Android : Creating App Database With Big Amount Of Data
Dec 23, 2009
The database of my application need to be filled with a lot of data, so during onCreate(), it's not only some create table sql instructions, there is a lot of inserts. The solution I chose is to store all this instructions in a sql file located in res/raw and which
is loaded with Resources.openRawResource(id).
It works well but I face to encoding issue, I have some accentuated caharacters in the sql file which appears bad in my application. This
my code to do this : Code...
The solution I found to avoid this is to load the sql instructions from a huge static final string instead of a file, and all accentuated characters appears well.
But Isn't there a more elegant way to load sql instructions than a big static final String attribute with all sql instructions?
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May 23, 2009
I am new to android and I have a problem in creating a database.
public class database extends ListActivity {
/** Called when the activity is first created. */
private final String MY_DATABASE_NAME = "myCoolUserDB.db";
private final String MY_DATABASE_TABLE = "t_Users";
Context c;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ArrayList<String> results = new ArrayList<String>();
setContentView(R.layout.main);
SQLiteDatabase mydb=null;
try
{
mydb.openOrCreateDatabase(MY_DATABASE_NAME, null);
} catch(Exception e){}
}}
When I run this code it throws a run time exception.
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Apr 18, 2010
I have started creating database for my application. It is working well. The data is also getting stored.But the issue is that i require dropping table, that already exists, every time i run the application.
But one thing i found is that whenever i change the version of the database in my code, the table gets dropped. But i would like to know whether it is possible to drop table without changing the version number of the database.
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Apr 5, 2010
I am trying to write a streaming application.I have my own decoder and I am playing PCM audio using AudioTrack. At any point in time I want to know how much data is buffered with the device. I want to use this so that if the data with the device go below a level, I want to go into a buffering mode where I will buffer 2-3 seconds of data before continuing playback again. Can someone please tell me how to do this?
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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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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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Jun 14, 2010
I want to create a SQLite database in my app, which contains three tables, I will add data into tables and will use them later on.but I like to keep database ,as if when app is first time installed it checks whether the database exist or not, if exists it updates it else if not then creates a new database.further more I am making a DB class to facilitate my app,so I wont be creating an activity for my database creation.if there are possible advices, please share with me
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Jun 6, 2011
Is there a way that I can use my own database when creating an app?
What I mean by that is that I want the app to start with a database already loaded so one doesn't have to be created when the app is started?
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Feb 22, 2010
How to create two or more tables in one database in single class which extends sqliteopenhelper in one function oncreate.
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May 12, 2010
I have decided to go to a smartphone on 13th June when my present contract expires. My Query is, I am in the U.K. and if I look at contracts for the iphone they normally include unlimited Wifi and 1Gb of wireless data, whereas the Desire seems to come with only 500Mb of wireless.
I would much prefer to get a Desire, but I am concerned that I could be lumbering myself with excess charges if I go over the 500Mb limit.
I have never had a phone with an Internet connection before so I'm sure that there will be a lot of playing going on at least to start with.
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Mar 27, 2014
i have a church database which i want to create an App which contains all details in the database....with a search button to search the database...
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Aug 2, 2010
I was wondering if the weather app that Moto has built in still uses the same amount of battery/data regardless of whether or not it is on the home screen. I took the widget off the home screen and stopped the weather process and it just comes back anyway. So the weather process is still running in the background. I'd like to use the weather widget, but don't want to deal with battery drain. Bad enough my phone has reset itself twice in the last 24 hours.
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Sep 20, 2010
I am creating an app which allows for many different Activities to be started from a TabActivity(up to ~25). Most of the activities require data from the sqlite database, so when onCreate is run, an AsyncTask creates an SQLiteOpenHelper object(which will open a readable/writable database), runs a query, data is retrieved, and everything is then closed.
I was just testing messing around to see if i could break something, so i added every Activityto the TabActivity's TabHost. I then started mashing each tab as quickly as possible.
I noticed that very quickly i began to see in the LogCat: Caused by: android.database.sqlite.SQLiteException: database is locked: BEGIN EXCLUSIVE; and the app proceeded to die.
Typically there will only be about 4-6 tabs(i can just limit the user anyway) for the TabHost. I haven't been able to break anything with a small amount of tabs to mash, but i am still worried that maybe i am accessing the database in a poor way.
How can i prevent my SQLiteDatabase objects to cause a lock?
If i create a ContentProvider will that eliminate the possibility of database locking?
Do you have any suggestions for changes I could make for accessing data from an SQLiteDatabase?
I ended up taking the approach of using the Application class and storing 1 SQLiteOpenHelper and trying my best to keep it synchronized. This seems to be working great - i put all my 25 activities in the TabHost and mashed away on them with no errors.
I am calling ((SQLiteDbApplication)getApplication()).setDbHelper(new DBHelper(this, Constants.DB_NAME, null, Constants.DB_VERSION_CODE)); method(shown below) in every onCreate() in my activities
Any further suggestions to this approach or to the changes i made using this Application class?
CODE:...................
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Nov 25, 2010
So I've had my DHD for 3 days, done a little 3G browsing the usual stuff Facebook, emails etc., but nothing more as I used my home WiFi for the widget and app downloads. But today I got a text from Vodafone saying I was near my internet usage limit for the Month! Within 3 days!? I have a 750MB limit, which the chap in the shop assured me was enough to keep me happy as 'no one ever goes over that.'
