Android :: Lazy Loading In Gallery ?
Jul 5, 2010
I've reviewed some posts about lazy loading but I believe my problem is a bit different.
I have a gallery (my class extends Gallery) which displays 20 rather large in size images (400-500K each). I cannot load them all to gallery since I get an OutOfMemory exception.
So, I created an array of 20 Drawables and initially populated the first 9 elements (the images come from the Web) and set all the rest to null. My intention was this: on a fling to the right, fetch element no. 10 and set to null element no. 0. On another fling to the right fetch element no. 11 and set to null element no. 1 to null. Same logic on a fling left.
The problem is I can fling much faster than the elements are fetched.
My gallery has a BaseAdapter and its getView() looks something like this:
CODE:.......................
How do I tell getView() - if imageArray[position] is still null, show a "loading..." dialog and once it is set repeat yourself with the same position? I don't want to see the imageView empty and then set on the fly. I want to not be able to see the imageView at all until it is set.
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Jul 22, 2010
I try to implements lazy loading of images in a listview. There is no android features to make this, so I should implement it by myself. Have anyone already done this? Take the solution care of scrolling and lazy loading new images and stop to load not more necessary images?
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Dec 8, 2009
I trying a hand at ListViews and my current experiment is aimed at displaying some data in a ListView. The data to be displayed in each row is simple: an image and some text. The images come from a remote server and the textual data is hardcoded. I have a class that downloads images using AsyncTask and caches the list of images fetched as SoftReferences in a LinkedHashMap. I am also passing a reference of the view to this class, so when the image download/cache read is complete the class will set appropriate Bitmap in the view.
Code...
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Sep 22, 2010
I implemented the lazy-loading images in my ListView. I use a AsyncTask to download the image from the internet and bind it to the ImageView in the UIThread. It's working except that when I scroll the ListView vary fast, the downloaded images sometimes are binded into the wrong items in the list.I guess the problem is from the reuse of convertView in the BaseAdapter. Code...
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Nov 1, 2010
In my Android App I have a listview containing 30 rows, and each row consists of several textviews of which one is spannable and sometimes contains a lot of formatted text and images. Those images are loaded from the web asynchroneously: A placeholder is displayed until the image has been downloaded is then replaced by the image. Unfortunately, the rows of the listview are loaded when I scroll over them. This makes the whole thing very slow. Also, those images are loaded from the web again and again, whenever I scroll over the row. can I turn it off, that the ListView rows are loaded when I scroll over them? They should be loaded once when I start the activity and never again.
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Feb 13, 2010
Here are 4 references that I have found for lazy-loading images into a listview in Android. The idea is to display a placeholder image, get the actual image in the background, update the ImageView in the list when the image is available. I've tried to do this in the simplest way possible using an AsyncTask in an Adapter. The outline of that approach is below. Is it flawed? Is there an agreed approach to handling this common task? Code...
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Sep 11, 2009
This is a very common scenario: displaying images in a ListView which have to be downloaded from the internet.Right now I have a custom subclass of ArrayAdapter which I use for the ListView. In my getView() implementation of the ArrayAdapter, I spawn a separate thread to load an image. After the loading is done, it looks up the appropriate ImageView and sets the image with ImageView.setImageDrawable(). So the solution I used is kind of similar to this one: http://stackoverflow.com/questions/541966/android-how-do-i-do-a-lazy-load-of-images-in-listviewThe problem I'm having is that as soon as I make the call to setImageDrawable() on the ImageView, the ListView somehow refreshes all currently visible rows in the list! This results in kind of an infinite loop. Code...
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Mar 4, 2010
Does anybody have an example of lazy loading (about 10,000 items) an Android ListView from a Sqlite databse?
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Sep 19, 2009
Originally posted accidentally in 'introductions'. My bad. Quote: "i7500 refuses to load images. That sounded a little bombastic, sorry. My O2 UK i7500 will not load pictures from the gallery, when changing wallpapers (I basically can't), Picture Frames widget, even Astro's built in viewer returns a message "(whichever activity) in (application whichever -usu. camera?) has stopped responding." Force close.
