Android :: Default Number Of Views Constructed For A BaseAdapter?
Jun 26, 2009
I've tried to describe this problem a few times, but I'll try again.I have a thread (not spawned from the adapter) which updates items in a List that a BaseAdapter child uses to populate its view. I am not adding things in the List from the thread, just modifying content. In any case, I have 6 rows visible at first on the screen. The thread pulls data from the network and updates them in 0, 1, 2, 3, 4, 5 order. However, when 0 is updated, 5 mirrors its data on the screen briefly, then 1 is updated, 4 mirrors it, 3 is updated, then 4 is reloaded correctly, then 5, then 6. I am using the view holder/ convertView pattern correctly, as far as I can tell.How many views are created by default for an adapter? My guess is 3 based on what I see. Then, when getView() gets to index 4, 5, or 6, it correctly creates more Views and populates the right data. Anyone ever seen anything like this?
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Apr 9, 2009
When ever I try to animate a view using a simple xml based animation, it seems to have default interpolator set of some kind as the motion is not truly linear.
Is there a way to set the default animation interpolator to linear and remove the lag in the start/end of the animation.
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Jan 6, 2010
I have a simple ListView and on that ListView I have placed a number of custom defined Views. The CustomView has ImageView and two TextViews.
The CustomView also has a "stateful drawable" as background, so that the background image (a 9-patch) changes if you press the Row in the ListView. When pressing the Row, the background image changes to a Red-ish thing.
The problem is that when the background changes from the default greyish, all the Views in the CustomView (ImageView and TextViews) still have their greyish background and thus creates very ugly greay boxes on top of the now redish background.
What is the best way to solve that problem? I hoped that such things were handled automatically (as it is done in for example .NET), but I was wrong it seems.
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Aug 10, 2012
In several of the tutorials I've gone through, the following syntax is used:
Code:
Handler handler = new Handler()
{
@Override
public void handleMessage(Message msg)
{
//do stuff
}
}
1) What is this achieving? Is this allowing you to override one particular method for only THAT instance that you've just created, without needing to extend the entire class?
2) What is this syntax best called or described as? I tried Googling for stuff like, "declare method inside new instance" and such, and got nothing.
3) Are there any best practices/potholes that I should be aware of in using this? (e.g. "it's generally discouraged", etc.)
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Jan 10, 2010
So, I selected "remember this" when I was sending a text to a contact, because it was the mobile number. Turns out, that set the number as "default" for the contact and now I no longer get to choose which number to use when calling. How can I got back to not having a "default" number?
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Jul 14, 2010
I have started the default SMS application and specified the SMS text to be sent through following code- intent = new Intent(Intent.ACTION_VIEW, Uri.parse("sms:")); intent.putExtra("sms_body", "SMS Text"); startActivity(intent);It worked fine and sends the message to selected number from contact list.My requirement is that i want to know the number to which my SMS was sent?
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Nov 16, 2010
I am implementing a music player application in Android. My play list selection screen is implemented as a tab selector widget which contains a ListActivity inside each of the tabs: Artist, Albums, Songs.
I want to update the ListView in each of the ListActivity when I delete an item from any of the lists.
i.e. When I long press an item in the Artists list a context menu is drawn with "Delete Artist"
And it should delete all the songs from this artist in the Songs ListView, delete all the albums by this artist in the Albums ListView, and finally delete the entry for the artist in the Artist ListView.
Each of the ListActivity has its own fillData() method, which updates the ListView when the button in the context menu is pressed.
How can I call the fillData() method of the Albums ListActivity after I update the ListView inside of the Artists ListActivity?
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Feb 28, 2010
I want to populate a table, defined in layout xml file through the programmatic way. I have define Table with a single row defining its header, with all the attributes set. Now i want to know a way so that i can just replicate that header row in the table with new content.
I tried using inflator inflate(int,view) method, but at runtime it showed up with error.
Here is the XML code for the layout file defining the table
CODE:.................
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Aug 24, 2010
Before I knew better I looked at the default voicemail number and said "well that's not my number." and promptly changed it. Does anyone know what the default number should be? Is it the same for all phones or should I take it to the ATT store and have them fix it? Will a factory reset solve my problems?
