final Guide_Result result = new Gson().fromJson(str, Guide_Result.class);
//                result.setMessage("http://img4.duitang.com/uploads/blog/201405/19/20140519115336_mQNyR.thumb.224_0.gif");
//                result.setMessage("https://ss0.bdstatic.com/5aV1bjqh_Q23odCf/static/superman/img/logo/bd_logo1_31bdc765.png");
//                獲取圖片bitmap後
//                如果網路和本地是同一張圖片，什麼都不做
//                如果不是同一張，下載網路上的圖片替換到本地
//                如果是同一張，判斷本地檔案是否存在，不存在下載
                if (result !=null ){
                if (!RequestTool.ToMD5(result.getMessage()).equals((String) SPUtils.get(GuideActivity.this, "GuidePic", ""))) {
                    File file = new File((String) SPUtils.get(GuideActivity.this, "GuidePic", ""));
                    if (file.exists()) {
                        Log.e("321", "file.exists()");
                        file.delete();
                    }
                    new Thread(new Runnable() {
                        @Override
                        public void run() {
                            SPUtils.put(GuideActivity.this, "GuidePic", RequestTool.ToMD5(result.getMessage()));
                            File file = new File((String) SPUtils.get(GuideActivity.this, "GuidePic", ""));
                            try {
                                file.createNewFile();
                            } catch (IOException e) {
                                e.printStackTrace();
                            }
                            if (checkURL(result.getMessage())) ;
                            {
                                String suffix = result.getMessage().substring(result.getMessage().length() - 4, result.getMessage().length());
                                Log.e("3321", suffix);
                                if (suffix.equals(".gif")) {
                                    saveGif(result.getMessage());
                                    SPUtils.put(GuideActivity.this, "Picformat", ".gif");
                                } else {
                                    saveBitmap(result.getMessage());
                                    SPUtils.put(GuideActivity.this, "Picformat", ".png");
                                }
                            }
                        }
                    }).start();
                } else {
                    File file = new File((String) SPUtils.get(GuideActivity.this, "GuidePic", ""));
                    if (!file.exists()) {
                        try {
                            file.createNewFile();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                        new Thread(new Runnable() {
                            @Override
                            public void run() {
                                SPUtils.put(GuideActivity.this, "GuidePic", RequestTool.ToMD5(result.getMessage()));
                                if (checkURL(result.getMessage())) ;
                                {
                                    String suffix = result.getMessage().substring(result.getMessage().length() - 4, result.getMessage().length());
                                    Log.e("3321", suffix);
                                    if (suffix.equals(".gif")) {
                                        saveGif(result.getMessage());
                                        SPUtils.put(GuideActivity.this, "Picformat", ".gif");
                                    } else {
                                        saveBitmap(result.getMessage());
                                        SPUtils.put(GuideActivity.this, "Picformat", ".png");
                                    }
                                }
                            }
                        }).start();
                    }
                }