I was happy with that even though my previous contract was unlimited internet as he said it would be ok. All I can think of is the email syncing, so turned that off. But what else could be causing me to go over the 750MB limit within 3 days? Surely thats a huge amount to be used?
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Sep 13, 2010
Maybe a rookie question, but here goes.I've seen a lot of posts about where to find an app/widget that allows you to switch between 3G and 2G. My question is: why would I want to do this? Does switching to 2G lessen the amount of data usage (which could be important, considering I'm on AT&T's 200 MB plan)? Or is there some other benefit/reason for doing this?Related: I have the SwitchPro widget, which has a 3G-2G switch available -- does this mean I am able to switch if I want to?
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Jan 19, 2010
Is there something like a FileDialog available? From previous threads, it appears there isn't one.
If not, has someone written one?
I want to allow a user to
a) Specify a folder/filename on storage for creating an SQLite database.
b) Specify an existing file/folder on storage card for opening as an SQLite Database.
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Nov 11, 2010
Just got my first android phone, the eris! I'm really excited, if anyone could help me out with some tips please do! are there ways i can watch my data usage, since i have a limited amount?
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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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Mar 15, 2010
I am building an application for Android (1.5) that, after quering a webservice, shows to the user a big amount of data that should be displayed in a "grid" or "table" style.
I must show a result of about 7 columns and 50 rows (for example a customer list with names, addresses, telephone number, sales amount last year and so).
Obviously, the 7 columns will not fix in the screen and I would like the user would be able to scroll up/down and LEFT/RIGHT (important because of the number of columns) to explore the grid results.
cell selection level is NOT necessary, as much I would need row selection level.
What is the best approach to get this interface element? Listview / GridView / TableLayout?
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Feb 4, 2009
This issue has troubled me a lot, please help if you have any ideas.
- I am accessing an xml file from withing the apk, (stored in /res/ raw). The xml is read succesfully. My goal is to use this xml file as data that can be changed in the apk.
- I tried unpacking and packing the apk file with ZIP compression and the newly packed apk worked on the phone.
- I changed the xml file and packed the contents of the apk into a new apk
- "install was unsuccesful" was the result of installing the new apk
As I see it, for every file stored into the apk, there are equivalent references stored in the manifest and cert files:
for example: SHA1-Digest: YS8iSCii71WMNrK7CHy5XLXBo+k=
Do you have any other ideas of how I can store/alter information into the APK?
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Apr 6, 2014
I send data to my mysql database the posted data is empty...I don't know what is wrong with my code.
[HIGH]urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestMethod("POST");
urlConnection.setDoOutput(true);
urlConnection.setChunkedStreamingMode(0);
OutputStream out = new BufferedOutputStream(urlConnection.getOutputStream ());
[Code]...
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Jan 16, 2010
I've created some ring tones and want to transfer them to my phone. I see that I need to create a folder and I don't know how to that. I'll assign them to people in my contacts from there.
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Feb 26, 2012
I was wondering how I can create a variable for whether or not my phone has data connectivity. I use google voice for texting (I have a sprint integrated google voice number), but when I go out I turn off my wifi/3g to save battery, and text with my stock SMS app. When I swipe upwards on my launcher (Nova launcher), my texting app launches (google voice). However, I would like that gesture to launch a Tasker task - one that launches Google Voice if my phone has data connectivity, or the stock SMS app if my phone does not have data connectivity. However, Tasker does not have a built in variable for data.
More specifically, I would like this task to do the following (in pseudocode)
if (%data == ON)
Launch Google Voice
else
Launch stock SMS app
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Jul 22, 2010
I have a Windows web server already set up with a website (unlimited application pools) and I want to be able to access a database on that server via the Android app I'm developing. How can I do this? Can someone point me to a tutorial or give code example of how this cross-platform (Android/Java to ASP.NET/C#) communication can be done? (I'm trying to create a leader board or global scoreboard for my Android game on my server.)
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Jul 10, 2009
I created the following method for retrieving stored settings from the database:
public String getEntry(long rowIndex){
String value = "";
Cursor c = db.query(DATABASE_TABLE, new String[] {KEY_NAME, VALUE}, KEY_NAME + "=" + rowIndex, null, null, null, null);
int columnIndex = c.getColumnIndex(VALUE);
int rowsCount = c.getCount();
if(rowsCount > 0){
String value = c.getString(columnIndex);
}
return value;
}
On debugging I can see cursor c contains two columns and one row but when it comes to line
String value = c.getString(columnIndex);
it throws the CursorIndexOutOfBoundsException although columnIndex = 1 which should point to a valid entry. Does anyone know what could be wrong here?
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Sep 23, 2009
I am experiencing a problem where when the android device wake up from sleep, the Activity would take forever to get redrawn(and have to terminate it most of the time). I am not sure why, but when I comment out the code below where it retrieves an object from the database based on id stored in the bundle, the problem goes away.
Not sure why the db transaction is causing an issue.
secondly, is it better to store the object in bundle instead of storing its id and retrieving it from db in onCreate?
CODE:...............
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Mar 6, 2009
I'm try to sent/receive data from my remote db server (MySQL) , I know I can't connect the MySQL directly on android . And I'm trying to use the soap , but I'm not sure if this is the right way?I don't have any experience on it , so my question is:" what is the way to sent/receive data from remote db server " in general ? Does it have any examples I can see ?
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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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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 17, 2010
I have the data in the android(Sqlite Database). How to transfer this database data to the System Database( like Access or SQL Server). After Transfer this data i have to use the data in the System.
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