Android :: Turn Off Lazy Loading Of Listview
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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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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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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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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Sep 28, 2010
I want to dynamically load a ListView, for example, load them during the scrolling so its not loading all 100 posts I have. How can I achieve this?
I have looked at similiar solutions here at SO, but since I not got it to work, I asked this question.
My code:.............
I have in the same .java file, functions to download the info from the web and loop through 100 items, like this:
CODE:................
And then it add a new order correctly and so on. But now!(?) I want to have so when the first item is loaded, it should appear and when scrolling it loads gradually.
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Jan 19, 2010
I am wondering if which of the two is better in loading images in a listview from web, is it by batch through some number of threads that are running simultaneously or one by one through thread queue? I have noticed (but I don't know if that is really the implementation) from the youtube app that the images are loaded by batch and it is kinda fast. Even for not only loading images but also requesting some data from the web as well. Does anyone have an idea?
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Dec 7, 2009
In the android market app, the ListView shows a 'ProgressView' during the loading of the content of the ListView, and then when the loading is done, it shows the content of the ListView.
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Feb 19, 2010
I am using a custom adapter for my ListView as per the efficient adapter sample by Romain Guy. In the getView() method of my adapter I am assigning an ImageView a jpg image stored on SD using the following code...
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Apr 22, 2010
I am trying to laod the listview dynamically. There are three textviews inside a listview. The text to be set in the textview is fetched from the server. All this is working fine. I am able to fetch the text and am able to display it inside the listview.
The only problem is the position of the textview. The xml layout file is as under:
CODE:.............
If I look at this xml layout in the eclipse layout tab then it is displayed properly. Problem occurs only when the text is fetched dynamically.
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Jun 24, 2009
I have a listview that is populated by a couple threads that pull in data from the network. Before that data comes in, there are some default values displayed. When the screen loads, there are 6 items displayed, each with the default data. The 1st (index 0) loads and is updated on the screen, and then number 6 (index 5) is updated with that same info. Then, item 2 (index 1) loads, and then item 5 (index 4) mirrors that data. Then item 3 loads, then item 4 reloads with the correct data, then then item 5 with the correct data, then item 6. Why are items 5 and 6 briefly showing the data from other elements in the list? I can't figure out what in the world could be causing this.
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Jul 26, 2010
There are some others applications doing this, like Twitter, Facebook, or even native applications such as Android Market. When you want to display a list of items retrieved from the internet, this looks like a standard way for displaying the user some notification about action in progress. This is a white background screen with an animated spinning wheel and a "Loading..." text. Does somebody know how to do this?. I've been able to do something similar with this code, but i don't like it too much yet.
Still work in progress:
CODE:...............
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May 29, 2014
I am developing an application. In that application i have 2 list view (a and b ), i need to load the content of the list view (b) according with the selected value of first list view(a).How its possible.
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Feb 7, 2013
I'm pretty new to Android development and I just hit a brick wall in the development of an app, I'm currently working on.
The problem is that I have a list of locations (states), and when one is selected, a list of cities from that state is loaded via http request and JSON and then is supposed to be inserted into a listview in another activity.
So now I have the StateList activity and the CityList activity. Currently, the statelist activity starts the citylist activity via an intent and gives it a state name. Then, the citylist activity uses that name and requests data from a server via AsyncTask. As result I get an array of City objects, which are supposed to be inserted into an adapter for a listview.
Now begins my problem: I don't want the second activity to show up before all data is loaded. I also don't want the first activity to do the request and then have to transfer the whole result to the second activity using intent extras.
So what would I have to do now to have the second activity load all the data and only then really show up? I tried only setting the content view after receiving the data, but since the base class onCreate() is tied to some manipulation of the layout, I would also have to call onCreate() at that point, which is not allowed.
Here some code snippets of what I tried already:
The onCreate() method of my second activity (which is supposed to hide):
[high]protected void onCreate(Bundle savedInstanceState) {
requestWindowFeature(Window.FEATURE_NO_TITLE);
// send request for citylist data
CitylistRequest request = new CitylistRequest(this, new State(0, getIntent().getExtras().getString("state")));
request.execute();
[Code]...
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Apr 22, 2010
CODE:...................
This is the layout that I am inflating in the Adapter. Everything is displayed, but only the second textview which should be displayed at the bottom is getting displayed at the top. Can someone let me know the problem with this?
I I view this in the layout tab in Eclipse then it displays properly. The problem occurs only when the text is fetched dynamically.
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Aug 10, 2010
I tried the new speed fix and suddenly all my apps stopped loading. so i rebooted, now it got stuck on galaxy s screen and wont turn on. after waiting i got a black screen and the buttons are lit up
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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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Aug 16, 2010
I have a ListView in my app that has a background image. All of the rows are a semi transparent white (#35FFFFFF). Whenever I scroll the list, the rows turn a light green that obscures the background image until I stop scrolling (usually--sort of unpredictable). Sometimes it flickers between the background image/color and the green. And yes, I have set the cache color hint to #00000000. Any advice about this would be appreciated.
ListView xml:
<ListView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="7px"
android:cacheColorHint="#00000000"..............
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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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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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Jun 26, 2010
I would like to change text and back ground color of my Listview without building custom rows. Is this possible ?
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Jun 24, 2009
There must be a way to do this. How can you tell a ListView that has a header to not scroll it when the user scrolls the contents? I want it to stay in a "stuck" position so that the user can always see what column the content applies to.
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Jul 28, 2010
I am trying to pass location data from my application to the Google Navigation API (No, not the browser). I can pass data to the dialer, and call a phone number successfully, but now wish to use the turn-by-turn navigation as an additional function. I have searched tirelessly through Android documentation, Google Maps API Documentation, and the web without luck.Can anyone point me in the right direction or hint how I can pass the service my data?
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Jul 13, 2009
Dear Android community, i've a license/legal question regarding asking Google directions to be drawn directly into the MapView. Some of you know that asking google http://maps.google.com/maps/nav will give directions in Json + a Polyline encoded form.What i would like to know is, where is the Terms of Service regarding this functionality? It is for Google internal use or not? There's also the KML which gives similar informations. Please note that it is NOT for real time driving directions but a path to be drawn from a point to another and your position NOT refreshed in real time and of course it is for an app downloadable free of charge.
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Sep 18, 2010
Frustrating - but apparently the capability is I can customize a route online with Google Maps, save it to my maps and send it to the phone but it sends the static map.Ridiculously, all this power and I can't take those directions from the PC and turn them into turn by turn directions on the phone.
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