MyArrayAdapter 比较标准的写法

package com.ali.fridge.supermarket.module;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.ali.fridge.R;
import com.ali.fridge.util.LogUtils;

import java.util.List;

import static com.ali.fridge.util.LogUtils.makeLogTag;

/**
 * Created by xiaomin.wxm on 2016/4/7.
 */
public class MyArrayAdapter extends ArrayAdapter<String> {

    private static final String TAG = makeLogTag(MyArrayAdapter.class);
    private Context mContext;
    private List<String> mString;
    private LayoutInflater mInflater;
    private boolean mFirst = true;
    private int mNowItemSelected;
    private MyViewHolder holder;

    public MyArrayAdapter(Context context, int textViewResourceId, List<String> aStrings) {
        super(context, textViewResourceId, aStrings);
        mString = aStrings;
        mContext = context;
        /*if (mString == null) {
            mString = new ArrayList<>();
            mString.add("推荐");
        }*/
 }

    @Override
 public View getView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            holder = new MyViewHolder();
            mInflater = LayoutInflater.from(mContext);
            convertView = mInflater.inflate(R.layout.goods_item_onecategory, null);
            holder.categoryName = (TextView) convertView.findViewById(R.id.goods_tv_category);
            holder.ivVerticalBar = (ImageView) convertView.findViewById(R.id.goods_img_category_selector);
            convertView.setTag(holder);
        } else {
            holder = (MyViewHolder) convertView.getTag();
        }
        holder.categoryName.setText(mString.get(position));
        if (position == mNowItemSelected) {
            holder.ivVerticalBar.setVisibility(View.VISIBLE);
        } else {
            holder.ivVerticalBar.setVisibility(View.GONE);
        }
        return convertView;
    }

    public void setNewData(List<String> aStrings) {
        LogUtils.LOGD(TAG, "setNewData begin");
        clear();
        mString = aStrings;
        /*if (mString == null) {
            mString = new ArrayList<>();
            mString.add("推荐");
        }*/
 if (mString != null) {
            for (int i = 0; i < mString.size(); i++) {
                insert(mString.get(i), i);
            }
        }
        notifyDataSetChanged();
        LogUtils.LOGD(TAG, "setNewData end");
    }

    /*
     index ： selectitem index  <0 means not selected
     */
 public void setSelected(int index) {
        mNowItemSelected = index;
        notifyDataSetChanged();
    }

    private class MyViewHolder {
        TextView categoryName;
        ImageView ivVerticalBar;
    }
}