Observable.just(RetrofitHelper.API_BASE_URL + img)            
   .subscribeOn(Schedulers.newThread())               
   .subscribe(new Action1<String>() {                
     @Override                          
     public void call(String s) {                 
       try {                          
         Glide.with(getApplicationContext())         
             .load(s)                   
             .downloadOnly(720, 1280)           
             .get();                   
       } catch (InterruptedException | ExecutionException e) { 
         e.printStackTrace();                 
       }                            
     }                              
   });

 File file = new File(sp_splash_logo);
 if (file.exists()) {
   Glide.with(getApplicationContext()).load(file).into(mIvSplash);
 } else {
   mIvSplash.setImageResource(R.mipmap.splash);
 }

  Retrofit retrofit = new Retrofit.Builder()
      .baseUrl(RetrofitHelper.API_BASE_URL)
      .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
      .build();
  ImgServise imgServise = retrofit.create(ImgServise.class);
  imgServise.downloadPicFromNet(img)
      .subscribeOn(Schedulers.newThread())
      .subscribe(new Action1<ResponseBody>() {
        @Override
        public void call(ResponseBody responseBody) {
          try {
            long contentLength = responseBody.contentLength();
            InputStream is = responseBody.byteStream();
            File file = new File(Environment.getExternalStorageDirectory(), BuildConfig.APPLICATION_ID + "splash.png");
            FileOutputStream fos = new FileOutputStream(file);
            BufferedInputStream bis = new BufferedInputStream(is);
            byte[] buffer = new byte[1024];
            int len;
            long sum = 0L;
            while ((len = bis.read(buffer)) != -1) {
              fos.write(buffer, 0, len);
              sum += len;
              fos.flush();
              //增加下载进度的获取
              Log.d("TAG---", sum + "/" + contentLength);
            }
           fos.close();
           bis.close();
           is.close();
          } catch (IOException e) {
            e.printStackTrace();
          } finally {
            stopSelf();
          }
        }
      }, new Action1<Throwable>() {
        @Override
        public void call(Throwable throwable) {
          stopSelf();
        }
      });