更改ListView中所選條目的背景顏色

Question

我有一個ListActivity，其中顯示了一些條目。一旦選擇了一個條目，我將顯示另一個具有該條目內容的活動。當我回到ListActivity時，我希望未讀條目具有與讀條目不同的顏色。

我有一個數據庫存儲的條目，當我選擇一個數據庫字段COLUMN_READ更新。

我有一個自定義ListAdapter：

public class CustomListAdapter extends SimpleCursorAdapter{ 

     private Context context; 
     private int layout; 

     public CustomListAdapter(Context context, int layout, Cursor c, 
       String[] from, int[] to) { 
      super(context, layout, c, from, to); 
      this.context = context; 
      this.layout = layout; 
     } 


     @Override 
     public View newView(Context context, Cursor cursor, ViewGroup parent) { 

      Cursor c = getCursor(); 
      final LayoutInflater inflater = LayoutInflater.from(context); 
      View v = inflater.inflate(layout, parent, false); 


      int titleCol = c.getColumnIndex(DataBaseSchema.EntrySchema.COLUMN_TITLE); 
      int authorCol=c.getColumnIndex(DataBaseSchema.EntrySchema.COLUMN_AUTHOR_NAME); 
      int readCol= c.getColumnIndex(DataBaseSchema.EntrySchema.COLUMN_READ); 

      String title = c.getString(titleCol); 
      String author = c.getString(authorCol); 
      long read= c.getLong(readCol); 

      TextView name_text = (TextView) v.findViewById(R.id.title); 
      if (name_text != null) { 
       name_text.setText(title); 
      } 

      TextView content_text = (TextView) v.findViewById(R.id.subtitle); 
      if (content_text != null) { 
       content_text.setText(author); 
      } 


      if (read!=0){ 
       name_text.setBackgroundColor(Color.GRAY); 
      } 

      return v; 

     } 

     @Override 
     public void bindView(View v, Context context, Cursor c) { 

      int titleCol = c.getColumnIndex(DataBaseSchema.EntrySchema.COLUMN_TITLE); 
      int authorCol=c.getColumnIndex(DataBaseSchema.EntrySchema.COLUMN_AUTHOR_NAME); 
      int readCol= c.getColumnIndex(DataBaseSchema.EntrySchema.COLUMN_READ); 

      String title = c.getString(titleCol); 
      String author = c.getString(authorCol); 
      long read= c.getLong(readCol); 

      TextView name_text = (TextView) v.findViewById(R.id.title); 
      if (name_text != null) { 
       name_text.setText(title); 
      } 

      TextView content_text = (TextView) v.findViewById(R.id.subtitle); 
      if (content_text != null) { 
       content_text.setText(author); 
      } 


      if (read!=0){ 
       name_text.setBackgroundColor(Color.GRAY); 
      } 
     } 
    } 

而我做的是：

CustomListAdapter present = new CustomListAdapter(context, 
       R.layout.atom_list_row, loadingCursor, new String[] {DataBaseSchema.EntrySchema.COLUMN_TITLE,DataBaseSchema.EntrySchema.COLUMN_AUTHOR_NAME, DataBaseSchema.EntrySchema.COLUMN_READ}, new int[]{R.id.title,R.id.subtitle,R.id.row_container}); 
     setListAdapter(present); 

的問題是，突出顯示的條目無法正確顯示，我不明白爲什麼。實際上背景顏色會隨着所選條目而改變，但對於其他顏色，它似乎是隨機的，並且當我滾動其他條目時，它們的顏色也會改變。 它是一個Android的錯誤？有沒有一些解決方法，或者我錯過了什麼？

在此先感謝..

編輯 我已經找到了解決辦法!!!! 我在代碼的末尾添加了v.refreshDrawableState();。 此代碼的工作：！

public class CustomListAdapter extends SimpleCursorAdapter{ 

     private Context context; 
     private int layout; 

     public CustomListAdapter(Context context, int layout, Cursor c, 
       String[] from, int[] to) { 
      super(context, layout, c, from, to); 
      this.context = context; 
      this.layout = layout; 
     } 

     @Override 
     public View newView(Context context, Cursor cursor, ViewGroup parent) { 

      Cursor c = getCursor(); 
      final LayoutInflater inflater = LayoutInflater.from(context); 
      View v = inflater.inflate(layout, parent, false); 


      int titleCol = c.getColumnIndex(DataBaseSchema.EntrySchema.COLUMN_TITLE); 
      int authorCol=c.getColumnIndex(DataBaseSchema.EntrySchema.COLUMN_AUTHOR_NAME); 
      int readCol= c.getColumnIndex(DataBaseSchema.EntrySchema.COLUMN_READ); 

      String title = c.getString(titleCol); 
      String author = c.getString(authorCol); 
      long read= c.getLong(readCol); 

      TextView name_text = (TextView) v.findViewById(R.id.title); 
      if (name_text != null) { 
       name_text.setText(title); 
      } 

      TextView content_text = (TextView) v.findViewById(R.id.subtitle); 
      if (content_text != null) { 
       content_text.setText(author); 
      } 


      if (read!=0){ 
       v.setBackgroundColor(Color.GRAY); 
      } 
      else v.setBackgroundColor(Color.BLACK); 
      v.refreshDrawableState(); 
      return v; 

     } 

     @Override 
     public void bindView(View v, Context context, Cursor c) { 

      int titleCol = c.getColumnIndex(DataBaseSchema.EntrySchema.COLUMN_TITLE); 
      int authorCol=c.getColumnIndex(DataBaseSchema.EntrySchema.COLUMN_AUTHOR_NAME); 
      int readCol= c.getColumnIndex(DataBaseSchema.EntrySchema.COLUMN_READ); 

      String title = c.getString(titleCol); 
      String author = c.getString(authorCol); 
      //long read= c.getLong(readCol); 

      TextView name_text = (TextView) v.findViewById(R.id.title); 
      if (name_text != null) { 
       name_text.setText(title); 
      } 

      TextView content_text = (TextView) v.findViewById(R.id.subtitle); 
      if (content_text != null) { 
       content_text.setText(author); 
      } 

      //LinearLayout linear =(LinearLayout) v.findViewById(R.id.row_container); 
      if (c.getLong(readCol)!=0){ 
       v.setBackgroundColor(Color.GRAY); 
      }else v.setBackgroundColor(Color.BLACK); 
      v.refreshDrawableState(); 
     } 



    } 

Answer 1

讀這一點，你可以有一個想法Colored item in listview