打造CommonAdapter

来源：互联网发布：发票在线制作软件编辑：程序博客网时间：2024/05/18 00:33

1.创建CommonAdapter类：

public abstract class CommonAdapter02<T> extends BaseAdapter {    protected Context mContext;    protected List<T> datas;    protected LayoutInflater mInflater;    public CommonAdapter02(Context context, List<T> datas) {        this.datas = datas;        mContext = context;        mInflater = LayoutInflater.from(context);        this.datas = datas;    }    @Override    public int getCount() {        return datas.size();    }    @Override    public T getItem(int position) {        return datas.get(position);    }    @Override    public long getItemId(int position) {        return position;    }    /*    * 优化方法二    * */    @Override    public  View getView(int position, View convertView, ViewGroup parent) {        ViewHolder holder = ViewHolder.get(mContext, convertView, parent,R.layout.item_simple_tv,position);        convert(holder,getItem(position));        return holder.getConvertView();    }    public abstract void convert(ViewHolder holder,T t);}

2.ViewHolder类

public class ViewHolder {    private SparseArray<View> mViews;    private int mPosition;    private View mConvertView;    public View getConvertView() {        return mConvertView;    }    /**     * 通过viewId获取控件     * @param viewId     * @param <T>     * @return     */    public <T extends View> T getView(int viewId){        View view = mViews.get(viewId);        if (view == null) {            view = mConvertView.findViewById(viewId);            mViews.put(viewId,view);        }        return (T) view;    }    public ViewHolder(Context context, ViewGroup parent, int layoutId, int position) {        this.mPosition = position;        this.mViews = new SparseArray<>();        mConvertView = LayoutInflater.from(context).inflate(layoutId,parent,false);        mConvertView.setTag(this);    }    public static ViewHolder get(Context context, View convertView            , ViewGroup parent, int layoutId, int position) {        if (convertView == null) {            return new ViewHolder(context,parent,layoutId,position);        }else {            ViewHolder holder = (ViewHolder) convertView.getTag();            // 解决试图复用问题            holder.mPosition = position;            return holder;        }    }}

3.自定义MyAdapter适配器继承CommonAdapter

public class MyAdapter03 extends CommonAdapter02<String> {    public MyAdapter03(Context context, List<String> datas) {        super(context, datas);    }    @Override    public void convert(ViewHolder holder, String o) {        TextView textView = holder.getView(R.id.id_recyclerView);        textView.setText(o);    }}

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