Android :: SimpleCursorAdapter.bindView - And Row Views

Oct 22, 2009

I have a problem with bindView() that has me puzzled. I am using it to customize each row, including setting icons, coloring the background and setting up listeners for buttons. It mostly works as expected, but not quite.

When I fill the ListView with SimpleCursorAdapter, I get multiple calls to bindView() for position 0, but only 1 call for the other rows. The problem is that when all is said and done, I have 2 rows (LinearLayout) created for position 0. Here is a sample log extract:

CODE:........

I use a view holder class to hold the view, position and other data so that when a button is clicked, I can retrieve the holder with view.getParent.getTag(). This all works fine. The problem is that there are two views for position 0, but it's the first one in the above logcat that seems to be displayed. My code which acts on the rows when a button is clicked (especially setting background color) does not reliably hit the position 0 row that is actually displayed.

I can see what's happening but I am at a loss about what to do about it. Why are two view created for position 0? Is it something that I can control? How? If not, how should I deal with it so that the results when I modify the views are predictable?

Android :: SimpleCursorAdapter.bindView - and Row Views


Android :: Overrided SimpleCursorAdapter BindView Not Being Called

Mar 19, 2010

The problem is as follows: - My app is deriving from TabActivity that has 3 tabs - Each tab has a ListView - Tab1 is populated by an adapter that inherit SimpleCursorAdapter and overrided the bindView() method. This tab is displaying correctly. - Tab 2 is also populated by another adatper that inherit SimpleCursorAdapter and overrided the bindView() method. For some reason that I don't understand, the overrided bindView() is not being called. Thus the tab is not displaying correctly.

Here's my code fragment:

CODE:...........................

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Android :: Views And Their Child Views - How To Avoid The Ugly - Boxes - When Child Views In A View Has Another Color Than Background

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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Android :: Using BindView To Customize ListView

Feb 7, 2009

In all the examples I've found to manipulate each view in a ListView, the method always seems to be getView(). But these were never Adapters backed by a cursor. I decided to try bindView() within a SimpleCursorAdapter, and so far it works very nicely, especially with the cursor all set up for my use.

My question is, is this usage good practice, and could I run into a problem in future? My question may be dumb but I just couldn't find a good example code snippet that uses a cursor.

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Android :: Multiple Calls To SimpleCursorAdapater#bindView

Oct 3, 2010

I am using setViewValue method of ShowViewBinder to access image inside row of listView. The idea is to load image from internet and display it inside row of listView.

To load image, I am starting new image loader thread, but what I discovered when debugging this code, for each row I am actually starting 3 or 4 threads. I don't understand why. The code in if (columnIndex == ...) is executing more than once.

My code goes something like this:

CODE:...................

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Android :: GetView Vs BindView In A Custom CursorAdapter

Aug 20, 2010

I'm watching this video http://www.youtube.com/watch?v=N6YdwzAvwOA and Romain Guy is showing how to make more efficient UI adapter code using the getView() method. Does this apply to CursorAdapters as well? I'm currently using bindView() and newView() for my custom cursor adapters. Should I be using getView instead?

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Android :: CursorAdapter Calling BindView On Every Item

Oct 4, 2010

I was using some of the code from DeskClock and found that when I tried to modify the CursorAdapter that newView was getting called for each item. (I actually wanted to add a divider and it seems like adding the dividers separately is better than adding them into a single listView)

If I have 3 items I get the following behavior:

CODE:.............

I would've expected newView/bindView to be called once per cursor item. But, that doesn't seem to be the case. This was kind of a problem for me because I wanted to select the appropriate view depending on the cursor data, but since bindView could be called before newView that doesn't work.

Is this some odd recycler behavior (or somehow normal/expected)? Or is there something broken with the code (I removed everything except the ListView and it's still doing this)? I'm not quite sure why you would try to bind views that haven't been created, and why newView gets called on the first item twice.

If someone has an easy way of adding dividers to ListViews I'd love to know. I was going to try to dig through the contacts example to see how they did it there if not.

In case anyone's wondering MergeAdapter was neat to mess around with and try (I'll use it in some other situations). But, I did just end up writing a single adapter that handles multiple views. It computes the type of each item (which is small), stores it in a map, initializes it at adapter creation, and updates it in notifyDataSetChanged.

Then you just need to have getViewTypeCount() return the number of possible views. And getItemViewType to return the type from the map (which is 0 based, so 0-getViewTypeCount()). If you can compute your type from the position you don't need the map, but doing this on the fly wasn't possible so I just pre/recompute when needed.

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Android :: How Can Update The All The Views Inside A TabHost When Pressing On A ContextMenu Item From Within One Of The Views

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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Android :: How To Make Use Of Views Defined In Layout XML File As Template To Create Views Programmatic Way

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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Android :: Switching Views With RadioButton And Saving Views In Bundle

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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Android :: Custom List Cursor Adaptor Crashes At BindView On Emulator - Not On Phone

Aug 23, 2010

I will try to be specific if I can - please be patient, first time asker and relatively new to programming on this platform. Apologies if this has been asked/answered before - please link it to me. I have searched up and down but find other unrelated (to me at least) problems.