Baseband I7500XXIH6
Kernel 2.6.27 hudson@andy#1
Build 76XXCSDCBALUM6375
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Jan 20, 2014
Recently I have found when I open the Auto Back up file in the Gallery app, it loads all the thumbnails up to a point and then nothing. The screen shot below shows where the loading stops:
I have tried to following to resolve the issue: Reset phoneCleared Gallery app cache and resetScrolling through the images in filmstrip mode
The photos appear in the new Photos app and on G+.
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Nov 11, 2010
Today I finally upgraded to 2.2 and installed kaosfroyo. As with many other eris owners the camera app shuts out on me so I installed camera360 and I'm pretty happy with it. The only problem I have is the photo gallery and how stupid slow it is. It takes so long to load my pictures (which is pretty few) that my screen turns off after waiting. And when I go back into it, it attempts to reloads all the pictures again, just to have the screen turn off(again)! I never had this problem with 2.1 (xtrROM).
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Mar 15, 2010
I've written an app, thats loading images either using the android gallery app or by taking a photo using the cam. When I now load an image using the gallery, everything is fine. When the code is being executed a second time (for loading another image), the application crashes.
try { Uri data = intent.getData();
ContentResolver cr = this.getContentResolver();
Bitmap mBitmap = null;
mBitmap = Media.getBitmap(cr, data);
imageView.setImageBitmap(mBitmap);
} catch(Exception e){ showToast(this, "Failed loading image from gallery");
return;
}
The code crashes at the line:
mBimap = Media.getBitmap(cr, data);
Everything is initialized, there are no null values etc. The strange thing is: no exception is thrown, I don't get into the catch block to determine whats going wrong. Am I not allowed to "re-use" the content resolver? Do I have to free it after the first usage or something like this?
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Jan 28, 2009
Here is the code that I have been using, first it will display the image cached on the android app and then lazy load the other image from the web but from the debugger, it does not look like it fully works. Code...
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Oct 1, 2010
I have found this example http://stackoverflow.com/questions/541966/android-how-do-i-do-a-lazy-load-of-images-in-listview/3068012#3068012 from Fedor which is absolutely great for what I need.
I have a question. if beside the Clear Cache button there would be a button with Cancel. How could I in onClick cancel the image download thread from the UI? code...
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Oct 24, 2010
What is Lazy List? This folder appears on my SD Card with over 7mb of randomness. This folder appears out of no where. I've deleted and it seems not to hurt anything (probably should know what the heck I am deleting first, heh) but anyway after deletion it comes back again but it takes a little time.
One might think it appears to be tied from a market app however I only started getting this after rooting. (I think) I download only well-known popular apps from the Market. My hubby has the same apps and does not have this folder.I've searched google and the answers I get are all the same.. The same question with no definite answer. So anyone know what this is? What is causing this folder? Anyone else have this folder? It's driving me crazy because I like to know what the heck is on my SD CARD.
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May 4, 2009
I want to display a fancy 'loading' image at my app's startup time.
The problem: my startup code is mostly GUI related, hence needs to run on UI thread.
Is there a way to do both - that is run UI-related code on UI thread while an image is displayed to the user?
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Feb 6, 2009
I'm trying to set the selection of a Gallery in code. I would like to have the Gallery smoothly roll down a few items over the duration of a second or two. At frist glance, it appears that two members would to the trick:Gallery.setAnimationDuration(int animationDurationMillis); Gallery.setSelection(int position, boolean animate); It turns out that the setAnimationDuration only seems to affect the rubber-bandy "return-to-center" effect of the Gallery. In other words, when a gallery comes to rest after a fling, and a gallery item is off center, the animationDurationMillis is used to control the duration of the Gallery centering up the item. However, the value seems to have no effect on the setSelection. No matter what value is set with setAnimationDuration, the Gallery seems to render about 2 or 3 frames when flying between items 1 and 10 for example. Is this working as designed? Does anyone know a trick or workaround that would let me properly animate setSelection? I'd be especially grateful if we could do it with an "Ease Out" effect.
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Nov 2, 2009
I've looked through the documentation and I can't seem to figure out how to have the screen blured/greyed when I select an activity that may take a while to load.
