I have a list which is filled with a custom Array Adapter. I want to upload a progress bar every second, so i try to use notifyDataSetChanged in order to repaint the list but it doesn't seem to work.
View 1 Replies
Just watched Google IO's "World Of ListView" presentation [1]. Awesome stuff. I think every Android dev should watch it.
One gotcha for me was to use BaseAdapter.notifyDataSetChanged[2]. I checked code that I have written more than a year ago and found that I did try to use that, but commented it out with '// doesn't work' and I use requery() instead. That is of course much slower.
I now tried to find out why I wrote that it didn't work and hoped that I am meanwhile so much wiser that it would be easier to understand the proper use of the API. So much for ambition: The effect I see is that the list is not updated after I call notifyDataSetChanged(), but works with requery() and I am not so much wiser.
What could be the issue here? I use a ResourceCursorAdapter and only implemented the bindView() Method. This method is called when I call notifyDataSetChanged() on the RCAdapter. However the method is called with a cursor that contains the stale data.
Now there was a second gotcha from the presentation that I couldn't really place. It was said that the data should be committed on the GUI thread too (before calling notifyDataSetChanged()). I couldn't place it then, but I now suspect that this may be the issue here. So the rule would be to do the commit() on the Cursor on the UI thread? I do the updates to the database using a Service. This Service runs in the background, sometimes the app is in the foreground at the same time, but most often not. So I don't see how I should commit something in a UI thread? Is this the issue here? There are two different Cursors and I could only use notifyDataSetChanged when it would be the same cursor, otherwise requery() is correct?
Is that it? Any ideas? Is somebody going to write a book "The Android SDK - The missing manual"?
I'm trying to clean up some code and now I'm determined to get this seemless ListView updating working...
I want my ListView to be updated when I call notifyDataSetChanged() but nothing happens... I'm also passing the autoRequery flag to true when creating my CursorAdapter.
Cursor c = FavoritesHandler.getCategoryFavorites(getSQLiteInstance(), category); m_favoriteAdapter.changeCursor(c); startManagingCursor(c);
I'm trying to make my first widget that toggles the screen time out settings. Is there a way for the widget to be notified when Settings.System.SCREEN_OFF_TIMEOUT has been changed? I would like to know this so I can update the widget graphic accordingly.
View 3 Replies View RelatedI have ListView with adapter class which extends ArrayAdapter and implements SectionIndexer. The problem is section indexer is not updated when adapter data is changed. Even if i add new elements the section remain the same. I tried some options setFaseScrollEnabled(false); setFaseScrollEnabled(true); but i got IndexOutOfBounds exception. So how can i update sectionIndexer when adapter's data is changed.
View 2 Replies View RelatedI have a list view that can display items based on internal state (it has items, and 'viewed' items). i need to be able to toggle between the two states, i do that using a simple button that change the adapter's state and the adapter then called notifyDatasetChanged(). My data DOES gets updated, however i was facing two problems:
if in the previous mode the list was partially scrolled, it stayed in that state after i changed the data set (if i was half the way down i'll be half way down in the new data set as well, this is not the behavior i want, but i cols not find a way to scroll the list manually to position 0. any ideas?
(setSelected is not exactly a solution since i DON'T want any selection i want to stay in touch mode) In my list View each item has an image that is fetched from the net, as so it's being brought using my networking manager and i send the image request ONLY if i'm in this screen for the first time OR if scroll state is idlle, i didn't want to start loading images from the getView method since if i fling the screen it may load a lot of unnecessary images. However when calling notifyDatasetChanged() the scroll listener methods are not called. i solved this one by using notifyDatasetInvalidated even though my data is not empty, is there a better way to solve this issue ?
I have a list view that can display items based on internal state (it has items, and 'viewed' items). i need to be able to toggle between by two states, i do that using a simple button that change the adapter's state and the adapter then called notifyDatasetChanged(). My data DOES gets updated,
However i was facing two problems:
1. if in the previous mode the list was partially scrolled, it stayed in that state after i changed the data set (if i was half the way down i'll be half way down in the new data set as well, this is not the behavior i want, but i cols not find a way to scroll the list manually to position 0. any ideas ?
