Android :: Binding List Views To Large Data Sets

Feb 1, 2010

I need to be able to scroll through a list with (up to) 20K rows, backed by a cursor on a read-only db. Testing 20K rows on a G1, the query takes approx .02s regardless of table size, while binding the adapter to the list takes 4.5s. Note that this is before the view calls used in rendering. What makes the binding delay more troublesome is that it blocks the UI thread, and is incurred on every rotate. Combine these, and doing a rotate just after starting the bind results in a delay up to 9s.

I tried lazy loading with a base adapter, but that hits the same delay in the underlying cursor.getCount(), and the overall user experience isn't ideal. I also considered using an ArrayAdapter, adding synthesized objects from the cursor rows, but then I'd incur the overhead of creating up to 20K objects (not to mention the additional memory requirements).

Android :: Binding List Views to Large Data Sets


Android :: Best Practices Combining List And Non-list Views

Jan 10, 2010

I'm trying to tackle a problem that seemingly many Android developers have, which is how to intersperse lists with non-list data, in one big scrollable pane.The model I have in mind is the screen for an individual app in the Market. You have a big description, a list of a few lazily loaded comments, and then some individual items that do different things, like visit the developer's web page, call them, etc. And then in between them all, are nice section headers.Emulating this approach seems to be extremely hard. I've read enough SO answers and mailing list posts to know not to put a ListView inside of a ScrollView, but I want the same effect without using addHeader() and addFooter() with very complex header and footer views. I've tried using a LinearLayout that I stock with views myself, but I can't get the pleasant click effects that default list items have (the orange background, white for long-click, etc.).

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Android :: Child TextView In ScrollView With Large Amount Of Text Pushes Other Views Off The Screen

May 6, 2009

I am trying to create an activity layout that has a top level vertical linear layout like so:

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

This works ok as long as the wordDefinition text isn't very long. But, when I set the text to something very long, it pushes the back button off the bottom of the screen. Why? Isn't the ScrollView supposed to scroll the text in the child TextView?

I've tried playing with weights (e.g., giving the top text view a weight of .2, the scroll view a weight of .7 and the button a weight of .1, but to no avail.

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Android :: ListView Data Binding From XML Parser

Aug 17, 2009

I currently building an android apps that retrieve data from a distant Web service and I search an efficient way to bind data form XML to ListView. I already use CursorAdapter and i search on the web for an "XmlAdapter". I read on Google IO topic "Coding for Life - Battery Life, That Is" (http://code.google.com/events/io/sessions/ CodingLifeBatteryLife.html) that is more efficient to use "stream parser" instead of "tree parser" but I don't find the way to build a class that implement ListAdapter because of stream parser can't navigate backward so I don't understand how implement method that use "position" parameter (How retrieve data before current XML Parser position?).

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Android :: Spinner Data Binding In Application

Sep 17, 2010

There is no solution for this?

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Android :: Binding Spinner To Custom XML Data

Jun 18, 2009

Can anyone tell me if its possible to create some kind of custom adapater for XML data to a Spinner? I'm wanting to create a set of XML data that contains city names & latitude/longitude positions but only display the city name in the Spinner and access the lat/long when a new city is selected.

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Android :: How To Get Data From Service In Widget Without Binding?

Nov 13, 2010

I am writing application that has service that provides real time data to subscribers via remote callback mechanism. Now I wanted to add a widget that visualizes essential part of this data but got error: "IntentReceiver components are not allowed to bind to services". So what's the right way to get data from that service?

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Android :: Binding Data From Database To Checkbox In ListView?

Oct 1, 2009

I'm trying to bind data from my SQLiteDatabase to a ListView. I'm currently using a SimpleCursorAdapter to fill in my ListView. Unfortunately this doesn't seem to work with setting a CheckBox's checked attribute. This is how I do it now; instead of changing the CheckBox's checked status the adapter is filling in the value to the text argument, so the value is displayed right of the CheckBox as text.

Java:
setListAdapter( new SimpleCursorAdapter( this, R.layout.mylist, data,
new String[] { Datenbank.DB_STATE, Datenbank.DB_NAME }, new int[] { R.id.list_checkbox, R.id.list_text } ) );

mylist.xml:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout android:id="@+id/LinearLayout01"
android:layout_width="fill_parent" android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android" >
<CheckBox android:text="" android:id="@+id/list_checkbox"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:checked="false" > </CheckBox>
<TextView android:text="" android:id="@+id/list_text" android:layout_width="wrap_content"
android:layout_height="wrap_content" > </TextView> </LinearLayout>

The field in the database is of course of type boolean and I've also tried to assign an id to the checked field to fill the value in.

