可复用的自定义Adapter
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public abstract class MyAdapter<T> extends BaseAdapter { private ArrayList<T> mData; private int mLayoutRes; //布局id public MyAdapter() { } public MyAdapter(ArrayList<T> mData, int mLayoutRes) { this.mData = mData; this.mLayoutRes = mLayoutRes; } @Override public int getCount() { return mData != null ? mData.size() : 0; } @Override public T getItem(int position) { return mData.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder = ViewHolder.bind(parent.getContext(), convertView, parent, mLayoutRes , position); bindView(holder, getItem(position)); return holder.getItemView(); } public abstract void bindView(ViewHolder holder, T obj); //添加一个元素 public void add(T data) { if (mData == null) { mData = new ArrayList<>(); } mData.add(data); notifyDataSetChanged(); } //往特定位置,添加一个元素 public void add(int position, T data) { if (mData == null) { mData = new ArrayList<>(); } mData.add(position, data); notifyDataSetChanged(); } public void remove(T data) { if (mData != null) { mData.remove(data); } notifyDataSetChanged(); } public void remove(int position) { if (mData != null) { mData.remove(position); } notifyDataSetChanged(); } public void clear() { if (mData != null) { mData.clear(); } notifyDataSetChanged(); } public static class ViewHolder { private SparseArray<View> mViews; //存储ListView 的 item中的View private View item; //存放convertView private int position; //游标 private Context context; //Context上下文 //构造方法,完成相关初始化 private ViewHolder(Context context, ViewGroup parent, int layoutRes) { mViews = new SparseArray<>(); this.context = context; View convertView = LayoutInflater.from(context).inflate(layoutRes, parent, false); convertView.setTag(this); item = convertView; } //绑定ViewHolder与item public static ViewHolder bind(Context context, View convertView, ViewGroup parent, int layoutRes, int position) { ViewHolder holder; if (convertView == null) { holder = new ViewHolder(context, parent, layoutRes); } else { holder = (ViewHolder) convertView.getTag(); holder.item = convertView; } holder.position = position; return holder; } @SuppressWarnings("unchecked") public <T extends View> T getView(int id) { T t = (T) mViews.get(id); if (t == null) { t = (T) item.findViewById(id); mViews.put(id, t); } return t; } /** * 获取当前条目 */ public View getItemView() { return item; } /** * 获取条目位置 */ public int getItemPosition() { return position; } /** * 设置文字 */ public ViewHolder setText(int id, CharSequence text) { View view = getView(id); if (view instanceof TextView) { ((TextView) view).setText(text); } return this; } /** * 设置图片 */ public ViewHolder setImageResource(int id, int drawableRes) { View view = getView(id); if (view instanceof ImageView) { ((ImageView) view).setImageResource(drawableRes); } else { view.setBackgroundResource(drawableRes); } return this; } /** * 设置点击监听 */ public ViewHolder setOnClickListener(int id, View.OnClickListener listener) { getView(id).setOnClickListener(listener); return this; } /** * 设置可见 */ public ViewHolder setVisibility(int id, int visible) { getView(id).setVisibility(visible); return this; } /** * 设置标签 */ public ViewHolder setTag(int id, Object obj) { getView(id).setTag(obj); return this; } //其他方法可自行扩展 } }
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