2. In my list View each item has an image that is fetched from the net, as so it's being brought using my networking manager and i send the image request ONLY if i'm in this screen for the first time OR if scroll state is idlle, i didn't want to start loading images from the getView method since if i fling the screen it may load a lot of unnecessary images. However when calling notifyDatasetChanged() the scroll listener methods are not called. i solved this one by using notifyDatasetInvalidated even though my data is not empty, is there a better way to solve this issue ?
I have written a TestSuite to find out how to calculate the rotation angles from the data you get in SensorEventListener.onSensorChanged(). I really hope you can complete my solution to help people who will have the same problems like me. Here is the code, i think you will understand it after reading it. Feel free to change it, the main idea was to implement several methods to send the orientation angles to the opengl view or any other target which would need it. method 1 to 4 are working, they are directly sending the rotationMatrix to the OpenGl view. method 6 works now too, but i have no explanation why the rotation has to be done y x z.. all other methods are not working or buggy and i hope someone knows to get them working. i think the best method would be method 5 if it would work, because it would be the easiest to understand but i'm not sure how efficient it is. the complete code isn't optimized so i recommend to not use it as it is in your project. Code...
View 1 Replies View RelatedAfter months of being really happy with 1.5, I ran with OTA 2.1 for about a week.... hated it! While I didn't see any outright bugs, the phone had hugely sluggish response, very poor battery life, etc. Finally decided to to the Factory Data Reset this morning, and voila - lovin' my Eris again.
Things to note:
Before Factory Data reset w/ 2.1 OTA:
- Phone uptime and awake time were almost equal (not good)
- Had the 50% without signal message
- 'Android System' always listed as top user of battery usage (60-70%)
- Even while idle, phone always felt 'warm' (like it was continually running a background process, as evidence by poor battery life)
After Factory Data reset w/ 2.1 OTA:
- Phone uptime and awake time now as expected (awaketime < uptime)
- No more 50% signal message
- Cell Standby and Phone Idle now top users of batter usage.
- Phone now cool to the touch while idle
One thing to note is even after the reset, I still had issues syncing Gmail contacts, and needed to delete the contacts cache.
While I won't conjecture about root cause, I'm hoping Google and VZ learn from this experience, as much of this mucking about is *way* beyond what most 'normal' users would put up with. My wife loves her iPhone and just laughs at me dealing with all this c**p. Besides, I can't remember the last time *she* had to reboot her phone..
I am generating the random numbers and do some functionality with that .but when i change the orientation new random numbers are coming.But I want portrait random numbers.For this give me some suggestions.
View 1 Replies View RelatedI'm crating tab view using this tutorial: Link<http://developer.android.com/resources/tutorials/views/hello-tabwidge...>. Now I need to reload tab content data when user view that tab. is there any way to notify ListAdapter ?
View 2 Replies View RelatedIs there any way to notify ListAdapter? Because i need to load Tab content data when user click in that Tab.
View 1 Replies View RelatedIs it possible to notify outgoing sms programmatically?
View 5 Replies View RelatedI am writing my own ContentProvider for my own application. And there is a ListView with a CursorAdapter pulling data from my Content Provider. My question is when there is a data change in my ContentProvider, how can I notify my CursorAdatper to requery the data and then have the ListView updated?
View 2 Replies View RelatedMy application has an IntentService which runs periodically to download data from a remote server. The download task is run inside an AsyncTask which has reference to Application context only. The data downloaded is for entire application and is displayed across four different activities. When the download completes(AsyncTask completes) the service is notified of the same. Now, the service needs to notify appropriate activity to update its view. The service is not aware of which Activity of what application is in foreground.
How do I make that connection? How does the service pass a message to the activity in foreground that new data is available and it should update its views?
I have an activity, it needs to response to a broadcast event.Since an activity can not be a broadcast receiver at the same time,I made a broadcast receiver.My question is: how can I notify the activity from the broadcast receiver?I believe this is a common situation, so is there a design pattern for this?
