Caching Bitmap Images - android

I am working with #Xamarin.Android# Application. I don't know how to cache Bitmap images. In Xamarin.Android Application how to cache data?

I'm going to recommend you look at this library
https://github.com/LukeForder/Xamarin-Bindings-Android-Universal-Image-Loader
It is a Xamarin Binding for this Android Library
https://github.com/nostra13/Android-Universal-Image-Loader
And it does everything you want in regards to caching images.
As for caching a byte[] in memory you can create PCL and use this code
http://ranahossain.blogspot.co.uk/2014/01/cache-provider-for-portable-class.html

I recently had to write something to do this, and wasn't able to use the libraries mentioned by Adam because we needed to do some custom post processing of the images before they were cached etc.
I can't share the code I wrote, but I referred to this article heavily. In my case, we also had to load the images remotely before processing, so the prior article on that same site here was a lot a lot of help.

Related

How to load images from internet in android app quickly?

I'm a beginner in android and i want to load some images from internet in my app. I heard about libraries such as Glide and Picasso. Can anyone please tell me which library is the best.
In your title you use the word "quickly". Theres no such thing, unless you have a cache implementation. As you pointed out those two libraries help in retrieving images from the web and displaying them into imageView, also support cache features so that images previously displayed can load faster in the near future.
Simple example of Picasso:
Picasso.get().load("http://i.imgur.com/DvpvklR.png").into(imageView);
Want to know more about cache in Picasso? Check out this answer
According to this article here both are really nice to be used , but I would suggest Picasso because it just updated to 3.0 + it is lighter than Glide when it comes to :
library size and method count .

Android I want to stream images from online database

I am new to Android so I want to create a background wallpaper app. I made the offline version already which displays images from an array using ImageAdapter.
But I want make it online so that the images will be downloaded and displayed from an online database. What would be the simple and best way to do it? An example would be preferred.
You can use Picasso library. Image loading using Picasso is very easy, you can do it like this way
Picasso.with(context).load("http://i.imgur.com/DvpvklR.png").into(imageView);
and in their website you can get every details.
and another Library is Glide. You can use Glide too for loading image..
Just use Picasso, it's pretty simple and lightweight library with good documentation. You also can save images from network with some hacks.
http://square.github.io/picasso/

What is the common way to get images from urls in android application

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.

Reducing Memory leaks Android

When dealing with images in android for bitmap objects I used to recycle them in order to save when moves to the next screen.
But there are times I had to use drawable s instead of bitmaps any way of dealing with these.
Recycle drawable objects just like bitmaps bitmap.recycle() method.
Thanks
You can use third party image libraries. Some good libraries are:
Nostra’s Universal Image loader
Picasso
UrlImageViewHelper by Koush
Volley – by Android team # Google (mainly network library)
Novoda’s Image loader (depraceted)
Additionally you can check technotalkative blog for more details:
Here you go with libraries for better image management:
Picasso
Fresco
I gave you links to description of libraries on purpose, so you get to know them at least a bit before you just drop them in project. Understanding what they are for and basic concepts about them it will will save you a lot of time later.
Here is how to apply HolderPattern to your list to avoid creating of new object over and over.. Again I would advice to read carefully not just to copy-paste.
One more useful tip and more material to learn - Managing Bitmap Memory ;)
Welcome to Android development ;)

What is the best way to download images using multithreading ?

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

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