This seems to be an Android standard (both the Camera app and the Camcorder app do it when first selected), but I don't see any documentation on it. I even tried looking through the source of these apps on git, but couldn't seem to find it.
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Sep 30, 2010
Anyone know if a good gallery program to replace the 3d gallery in cm6? not being able to rotate pics is really getting annoying
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Apr 30, 2010
How can I turn my album gallery to look like the stock 2.1 gallery?
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Feb 17, 2010
I have two gallery widgets in same screen. If user flings on top gallery widget I would like to replicate the same fling motion on the other gallery widget thats beneath the first one. Is there a way I can possibly achieve this.
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Jul 7, 2010
I am using a Gallery based Coverflow, as suggested here.Is there an event that can be caught, which indicates that a single shift (either left or right) has been made in my gallery/cover flow? To be clear, if I gave the gallery a decent swipe and my center (selected) image has changed 8 times, I would like to catch this event 8 times. OnFling() just indicates a single swipe - regardless how many items have shifted.Getting getSelectedItemPosition() before and after the swipe doesn't help since I need to do some work on every shift.It will also be nice while I am at it, to get the direction of the shift - either right or left.
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Jan 10, 2010
I have a Gallery with a set of images that was downloaded at run time.I followed the example here:http://www.anddev.org/a_androidwidgetgallery_-_example-t332.html but instead of using i.setImageResource(this.myImageIds[position]);I used i.setImageBitmap(bitmaps.get(position));This doesn't fill the entire width of the screen, only as much as the width specified here:i.setLayoutParams(new Gallery.LayoutParams(150, 150)); When I increase this number, the item scales with it instead of showing more images per the example. I've even tried to scale the images before adding them to the set. Not sure what I'm missing, or where other examples of this might be. Any help would be great.
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Oct 29, 2010
Go the original orange rom on my san fransisco...after deleting soe of the orange apps...cant browse the wap..when i click on the internet icon on my main screen...the screen remains white..no orange homepag..however i can access market and youtube...how do i reinstall the default web browse..dont really wanna reset to factory settings...?
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Dec 24, 2009
I see the following in the official description of the ADP2:
Modify and rebuild the Android operating system, and flash it onto a phone.
I'm not able to find anywhere a downloadable 2.0 or 2.0.1 for the ADP2, nor any indication that it could be done. To the contrary I see all kind of discussions suggesting it's either not possible, or at least not YET possible.
May someone please explain a developer withOUT any Android specific background, what is so difficult in uplading a new version of an O/S to a device that's specifically desgined for such purpose?
Do I really need to wait for HTC?
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Aug 18, 2009
I can't get the emulator to load when running programs from Eclipse 3.4.2.
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Dec 22, 2009
I'm still learning how to use the dev tools. Using MotoDev which is Eclipse, I wrote a basic "hello world" app. When I run the program, the emulator starts up. It took a few restarts of the emulator and Eclipse until my Hello World icon appear in the emulator. I noticed at one point that a status message said it was sending over the .apl file, which is when my app finally appeared in the emulator. I made changes to my code (Hello to Goodbye) and now..I can't figure out how to "send" to changed app to the emulator. The original app is not being replaced with the changes. What do I need to be doing to reload the changed application on to the Android emulator?
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Apr 1, 2010
I've done the "Hello World" tutorial which it worked fine the first time I tried it. Now every time I run it I get the emulator's main screen showing up instead of the "Hello World" text. With main screen I mean a background image with the current time and a battery charging icon.
I'm using Log.i in the activity and it seems it's loading fine, because I can see the logs in the LogCat's view.
Is there any known issue about it?
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Mar 11, 2009
Requirement: 1. The program must be on top of SDK only, no hacking! 2. When a TEXT SMS is arriving to Android mobile, the program must intercept the TEXT SMS to analyze the SMS content (access the whole SMS data) 3. In terms of the SMS content, the program determines if the SMS is erased as it doesn't exist. No notification, no update to Inbox UI. 4. Power cycle the Android phone, the SMS is not seen at Notification or message Inbox
Can any one help with the solution? Or which API shall we look into?
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Aug 18, 2010
Not loading for me or my friend anyone know whats going on or another app like it?
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