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May 13, 2010
When I first got the phone, I incorrectly set the number then reset it soon after. It seems to default back to that first wrong number. Am using the HTC Hero on 3 (UK) network - every now and again it decides to lose or update the voicemail number it dials when I press and hold the #1 key. Have reset it more times than I care to remember.
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Jun 10, 2010
Is there a way to do this?? I find it ridiculous that home, work, fax, emails, and all other categories come up as "suggestions" when trying to text. Is there a way to set "mobile" number as a default?
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Mar 6, 2010
I have the following XML code:.................
The idea is to change the views, whenever I press one of the radio buttons. When I press a button the first time everything works out fine, but the second time I press a button, I get an IllegalStateException, and I can't quite see why I'm getting this.
Also, the Activity seems to set all my global variables to null, which is why I have to create them every time I switch from portrait to landscape or vice versa. So I would like to know if there is a way I can save my views in the Bundle, or any other way in which I can permanently save my views, so I don't have to add or create them every time, I flip the phone. And whenever I flip the phone, it seems that it rereads the main XML file, causing the RadioGroup to be set to 2D even if the 3D button is checked. This is because I've said the 2D button to be checked from when the app is first created, but I would like to also save the state of that RadioGroup.
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Sep 6, 2009
How does BaseAdapter communicate with its ListView? I was wondering how the BaseAdapter.notifyDataSetChanged() method notifies the attached View that the underlying data has been changed and it should refresh itself? When creating a BaseAdapter you attach it to the View with.So the ListView then knows it's adapter to get list elements. But you never tell the BaseAdapter what ListView it is attached to. So when you call BaseAdapter.notifyDataSetChanged() how does it reach the View to tell it to refresh itself?
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Nov 19, 2009
For Google about BaseAdapter class
In Android 1.6 and 2.0 the BaseAdapter class has apparently been modified to throw an exception when it sees the Adapter.getCount() method return a number different than what it picked up when BaseAdapter.notifyDataSetChanged() was called (at least I did not observe this behavior in pre 1.6).
So now the question is, when should one call notifyDataSetChanged() or more importantly, when can the count in the Adapter be safely changed?
Consider the case of an app with a background thread delivering data to a BaseAdapter at a rate faster than the ListView responds to notifyDataSetChanged(). Because notifyDataSetChanged() is a synchronous call and the ListView updates are taking place sometime in the indeterminate future on the UI thread, how can an app know when it is safe to change the adapter count?
If the app changes the count while the ListView is updating itself the exception will be thrown (and there is no way to catch the exception).
Is there a way to know when it is safe to change the count in the BaseAdapter?
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Mar 9, 2010
I am using BaseAdapter for displaying the list. This list is fetched by calling a Web Service. At a time only 20 records are returned. Now, when the scroll of the BaseAdapter reaches the last record then the application should fetch more records from the server.
So, what I want to know is how to know the scroll position or some other way of knowing that the last record has been reached so fetch more records from the server. I don't want to implement the next and previous button on the screen.and so am trying to implement it in this manner.
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Jul 27, 2010
Can anyone with a Vibrant change their voicemail number in settings->call settings->voicemail->voicemail? I'd like to change it so when I speed dial 1 it goes to google voice. I called TM and they said I should be able to change that setting. I installed a new SIM, and I removed TM's visual voice mail. Out of ideas here. I'd at least like to know if it's like this on all Vibrants or just some Vibrants.
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Nov 12, 2010
Lots of my contacts - especially my "favorite" contacts - have multiple phone #'s, which is pretty typical. So it's a nice feature in the dialer that lets you select a specific number - home, office, mobile, etc., to dial every time you pull up the favorites tab within the dialer screen. I by mistake checked "use as default number" for one particular contact, but now I want to deactivate that selection and have no default number for that particular contact.
I know how to switch the default number from one to another; is there a way to deactivate the default number and just have the phone ask me which number to dial, e.g. home, office, mobile, etc.? I've been trying to tinker with everything I can to no avail, and I've also been shut out trying to answer this question online. Only thing I haven't done is call Verizon.
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Jun 2, 2010
Is it possible to change the default number for all your contacts to Mobile instead of Home? Slightly arduous to change them all over.
