In my Listview, i want to load images while scrolling also as Pinterest app does.
I know there are solutions like using UIL and Volley to stop image loading on scroll to avoid lag but then how Pinterest people are handling this situation without any lag?
Anyone has any idea about this?
load images in other thread and cancel thread if image is no longer needed. Load image with using BitmapFactory.Options and inSampleSize. This movie should be helpful http://www.youtube.com/watch?v=pMRnGDR6Cu0
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I have a recyclerview that I want to display images that I have saved in drawables in jpeg. For loading I was using an Async Task, but this doesn't preload or Cache them. I was told to use one of the tools like fresco or glide to do that, but which one can do the Job better?
The most important thing for me is that the app doesn't crash, but it would also be nice to be able to preload certain images already before the View is displayed and afterwards preload as many as memory allows.
You can use Fresco for this. An example for a recycler view that loads images from the network can be found here:
https://github.com/facebook/fresco/blob/master/samples/showcase/src/main/java/com/facebook/fresco/samples/showcase/drawee/DraweeRecyclerViewFragment.java
I have to show an image into imageview in my layout for recycleview' s row.
RecycleView use ViewHolder pattern so my code is in custom ViewHolder.
To load the images I need to use an AsynkTask that return a File in onPostExecute(). In this onPostExecute() I setup imageView with Picasso.
I tried to obtain the same file without use AsynkTask. So I call directly Picaso.with()....
In this scenario, recycleview lag so much when scrolling, but i notified that Picasso cache all images.
The first scenario with AynkTask has more than one problem. Scrolling down and up for x times with 100 row make the queue of asynktask bigger.
Now, if I open a fragment of drawer, queue of Asynkask continues to load and this selected fragment make its work so slowly.
how can I fix it?
I would suggest you to checkout Image Management Library by Facebook that is Fresco that is pretty awesome and mature as compared to other Image Loading Library.
When image in a view goes out of screen it automatically recycles the bitmap, hence releasing the memory (Making scrolling smooth).
Fresco handles all the things caching of images with 3 Tier architecture ( BITMAP_MEMORY_CACHE, ENCODED_MEMORY_CACHE and DISK_CACHE).
It also reduces OOM (Out Of Memory) issues.
I am getting URL string of image in one response, Then i am downloading those images and converting tobitmaps then displaying in listview.
Here my question is in future listview items may increase upto 50000,in this case how can i handle data in listview for smooth scroll without giving ANR Exception.Please provide some sample code.
Dont Load All Images At a Time.... It will cause OutOfMemoryException..you can load images in number of pages from URL....
To download images from URL you can use Picasso library...
It helps you to avoid OutOfMemoryException and store cache of images too..
You can use LAZY LOAD... and you can try this code for download images...
Picasso.with(context).load(URL).fit().centerCrop().into(imageView);
Simple answer dont make a listview so big. 50K elements in a single screen is never a good idea in any scenario(web, desktop or mobile). My suggestion is to have some sort of pagination just like in websites. As for the images like #Prag suggested above use lazy loading for showing images. In my app I used Universal Image Loader and find it extremely useful for showing a large number of bitmaps.
I've a ListView in which each row item contains many ImageViews apart from some content.
That is, there will be many list items, each containing many images.
In order to not to hold user unnecessarily, I'm showing the content first & then downloading the images asynchronously.
Currently, for each image I'm starting a new AsycTask.
Although, it working alright, but this not a good approach.
In place of this, what should I use?
use this library, best in android for image loading..
https://github.com/nostra13/Android-Universal-Image-Loader
Your scenario seems to fit exactly to use LazyLoading of images. This basically loads images in the background and shows them as soon as they're loaded.
You might want to see this:
Lazy load of images in ListView
An alternative would be using a ThreadPoolExecutor with the images to load, but the above works pretty well and is recommended.
Try using the library
http://square.github.io/picasso/
Many common pitfalls of image loading on Android are handled automatically by Picasso:
Handling ImageView recycling and download cancelation in an adapter.
Complex image transformations with minimal memory use.
Automatic memory and disk caching.
I have a listview that loads images form urls
I get lag when when images are out of view. Meaning the ones That i have to scroll to see, seems to be loading from the internet while I am trying to scroll to them.
How can I let the listview load all my images at first run?
I know this is an old question, but for those who have a similar problem:
The Glide Library could help with it. I had this problem as well and I could solve it by using Glide. You can load an image like this:
Glide.with(mContext)
.asDrawable()
.load(mImageUrl)
.into(mViewHolder.mImageView);