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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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?
View 3 Replies View RelatedI 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...
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...
View 2 Replies View RelatedHere 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...
View 2 Replies View RelatedThis 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...
View 2 Replies View RelatedWhat 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.
I want to cancel a Toast to show the next one. This is the description of the behavious I want, when I select one element in the menu i display a toast from the actuel menu element, but if i switch from one element to an other quickly i'm creating a list of Toast to display. So i need to cancel the previous one but i never succed. This is an extract of my code: public class MainActivity extends TabActivity
private Toast toast; private String toastMsg;
private void toast(){ if(toast!=null){ toast.cancel(); } toast = Toast.makeText(MainActivity.this, toastMsg,Toast.LENGTH_SHORT);
toast.show(); } }
I m making an application which requires me to list all the images available on the SD-Card of the phone.
i tried querying the ContentResolver way i.e.
Cursor image = getContentResolver().query(Images.Media.EXTERNAL_CONTENT_URI, new String[]{Images.Media._ID,Images.Media.DATA,Images.Media.DISPLAY_NAME}, null, null, null);
but without any result. Is there any way i can get the list or if thats not possible then is there any possible intent (e.g. PICK) by which i can allow the user to select a file and then access the path of the file the user selected?
I am developing an application on the Android Platform for my music service (axcid.org). Haven't spent a huge amount of time in Java but could use a bit of help with this code: http://pastebin.com/m5300a4e6
Bit of bad practice in there I know but I haven't spent a ton of time developing Java apps. Anyways the problem:
if (!this.listLoaded) { //holdup this needs it's own thread
//Url load and parse time. // Now we can start a thread for the search
Thread thread = new Thread(this); thread.start();
I need update media list to be called when:
public void run() { // search
String URL = this.getIntent().getExtras().getString("searchurl");
sm.LoadResults(URL+"?android=1"); listLoaded = true; }
is done. However calling it from the thread will crash Android. Did many google searches but found nothing. How can I call updateMediaList when the thread is complete? (from the UI thread)
I would be retrieving values from SQLite database and have to display it in a list view. So how should I pass the images out from the database into the list view (in fact, I only save the image uri in db). I am able to save and retrieve images individually and display it on the screen. But how do I pass a bitmap and display it in a list view.
View 3 Replies View RelatedI'm working on an Android application that needs to look at what images a user has stored. The problem is that if the user has the sdcard mounted via the USB cable, I can't read the list of images on the disk. Does anyone know of a way to tell if the usb is mounted so that I could just pop up a message informing the user that it won't work?
View 3 Replies View RelatedI am trying to retrieve a list of images and text from a web service. I have first coded to get the images to a list using Simple Adapter.
View 1 Replies View RelatedI am new to android development.I am trying to prepare a list view with check boxes without using android.R.layout.simple_list_item_multiple_choice. xml inbuilt file.But am i facing problems with check box on click events.
View 1 Replies View RelatedIn my project In the first section i have parsed the xml data of Video categories and image url links from My web service.I have parsed that data and receive that data in ArrayList in My main activity.The first ArrayList is the list of video categories and the second ArrayList is the the list of video image urls and i have to display ArrayList of image urls as ImageView in ListView ,i have no idea for that,please give me some solution.
View 2 Replies View RelatedI have a list of 70 text items with image icons(which are stored in drawables folder).
If I launch application the first time and scroll the list slowly - the exception doesn't occur.
When the application is launched the first time and I scroll the list with 'fling' action the following exception occurs:
COD:.....................
After that, if I kill the application with DDMS, start it again and scroll it with 'fling' action, exception doesn't occur. So the exception arises only if application is installed and launched the first time.
Here is the adapter I use for the list:
CODE:................
Is there a way to avoid the exception? Should I catch the exception and escape the memory somehow?
I need to implement a list view with checkbox and each item should be associated with images.
View 1 Replies View RelatedIn my case i would be retrieving values from sqlite database and have to display it in a list view...So how should i pass the images out from the database into the list view.. I am able to save and retrieve images individually and display it on the screen.But how do i pass a bitmap and display it in a list view.can you help me with some sample codes please...
View 1 Replies View RelatedI am trying to modify this example:
http://developer.android.com/resources/tutorials/views/hello-gridview.html
But instead of displaying images that are resources, I want to display Drawables that I currently am storing in a List.
Can anyone instruct me on how I would modify
code...
To display my drawable items instead?
I'm an experienced C++/Java dev who has been truly enjoying that past two days of getting neck deep into the Android SDK. I can foresee a lot of sleepless nights ahead Now, being arrogant due to experience (lol) I basically wrote a hello world Activity, got it to work and promptly decided to write an out of process service with accompanying client for project #2. Android is so well thought out (if not exactly documented although that's an 'over time' issue inmho) that I had basically implented everything but callbacks into the client before realizing (and feeling like a total idiot) that there's a very nice example called RemoteService (lol @ me - again) Basically, this validated everything I'd been doing, although I did notice that because my client is in its own project and namespace and my service is in another project and namespace (but the same Eclipse workspace) that I had to have the service entry in my service's manifest AND my client's manifest (that one took me a while to figure out) in order to bind on the service. Anyhow, everything's great, I am starting to love on Android (figuratively) but I've run into <BRITISH-NESS>a bit of a sticky wicket, eh, wot?</BRITISH-NESS>.