The real puzzler for me is that my app is crashing on my emulator but when installed on my phone (via upload of apk to phone and then using an AppInstaller app from market) it works.

The crash comes from a NullPointerException at the numbered line in the following code snippet (my code) of a custom list cursor adapter.

CODE:....................

The following error dump is created.

CODE:..............

Curiously I have been happily programming and debugging away all day and out of the blue a long working and bug free portion of my app now throws up this error.

I suspect it might be a problem with the databases, but really not sure - nothing seems out of place there. Up until today I had a database with only one table - today I added a new table which also has a "_id" field as the name autoincrement key field, which I read in the docs was required for android list adapters (if memory serves). Having some experience in coding and some minor experience with databases, that seems like a bad idea to me but I am uncertain of if that is the problem and/or how else to do it.

The crash I am listing here does not display or make reference to the data in the other, new table. The cursor does not contain any query data from it. In fact if I rename the key field "_id" of the new table to something else (ie "_blah"), the crash remains.

Like I said, if I upload the apk to my phone, it works.

I have tried the following on the emulator:
- restarting adb (and eclipse) - no result
- uninstall from emulator - no result
- destory AVD profile and recreate - no result

I am developing this under the Android 2.1 SDK, and have been for the last few weeks. I have only ever had that SDK installed, I am yet to update to 2.2.

Not sure what else I can say here - hoping somebody here has experience enough to shed some light on it.

Without a fix to this, I can anticipate a very slow development process here on out (assuming I have to upload to my phone to test new code changes...).

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Android :: How To Align Views In The Middle Of Another Views Baseline

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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Android :: Do Root Views Of An Activity In Android Have Any Prior Knowledge Of The Child Views That Will Be Loaded Into Them

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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Android :: SimpleCursorAdapter

Jun 25, 2009

I am trying to pull data from a cursor which is initialized as follows:

Uri inboxUri = Uri.parse("content://sms/"); Cursor c = managedQuery(inboxUri, null, null, null, null);

This effectively gets me to latest text message that has been sent/ received. I am now trying to put certain fields into a listView, but need to format them before displaying them. The date is represented in the table in milliseconds and I want to convert it to a date before placing it in the list.

Here is where I am trying to place the date in my list. How can I format these fields before placing them into my listview?

CODE:.......................

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Android :: Programmatically Add Views To Views

Mar 7, 2010

Let's say I have a LinearLayout, and I want to add a View to it, in my program from the Java code. What method is used for this? I'm not asking how it's done in XML, which I do know, but rather, how can I do something along the lines of (One View).add(Another View) Like one can do in Swing.

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Android :: Spinner - SimpleCursorAdapter

Apr 27, 2010

I'm having problems with spinner. I'm using spinner that is bound to a SimpleCursorAdapter. I want to retrieve the text value of the selected item. So i tried

CODE:..................

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Android :: AutoCompleteTextView And SimpleCursorAdapter

Apr 14, 2009

I am trying to connect a AutoCompleteTextView with a SimpleCursorAdapter, which narrows down the selection of a list of words, when the user starts typing.

Following some other posts here, I've come up with the following code, but it doesn't work. I defined a FilterQueryProvider runQuery() method for the SimpleCursor Adapter, but when I use the debugger in the code, the response from the ContentResolver.query((0 method call is null.

I think the problem is that there is no relationship between the CONTENT_URI and the SQL database, but I can't be sure.

CODE:.......................

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Android :: SimpleCursorAdapter And Blobs

Mar 24, 2009

The favicon field returned by the browser bookmark provider is a sqlite blob. I want to display the bookmarks in a listview with the favicon but couldn't find a way to do it. I tried using a SimpleCursorAdapter.ViewBinder but I get an exception.

This is what my code looks like :

CODE:...................

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Android :: How To Use AutoCompleteTextView With SimpleCursorAdapter

Apr 8, 2009

I have an application that involves reading a text dictionary file with about 7000 entries, and allowing the user to choose one of these. My first approach was to allow the user to select one of these by using a AutoCompleteTextView together with ArrayAdapter<String>. This works, but is very slow (~10 seconds to update the word list each time the user enters a character to narrow down the choice).

I was wondering how to rework it so that I could use a database using a SimpleCursorAdapter instead. In other words, to hope that a SQL database could provide a more efficient ordering and access for the elements. Is this the best way to do it? I've also seen several references to SQLiteDatabase, but don't know which one to use.

I found this code fragmant consisting of an extended SimpleAdapter. http://sacoskun.blogspot.com/2008/08...leadapter.html<http://sacoskun.blogspot.com/2008/08/autocompletetextview-with-simple...>

Unfortunately, this is not a complete worked out example. Could someone forward me a more complete example? I've found lots of code fragments, but no code that shows how to initialise the SimpleCursorAdapter contents, or how it works together with the AutoCompleteTextView.