View 1 Replies View RelatedI have a problem handling messages in a Thread. My run-method looks like this The problem is that the run-method logs "id from message: null" though "message ID" has a value in the Log-statement. Why does the message "lose" it's data when being send to the thread? Has it something to do with the notify?
View 1 Replies View RelatedI have built an application that listen to call state changes, and I want to notify a service when the call_state became IDLE.All the components I have are functional, I just need to notify (not start) a service for this.What's the correct practice, maybe using AIDL? Because, in a PhoneStateListener, I can't bind to a service. Do I have to start an activity for that?
View 2 Replies View RelatedI am an android developer I have a problem..
I want to be get notified when the phone screen goes to sleep Help with a sample code.
My application has an IntentService which runs periodically to download data from a remote server. The download task is run inside an AsyncTask which has reference to Application context only.
The data downloaded is for entire application and is displayed across four different activities. When the download completes(AsyncTask completes) the service is notified of the same. Now, the service needs to notify appropriate activity to update its view. The service is not aware of which Activity of what application is in foreground.
How do I make that connection? How does the service pass a message to the activity in foreground that new data is available and it should update its views?
I need some help using ListActivity. The API provides "onListItemClick" which you can override and is called when user selects an item in the list.
However I want the same type of functionality when an item in the list is selected. So as soon as user highlights something in the list I want my application to do something (like play a preview). I dont want to wait for user to select the button.
If I put my phone on airplane mode, will it notify me of missed texts or calls after I turn airplane mode off?
View 4 Replies View RelatedI'm coming from .NET world, and unfortunately looking Java source with .NET's eyes. Following code is from Android Apps (though not Android specific at all):
private class Worker implements Runnable {
private final Object mLock = new Object();
private Looper mLooper;
Worker(String name) {
Thread t = new Thread(null, this, name);
t.start();
synchronized (mLock) {
while (mLooper == null) {....................
Is there a way to notify an activity/service of a force-close request right before it gets killed?
I mean when the user hits the force close button in Menu>Settings>Applications>Manage applications>app name>Force Close.
i remember on my touch pro with XDA, the market automaticly notified me about app updates as soon as they happen, and that hasn't happend once on my EVO i have had to manualy check everytime, i have the settings set to notify. is there something i am missing?
View 7 Replies View RelatedI have a background service application that get informations through a web service. This service has to alert the user when it gets some abnormal values. I also have a UI application that is used to display these informations. Finally, the only way I found to be able to get the service and the UI application to share these informations, was to create a third application that defines a custom ContentProvider . I've tried to define the ContentProvider in the service application to have only two applications, but it didn't worked. Everything is fine with three applications.
For CPU and battery saving reasons, the background service is refreshing the informations each 5 minutes. But, the UI application needs to refresh faster than 5 minutes. So, when the UI application starts, I need it to notify the background service to start refreshing at a much faster rate. And, obviously, when it closes, the background service needs to get back to the normal refresh rate.
My problem is that I don't know how to notify the background service from the UI application. I can set a field in the database when the UI application opens and closes, and check that field every second in the background service, but it will kill the CPU and the battery! How can I set some listener in the background service and send and event in the UI application. Can I define custom Broadcast events?
What is the best calendar app? Is there a calendar app or an addon app that will utilize the alarm in the phone to notify you of upcoming meetings? So far all i can find is ways to email or sms meeting warnings. The incoming sms doesn't get enough attention.
View 1 Replies View RelatedHow do I get my phone to notify me of a text while I am talking on the phone?
View 1 Replies View RelatedI was wondering if there is anyway to have facebook notify you when someone comments on your status or on a photo? I wouldn't see why google would leave this out, the only thing I see is settings for when people send you a message or a poke. If there is any way that you can turn on notifications..
View 17 Replies View RelatedWhenever I get a spam call I still get notified in the tool bar (with some of them it even rings once)...
So before I download any more apps, any App that doesn't notify you when a blocked number calls? Seems like an obvious thing, but they way these apps function seem to defeat the whole purpose of ignoring unwanted calls.