Android：如何永久修改ListView的子項（View） - 滾動後顏色會丟失

Question

list.setOnItemClickListener(new OnItemClickListener() { 
    public void onItemClick(AdapterView<?> parent, View view, 
      int position, long id) { 

     View v = parent.getChildAt(position); 
     TextView fileName = (TextView) v.findViewById(R.id.file_name); 
     fileName.setTextColor(Color.BLUE); 


    } 
}); 

OnItemClick（），我將項目元素的文本顏色設置爲藍色（file_name）。

滾動列表視圖此之後，新的顏色（藍色）丟失（它被重置爲默認顏色）

爲什麼？我必須以某種方式更改與ListView關聯的適配器嗎？

編輯：FileListAdapter（用於填充的ListView）

package com.landa.adapter; 
import java.io.File; 


public class FileListAdapter extends BaseAdapter { 
    private final Context context; 
private final File[] data; 

public FileListAdapter(Context context, File[] values) { 
    this.context = context; 
    this.data = values; 
} 

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

    LayoutInflater inflater = (LayoutInflater) context 
      .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 

    View rowView = inflater.inflate(R.layout.list_row, parent, false); 

    File f = data[position]; 

    TextView textView = (TextView) rowView.findViewById(R.id.file_name); 
    TextView fullPath = (TextView) rowView.findViewById(R.id.full_path); 
    ImageView imageView = (ImageView) rowView.findViewById(R.id.file_image); 

    textView.setText(f.getName()); 
    fullPath.setText(f.getAbsolutePath()); 
    imageView.setImageResource(
      BrowseHandler.getFileIconResourceId(f.getAbsolutePath())); 

    return rowView; 

} 

public int getCount() { 
    return data.length; 
} 

public Object getItem(int position) { 
    return position; 
} 

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

}

Answer 1

你不應該改變這種onClick內TextView的文本顏色 - 你應該標記您的適配器範圍內的項目點擊 - 你如何做，取決於你。

將項目標記爲點擊後，您可以通知ListView數據已更改，並會刷新列表 - 在此期間，您的Adapter可以檢查新點擊的狀態並更改顏色。 ListView。

Answer 2

是的，你需要更改適配器;準確地說，你必須通過擴展ArrayAdapter來創建一個自定義的。

特別是你必須重寫getView(int position, View convertView, ViewGroup parent)以顯示已經點擊的項目的藍色。

相當容易，this tutorial might help，否則問。

編輯編輯編輯

試試這個方法，如果是你想要什麼：

public int flag=-1;//CREATE A FLAG TO STORE THE POSITION OF THE ITEM CLICKED 

//Other stuff... 
//... 

list.setOnItemClickListener(new OnItemClickListener() { 
public void onItemClick(AdapterView<?> parent, View view, 
     int position, long id) { 

    View v = parent.getChildAt(position); 
    TextView fileName = (TextView) v.findViewById(R.id.file_name); 
    fileName.setTextColor(Color.BLUE); 
    flag=position;//WHIT THIS YOU KEEP TRACK OF THE ITEM THAT WAS CLICKED 

} 
}); 

//Other stuff... 
//... 

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

LayoutInflater inflater = (LayoutInflater) context 
     .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 

View rowView = inflater.inflate(R.layout.list_row, parent, false); 

File f = data[position]; 

TextView textView = (TextView) rowView.findViewById(R.id.file_name); 
TextView fullPath = (TextView) rowView.findViewById(R.id.full_path); 
ImageView imageView = (ImageView) rowView.findViewById(R.id.file_image); 

//NOW YOU CHECK IF THAT POSTION WAS THE ONE CLICKED, IT SETS THE COLOR BLUE 
if(position==flag) textView.setTextColor(Color.BLUE); 

textView.setText(f.getName()); 
fullPath.setText(f.getAbsolutePath()); 
imageView.setImageResource(
     BrowseHandler.getFileIconResourceId(f.getAbsolutePath())); 

return rowView; 

} 

所以基本上你使用：

public int flag=-1;

flag=position;

if(position==flag) textView.setTextColor(Color.BLUE);