I have a layout in my app that has lots of images, buttons and other layout elements.
The first time the user starts the activity of that layout, it causes the app to freeze for 1 second.
I want to load the heavy layout elements in my splash screen, so that when the user starts that for the first time there is no freezing.
How could I go about adding this feature into my app?
First load all the UI elements and then try to load the images in your respective layout.
Loading the images can be long process, so use async task for that.
For loading the images efficiently you can use the following code shared by Google. Below is the link for that...
http://developer.android.com/training/displaying-bitmaps/load-bitmap.html
You should probably look into AsyncTask Handler. It will also allow you to easily support progressbar.
In case if you have a lot of images to load, you can use image loading libraries refer this link for more Image Loading Library. These libraries load images in background and provides many more options to deal with images.
Related
I am looking to implement lazy loading in my app and I cannot seem to get it done. I've looked everywhere and nothing seems to be working.
My app is a news app making a SQL query to my wordpress website and getting the image URL and the article title associated to the image. The thing is I cannot use list views for this app because I want the first article to be a way bigger image that takes a third of the screen and the title placed on the image (the same way it is done in this image : http://iphone-apple.fr/wp-content/uploads/2010/06/lequipe2-iphone.jpg).
To create the design I have used RelativeLayout. Each article is a RelativeLayout composed of an ImageView and a TextView.
My problem is that all of the tutorials I found on lazy loading for ImageViews on the internet are for ListViews.
I have tried AsyncTask but it did not work. It actually worked but it showed all of the images at the end of the load so I had a black screen for about 5-10 secs before showing the main activity.
Does anyone have any idea how I could proceed ?
Thanks a lot for all of your answers ! :)
May be you are working with Native Emulator that work in slow environment.Install bluestack emulator or try to work on some android device
I'm trying to create a highscore viewpager in my game.
In the highscore viewpager I would like to have a horizontaly scrollable background.
I found the parralex background, but I could not get it to work.
In another thread here on stackoverflow I found a link to a custom viewpager class.
This also uses parralex background, but I dont want to replace the entire viewpager class.
This is the link
How can I get a scrollable background in a viewpager ?
Thanks in advance !
implement ViewPager.OnPageChangeListener in your Activity and in onPageScrolled change your background to match the current position
I've implemented something similar to what you want:
AsyncBackgroundViewPager
This is a widget that allows you to asynchronously load an image via a network call, cache it to a device. The same image will then be decoded when you need to display it again. Unfortunately, the widget has a dependency on a image caching library that I have written (which does have bugs in it). The widget does work though and it does pretty much provide a way to load a large background over a ViewPager.
You can hack it also to any requirements that you need. I will be uploading a version with out dependencies once I've finished it, which will be soon, so keep an eye out if you want.
Depending on how much of the background you want to show, you can simply change the on draw method to draw some specified width (currently it covers all of the ViewPager).
The project has a working MainActivity and you should be able to run right off the bat after downloading.
I have created an app that gives a lot of imformation on various topics and stuff. My app has a lot of images and all are between 200 and 290KB (jpg). I have a Sliding drawer with Imagebuttons (around 41 ImageButons). When selecting the category (For example going from the main menu to the information Activity) with these ImageButtons it takes about 2 seconds to load. However when selecting a imagebutton it displays the image almost instantly. Is there a way of speeding up the loading process going from the main menu to the information Activity?
around 41 ImageButons
do you really need 41 image buttons? Cannot it be something smarter (like regular button with the same drawable as background so it looks like image button and is not and does not required 41 images to be opened, decoded and used? Also using PNG instead of JPEG could improve this. But in general, rethink your UI
You must load your image asynchronously: the interface loads immediately, but the image processing tasks are done in parallel and your images will appear progressively.
Basically, you must use AsyncTask. The developer portal provides a great tutorial with a downloadable and usable code sample.
http://developer.android.com/training/displaying-bitmaps/index.html
One question: What is your Sliding Drawer for? How many buttons are visible at once? If you just display a few at once and slide through all others via a "right-to-left" swipe then you really should use a ViewPager (introduced in api-level 13 I think and available through the support library for every api-level above 4).
What it does: It just loads the ImageButtons that are visible (much like a ListView does), so there would be no need for one layout with 41 ImageButtons. You just design a Fragment that gets dynamically the different image buttons. Check the documentation for more information: Link
I have code that reloads images via HTTP from the main thread and displays them, right after setting up the layout.
This is now deprecated since network access must no longer be done from the main thread.
At first, I changed it to load the images from a a background thread and then update the ImageViews. But, the user experience changed since the images now "pop out."
Is it possible to make the images load seamlessly?
Or, should I display a progress bar or status message while the images reload.
Seamless loading would require to delay to display your entire ui which is probably not what you want. You could use an animation to fade in your images once they are loaded.
Ive looked into the ViewFlipper, but defining 40 different views in one XML doc just doesn't seem like a bright idea. I know there has to be a better way, I just don't know how. I have spent some time trying to find a answer with no good answer so far.
I have used the Gallery widget (admittedly quite heavily modified) to display 200 fullscreen images in an image viewer for a client.
Alternatively you could use a ViewAimator with either 2 (in this case ViewFlipper) or 3 views (3 if you want to preload both the next and previous images). If you go for this approach then Laurence beat me to suggesting this idea ;) However I'd add that you would want to extend the ViewAnimator/ViewFlipper class to allow it to accept some type of Adapter.
A simple approach would be to simply contain two ImageViews within the ViewFlipper. Then when you request the next or previous view, set the new image resource for the next view and flip.
If you implement a lazy loader using AsyncTask or a Handler this will stop your UI thread from blocking.
Hope this helps!
You could use a ViewPager (included in the Android compatibility library if you need to support pre-Honeycomb devices).