當視圖向外滾動時，圖像視圖消失

Question

我對此非常着迷 - 確定其列表視圖 - 兩個圖像視圖 - 左側所有listview項目必須每個都有一個圖像 - 左側全部填充。但是 - 我只想用imageview填充3個listitems。據我所知，由於回收利用，其他人（我不希望被填充）必須設置爲隱形。發生什麼事情 - 啓動應用程序時 - 首先看到右側的3個圖像瀏覽 - 但是，當它們滾動出視圖然後返回時 - 它們都消失了。

求助

public View getView(int position, View convertView, ViewGroup parent) { 

    ViewHolder holder; 

    if (convertView == null) { 
     LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     convertView = inflater.inflate(R.layout.main, parent, false); 
     holder = new ViewHolder(); 
     holder.textView = (TextView) convertView.findViewById(R.id.label); 
     holder.imageView = (ImageView) convertView.findViewById(R.id.icon); 
     holder.infoView = (ImageView) convertView.findViewById(R.id.image_icon); 
     convertView.setTag(holder); 
    } 
    else { 
     holder = (ViewHolder) convertView.getTag(); 
    } 

    holder.textView.setText(values[position]); 

    switch (position) { 
     case 0: 
      holder.imageView.setImageResource(R.drawable.conv); 
      holder.infoView.setVisibility(View.GONE); 
      break; 
     case 1: 
      holder.imageView.setImageResource(R.drawable.counting); 
      holder.infoView.setVisibility(View.GONE); 
      break; 
     case 2: 
      holder.imageView.setImageResource(R.drawable.travelling); 
      holder.infoView.setVisibility(View.GONE); 
      break; 
     case 3: 
      holder.imageView.setImageResource(R.drawable.dating); 
      holder.infoView.setVisibility(View.GONE); 
      break; 
     case 4: 
      holder.imageView.setImageResource(R.drawable.restaurant); 
      holder.infoView.setVisibility(View.GONE); 
      break; 
     case 5: 
      holder.imageView.setImageResource(R.drawable.thaidishes); 
      holder.infoView.setVisibility(View.GONE); 
      break; 
     case 6: 
      holder.imageView.setImageResource(R.drawable.time_); 
      holder.infoView.setImageResource(R.drawable.imageicon); 
      break; 
     case 7: 
      holder.imageView.setImageResource(R.drawable.time2); 
      holder.infoView.setVisibility(View.GONE); 
      break; 
     case 8: 
      holder.imageView.setImageResource(R.drawable.colours); 
      holder.infoView.setVisibility(View.GONE); 
      break; 
     case 9: 
      holder.imageView.setImageResource(R.drawable.weather); 
      holder.infoView.setVisibility(View.GONE); 
      break; 
     case 10: 
      holder.imageView.setImageResource(R.drawable.directions); 
      holder.infoView.setVisibility(View.GONE); 
      break; 
     case 11: 
      holder.imageView.setImageResource(R.drawable.emergency); 
      holder.infoView.setVisibility(View.GONE); 
      break; 
     case 12: 
      holder.imageView.setImageResource(R.drawable.zoo); 
      holder.infoView.setVisibility(View.GONE); 
      break; 
     case 13: 
      holder.imageView.setImageResource(R.drawable.shopping); 
      holder.infoView.setVisibility(View.GONE); 
      break; 
     case 14: 
      holder.imageView.setImageResource(R.drawable.bank); 
      holder.infoView.setVisibility(View.GONE); 
      break; 
     case 15: 
      holder.imageView.setImageResource(R.drawable.hotel); 
      holder.infoView.setVisibility(View.GONE); 
      break; 
     case 16: 
      holder.imageView.setImageResource(R.drawable.countries); 
      holder.infoView.setVisibility(View.GONE); 
      break; 
     case 17: 
      holder.imageView.setImageResource(R.drawable.cities); 
      holder.infoView.setImageResource(R.drawable.imageicon); 
      break; 
     case 18: 
      holder.imageView.setImageResource(R.drawable.features); 
      holder.infoView.setImageResource(R.drawable.imageicon); 
      break; 
    } 

    return convertView; 
} 

Answer 1

你回收時的ImageView知名度設置了，但它不進行重置爲可見對於具有第二圖像元素非常感激。這種加入情況下，第二圖像應顯示：

holder.infoView.setVisibility(View.VISIBLE); 

Answer 2

我不能強調不夠，一個18的情況下開關是壞的風格，很辛苦的工作，而且該方法是太長了。您應該重新思考代碼的構建方式 - 將其分解爲更多的方法或類。

至於你的問題，你的意見正在被回收，所以一旦你設置他們走了 - 他們走了。

你只是缺少行：在例6,17和18