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Android :: Sqlite And SimpleCursorAdapter

Apr 1, 2010

I want to create a table whose primary key will be some other field and not _id . The below table gets created but the value of _id remains null :

"create table accounts ("+BaseColumns._ID+" integer , profile_name text primary key" +" name text not null);";

My doubt is wont _id get auto incremented if we do not place "+BaseColumns._ID integer primary key autoincrement+" .

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Android :: Simplecursoradapter - Close Cursor

Jul 19, 2010

If I pass a cursor to a simplecursoradapter, do I still need to close the cursor? if so when: after I pass it to the adapter or when the adapter is finished?

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Android :: Filtering SimpleCursorAdapter ListView

Feb 27, 2010

Since the query that comprises my ListView basically gets the rowID, name, and a third column from my databases's table, I want to be able to filter the cursor based on the partial value of the name column. However, I am uncertain of whether I can do this directly from runQuery without expanding my DB class since I want to filter the existing cursor, or will I have to create a new query function in my DB class that partially searches my name column, and if so, how would I go about creating the query statement while using the CharSequence constraint argument in runQuery?I am also concerned about the performance issues associated with trying to run multiple queries based on partial text since the DB table in question has about 1300-1400 rows. In other words, would I run into a bottleneck trying to filter the cursor?

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Android :: Extending SimpleCursorAdapter With A Custom GetViewBinder

Oct 31, 2010

Im using the NotePad example as a base for an application. This binds a ListActivity to a Provider.

Its perfect, except it uses SimpleCursorAdaptor, which means the list only binds to and displays one item per row. I want it to display two items, both bound the Provider. Or more accurately display the text from one Content Provider field and an icon which depends on the value of a different field.

This sounds like a pretty simple thing to do, a very slight modification to the NotePad application. Trouble is, I have no idea on *how* to do it. I really need a starting point, and "approach" to use.

So far I have tried (unsuccessfully):

* Hand populating the ListView by reading in the Provider data and populating an array in OnCreate. This works, except as the data is not bound the List does not update when I add an item.

* Extending SimpleCursorAdapter with a custom getViewBinder. Could still only bind to a single column.

* Building my own ListAdaptor. Couldn't get this to work.

* Concatenating both fileds together and "parsing" 2 fields into 1 field read/write.

The next thing I will try is extremely tacky running two separate simpleCursorAdaptors in two views in a Linear Layout, fudged so the row height is identical, and duplicate the logic.

I say this only to show that I really, really have tried.

How I can create a custom CursorAdaptor which binds to two fields instead of just one like SimpleCursorAdapter?

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Android :: Binding Images From Assets To A SimpleCursorAdapter

Nov 23, 2009

I was poking around in the documentation for the simpleCursorAdapter and I read that if the simpleCursorAdapter doesn't identify your images as resources it will assume they are URIs. My question is how do i retrieve the URI for an image placed into the asset folder of my application?

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Android :: Enabling Fastscroll From A ListActivity With A Simplecursoradapter

Nov 24, 2010

I know you can set fastScroll for listViews, but currently I would like to use a ListActivity with a simplecursoradapter instead. Is there no way to make such a view fast scroll?

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Android :: Jerky Scrolling When Using SimpleCursorAdapter With ListView

Jul 23, 2010

I'm getting some very jerky scrolling while using the code below to create a ListView from a Cursor. Is there something I'm doing wrong, or any way to improve the performance of this ListView?

CODE:.............

Note: bookmarkStore.getCursor() returns an unmanaged cursor from a sqlite database containing the columns from bookmarksColumns.

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Android :: Add Extra Elements Into Cursor Or SimpleCursorAdapter?

Jan 31, 2009

Suppose I get a cursor that contains all rows from my database, and I want to show them on a spinner, the following code will work. But I want to show two extra items as the spinner elements, how can I add those two elements?

For example, if the following code can show 4 spinner elements "Orange" "Apple" "Cabbage" "Green Onion", how can I add an element in the spinner saying "All fruit" "All Vegetable"?

CODE:....................

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Android :: No Data Appearing In ListView - Using SimpleCursorAdapter

Jul 26, 2010

With the below code, nothing appears in the ListActivity as I would expect.

No errors are shown in logcat.

CODE:..............

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Android :: OnClick Inside ListActivity Using SimpleCursorAdapter

Sep 6, 2010

I've got a class that creates a list from a DB using SimpleCursorAdapter. I want to add an onClick event to each item in the list but I don't know where to place the code.

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Android :: Perform A Click On A ListAdapter Or SimpleCursorAdapter?

Jul 20, 2010

I cant figure out how to perform an onClick on my ListAdapter.

Here is my code:

CODE:.....................

I want to be able to click on an item from the database, then go into a view that only contains info for that item. My class currently extends ListActivity. I've tried OnItemClickListener, but I dont know what else to use to make it work.

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