Android适配器之基于BaseAdapter定义AbslistView万能适配器

推荐优先本地搜索浏览 Android适配器之DataModifyHelper数据操作类的封装

定义BaseAdapter抽象基类，抽取共性部分，即实现getCount、getItem、getItemId

观察源码可知，在构造函数中实例化DataModifyHelper对象，该对象负责数据的增删改查等操作。适配器中提供getDataModifyHelper方法，供外界获得操作数据的DataModifyHelper帮助类。

public abstract class AbsUnityBaseAdapter<T> extends BaseAdapter implements INotifyAdapterDataSetChange {    private static final UtilsLog lg = UtilsLog.getLogger(AbsUnityBaseAdapter.class);    private LayoutInflater layoutInflater;    private IAdapterDataModifyHelper<T> IAdapterataModifyHelper;    /**     * 构造方法     */    protected AbsUnityBaseAdapter() {        this.IAdapterataModifyHelper = new DataModifyHelper<>();    }    public IAdapterDataModifyHelper<T> getDataModifyHelper() {        this.IAdapterataModifyHelper.setNotifyAdapterDataSetChange(this);        return IAdapterataModifyHelper;    }    @Override    public void notifyAdapter() {        notifyDataSetChanged();    }    /**     * default method     */    @Override    public int getCount() {        return IAdapterataModifyHelper.getDataResources().size();    }    @Override    public T getItem(int position) {        //可能数组越界        if (position >= IAdapterataModifyHelper.getDataResources().size()) {            lg.e("getItem:index " + position + " is out of size " + IAdapterataModifyHelper.getDataResources().size());            return null;        }        return IAdapterataModifyHelper.getDataResources().get(position);    }    @Override    public long getItemId(int position) {        return position;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        UnityAdapterViewHolder helper = null;        if (convertView != null) {            helper = (UnityAdapterViewHolder) convertView.getTag();        } else {            if (layoutInflater == null) {                layoutInflater = LayoutInflater.from(parent.getContext());            }            helper = new UnityAdapterViewHolder(layoutInflater, getLayoutId(), parent);        }        convert(IAdapterataModifyHelper.getDataResources().get(position), helper, position);        return helper.getConvertView();    }    /*自定义抽象方法*/    public abstract void convert(T itemEntity, UnityAdapterViewHolder helper, int position);    public abstract int getLayoutId();}

分析getView部分源码可知，其基于UnityAdapterViewHolder类封装ViewHolder模式，构造方法如下：

/** * Created by Administrator on 2015/8/25. */public class UnityAdapterViewHolder {    private SparseArray<View> views;    private View convertView;    public UnityAdapterViewHolder(LayoutInflater layoutInflater, int layoutId, ViewGroup parent) {        this.views = new SparseArray<>();        this.convertView = layoutInflater.inflate(layoutId, parent, false);        this.convertView.setTag(this);    }    public View getConvertView() {        return convertView;    }    /**     * generateView     *     * @param viewId     * @param <T>     * @return     */    protected <T extends View> T generateView(int viewId) {        View view = views.get(viewId);        if (view == null) {            view = convertView.findViewById(viewId);            views.put(viewId, view);        }        return (T) view;    }    /**     * @param viewId     * @param clz     * @param <T>     * @return     */    public <T extends View> T generateView(int viewId, Class<T> clz) {        return generateView(viewId);    }}

业务层使用方式如下：

adapter = new AbsUnityBaseRecyclerAdapter<CorePageEntity>() {    @Override    public void convert(CorePageEntity itemEntity, UnityRecyclerAdapterViewHolder viewHolder, int position) {              viewHolder.generateView(R.id.tvItemCommon, TextView.class).setText(itemEntity.getCorePageTitle());    }    @Override    public int getItemLayoutId(int viewType) {        return R.layout.simple_item_horizontal;    }};

对于数据修改等操作，基于以下方式调用即可轻松实现。

adapter.getDataModifyHelper().setDataResource(        CorePageEntity.create(TestActivity.class),        CorePageEntity.create(PullToRefreshActivity.class));

源码链接：https://github.com/xiaoxuan948/AndroidUnityLab/tree/master/unity_base_dev_helper/src/main/java/com/coca/unity_base_dev_helper/adapter

来自为知笔记(Wiz)

来源：https://www.cnblogs.com/linux007/p/5800905.html