Android :: Data Passing And Database Access
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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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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May 24, 2010
I have an mysql database with some sports results in it. I want to write an android application to display these data on mobile phones.
I´ve searched on the internet for this issue and i think it is not possible to have a direct connection between the mysql database and the android application. (Is this right?)
So my question is the following: How can i have access in the android application to the mysql database in order to display some of the data?
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Jun 28, 2010
I would like to create some home screen app widgets that are entry points into an application. I can put a button in the app widget that uses setOnClickPendingIntent to start the activity. The problem occurs when I want to have two of these app widgets that are entry points to different parts of the activity. I need to be able to pass data into the activity that will distinguish these. Since both app widgets use a Pending Intent that starts the same activity, the two Pending Intents are shared and I can't reliably set extras for the corresponding intents.
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Sep 19, 2010
So I'm getting really confused on how to do this whole thing and I was hoping someone could break it down for me a little bit.I have a service that should always be running, and at certain times it needs to alert the user that a task is to be completed(probably through a notification bar icon). When the user accepts the task, the service needs to look into the local database, construct some non primitive objects, and give them to the activity that it just started.I have looked all over and gotten very confused as to a proper approach so I have a few questions to help me wrap my head around it.If an activity creates a local SQLite database can the service and activities of that application access that same database later?Does the service and activity need to be in the same or separate packages? I would think no but for some reason I remember seeing something about this elsewhere.
How would I do the data transmission from the service to the activity? I was thinking a content provider but it seems like there should be an easier way for the service to just hand off the data. Similar to an Intent but for non primitives.
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Oct 13, 2010
In Handler, we can pass some data from a background thread to the UI thread like this:
private void someBackgroundThreadOperation() {
final String data = "hello";
handler.post(new Runnable() {
public void run() {
Log.d(TAG, "Message from bg thread: " + data);
}
}
}
If we use the above, we cannot then use Handler.removeCallbacks(Runnable r), because we won't have references to any of the anonymous runnables we created above. We could create a single Runnable instance, and post that to the handler, but it won't allow us to pass any data through:.............
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Dec 7, 2009
I would like to ask you smart people if anyone has seen any documentation regarding web access to a database from within an Android application. I would like to create a (FREE) application where the users can share information (rants/complains) around the globe. Each user will be able to see a little globe in his phone with locations of other users and some specific information about them.
Architecturally, I am thinking "database in my GoDaddy host, exposing a web service", and the web service accessed from the Android application. But I see no documentation about accessing web services. I can also go XML, maybe, but I am not seeing what mechanisms exist in the Android for over-the-web XML access.
I have a feeling I am mis-understanding something big in the picture. Can someone point me to docs, or knows something about this topic? (the iPhone has a Lighter app where you can see people lighting around the globe. Mine is similar, but people would not be lighting, instead they will be "complaining/ranting").
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May 26, 2010
I am working on a Android app and I have a dilemma. I have a list of Objects. I have to update each of these objects with a database. I have 2 methods:
Method 1:I can loop through the Objects. For each object I can connect to the server, update it, and then move on to the next Object, and so forth.
Method 2:I can store the Objects in a list, send the whole list to the server, update it on the server side, then return a list of updated objects.
My questions are:
Which method is faster?
Which method is easier on the phone's battery?
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Jul 14, 2010
I understand that to access a SQL database from Android I need to create a web service that will run on the SQL server and will process requests from the Android application, what I need to know is how to create this web service and how to access it from Android.
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Jul 27, 2010
I'm using an sqlite database in my app.
I have this dbhelper class in a services class like so.
CODE:............
In my activity classes I access and keep this application as a local variable like so:
CODE:..............
And my service call looks like this:
CODE:.............
I've added these overrides in to try to get rid of my memory leaks.
CODE:.............
But I can't get my memory leaks to stop.
How to rid myself of these memory leaks? These leaks are of the type:
CODE:..................
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Jun 18, 2010
I am new to android platform. I am testing one android phone application. I want to see the database entries for that.
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Feb 1, 2012
I have to make android app that received files from mobiles and save it on database in pc.
How to create database on pc that i can access it by android app?which technique is the best for this Bluetooth or Wifi or...between the mobiles?
which technique is the best for this Bluetooth or Wifi or...between mobile and pc?
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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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Aug 2, 2010
I am creating an android app that is basically a listing of information on Mushrooms. I get this information from an sqlite database. I have a global singleton with a services class inside it in which I use to access my db. Almost every activity accesses the db. Is it better to leave my db open all the time or open and close it as I need the data? If the best practice is to leave it open all the time, where do I need to make sure to close it and what is the worst case scenario if I left it open when the activity was destroyed?
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Jul 22, 2010
I have four tabs (reports, review reports, map and settings). I have an sqlite database populated with report information. I wish to have the database accessible throughout the application. The reports tab successfully adds data to the database however using the same methodology crashes the application. The Android debugger points to the line where the database is called again.
In the reports tab the following code is used to launch the database...
CODE:.................
