[借鉴] Android简便通用的SimpleBaseAdapter

public abstract class SimpleBaseAdapter<T> extends BaseAdapter {

    protected Context context;
    protected List<T> data;

    public SimpleBaseAdapter(Context context, List<T> data) {
        this.context = context;
        this.data = data == null ? new ArrayList<T>() : data;
    }

    @Override
    public int getCount() {
        return data.size();
    }

    @Override
    public Object getItem(int position) {
        if (position >= data.size())
            return null;
        return data.get(position);
    }

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

    /**
     * 该方法需要子类实现，需要返回item布局的resource id
     *
     * @return
     */
    public abstract int getItemResource();

    /**
     * 使用该getItemView方法替换原来的getView方法，需要子类实现
     *
     * @param position
     * @param convertView
     * @param parent
     * @param holder
     * @return
     */
    public abstract View getItemView(int position, View convertView, ViewHolder holder);

    @SuppressWarnings("unchecked")
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if (null == convertView) {
            convertView = View.inflate(context, getItemResource(), null);
            holder = new ViewHolder(convertView);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }
        return getItemView(position, convertView, holder);
    }

    public class ViewHolder {
        private SparseArray<View> views = new SparseArray<View>();
        private View convertView;

        public ViewHolder(View convertView) {
            this.convertView = convertView;
        }

        @SuppressWarnings("unchecked")
        public <T extends View> T getView(int resId) {
            View v = views.get(resId);
            if (null == v) {
                v = convertView.findViewById(resId);
                views.put(resId, v);
            }
            return (T) v;
        }
    }

    public void addAll(List<T> elem) {
        data.addAll(elem);
        notifyDataSetChanged();
    }

    public void remove(T elem) {
        data.remove(elem);
        notifyDataSetChanged();
    }

    public void remove(int index) {
        data.remove(index);
        notifyDataSetChanged();
    }

    public void replaceAll(List<T> elem) {
        data.clear();
        data.addAll(elem);
        notifyDataSetChanged();
    }
}

public class TestFoodListAdapter extends SimpleBaseAdapter<String> {

    public TestFoodListAdapter(Context context, List<String> data) {
        super(context, data);
    }

    @Override
    public int getItemResource() {
        return R.layout.listitem_test;
    }

    @Override
    public View getItemView(int position, View convertView, ViewHolder holder) {
        TextView text = holder.getView(R.id.text);
        text.setText(getItem(position));
        return convertView;
    }
}