Android 适配器 adapter 初探

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import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.TextView;import java.util.List;/** * 汉鼎新闻适配器 ListView * Created by fusanjieon 2017/9/11 0011. */public class MyAdapter extends BaseAdapter {    private Context context;    private List<Food> data;    public MyAdapter(Context context, List<Food> data) {        this.context = context;        this.data = data;    }    @Override    public int getCount() {        // TODO Auto-generated method stub        return data.size();    }    @Override    public Object getItem(int position) {        // TODO Auto-generated method stub        return data.get(position);    }    @Override    public long getItemId(int position) {        // TODO Auto-generated method stub        return position;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        if (convertView == null) {            convertView = LayoutInflater.from(context).inflate(R.layout.news_model, null);        }        ImageView iv_img = (ImageView) convertView.findViewById(R.id.iv_icon);        TextView tv_title = (TextView) convertView.findViewById(R.id.tv_title);        TextView tv_desc = (TextView) convertView.findViewById(R.id.tv_des);        Food food = data.get(position);        if (food.getImgData() == null) {            iv_img.setImageResource(R.drawable.timg);//默认        } else {            byte[] imgData = food.getImgData();            Bitmap bm = BitmapFactory.decodeByteArray(imgData, 0, imgData.length);            iv_img.setImageBitmap(bm);        }        tv_title.setText(food.getTitle());        tv_desc.setText(food.getContent());        return convertView;    }}
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