Android :: What Is An Adapter And How To Use It?
Nov 21, 2010Could you please let me know what is an adapter and how can i use it? It seems to be powerful stuff.
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Android :: Generic Adapter
Jul 29, 2009Generic android.widget.Adapter iface has getCount() method which tells e.g. ListView how many items adapter has. what if my Adapter's data source cannot tell me it's size and has only method Object getItem(int position) returning e.g. null when there is no item for that position? in other words i can get some object at given position but don't know maximum value for position so, is it possible to create Adapter not knowing apriori its size?
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Sep 12, 2009I am developing file browser to my media player UI i have written in my OnItemClickListener() in that i called the method like adapter.notifyDataSetInvalidated() method but it is not working please help me to refresh my list.based on onItemClickListener() method.
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Jun 30, 2010I'm switching over from Windows Mobile and I am a big user of WMWifiRouter. I know there are some Android apps for tethering, but there is a feature of WMWifiRouter that allows me to connect USB to WiFi and enable my phone to be used as a WiFi adapter. Is there such an app for Android? Thanks in advance!
View 7 Replies View RelatedAndroid :: Id Column In List Adapter
Feb 2, 2009I am trying to use a list adapter. While querying, i need to have a column called "_id" which helps to scroll through the database. I have an other primary key in this table. Can I use a custom column name, or am i bound to the "_id" column.
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Nov 15, 2010I have a custom layout with a lot of Views. Currently, I build the entire view hierarchy in the on Create, though I stream the actual work in small batches. This works OK up to about 1000 Views and then performance degrades a little. Obviously, I'd like to use the List Adapter pattern and only generate the parts of the View hierarchy that are visible on the screen. My parent View, however, is not (and cannot be) any of the existing List View types. My question, then, is how do the List View types interact with a List Adapter to limit the number of Views necessary to represent a big list? More broadly, is there a pattern out there for extending a Linear Layout to create special List Views?
View 4 Replies View RelatedAndroid :: Adapter With Section Headings
Nov 19, 2010I have a custom adapter to display a list of items with section headings. I've looked at Jeff Sharkey's SeparatedListAdapter and CommonsWare's MergeAdapter as examples of how to achieve this, and I now have a solution which works by providing a separate adapter for the content of each section. This creates a big performance problem, though. In my case, there are potentially thousands of items in the list, each with an associated date, and I want to use the date as section heading for all the items with that date. So, without section headings, I'd have a single Cursor which returns the items sorted by date. Nice and easy. With section headings, I'm currently doing this: One Cursor to select all distinct dates in the dataset. For each distinct date, a separate Cursor to return the items matching that date. Pour the dates (section headings) and separate SimpleCursorAdapters for each date's items, into my custom adapter.
View 1 Replies View RelatedAndroid :: Looking For (RCA Audio Inputs) Adapter
Mar 2, 2010My stereo system (Phillips MCM530 Micro System) has RCA audio inputs. I want to be able to play music from my G1 through the stereo. I'm wondering if either of these is what I should be using.
USB Virtual 5.1 Channel Sound Adapter with MIC Input USBG-SV5 LOW PRICE $19.98
USB 2.0 AUDIO Input/Output Sound Card for XP and Vista USBG-X2X LOW PRICE $17.88
USB Input/Output with LINE-IN Sound Card for Windows USBG-X4S LOW PRICE $28.88
Android :: Custom Adapter - How To Set Row Height?
Jan 31, 2010How do I set row height if text of some rows more than one line when writing custom ArrayAdapter?
View 4 Replies View RelatedAndroid :: Need To Have Complex ListView Adapter
May 18, 2009I have ListActivity to show a custom list. The adapter for this list is a complex layout only known for each row at runtime depending on data gathered in a previous activity. The question I have is simple. I know it takes 4-6 seconds to prepare the adapter for the rows that will be visible (first 10), however I would like to let the user know by means of the empty list functionality or otherwise. At present the ListActivity is launched via a button on a previous activity and when that button is clicked the new activity will not be loaded until the adapter is completed, and the user is stuck with the previous activity until this happens. Code...
View 5 Replies View RelatedAndroid :: Custom Adapter With Bar Progress
Feb 25, 2010I have a custom adapter for an arraylist.
CODE:...........
But when i try to access to the progress bar in the adapter
CODE:............
It always return null, like it doesn't find the progress bar. However, the progress bar is shown in the list, but i need to access to it inside the adapter.
Android :: An IF Statement In A Cursor Adapter?
Jul 15, 2010CODE:...........................
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Jun 7, 2010I seem to be having trouble with the linkify I am using in my Custom Adapter. For some reason I recieve the following stack track when I click on one of the links:
CODE:......
Here is the code that is calling it:
CODE:.......
I understand what the error is saying but I am not sure how to fix it.
Android : Looking For Sync Adapter - Api Level 3 & 4?
