I see a lot of android applications just look like html pages, containing many images here and there. But I don't know usually how these applications get their images to render. Do they get images through url. I found some posts on the internet suggested to use AsyncTask to download image through a HttpURLConnection . But I think AsyncTask is a little bit too complicated which involves too much code. Can anyone recommend me a simple,brief and may be also standard approach to get images to render in android applications?Any help is much appreciated!
Use an image loading library, like Glide (https://github.com/bumptech/glide), Picasso (http://square.github.io/picasso/) or Fresco (https://github.com/facebook/fresco) among others.
I will suggest using glide as it is lightweight and easy to use.
Glide
And also has its own many features.
I have an Android app that downloads images from Flickr. I use HttpUrlConnection to download from URL, and BitmapFactory.decodeStream() to create a bitmap. I don't know why some images take longer to download than others, even though they have the same sizes. Is it because they are on different servers? Please help me answer this. Thanks everyone.
Downloading images is a sensitive process for mobile apps. So i suggest you to use a library for downloading images such as Universal Image Loader, Picasso etc..
To answer your question yes, downloading images from different servers effects download time but some other reasons can effect download time too.
I'm trying to download image from web. For single image I downloaded successfully. But I want to download more images with multithreading. Any tutorials or leads regarding this will be helpful to me.
As for me, simplest way to do to this - use some third-party library with caching system and post-processing. Most popular is:
1) Picasso from Square team
2) Universal Image Loader
I'm using this library works fine and has a lot of options
I'm making an android app, here the images are getting from Cloud, is it good idea to download images and save it & use it further. Or download images every-time user uses the app, what idea you prefer is the best?
Because downloading images always is slow & its bad i know but at some point if the images are updated then how to get to know about it?
You should definitely cache your downloaded files!
Do it in your internal app directory where only you do have access to (or otherwise external storage, thats still ok).
Bandwidth and connections are always expensive and should kept low as much as possible.
So your user can see images fast even on a bad connection and your app doesn't waste his valuable bandwidth of a users data plan.
Maybe this could also help you:
https://github.com/novoda/ImageLoader
http://www.androidhive.info/2012/07/android-loading-image-from-url-http/
Make it easy on yourself and use something like Android Smart Image View. It takes care of loading and caching, and it's just about a drop-in replacement for Android's ImageView. Universal Image Loader is another alternative, more configurable, but not as quick to implement.
I used https://github.com/nostra13/Android-Universal-Image-Loader
but I think you not want only download and cache.
these no trick ,if you want check weather the image update or not, you can add metadata for image, just like md5 .
in html and browser, you can set expires header for a image:
enter link description here
but in android app, you control all yourself.
Downloading images and saving them is probably the best way to do it because you don't want to download the same images over and over. If the images are updated you can delete the older one and download the new ones. Just make sure you don't download/save a million images. Take a look at this library. It has a built-in cache on sdcard/external sd.
Downloading images from the net for display, with possible requirement of caching is a very common problem that many people have solved, you can try these solutions to see which fits you:
Ion (https://github.com/koush/ion) - very flexible and feature complete, plus it can download more than images but JSON, Strings, Files, and Java types as well. The part that I really like about this is that it can automatically cancel operations when the calling Activity finishes, so users don't waste time & bandwidth downloading images that will no longer be displayed
Universal Image Loader (https://github.com/nostra13/Android-Universal-Image-Loader) - equally capable for most use cases but for downloading/caching images only
I want to develop a gallery which can display images from various Http url's. I am downloading the image through AsyncTask. To download multiple images I have to use same AsyncTask many times for different url's. Its getting very slow. How should I proceed? Is AsyncTask need at all to download the image? Please guide me how should I go about in this app? I don't have much idea about threading.
I suggest you to refer this UniversalImageLoader to fulfill your purpose.
This Example provide a reusable instrument for asynchronous image loading, caching and displaying.
It has the same example which you are looking for(i.e. download the image from the different URL's and Set in Gallery/GridView/ListView).
Hope this helps ... :)