When my client Activity binds on my service (which is running in its own process) and calls the equivalent of 'registerCallback', the interface is added perfectly to the RemoteCallbackList object and I can immediately (right on the next line of code) use the interface to send a notification to the client. Now, my problem is that when my main service thread tries to pull the interface out of the RemoteCallbackList via the broadcast methods, the RemoteCallbackList is always 'empty' - it returns 0 from beginBroadcast. After double checking ensure that I AM actually adding it to the list (because I've been a collossal idiot before) and that I am getting success back from 'register', I immediately think it's a threading issue, so: I add logging code to the service in key places to log what the thread id is repeatedly, and I think "uh, I think I need to use a handler of some sort to make the call back in the thread that handled the registration" and to double check I call beginBroadcast right after 'register' and find that it always returns back the correct number of callback interfaces. So it VERY much appears to be a threading issue (to me) so now I'm a bit stuck I've written a handler so that my main service thread can request the correct thread to actually call 'beginBroadcast' and then thought 'how is it going to know what thread that is...?' and instead am now thinking I need to pass, via a handler or something, the incoming interface from the thread that runs when the client calls the equivalent of 'registerCallback' to my main service thread. What part of the proper paradigm am I missing? BTW, as an example of the thread IDs, my main service thread is #1, the runnable I use for tasks in the main service thread shows an ID of #1, the message handler I was thinking I could use, shows an ID of #1, but the thread ID I get in my code in the service that runs when the user registers their callback is #7.
If I plan to notify clients when the service notices something it thinks they need to know, do I need to notify (somehow) the clients via the thread with ID #7 or do I need to pass the interface I get when the user registers their callback from thread #7 to thread #1 and call 'register' on the RemoteCallbackList from thread #1? Sorry for the verbosity but I figured more is better than less. Again, everything works great except this one little part.
here's what I want :-
An activity using Scrollable Tabs + Swipe - To display a predefined list of images.
This activity will be opened by a Listview activity, containing a list of Items that are really just the Names of the Images.
Corresponding to this list of Names of images are the URLs where these images are stored...
Names in one list , their URLs in another.
I want to obtain the list selection index from the listview activity, go to the activity displaying images and use that index to retrieve the URL and then display the image in it.
Does anyone else suffer from slow scrolling? For instance on the list of applications and on a large message thread the scrolling is very laggy and jerky. Surely this shouldn't happen with it's 1Ghz processor?
View 5 Replies View RelatedI am building a android aplication which will be consuming a json file from the internet. This json file contains a list of news from a particular website. Each json object contains information such like title, summary, descripition and web links for the news thumbnail and the original image.
I will be displaying in a listview three information: the news thumbnail, the title and the summary. Here resides my problem. I dont want to load all thumbnails from the internet if they wont be displayed. What I am trying to say is that why download a thumbnail from the 30th news if the user wont scroll down the image. So, i will, initially only download the thumnails from those news that are being displayed in the screen and when the user scrolls down to see more news, as soon as the list item appers to the screen i want to download the image and then display.
Is there a way to achieve this? Is it possible to find out if the list item is on the screen? I have been searching all over the internet for a solution for this but i am running out of ideas.
I'd found a way to see all of my text messages which had a "failed" status on them, and I was able to delete them from that list. But now I'm looking at my phone and for the life of me, I cannot figure out how to do it!
Basically, for one of my texting threads, there's a red triangle with an exclamation point icon, next to the paperclip icon for that thread. I'd really just like to know if there's a way to find the text responsible for this error so that the icon doesn't show up next to the contact's name anymore? I'm using an LG Lucid with Android version 4.0.4, and my guess is that probably since that update whatever option I'd used to find the failed texts has either moved or was taken out.
so when I go to my GALLERY on my Epic and select and image to SHARE, it shows a list of all my apps I can send it to, but since I have a lot I can't select my MESSAGES!? I want to send friends some images on mms!And when I turn it to landscape mode, the list is even shorter! It won't allow me to scroll through my apps to send the image.
View 3 Replies View RelatedHere 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...
View 2 Replies View RelatedI'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.
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.
View 3 Replies View RelatedDoes anybody have an example of lazy loading (about 10,000 items) an Android ListView from a Sqlite databse?
View 1 Replies View RelatedHow can I implement a run() method of thread if I create a Thread Global?
I mean If I create a Thread Globally then can I implement its run() method {" public void run()"} anywhere in my Application?
In the run() method I have to write the code to perform some action.
IF I can do it then please can anyone show me briefly how to do it particularly.