設置一個TextView文字顏色改變全的ListView項目顏色

Question

我設置一個ArrayAdapter這樣的：

@NonNull 
@Override 
public View getView(int position, View convertView, ViewGroup parent) { 
    View view = convertView; 
    if(view == null){ 
     LayoutInflater layoutInflater = LayoutInflater.from(getContext()); 
     view = layoutInflater.inflate(R.layout.row_product_item, null); 
    } 

    TextView txtProductName = (TextView)view.findViewById(R.id.txt_product_name); 
    TextView txtProductRemaining = (TextView)view.findViewById(R.id.txt_product_remaining); 
    TextView txtProductPrice = (TextView)view.findViewById(R.id.txt_product_sale_price); 

    String productName = getItem(position).productName; 
    String productRemaining = Number.floatToStringAsNumber(getItem(position).productRemaining); 
    String productPrice = Number.floatToStringAsPrice(getItem(position).productSellPrice, true); 

    txtProductName.setText(productName); 
    txtProductRemaining.setText(productRemaining); 
    txtProductPrice.setText(productPrice); 

    /** 
    * Coloring 
    */ 
    if (getItem(position).productRemaining <= 0){ 
     txtProductRemaining.setTextColor(Color.parseColor("#ff7f7f")); 
    } 

    return view; 

} 

只要在最後一行的評價返回true，它描繪每一個txtProductRemaining。我只需要繪製評估項目。爲什麼它繪製了整套元素？

Answer 1

ListView重複使用視圖，因此一旦一個項目被着色，其他視圖也會在着色時着色。下面是你需要做的，以避免什麼：

if (getItem(position).productRemaining <= 0){ 
    txtProductRemaining.setTextColor(Color.parseColor("#ff7f7f")); 
} 
else { 
    txtProductRemaining.setTextColor(Color.BLACK));. // Or whatever default color you prefer 
} 

參考：https://developer.android.com/reference/android/widget/ArrayAdapter.html#getView(int，android.view.View，android.view.ViewGroup）