比较通用的适配器

文章目录

完成了基本的ViewHolder和List数据管理

public abstract class SimpleBaseAdapter<T> extendsBaseAdapter {
	protected Context context;
	protected List<T> data;

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

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

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

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

	// 返回item的layout资源ID
	public abstract int getItemResoure();

	public abstract View getItemView(int postion,View convertView,ViewHolder holder);

	@Override
	public View getView(int postion,View convertView,ViewGoup 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(postion,convertView,holder);
	}

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

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

		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 remoce(int index) {
		data.remove(index);
		notifyDataSetChanged();
	}

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

在实现时主要关注getItemResource和getItemView方法

• getItemResource返回layout资源ID
• getItemView中利用数据加载Item View