In the onCreate() method of the Review Tab - Where I wish to review reports - I try to access to the database through the call calling the return report method
this.reportDatabase = new ReportDatabase(this);
However this fails to work. In the android debugger highlights that the problem belongs with the context being provided to it. I realise that the report database has already been accessed by the report tab and wonder if this is causing the issue. I am new to programming android, the application is designed to report on flamingos in Africa, any help would be greatly appreciated!
Following the suggestion of Seva Alekseyev I have adapted as follows...
I have adapted my ReportDatabase as...
CODE:..............
using...
reportDatabase = ReportDatabase.open(this);
As the call in both the report and review tab. Unfortunately this doesn't seem to work, the debugger stops on the same method. The full ReportDatabase.java file is here...
CODE:...........
This method returns a double array and probably shouldn't be this hacky...
CODE:............
With the error stack being...
CODE:.................
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Dec 12, 2009
I have a problem when using database in broadcastReceiver.
I can't open the database created in the activity. e.g: malwareDB = new PackageDB(this);
The eclipse give me the error that "PackageDB(this)" is undefined.
It seems that the BroadcastReceiver doesn't support the database?
Do have have to access the data base in the "service"?
Here is the definition of "PackageDB":
CODE:..................
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Jan 16, 2010
I'd like to access an Internet database from my app to edit it and read it. Any link I should read or any advise?
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Sep 6, 2010
Is there any way to access the a database server directly in Android? If not, why? Also, are there any external tools for this?
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Feb 11, 2010
How to access my web application database in android emulator, i want list out my database values. These are in my web application. database name employees and table: employee_data. i want to get employee_data data on android emulator.
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Jan 31, 2010
I'm searching information about how i can access a specific database that to not belong to me, and that is store in /data/data/com.... directory is it possible without root access? it it possible with root access, and how?
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Aug 13, 2010
Is it possible to get path of database file in android at path : "/data/system/accounts.db"
In my app i want to use this database, but not getting its path. if i do hardcoding and remove the file i'm able to do it. But i want to access it as database so that i can drop the table.
code i tried:
CODE:.................
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Aug 30, 2010
I have a general Android design question around data access. I have a number of activities in my application that need to access a SQLite database. In order to wrap up all data access logic in one place I have created a DatbaseHandler class that takes care of all data access logic. This class takes care of building up where clauses, calling the database and interrogating the resulting cursor to retrieve the query results and return them to the caller. The purpose of this class is to wrap all data access code in one place so that it can be easily managed and maintained as opposed to having data access logic scattered across all activities. Each activity that needs access to the database creates an instance of this DatabaseHandler class and passes it a reference of android.content.Context. The DatabaseHandler class then uses this Context object to call an underlying content provider as follows context_i.getContentResolver().query(...).
My data access logic (cursor handling logic to be specific) is not in the activity and so I cannot manage the cursors life cycle, therefore there is likely to be memory leaks.
My questions are as follows -
How can I (if its even possible) manage the cursors life cycle from outside an Activity? Should each activity even be creating an instance of this data handler class and passing an instance of Context to it? Perhaps my design approach is wrong and I should expose these data access functions as static methods that take an instance of the calling activity as a parameter. That way I could perform managed queries and let the activity take care of managing the cursors life cycle?
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Oct 18, 2010
I use a sqlite database in my project. The stored data in it must not be available for the user to edit. As I've read here I saw that if you have root access you can alter sqlite database. The only solution would be to encrypt database content, but this would be time consuming for device. Any solution to prevent access to database ?
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Oct 30, 2010
I'm running a .net aspx application. I'll need my android app to access and modify/insert information into the ms sql database. is there any api ?
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Jul 18, 2010
I am quite familiar with web programming (HTML, PHP, MySQL) and semi-familiar with Android Java programming, and would like to begin a project that combines the two together. Can someone point me into the right direction for how I would access/manipulate a web-based MySQL database from an android app?
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Sep 28, 2010
I am new to the development, i have created a database and i have inserted values using eclipse code and i have successes on that But i want to see where this database exists, i have checked on tools directory from command prompt and if i query the table using select , it is saying that no table exists, Can anyone please tell me that how to access database from command line?
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May 11, 2010
I am having trouble accessing the database while I am developing on the phone. Whenever I execute
cd /data/data/com.mycompck/databases
then if I try to run ls I get opendir failed, Permission denied
Or whenever I type in:
sqlite3 I get sqlite3: permission denied
What I am doing wrong?
Are there some applications that can help me getting a human view of content resolvers values and/or SQLite databases?
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Mar 18, 2010
I'm having a problem in accessing a database on remote server from my android application. In some blogs i found that by using Webservices we can do it. but i dont know what are webservices? Can any one help me how do i do that?
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Dec 23, 2009
So far we have developed apps in android that create database on runtime. We like to know how can we access a pre-built or existing database/sqlite file in our android app?
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Jun 30, 2010
how to call BarCodeScanner, and return the value to a field.so now, i have a toast that says "successful scan" and then i want to pass the result to a new activity. when i comment out my intent, everything works (minus the passing of data/switching of screen, obviously) but when i run my project as is, it FC's no errors reported by eclipse in code or xml. any insights?
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