适配器设置图片

来源：互联网发布：java 图片验证码开源编辑：程序博客网时间：2024/06/08 10:57

public void dispalyImage(final String picUrl, final ImageView imageView, final ImageCallBack imageCallBack) {
        AsyncTask<Void, Void, Bitmap> asyncTask = new AsyncTask<Void, Void, Bitmap>() {
            @Override
            protected Bitmap doInBackground(Void... voids) {

                try {
                    URL url = new URL(picUrl);

                    HttpURLConnection connection = (HttpURLConnection) url.openConnection();

                    //设置
                    connection.setRequestMethod("GET");
                    connection.setReadTimeout(5000);
                    connection.setConnectTimeout(5000);
                    //获取
                    int responseCode = connection.getResponseCode();
                    if (responseCode == 200){
                        InputStream inputStream = connection.getInputStream();

                        //转成bitmap
                        Bitmap bitmap = BitmapFactory.decodeStream(inputStream);

                        return bitmap;

                    }

                } catch (Exception e) {
                    e.printStackTrace();
                }

                return null;
            }

            @Override
            protected void onPostExecute(Bitmap bitmap) {

                /*if (imageView.getTag().equals(picUrl)){
                    //设置
                    imageView.setImageBitmap(bitmap);

                }*/

                imageCallBack.setSuccessImage(bitmap,imageView);

            }
        };

        asyncTask.execute();

}

//接口回调

public interface ImageCallBack {
public void setSuccessImage(Bitmap bitmap, ImageView imageView);
}

//适配器的

        //显示图片....
        /**
         * 为什么图片会产生错位闪烁?????图片是异步加载+复用的优化的原因
         *
         * 1.imageView要跟自己的url路径匹配起来
         */
        holder.imageView.setTag(list.get(i).getPicUrl());

        //3.设置默认显示的图片
        holder.imageView.setImageResource(R.mipmap.ic_launcher);

        //2.在这个位置能区分出来imageView是当前的控件...借助接口回调的形式把异步获取的图片传递过来
        new ImageHelper().dispalyImage(list.get(i).getPicUrl(),holder.imageView, new ImageCallBack() {
            @Override
            public void setSuccessImage(Bitmap bitmap, ImageView imageView) {

                if (imageView.getTag().equals(list.get(i).getPicUrl())){

                    //
                    imageView.setImageBitmap(bitmap);
                }
            }
        });

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