); 
    holder = new ViewHolder(); 

    holder.txt_itemName = (TextView) convertView 
     .findViewById(R.id.tv_item_title); 
    holder.txt_itemDescription = (TextView) convertView 
     .findViewById(R.id.tv_item_detail); 
    holder.txt_itemPrice = (TextView) convertView 
     .findViewById(R.id.tv_item_price); 
    holder.itemImage = (ImageView) convertView 
     .findViewById(R.id.iv_item_image); 

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