Android listview base class package, single entry package for universal adapter (advanced article)

CommonAdapter

public abstract class CommonAdapter<T> extends BaseAdapter{
    
    

    /**
     * 上下文
     */
    private Context mContext;
    /**
     * 泛型数据
     */
    protected List<T> data;
    /**
     * 布局ID
     */
    private int mItemLayoutId;

    protected CommonAdapter(Context context, List<T> data, int mItemLayoutId){
    
    
        this.mContext=context;
        this.data=data;
        this.mItemLayoutId=mItemLayoutId;
    }

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

    @Override
    public T getItem(int position) {
    
    
        return data.get(position);
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
    
    
        CommonHolder holder = getViewHolder(convertView, parent);
        convert(holder,getItem(position));
        return holder.getConvertView();
    }

    /**
     * 处理数据
     * @param holder ViewHolder
     * @param data 数据
     */
    public abstract void convert(CommonHolder holder, T data);
    
    private CommonHolder getViewHolder(View convertView, ViewGroup parent){
    
    
        return CommonHolder.get(mContext, convertView, parent, mItemLayoutId);
    }
}

CommonHolder

public class CommonHolder {
    
    

    /**
     * 控件ID
     */
    private SparseArray<View> views;
    /**
     * 视图
     */
    private View convertView;

    private CommonHolder(Context context, ViewGroup parent, int layoutId) {
    
    
        views = new SparseArray<>();
        convertView = LayoutInflater.from(context).inflate(layoutId, parent, false);
        convertView.setTag(this);
    }
    
    public static CommonHolder get(Context context, View convertView,
                                   ViewGroup parent, int layoutId) {
    
    
        if (null == convertView) {
    
    
            return new CommonHolder(context, parent, layoutId);
        } else {
    
    
            return (CommonHolder) convertView.getTag();
        }
    }

    /**
     * 获得控件
     * @param viewId 控件id
     * @param <T> 控件泛型
     * @return 控件
     */
    public  <T extends View> T getView(int viewId) {
    
    
        View view = views.get(viewId);
        if (null == view) {
    
    
            view = convertView.findViewById(viewId);
            views.put(viewId, view);
        }
        return (T) view;
    }

    /**
     * 获得视图
     * @return 视图
     */
    public View getConvertView() {
    
    
        return convertView;
    }

    /**
     * 对文本控件赋值
     * @param viewId 控件ID
     * @param text 内容
     */
    public void setText(int viewId, String text) {
    
    
        TextView view = getView(viewId);
        view.setText(text);
    }

    /**
     * 设置控件的监听事件
     * @param viewId 控件ID
     * @param listener 监听器
     */
    public void setOnClickListener(int viewId, View.OnClickListener listener) {
    
    
        View view = getView(viewId);
        view.setOnClickListener(listener);
    }
}

Example

 CommonAdapter<String> commonAdapter = new CommonAdapter<String>(getContext(), mDatas, R.layout.item) {
    
    
            @Override
            public void convert(CommonHolder holder, String data) {
    
    
                holder.setText(R.id.text, data);
            }
        };
 list.setAdapter(commonAdapter);