js交互：下载图片到图库

js交互：下载图片到图库（FileLoader类在库中）

    // 下载图片到本地，下载时 1s 加载框时间
    public void getImg(final String imgUrl) {
        loadingDialog = new BjrsProgressDialog(activity);
        loadingDialog.show();
        File sdCard = Environment.getExternalStorageDirectory();
        File directory_GetImg = new File(sdCard, "image");
        final String savepath = directory_GetImg + "/" + DataDispose.getStringMD5(imgUrl) + ".jpg";
        new Thread(new Runnable() {
            @Override
            public void run() {
                final FileLoader fl = new FileLoader();
                File f = new File(savepath);
                if (fl.loadNetFile(imgUrl, savepath)) {

                    // 延时操作
                    TimerTask task = new TimerTask() {
                        @Override
                        public void run() {
                            if (loadingDialog != null && loadingDialog.isShowing()) {
                                loadingDialog.dismiss();
                            }
                            activity.runOnUiThread(new Runnable() {
                                @Override
                                public void run() {
                                    File f = new File(savepath);
                                    if (f.exists() || f.length() != 0) {
                                        Toast.makeText(activity, "图片已保存到->" + savepath, Toast.LENGTH_SHORT).show();
                                    } else {
                                        Toast.makeText(activity, "图片已保存到->" + savepath, Toast.LENGTH_SHORT).show();
                                    }
                                }
                            });
                        }
                    };
                    Timer timer = new Timer();
                    timer.schedule(task, 1000);//1秒后执行TimeTask的run方法

                    Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.fromFile(f));
                    activity.sendBroadcast(intent);
                }
            }
        }).start();
    }