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What is the preferred way of caching different objects (including images) on Android? My goal is to cache some data for quick access, and to keep them available for longer time (for days).
Thanks!
Use a disk cache. Jack Wharton's DiskLruCache is very good https://github.com/JakeWharton/DiskLruCache.
It will save what you want to disk and read from it, and you can build around it to set max-age values for cache.
use Volley for the better caching of images and objects. Its a faster library for android to load data from web.
http://www.androidhive.info/2014/05/android-working-with-volley-library-1/
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Basically I have an old RecyclerView with an Adapter that uses the Cursor directly. As far as I understand it, this isn't ideal because any time I do a Cursor operation like moveToNext() or similar, it performs disk IO, right? and that is happening on the UI thread.
So what is the recommended way for me to implement an infinite (basically keep loading items as the user scrolls) RecyclerView with ContentResolver to display videos or images stored on the phone?
Thanks.
I think that Jetpack's Paging library could be a good solution. As you found yourself it is possible to use it with a ContentProvider
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I'm developing a wallpaper app but I dont exactly know which database I can use to store the images (SQLite or MySQL) .Can you please help me if you have some experience in this domain ?
You should not use a DB to directly store the images as BLOBs, they can get very very bulky.
Instead use any of the above DB and save the Links to your images with your images actually being stored elsewhere.
Good places to store images would be Dropbox, drive etc..
Also there are good CDN providers which allow you to save images and also provide image manipulation as well as caching features.
i use cloudinary...
Also i will suggest you to use Picasso/Fresco/Universal Image Loader for actually handling the images in your app... They will deal with caching/memory and other issues and save you a lot of trouble
The DB is really upto you.. hope this helps
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Should i use AsyncTask to load and scale photos from external storage? or there is easier way to do it? Main reason why im trying to do this is becouse im getting lag when scrolling my listview. Im displaying and scaling photos using its path.
Yes.
It can be a long running task if the photo has a lot of detail. Be careful when dealing with detailed photos on Android, you can run out of memory.
Use the Async Task or Thread to process the photos, but keep the user notified at all times, with a progress bar or notification.
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(https://github.com/novoda/ImageLoader)
VS
(https://github.com/nostra13/Android-Universal-Image-Loader)
I just want to know the differences between Android-Universal-Image-Loader and ImageLoader.
Which is better? Thanks!
Well both are image caching library used for lazy loading images (a process where images are loaded at last just like in a webpage) and other stuffs I used universal image loader and found it to be fantastic. I have not used the other library yet but looking at the github repo it looks promising and offers similar features. The only way to know which is better is by trying it yourself. If you do please let us know.
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I cannot seem to find a clear answer of when to use RenderScript?
Documentation says that we should use it when doing some computing or work with images. This is not so clear especially the part with images.
Can someone give me practical advices when to use it?
For example,
what computing are they talking about?
when should we use RenderScript dealing with Bitmap when there are other methods (or factories) which we can successfully use on such occasions?
Is RenderScript limited only to usage when coding games?
Its really pretty simple. If your application is doing a lot of cpu based data processing (i.e. in Dalvik or the NDK), and you would like a speedup, you should look at RS.
If you don't have a performance problem today I would keep doing what you are doing.