In my project a background service downloads contents from remote database using asynctask. I would like to download all images from urls (saved in database) using Picasso in background service. These images will be used later in my app.
Is there any better solution to do this? or just use the one line code of Picasso in asynctask?
Is there any better solution to do this? or just use the one line code
of Picasso in asynctask?
What do you mean by better? Is it about performance?
If you will have to download a lot of images, you might want to download them on the service. With this, your download will not stopped if the activity is destroyed.
For the library, i never use Picasso. I always use Universal Image Loader but i dont know which one is better. I think the most important feature of those libraries is their capability to cache the images.
UPDATE
For performance, you may want to combine the Picasso/UIL library with PullToRefresh library, especially when your listview/gridview want to load a lot of images.
Related
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/
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 am writing an android app. I have an ArrayAdapter which I am using to display a list of items where part of each item is an image. I am downloading the images asynchronously in the adapers getView() method and I am using a cache to keep it as efficient as possible and stop too many re-downloads. The problem I am facing is that the getView() method for each item can be called by android as many times as it needs to. It is often called faster than the image can actually download and so the same image can be queued many times for download before it even gets into the cache. Is there a best practice for how to prevent the images from being queued for download repeatedly? It just seems like a big waste of mobile data.
If you want to use third party image downloader library then you can use Picasso
Its actullay pretty neat and simple to use. It does caching for your app.
You can refer this tutorial.
Happy learning :)
The accepted best practice that is recommend by Google for downloading and displaying images in a list or recyclerview is to use the Glide library
https://github.com/bumptech/glide
The api looks like this
Glide.with(context)
.load(url)
.centerCrop()
.placeholder(R.drawable.loading_spinner)
.crossFade()
.into(myImageView);
I am able to handle images and text from web URL's in android using AsyncTask, but have a separate question in mind.
Which approach is best suited for storing pictures for one time loading?
IE: Either in an SD Card or in SQLite DB.
If you want to store images for just one time loading, you don't need to store it in Sdcard. You better use a library like Glide or Picasso. It does all the hard work of caching and managing memory for you. It has very simple API.
Glide.with(this).load("http://goo.gl/gEgYUd").into(imageView);
I want to save the images fetched from server for once and from next time i want to check first whether images are stored or not in device, if not then again it should fetch from server and store in user's device again, and if yes then application will use images directly rather than fetching from server again and again. It will be useful for enhancing the speed of application. Basically my application is fetching multiple images from server so i want to save those images on user's android device and from next time application should fetch from device. I think you got my question.
The simple way:
You can use Picasso.
It is a simple lib which provides image downloading and caching.
In my opinion it might not be the fastest, but it is pretty simple and intuitive. It does its job well and none who I asked complained about it.
Picasso
Other libs:
UIL
Volley
Glide
fresco
To make it short. There are lots of other libs. An awesome comparision of the most Populat ones can be found here and here
The do it yourself way:
You can also write you own caching logic with a LRUCache. Which is also pretty simple.
Take a look at:
https://developer.android.com/topic/performance/graphics/cache-bitmap.html
The LRUCache is just a Memory Cache so you might also want to use a DiskLRUCache