When i develop a android app with download and caching image from internet, i see many app use MemoryLruCache or DiskLruCache to cache image after download. But i want to know why they use them, why don't use the way like: download image, then save image into sd card and after get image from sd card to show it( it is manual way).
I'm newbie in android dev. So please help me to understand it?
Thanks many many times.
well downloading a list of images from url will consume time and also fill up the user memory also....so its better to dynamically load images from url and make its cache and then preview the images from cache..
I hope you did got my point....check some example of lazy loading of image
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Currently I want to make a list like pictures and images on the server when I click on it, it will download the images to the memory device. If the image is downloaded, it will not download again and the image that is not there will be downloaded. Then I want to ask for a solution from everyone, how should I handle the download to be clean and good for performance. Or do you have an example for me to refer to? Thank you!
There are some ways to find out if your image already exists in your phone storage but the best way to find it out is by image name, compare image names before downloading.
I am working on one android application,in that I have to download images from web and I am showing in listview using imageloader.Next time if I am not connected to internet I have to show saved images.So that If I want to save downloaded images where I have to store.I have two ways one way I have to store in sdcard and another one is in database.Is there any alternative way to store images.Image sizes are very small
Try it with Cache? Best way to do this:
http://www.androidhive.info/2014/05/android-working-with-volley-library-1/
Volley gives you a NetworkImageView, this is a "normal" ImageView, but you can give it a URL and volley will do all the rest for you (download, or load from cache, if already loaded).
I'm currently working on an application in college. I have created several games incorporating lots of images. My lecturer however is not happy with the app loading the images from the drawable folder, he wants something more efficient on memory.
Just wondering if anyone knows any solution? i looked at lazyloader and asychronous loading but most examples use images from the web. I need an efficient way to load lots of high quality images from drawable folder to UI.
Here is your options:
Load images from drawable as is now
Reduce images size and use lower quality JPEG for mobile
Create download class and download images from server to SD card and use it from there
If you using images in your app, you can read them from drawable, SD card or online. The image have to be somewhere to load it.
i've got a question about best solution for caching downloaded images. From internet are downloaded URLs of images i want to show with specifig tag. On some other activities will be showed previews of images and after click on preview will be shown image in full size and his description. My idea is save info about image to database with path to directory named after tag in cache directory. When preview should be shown, i look to cache and if there image is, good and if not image will be downloaded
Maybe use a naming convention so you won't need to use the database ?
Like this :
Profil picture for user 1 will be in
tmp/mypackage/pic_cache/user_pic_1.jpg
I am displaying image's from web using Image downloading logic from url, I want to image download at first time only, next time onwards don't download image from web, because First time downloaded image store in cache memory so i display image from cache memory, In case does not exits that image in cache memory, will download otherwise don't need download that image from web , How is it possible any body guide me ho to so this.?
Thanks in advance.
Go with the solution Lazy loading list with images because it does the same trick that you require. i.e. download image once, store it in cache and display as and when it requires.
go thorugh this example given at GitHub: https://github.com/thest1/LazyList
store your images in sdcard.check wheather your images exist in sdcard or not if yes simply display those images otherwise download from web and store in sdcard,display from sdcard