Jul 30, 2010I'm looking at the sample sync adapter here:
http://developer.android.com/resources/samples/SampleSyncAdapter/inde...
I'd like to still support sdk level 3 and 4 devices. Will including the following lines in my app's manifest be problematic?: are these specific to sdk level 5?
Ideally, we could include these for level 3 and 4 users, and they just won't be shown the contact sync option at all. Is this how it's meant to work?
Android :: When Using The - Efficient Adapter - Holder Is Sometimes Null
Aug 22, 2010I'm using a mixture of the "Efficient Adapter" and the EndlessAdapter from CommonsGuy, and sometime the holder in getView() is null.
CODE:.............
I've put the rest of the code for both of my classes here, as it's rather large to paste inline.
Once the whole data set is loaded, scrolling up & down causes rows to disappear and re-appear too.
Android :: Load ListPreference Items From Adapter?
May 29, 2010I'm setting out to create a settings activity for my app. I've defined a PreferenceActivity with a nice layout including a ListPreference object for the user to select a bluetooth device. I'm having trouble dynamically populating the list. I would like to populate ListPreference with values from an array adapter (which I'll create and populate with relevant bluetooth device names). If this were a spinner View, I could just call setAdapter(). However with the ListPreference object I can't figure out how to attach an adapter (findviewByID won't cast from View To ListPreference, so I can't even get a handle to the object). I would like to attach an adapter and then populate the adapter with values, which in turn would populate the ListPreference with values.
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Aug 28, 2009How i get the Selected item from the list Adapter.In this above code if i selected March from the Dropdown Adapter means then how can i retrieve the Manth March to show in a textview.
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Mar 1, 2010I have an ArrayAdapter (myAdapter) attached to an AutoCompleteTextView (textView)component. Once the user presses a character I would like to populate AutoCompleteTextView's drop down list with items containing this character. I retrieve the items using AsyncTask (which uses a web service).
I call myAdapter.add(item) but the drop down list is empty.I added a call myAdapter.getCount() after each addition and it shows zero every time.
Calling notifyDataSetChanged() didn't help.I even tried to add simple String objects instead of my custom objects, to no avail.What am I doing wrong?
Edit: I changed the code as miette suggested below but still to no avail.
Generally, what I do is after text is changed in my auto complete text view, I call a new AsyncTask and pass it the entered text and a Handler (see afterTextChanged()). The task retrieves objects relevant to the text and once done the Handler's handleMessage() is called. In handleMessage() I attempt to populate the adapter's objects. But still the adapter's drop down list ends up empty.
Here is my code:
public class AddStockView extends Activity implements OnClickListener, OnItemClickListener, TextWatcher {
ArrayAdapter<Stock> adapter;
AutoCompleteTextView textView;
Vector<Stock> stocks;
public AddStockView() {
// TODO Auto-generated constructor stub
stocks = new Vector<Stock>();}
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.add_stock_view);
findViewById(R.id.abort_button).setOnClickListener(this);
adapter = new ArrayAdapter<Stock>(this,
android.R.layout.simple_dropdown_item_1line, stocks);
//adapter.setNotifyOnChange(true);
textView = (AutoCompleteTextView)
findViewById(R.id.search_edit_text);
textView.setAdapter(adapter);
textView.setOnItemClickListener(this);
textView.addTextChangedListener(this);} Code...
Android :: Get A String From And SD Card Into A List Adapter?
Nov 5, 2010I have been playing around with a LazyList code sample which is pretty neat for displaying images in a safe and non-memory-hogging way. It uses a very simple mechanism of displaying images based on a list that exists within the class file.
Example:
CODE:...........
I am trying to load these values from an index file that is downloaded to the SD card, and then loaded from it. Here is the code that loads the index file and simply displays it as a Toast message (this works fine).
PULL FILE FROM SD CARD
CODE:.........
What I am struggling with is how to take this string that is being loaded from the SD card and pass it into the list adapter.
The code presently looks like this:
CODE:................
I am trying to reload or refresh that same adapter using the values I pulled from the SD card file, presently called "readString".
Can anyone give me some pointers? I am leaving out the code that I created that doesn't work ... because I don't think I am handling this at all correctly. Also - go easy on my, I am a complete newbie to all of this. :-)
Here is my what I am trying to do. Simply copy and paste the working code where I want it. I know it's not that simple, but I am having a hard time reconstructing it properly. Here is my edited code ...
PULL FILE FROM CARD ATTEMPT #2
CODE:..........
The error that I get on "adapter=new LazyAdapter(this, readString);" is "The constructor LazyAdapter(new View.OnClickListener(){}, String) is undefined".
Having not shared the contents of LazyAdapter, that information may not be helpful. So here is the LazyAdapter class in it's entirety ...
CODE:.........................
Android :: How To Call NotifyDataSetChanged() From A Generic Adapter
May 19, 2010An OnItemClickListener for a ListView has the following method:
CODE:.......
I'd like to have the adapter behind the ListView refresh, and I believe this is done through the use of:
CODE:.........