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May 7, 2010
I actually noticed this on V2 leak as well when I set up my favorites list, and then select that person for the first time, I'm prompted to set up a default action - that default is never saved, and I have to repeat those steps in order to dial a number - anyone have this problem? Is there a step I'm missing?
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May 31, 2010
Since the 2.1 OTA, I noticed in my contacts that it shows ALL phone numbers as numbers to send messages to.Previously, message numbers were all set to just the mobile numbers. I don't see any easy way to fix this.
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Jun 16, 2010
How do you align views relative to the "middle" part of another view? I think it is best explained with a pic of the UI I'm trying to create in android.
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Nov 22, 2010
In my android application I have custom listview with an image and textview. In extended BaseAdapter under getView method click events of textview and image are associated with onClick method using setOnClickListener as shown in code below
CODE:.............
And
CODE:...................
When clicking on image it acutally deletes that entry from List which works fine, but on clicking textview i would like to return the text of clicked textview to main activity but I am unable to achieve this, although I can do this from setOnItemClickListener of this custom listview acitivity.
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Oct 12, 2010
I have Parsed the Json Response and Now I want to use the BaseAdapter Class in my Application. I have a rough Idea about the BaseAdapter Class but not very clear about the same. what exactly the Base Class does.
Also do I need to use the Getter and Setter Methods if I am using the BaseAdapter Class in my Application?
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Feb 22, 2009
In a list, is it possible to have different kind of views, inflated from different layout XML?
I started with the sample in the API Demo, using the Efficient Adapter, and it starts like this Code...
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Dec 17, 2009
I custom the BaseAdapter to show image array with full-screen mode. I want the user can flick the images so I use the gallery class.When a image displays on the screen, a correlative sentence should be showed as well. The issue is the position param in getView function jump abnormally, especially when I flick into more one picture at a time. Therefore the string is showed incorrectly, I don't know why the image still displays normally. Here is my code...
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Jul 29, 2010
I have a little problem. I have class
CODE:..............
When I do that, method convertView.setBackgroundColor(Color.RED) work great, what I need Image is there:
dl.dropbox.com/u/866867/stack/device2.png
But when I want to remove that item, I can't do it. I add there convertView.setVisibility(View.GONE); , but have empty item, beside hide it. I read that parameter View.INVISIBLE won't hide layout, but View.GONE have, but in my code, doesn't.
And that image: http://dl.dropbox.com/u/866867/stack/device.png
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Jan 25, 2010
Is there any way to query a root view of an activity for all of its child views even before the root view or its children have been inflated? I guess what I'm looking for is whether a view knows ahead of time what children it will have before it gets inflated, and can I get that list in some way. Bizarre I realize, but I think it will help me with some unconventional automation testing I'm working on. I haven't found anything in the API like this.
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Jun 25, 2010
Is the Droid X is constructed out of anodized aluminum or hard plastic? Hard to tell from pictures, and I haven't found any official data on this.I'm hoping for a nice aluminum build like the Nokia N8/Moto Devour/ Original Droid, but even if it is a hard plastic, at least it's a matte finish which is superior to the "finger print magnet" finish of its rival EVO 4G.
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Feb 16, 2010
I'm trying to get my first Android app stable enough for the marketplace, and I've hit a brick wall with one exception that I don't understand. Probably I'm doing something stupid, but I can't tell what, and after several hours googling and experimenting, I thought I'd see if I can get some help. My Activity extends ListActivity, and the parts I think are most important are extracted below:
GroupedListAdapter is a simple class that extends BasedAdapter to provide headings for sections of the list (not unlike the Fancy ListView tutorials that are floating around).
I create this in onCreate, and it works fine. Inside onListItemClick, I do some actions which will create a different set of list contents. I "clear" the adapter, which empties the contents, and call reload, which repopulates it. Then I call notifyDataSetChanged.
Most often, this seems to work, but also fairly often, I get the exception following the code snippets below - this seems to indicate the ListView is not in sync with my changes. Lately this crash happens 100% of the time under the simulator.
CODE:.........................
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Mar 23, 2010
Data being pulled from a local DB, then mapped using a cursor. Custom Adapter displays data similar to a ListView. As items are added/deleted from the DB, the adapter is supposed to refresh. The solution attempted below crashes the application at launch.
CODE:................
Errors:
CODE:.........................
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