通用Adapter，完成对LisetView的优化抽取

//该适配器实现了ListView条目的复用以及控件的复用，不需要再每次getitem时候再找控件与布局

package ;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.RadioButton;import android.widget.TextView;import ;/** * Created by Liz on 2016/5/6. * 实现了listView的优化 */public abstract class MyBaseAdapter extends BaseAdapter {    //实现了listView的优化    public ViewHolder holder = null;    @Override    public abstract int getCount();    @Override    public Object getItem(int position) {        return null;    }    @Override    public long getItemId(int position) {        return 0;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        return initView(position, convertView, parent);    }    //回调init、setLayoutId    public View initView(int position, View convertView, ViewGroup parent) {        int layoutId = setLayoutId();        if (convertView == null) {            convertView = View.inflate(BaseApplication.getInstance(), layoutId, null);            holder = new ViewHolder();            bindHolder(convertView);            convertView.setTag(holder);        } else {            holder = (ViewHolder) convertView.getTag();//            Log.e("```````","复用了");        }        return setWidget(position, convertView, parent);    }    //回调setHolder    public void bindHolder(View convertView) {        setHolder(convertView);//把getView的converView传递给Holder    }    //子类实现用以设置控件UI,返回convertView,返回值不能为空,为convertView    public abstract View setWidget(int position, View convertView, ViewGroup parent);    //子类找到自己的控件并设置给ViewHolder,convertView是getView传递下来的convertView，负责传参,用convertView.findViewById();    public abstract void setHolder(View convertView);    //返回Adapter所在的View的Id    public abstract int setLayoutId();    //添加自己的控件类型    public class ViewHolder {        public ImageView img_01;        public ImageView img_02;        public TextView tv_01;        public TextView tv_02;        public TextView tv_03;        public TextView tv_04;        public TextView tv_05;        public TextView tv_06;        public RadioButton rb_01;    }}//实例
class GetCouponAdapter extends MyBaseAdapter {    @Override    public int getCount() {        return coupon_infos.size();    }    @Override    public View setWidget(int position, View convertView, ViewGroup parent) {        holder.tv_01.setText(coupon_infos.get(position).getCup_amount());        holder.tv_02.setText(coupon_infos.get(position).getCup_name());        return convertView;    }    @Override    public void setHolder(View convertView) {        holder.tv_01 = (TextView) convertView.findViewById(R.id.m_count);        holder.tv_02 = (TextView) convertView.findViewById(R.id.goods_name;    }    @Override    public int setLayoutId() {        return R.layout.item_getcoupon;    }}