第一次加载完后已经缓存了,第二次打开为啥还是会显示进度条 about mojito HOT 21 CLOSED

                                                @Override
                                                public void onClick(int which) {
                                                    Log.e("33","点击保存");
                                                    try {
                                                        URL urlAdd = null;
                                                        urlAdd = new URL(item.getPostAttach().get(0).getAttachPath());
                                                        HttpURLConnection connAdd = (HttpURLConnection) urlAdd.openConnection();
                                                        connAdd.setConnectTimeout(6*1000);  // 注意要设置超时，设置时间不要超过10秒，避免被android系统回收
                                                        if (connAdd.getResponseCode() != 200) throw new RuntimeException("请求url失败");
                                                        InputStream inSreamAdd = connAdd.getInputStream();
                                                        //把图片保存到项目的根目录
                                                        String randNumAdd = CommonUtils.getRandomId();
                                                        CommonUtils.readAsFile(inSreamAdd, new File(Environment.getExternalStorageDirectory()+"/"+"downpic"+randNumAdd+".jpg"));
                                                        File myFile = new File(Environment.getExternalStorageDirectory()+"/"+"downpic"+randNumAdd+".jpg");
                                                        Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
                                                        Uri uri = Uri.fromFile(myFile);
                                                        intent.setData(uri);
                                                        mContext.sendBroadcast(intent);
                                                        CommonUtils.comToast(mContext,"已保存至相册");
                                                    } catch (MalformedURLException e) {
                                                        Log.e("33","异常1:"+e.toString());
                                                    } catch (IOException e) {
                                                        Log.e("33","异常2:"+e.toString());
                                                    } catch (Exception e) {
                                                        Log.e("33","异常3:"+e.toString());
                                                    }
                                                }
                                            }).show();
                                            return false;
                                        }
                                    });