關於ViewHolder複用，我就不說明了，關鍵是複用導致出現的問題

網路的好壞，我們請求的圖片並不是很穩定，那麼我們假設一屏可以顯示6條資料，利用複用，我們的第7條資料view就是我們的第1條資料view，隨之手勢不斷的滑動，複用的問題，就出現，特別是上網請求網路圖片， 我們在顯示第7條資料時，圖片還是第1個數據圖片，因為第7條很可以沒有載入完成，導致view複用，圖片錯亂，那麼如何解決呢

1. 給每個 ImageView設定tag ,tag 的內容就是唯一的url
2. 非同步載入類中輸入url
3. 在非同步載入類，完成後，對比ImageView的tag與url是否一致
4. 一致就設定圖片，不一致，就不設定，同時setImageBitmap(null)來解決閃爍問題

public class Myadapter extends BaseAdapter {

    private List<Info.DataBean> list;

    public Myadapter(List<Info.DataBean> list) {
        this.list = list;
    }

    @Override
    public int getCount() {
        return list == null ? 0 : list.size();
    }

    @Override
    public
 
 Object getItem(int position) {
        return list.get(position);
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        Info.DataBean bean = list.get(position);
        MyViewHolder viewHolder = null
 
;
        if (convertView == null) {
            convertView = LayoutInflater.from(parent.getContext()).inflate(R.layout.item, parent, false);
            viewHolder = new MyViewHolder();
            viewHolder.iv = (ImageView) convertView.findViewById(R.id.iv);
            viewHolder.cb = (CheckBox) convertView.findViewById(R.id.cb);
            viewHolder.title = (TextView) convertView.findViewById(R.id.item_title);
            convertView.setTag(viewHolder);
        } else {
            viewHolder = (MyViewHolder) convertView.getTag();
        }

        viewHolder.title.setText(bean.getTitle());
        viewHolder.iv.setTag(bean.getImgs().get(0)); //內容為url的tag
        viewHolder.iv.setImageBitmap(null);  //解決閃爍
        new MyNet(viewHolder.iv).execute(bean.getImgs().get(0)); //載入類中url為圖片的url

        return convertView;
    }

    static class MyViewHolder {
        private ImageView iv;
        private TextView title;
        private CheckBox cb;
    }

    class MyNet extends AsyncTask<String, Void, byte[]> {

        private ImageView iv;
        private String path;
        public MyNet(ImageView imageView) {
            this.iv = imageView;
        }
        @Override
        protected byte[] doInBackground(String... params) {
            try {
                URL url = new URL(params[0]);
                path = params[0];
                HttpURLConnection con = (HttpURLConnection) url.openConnection();
                con.setRequestMethod("GET");
                con.setConnectTimeout(5000);
                con.setReadTimeout(5000);
                con.connect();
                if (con.getResponseCode() == HttpURLConnection.HTTP_OK && !isCancelled()) {
                    InputStream inputStream = con.getInputStream();
                    int len;
                    byte[] buff = new byte[1024 * 4];
                    ByteArrayOutputStream bao = new ByteArrayOutputStream();
                    while ((len = inputStream.read(buff)) != -1) {
                        bao.write(buff, 0, len);
                    }
                    inputStream.close();
                    return bao.toByteArray();
                }
            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return null;
        };

        @Override
        protected void onPostExecute(byte[] bytes) {
            super.onPostExecute(bytes);
            if (bytes != null && iv.getTag().equals(path)) { //載入類中，回來直接判斷是不是最新的tag 也 就是最新滑動的item
                iv.setImageBitmap(BitmapFactory.decodeByteArray(bytes,0,bytes.length));
            }
        }
    }
}