用于交替行颜色的通用阵列适配器？

Question

我正在尝试开发一个通用数组适配器 Class，我想从中继承奇数行和偶数行的行颜色属性。我的通用适配器 Class 是

public class SpecialAdapter<T> extends ArrayAdapter<T> {
    private int[] colors = new int[] { 0x30FF0000, 0x300000FF };

    public SpecialAdapter(Context context, int resource, List<T> items) {
        super(context, resource,items);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View view = super.getView(position, convertView, parent);
        int colorPos = position % colors.length;
        view.setBackgroundColor(colors[colorPos]);
        return view;
    }
}

我想将其扩展到我的适配器 class 以更改行颜色。

public class MyArrayAdapter 扩展了 SpecialAdapter{..}

可能吗？目前它不显示任何颜色。我没有在我的适配器 class 中设置任何颜色。我只需要从基础 class 继承行颜色，这样我就可以将它用于不同的适配器 class.

这是我的适配器class

public MyArrayAdapter(Activity context, List<MyObject> list) {
        super(context, R.layout.mylayout, list);
        this.context = context;
        this.list = list;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        View view = null;
        if (convertView == null) {
            LayoutInflater inflator = context.getLayoutInflater();
            view = inflator.inflate(R.layout.mylayout, null);
            final ViewHolder viewHolder = new ViewHolder();
            viewHolder.txtName = (TextView) view.findViewById(R.id.label);          
            view.setTag(viewHolder);
        } else {
            view = convertView;
            ((ViewHolder) view.getTag()).txtName.setTag(list.get(position));
        }
        ViewHolder holder = (ViewHolder) view.getTag();
        holder.txtName.setText("Position " + position);
        return view;
    }

Answer 1

据我所知没有这种通用的方法。如果只有2种颜色可以用下面的

 @Override
    public View getView(int position, View convertView, ViewGroup parent) {  
    View view = super.getView(position, convertView, parent);  
    if (position % 2 == 1) {
        view.setBackgroundColor(Color.BLUE);  // you can add any color here
    } else {
        view.setBackgroundColor(Color.CYAN);  // don't like cyan? add another color.
    }

    return view;  
    }

Answer 2

我按照 includeMe 的建议进行了一些调整，现在可以正常使用了。我可以将我的布局作为动态传递。

public class SpecialAdapter<T> extends ArrayAdapter<T> {
    private int[] colors = new int[] { 0x30FF0000, 0x300000FF };
    int resource;
    Activity context;
    List<T> items;

    public SpecialAdapter(Activity context, int resource, List<T> items) {
        super(context, resource, items);
        this.resource = resource;
        this.context = context;
        this.items =items;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // View view = super.getView(position, convertView, parent);
        View view = context.getLayoutInflater().inflate(resource, null);
        int colorPos = position % colors.length;
        view.setBackgroundColor(colors[colorPos]);
        return view;
    }

}

并在我的 Adapter class getView 方法中添加了这一行。

view = super.getView(position, convertView, parent);

替换此行。

 view = context.getLayoutInflater().inflate(R.layout.mylayout, null);

现在我不需要在每个适配器中保留颜色更改代码class。 Superclass 会处理的。

用于交替行颜色的通用阵列适配器？

Generic Array Adapter for Alternate Row Color?

android

android-arrayadapter