How do I use the parent parameter in the onItemClick method to do this? So far I've tried:
CODE:.................
This throws an error because the object returned is of class HeaderViewListAdapter, which for reasons unknown isn't a subclass of BaseAdapter.
Android :: IllegalStateException When Adapter.notifyDataSetChanged() Is Called
May 27, 2010I have a very simple application. There is a refresh button, everytime it is being clicked, the adapter will call notifyDataSetChanged() to update a ListView. However, I got IllegalStateException all the time.
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Aug 4, 2010Is there a way to attach dynamic adapter to EditText?
What I want is - when a key is pressed on EditText, my code to do a search in (some) custom store and provide suggestions (instead of static Xml-list or array). This store is not a database; I think CursorAdapter is for database results only. Example code snippets are welcomed.
Android :: Cursor Adapter With Multi Select
Nov 11, 2010I've written an APP the uses has a small SQL lite DB and using a cursor adapter I can retrieve the records and populate a list view with them. from there I can get the Id of a selected item and delete it from the DB which works great. the issue I have is that as the DB grows deleting one row at a time would be slow and frustrating so I wanted to know if there was any way to allow multiple selections possibly with check boxes or by even changing the text color of the items selected so that I can retreiving their relative ID's.
I have read some posts that talk about custom cursor adapters but I am not sure how to adapt them to my code.
I have posted my code below.
CODE:.........................
Android :: ItermId To Position In A ListView/Adapter
Jan 7, 2010In a ListView/CursorAdapter, it is easy to go from a position to an itemId
CODE:..........
Is there any way to do the reverse mapping? From an itemId, get its position in the list?
Android :: Custom View Using Adapter Iface
Jan 31, 2009I want to create custom View showing possibly several items. i think using Adapter interface would be good idea.
My question is: should i extend AdapterView? if so, what is the most imortant when doing this (e.g. AdapterView is ViewGroup, so how should i manage children)?
Android :: Cannot Understand NullPointerException With Custom Adapter
Apr 28, 2010I am trying to create a list view which as TextView that can display html content , an WebView and other basic TextViews.I tried to extend SimpleAdapter but i struck with the problem ,I will be glad if someone can point out the mistake i am doing.
In onCreate method:
CODE:.............
And my row.xml file looks like:
CODE:.............
The error i was getting was:
CODE:..................................
Android :: Janky Custom Cursor Adapter
May 25, 2010I have a Custom Cursor Adapter. It shows a list of installed applications with an icon, name and checkbox on each line item. I cache the list of applications in a database for faster retrieve and to store the state of the checkbox. However, I can't store the application icon in the db because sqlite doesn't support blobs. They list works rather well except that it is "janky" as described by Brad Fitzpatrick at Google IO (https://wave.google.com/wave/waveref/ googlewave.com/w+3kgmObZwO ). I'm trying to make my app non-janky by following the tutorial here: [url]... but I'm having trouble.
The reason my list is janky is because I look up each icon as you scroll down the list. drawable = pm.getApplicationIcon(c.getString(c.getColumnIndex(SmartLockDbAdapter.KEY_PACKAGE)));
getApplicationIcon takes too long to return to make for a smooth scrolling list. I would like to perform the action in the background with an AsyncTask but because bindView gets called repeatedly in a short time span, my icons end up with the wrong list item. I need help.
I've posted my whole ListActivity below in hopes that it helps other people. It's much harder to find an example of a working CursorAdapter then it is an ArrayAdapter.
CODE:........................
Android : Leaking Bitmaps From Adapter's GetView
Mar 31, 2009I definitely have a memory leak problem and i'm trying to figure out there. After 6-10 config changes i'm getting out of memory in regards to BitmapFactory. I'm kind of suspect that this is going on within adapter. I have a listview . ListItems are an thumbnail image ( ImageView ) and TextView for text.
Here is the getView code.
CODE:..................
And get ThumbnailBitmap() is basically BitmapFactory.decodeByteArray ..
Is it possible that i'm leaking drawables ? Heap is not increasing by the way .
Android : ListView Adapter Illegal StateException
Mar 30, 2010I've implemented a custom ListView and Adapter, and sometimes I receive IllegalStateException exception:" ERROR/AndroidRuntime(3575): java.lang.IllegalStateException: The content of the adapter has changed but ListView did not receive a notification. Make sure the content of your adapter is not modified from a background thread, but only from the UI thread."
Here is some code example: Code...
Android :: Scrollbar In Adapter View Derived Object
Jan 11, 2010I have a Adapter View derived class (say GridLayout) in which I arrange views in a grid. When items in the grid exceed the height of the GridLayout( or screen) I want a scrollbar to appear. I have handled scrolling in onTouchEvent. But the problem is the scrollbars don't appear. I have set the vertical scrollbar to be enabled, but no use. The docs say the scrollbar appears every time the scrollTo or scrollBy methods are called.
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