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Android :: Loading A Large List Of Contacts Into A ListAdapter - Making It Responsive

Jan 23, 2009

I need to load Contacts.Phones.CONTENT_URI and Contacts.ContactMethods.CONTENT_EMAIL_URI into a ListActivity.

Since these are separate Content URIs, I have two separate cursors and can't construct a SimpleCursorAdapter for use in the ListActivity.

The problem is that I have more than a thousand records for CONTENT_EMAIL_URI, which were automatically loaded by GMail. The app becomes unresponsive and Android prompts to kill the app or wait.

Is there a way to make the ListActivity content load in the background, like, by writing a custom implementation of android.widget.Adapter?

Or is it more feasible to use a single cursor, by manually running the SQL query on the contacts tables?

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Android :: List View Invalidate Views Not Working

Nov 11, 2010

I have an List Activity with a Base Adapter where the contents have changed (example - the rows are reordered). I have tried invalidate.
Code...

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General :: Managing Large List Of SSID And Passwords?

Dec 13, 2013

At work we have about 50 different hotspots with each having their own SSID and password. Is there any way for me to mass enter them from a list into my Moto X?

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Android :: Large Data File / How To Deal With It?

Dec 10, 2009

My application needs to intensively manipulate (read-write) on some structured text data.The size of the data is significant 1Mb. And there is initial data available for the user to start with.My idea is to put this data as a file in the .apk. Then, on initial application launch to read this data and populate Android SQLite database with it. Then just work with this database. But after the database is populated the data file is no longer needed. And I'd like to remove it to free some memory. Alternate approach is to work with this data file instead of SQLite database. But I assume SQLite would work a magnitude faster then i/o on my data file..

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Android :: Deploy Large DB With APK To Import Data?

Jan 21, 2009

My application may consist og 100Kb code and 800 Kb Database content. If I include a datafile with the 800Kb data and import it into an SQLite database under the initial run of the applcation, I cannot delete the data file afterwards and my application will take up 800 Kb unnecessarily. Is there a better way to include/import my data....? (I want my application to not depend on being online after download - so the data should be downloaded with the application.

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How To Open Views List On Eclipse

May 19, 2013

i want to add a button for my android app that i am creating on eclipse but i want to do it by dragging it from the views list and the problem is that there is no views list in my eclipse. how do i open the views list? i have allready added the adt plugin. is there a way to open the views list or if its not there the problem is with the adt?

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Android :: How To Pass Large Amount Of Data During StartActivityForResult

Nov 3, 2009

From one activity, I want to pass a lot of data (about 1MB of Strings).I tried sticking it in Intent.putExtra(ArrayList<String>), but if I put in too much data, I get "FAILED BINDER TRANSACTION".What's the easiest way? I don't want to publish a service, or use the file system. I really want a pipe that can write data from one end and read it from the other end. I can handle the case where the starter Activity dies while the "startee" activity is trying to read from the pipe.

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Android :: Inserting Large Volumes Of Data Into SQLite

Sep 2, 2009

I need to insert approximately one million rows of data (spread over 4 tables) - each row has one or two numeric fields, and two or three text fields (normally quite short). Single-column indexes on all the fields. After doing some tests on the emulator with a small test set, I extrapolated (assuming the last row will be inserted with a similar speed to the first row) my results to figure out that this would take about 15 hours (I have a Core 2 Duo running Vista). However, then I tried running the small test set on my Hero and I was surprised to see it run more than four times faster. I would guess it would take about 3 hours on the Hero. Alternatively, I could make the pre-populated database available as a download on the first run but this is likely to be a 120MB download. I have a few questions I'm hoping someone can help me with: 1. SQLite performance on the actual device being 4-5 times faster compared to the emulator - is this normal/expected? 2. Do the figures above generally sound fast/slow/normal (sorry this is so vague)? 3. From a user perspective - would it be best to provide a 120MB download or a 3 hour "first-time initialisation" step (plus 6MB download)?

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Android :: SQLite Handle Large Amount Of Data?

Jun 26, 2010

I will be making a mobile application in Android. My application is like Google Map's Get Direction feature, but a lot more complex, so I need to store data about points in the map. So I'm worried that SQLite may not be able to handle these large amount of data(or considering the limited storage of the phone). I have no background in SQLite so please bear with me.

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Android :: Application Requiring Large Data Files

Jun 10, 2009

I am working on an android app that needs to act on a few data files totaling around 30MB. I put together a test and the emulator failed with OutOfDiskSpace. Debugging on a device failed with even a smaller data size. After reading through the google groups, it appears that the application size limit isn't stated anywhere and nobody from google has been forthcoming with specifics about this. Given that there are iPhone apps that are over 100MB in size, putting such a small limit on Android apps seems weird, except just for the fact that you have a relatively small amount of total available app storage space (< 100MB).What techniques do you use to deal with this limit? If you have an app that needs more than 10MB, do you put it on a web server and deal with downloading it the first time? If so, how do you handle access control so that only your app can get the data?

