/**
  * 从文件中拿图片
  *
  * @return
  */
 private static Bitmap getBitmapFromFile(Context con, String url, boolean blean) {
   String imageName = "";
   if (!url.startsWith("http")) {
     imageName = url.substring(url.lastIndexOf("/") + 1);
   } else {
     imageName = Utils.getMD5Str(url);
   }
   if (url.contains("ba57b8e1463b63cb01463b7a18eb0083")) {
     MyLogger.commLog().e(imageName);
   }
   Bitmap bitmap = null;
   File file = null;
   String cacheDir = Utils.getCacheDir(con, "picture");
   if (imageName != null) {
     try {
       file = new File(cacheDir, imageName);
       if (file.exists()) {
         // DisplayMetrics dm = context.getResources().getDisplayMetrics();
         // int hh = dm.heightPixels;// 这里设置高度为800f
         // int ww = dm.widthPixels;// 这里设置宽度为480f
         bitmap = decodeSampledBitmapFromFile(cacheDir + "/" + imageName, 100, 100);
       }
     } catch (Exception e) {
       e.printStackTrace();
       bitmap = null;
     }
   }
   if (bitmap != null) {
     addBitmapToMemoryCache(url, bitmap);
     MyLogger.commLog().d(url);
   }
   return bitmap;
 }
  public ImageDownloader(Context context) {
    super();

    ImageDownloader.context = context;
    cacheDirPath_ = Utils.getCacheDir(context, cacheDirName);
    if (!TextUtils.isEmpty(cacheDirPath_)) {
      File cachedir = new File(cacheDirPath_);
      if (!cachedir.exists()) {
        cachedir.mkdirs();
      }
    }

    if (mMemoryCache == null) {
      createLruCache();
    }
  }
  /** 将下载好的图片存放到文件中 */
  private void setBitmapToFile(String imageName, InputStream is) {
    File file = null;
    FileOutputStream fos = null;
    try {
      file = new File(cacheDirPath_, imageName);
      if (!file.exists()) {
        File file2 = new File(cacheDirPath_);
        file2.mkdirs();
      }

      if (Utils.hasSDCard()) {
        fos = new FileOutputStream(file);
      } else {
        fos = context.openFileOutput(cacheDirName + "/" + imageName, Context.MODE_PRIVATE);
      }

      int len = -1;
      byte[] buffer = new byte[1024];
      while ((len = is.read(buffer)) != -1) {
        fos.write(buffer, 0, len);
        fos.flush();
      }
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      if (fos != null) {
        try {
          fos.close();
        } catch (IOException e) {
          e.printStackTrace();
        }
      }
      if (is != null) {
        try {
          is.close();
        } catch (IOException e) {
          e.printStackTrace();
        }
      }
      Bitmap bitmap = decodeSampledBitmapFromFile(file.getAbsolutePath(), 100, 100);
      if (null != bitmap) {
        Bitmap compressBitmap = BitmapUtil.compressImage(bitmap);
        String cachePath = Utils.getCacheDir(context, "picture");
        setBitmapToFile(cachePath, imageName, compressBitmap);
      }
    }
  }