android - 仅更改 ListView 中选定条目的背景颜色

Question

我有一个 ListActivity，我在其中显示了一些条目。选择条目后，我会显示另一个包含条目内容的 Activity 。我希望，当我返回到 ListActivity 时，未读条目的颜色与已读条目的颜色不同。

我有一个存储条目的数据库，当我选择一个条目时，数据库字段 COLUMN_READ 会更新。

我有一个自定义的 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);
            }
        }
   }

我所做的是:

 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);

问题是突出显示的条目没有正确显示，我不明白为什么。实际上，所选条目的背景颜色会发生变化，而且其他一些条目的背景颜色似乎是随机的，而且当我滚动其他条目时也会改变它们的颜色。 这是一个Android错误吗？是否有一些解决方法，或者我遗漏了什么？

提前致谢..

编辑 我找到了解决方案!!!! 我在代码末尾添加了 v.refreshDrawableState();。 此代码有效:

 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

读到这里，你会有一个想法Colored item in listview