Android :: Do Null SQLite Data Fields Take Up Extra Memory?
May 9, 2010
I'm using the built in sqlite library on the Android platform.
I'm considering adding several general purpose fields that users will be able to use for their own custom applications, but these fields will be blank most of the time.
My question is, how much overhead will these blank fields add to my database? Do null fields even take up per record memory in sqlite? If so, how much? I don't quite understand the inner workings of a sqlite database.
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Oct 20, 2010
Please direct me to a description of the techniques that the ContentProvider employs to access data. I am trying to understand how it works as well as what is tunable or even if its meant to be tunable. It the memory management tiered, cached, virtual, flat? Is it file based, shmem based, stream based? Can there be a combination thereof?
Any information, suggestions, or references are welcome. The android fundamentals page says: "The data can be stored in the file system, in an SQLite database, or in any other manner that makes sense;" but the android ContenProvider page barely skins the onion.
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Nov 6, 2010
In my main activity, I have the following code that calls my FileBrowser activity: What's wrong? Can I not use putExtra with startActivityForResult? Can putExtra only be used with startActivity? Code...
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Oct 30, 2009
I have some external sqlite files I'd like to include with my app. It looks like I can add them to the /assets folder, then read them from there? Is the /assets folder the appropriate location for them?
I've used SQLiteOpenHelper to open databases my app creates at runtime, which just uses a unique db name. Will the sqlite files in the assets folder also be accessible using SQLiteOpenHelper in the same manner?
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Dec 16, 2009
The product I have in mind is a Android phone with 32 GB of internal storage, plus the usual microSD expansion slot.
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Oct 10, 2010
I'm trying to add a custom data field and MIME type to the Contacts screen. Is there a way to do this such that when a user views a contact with my data saved on it, my field appears there? This is something I've seen other apps do--how do the Facebook, Twitter, Last.fm, etc. apps add their status information to contacts, for example? I can't seem to figure it out from the Contacts API documentation.
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Sep 10, 2009
As the title says? Or what situations can cause this method to return null? I would of thought it retained this object always.
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Aug 19, 2012
I own a (quite old now) Google Nexus One and I recently upgraded from Google Maps v6.9.0 to Google Maps v6.10.0
And I was quite surprised to see my user memory decrease a lot while the install apk is quite the same between both versions.
My Nexus One is rooted and running stock Android 2.3.6 (GB, not ICS)So I investigated and here is what I found about this new version of Google Maps.First, you must know that the memory available to the user to install new applications is mounted by the android system as '/data'.By running a 'du' command, I discovered that the following folder:
Code:
/data/data/com.google.android.apps.maps/app_
takes 11.9 Mo, which is a lot.[code].....
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May 27, 2010
Based on the Searchable Dictionary sample I tried to put extra data to a different activity. In my Map Class Distance is always zero because distance.getSelectedItemPostion() gets the initialized value. How can I put Extra data with a click on a search?
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Oct 23, 2010
I would like to be able to save& view the data from 3 edit text fields and a date pick to an SQL lite DB. Can anybody point me to a decent beginners tutorial or perhaps give me an idea of where to start?
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May 12, 2010
In order to provide the best experience, HTC EVO 4G will use Sprint's industry-leading Everything Data or Business Advantage Messaging and Data plans that include unlimited Web, texting and calling on the Sprint Network to every mobile in America with Any Mobile, AnytimeSM. Everything Data plans start at $69.99 per month. A $10 per month Premium Data add-on will apply allowing customers to take advantage of a richer data experience than ever before.
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Feb 19, 2009
I have a newbie question which is puzzling me regarding using Intents to start a new Activity but passing some data with the Intent for the new Activity to use. My app has (say) MainActivity from which I want to launch a second activity, SecondActivity, within the same app, whilst I pass an integer parameter to SecondActivity. Now my problem is : how do I receive the Intent when SecondActivity gets started and recover the value of the integer parameter ? Which member function of.
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May 19, 2010
On Sat, May 15, 2010 at 6:10 AM, Sohan badaya <sohan.bad...@gmail.com>wrote: > In my application i want to show facebook friends name with online status.
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Nov 23, 2009
I have as an example, this provider information from the PackageManager. Code...
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Sep 14, 2010
How large can be the database of my Android app? Is there a limit?
For performance reasons, I don't want to store the database on the SD card.
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Jul 20, 2010
I am trying to do what I think is a fairly simple task to authenticate a user on my server. I am using AsyncTask as a private subclass of my Activity, however when I try to populate the user object after authenticating it keeps setting it to null. Is there something strange in how the onPostExecute() method is called that is causing this? I originally had the AsyncTask as its own class but ran into the same problem, so I am try to solve this using a private subclass.
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Oct 26, 2010
I am trying to create a file ,if it doesnot exist and tried to write some data to it. The same program I did in java, it was running fine.But when I try to do the same thing in Android I am getting NullPointerException at the place where I am trying to write data to file. And also, I did not find any new file in the current directory .
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Sep 15, 2010
How to access existing data from sqlite and how to implement the data in list view in android.
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Jun 8, 2010
If I have a bunch of data that is never going to change (eg. an English language dictionary or the rgb values of a couple hundred color names), how do I use an SQLite database to store it? I know a database is faster than loading everything into memory when the app starts, but how do I make the database either the first time the app runs or "before" the apps ever runs?
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Dec 16, 2009
I want to store location data in sqlite. A latitude coordinate is a double, with 15 point precision. As far as I can tell this corresponds with the 'REAL' datatype which is 8 bytes. The alternative I suppose would be to store it as a String, and simply convert it back into a double later. Does it make any odds which way I go? Are there differences in storage capacity / efficiency?
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Aug 14, 2010
I am an android application developer. I am developing an application which requires of me to use Sqlite database. I have implemented fetching the data, but i am facing problems when i try to insert data into the Sqlite database. The problem that i am having is that the new data i enter is not fetched, i.e nothing is new is being entered into the database.
this is the method i wrote in Data.java
myDataBase is an object of SQLiteDatabase
public void insertTitle(String Recipe)
ContentValues initialValues = new ContentValues();
initialValues.put(COLUMN_NAME,value);
myDataBase.insert(ZRECIPE, null, initialValues);
}
and i create an object "d" of it in Add.java, where i call the "insertTitle()" method. But nothing is inserted.
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Sep 21, 2010
How to display data from sqlite in textview..
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Oct 23, 2009
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Sep 17, 2010
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Nov 26, 2009
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Sep 7, 2010
How to get data from SQLite which contains some data. How to place it(the data) in the listview.
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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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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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Aug 22, 2010
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Oct 11, 2010
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