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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 :: Simple Cursor Adapter - List View - Binded To XML Document With Three Text Views

Mar 18, 2009

I have table with 3 columns which is binded to an XML document with three text views.

CODE:........

Depending on the value store in the third column, I want to change the text color in R.id.c. How should, I go about with this.

This is what I have so far :

COD:...............

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Android :: Java.lang.OutOfMemoryError When Download Large Data From Website

May 30, 2010

when i download large data from website, i got this error information:

I/global (20094): Default buffer size used in BufferedInputStream constructor.
It would be better to be explicit if an 8k buffer is required.
D/dalvikvm(20094): GC freed 6153 objects / 3650840 bytes in 335ms
I/dalvikvm-heap(20094): Forcing collection of SoftReferences for 3599051-byte al
location
D/dalvikvm(20094): GC freed 320 objects / 11400 bytes in 144ms
E/dalvikvm-heap(20094): Out of memory on a 3599051-byte allocation.
I/dalvikvm(20094): "Thread-9" prio=5 tid=17 RUNNABLE
I/dalvikvm(20094): | group="main" sCount=0 dsCount=0 s=0 obj=0x439b9480
I/dalvikvm(20094): | sysTid=25762 nice=0 sched=0/0 handle=4065496

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Android :: Remove Data From List And Add New List

Nov 3, 2010

I have lot of lists: for example: Categories, and subCategories, in my case some Categories has subcategories, So What I want to do, is if the categories has subcategories I want to clean the recently list and show the subcategories,(This can be solved by creating new activity for only subcategories, but I would say that the most of the code woyld same)I wounder how can I updoate list whit new data?If possible to add some animation when clicking, so the list goes to left when clicking, and showing data comes from right,

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Android :: Large Screen On 1.6 - All XML Files Of Layouts In Layout-large Can't Load

Oct 23, 2009

I want make it support multiple screens(small,normal and large).I am 100% sure the all of layouts are working perfectly now, but large screen,the problem is that all XML files of layouts in layout-large can't load,The platform always load default XML file(these are under layout folder) at large screen environment.

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Android :: Preserve Data In Views When Switches Between Landscape And Portrait?

Feb 9, 2009

1) Does Google think there will only be one screen size on Android phones? The reason I ask is because I haven't been able to find anything on "variable" layouts in Android? I would like to create a layout with 2 webviews, one 80% of screen height and the other 20%. Is this even possible, or do I need to assign the height of each as a static "px" value?

2) How do I preserve the data in my views when someone switches between landscape and portrait? I doubt it's hard, but I've not been able to find it. Can someone post an example?

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Samsung Moment :: Phone / Radio Locks Up After Large Data Use?

Jan 6, 2010

After playing pandora, slacker or using other data intensive apps the radio locks up. The up arrow just sticks and the only recourse is to restart the phone. Anyone else experiencing this? I did find if I turn off bluetooth and wifi(even though im not using it) it doesn't seem to happen nearly as often. Maybe its a heat issue?

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General :: Abootimg Error - Value Too Large For Defined Data Type

May 3, 2013

I'm trying use abootimg to extract the bootimg.cfg file but it keeps giving me the error:

Code:
~/Projects/dualboot_bt_android/BT5-GNOME-ARM$ abootimg -x data.img bootimg.cfg
data.img: Value too large for defined data type

I think I'm getting this because the data.img is 4.9 gbs in size, but I don't know how to resize the it...

Can't believe I overlooked it. I tried to extract it from the data.img instead of the boot.img like I was supposed to. No wonder it didn't work.

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Android :: Approach To Cache Large Amount Of Textual And Audio Data / In Android Application

Jul 13, 2010

We are supposed to cache textual and audio data in our application until device is booted or maximum of two days, whichever happens earlier. To get a perspective on data to be cached, note that we are to store about 200 text headers containing around 10 fields, each of length 30 bytes and about 20 sound files each about a minute long.We are getting the textual data by parsing XMLs and then we keep them in ArrayLists. The sound files are directly written inside the app storage using File I/O (and not on SDcard or Apps Cache directory).This application is to be run on devices running Android 1.5 or later.I understand, and please correct me if I am wrong, that we can cache the files either on SDcard or inside the application or inside applications Cache directory.

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Android :: List View Methods Invalidate Vs Invalidate Views?

Dec 23, 2009

What's the functional difference between these list view methods: invalidate() and invalidate Views() ? Which one is faster to refresh a list view?

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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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