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  • Android device guidelines/requirements

    - by Ravi Vyas
    Are there any requirements/guidelines for an Android device? like numbers of buttons or minimum buttons required. Also are there any android devices which do not have the menu and back buttons? ( I am aware that no menu/back buttons will kill most of the apps in terms of usability , I just wanted to know more on the topic :-) )

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  • Launching and Intent from file and mime type

    - by stonedonkey
    I've reviewed all the similar questions here, but I can't for the life of me figure out what I'm doing wrong. I've written an application that tries to launch various files, sort of a file browser, when a file is clicked it tries to launch the program based on it's associated MIME type or I want it to present the "Choose Application to Launch" dialog. Here's the code I'm using to launch: File file = new File(app.mediaPath() + "/" +_mediaFiles.get(position)); Intent myIntent = new Intent(android.content.Intent.ACTION_VIEW); String extension = android.webkit.MimeTypeMap.getFileExtensionFromUrl(Uri.fromFile(file).toString()); String mimetype = android.webkit.MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension); myIntent.setDataAndType(Uri.fromFile(file),mimetype); startActivity(myIntent); This fails and generates a: android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.intent.action.VIEW dat=file:///file:/mnt/sdcard/roms/nes/Baseball_simulator.nes } Now if I install OI File Manager for instance, it opens instead of this error being thrown, and then if I click the same file from within in it, it launches the approriate dialogs. I have noticed that the MIME type for that particular file fails, but other mime types like .zip do return values. Am I missing something that when the MIME type is null to call a dialog that lets the user select? I've tried other variations of launching the app, including not setting the mime type and only using .setData with no success. The action I want to happen is, a user clicks a file, if it's associated with an application that app launches, if not, the user gets the "Complete action using" dialog with a list of apps. Thanks for any advice.

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  • iPhone to Android Market

    - by BahaiResearch.com
    (I am coming from an iPhone experience) When we create an iPhone app, Apple gives us a http URL that we can put on web pages that when clicked will open iTunes and give the user a chance to buy on their desktop. As Android has no "iTunes" Windows/Mac application on the desktop, what do I link to on my Web pages/email marketing so that users can go and buy the Android apps we are writing? Ian

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  • Using static variable in android

    - by michael
    Hi, In android, is it recommend to use static variable? E.g, implement a Singleton pattern in Java, I usually do: private static A the_instance; public static A getInstance() { if (the_instance == null) { the_instance = new A(); } return the_instance; } My question is when do that get free by android JVM? Thank you.

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  • Which is a better design pattern for a database wrapper: Save as you go or Save when your done?

    - by izuriel
    I know this is probably a bad way to ask this question. I was unable to find another question that addressed this. The full question is this: We're producing a wrapper for a database and have two different viewpoints on managing data with the wrapper. The first is that all changes made to a data object in code must be persisted in the database by calling a "save" method to actually save the changes. The other side is that these changes should be save as they are made, so if I change a property it's saved, I change another it's save as well. What are the pros/cons of either choice and which is the "proper" way to manage the data?

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  • Design Advice Needed For Synonyms Database

    - by James J
    I'm planning to put together a database that can be used to query synonyms of words. The database will end up huge, so the idea is to keep things running fast. I've been thinking about how to do this, but my database design skills are not up to scratch these days. My initial idea was to have each word stored in one table, and then another table with a 1 to many relationship where each word can be linked to another word and that table can be queried. The application I'm developing allows users to highlight a word, and then type in, or select some synonyms from the database for that word. The application learns from the user input so if someone highlights "car" and types in "motor" the database would be updated to link the relationship if it don't exist already. What I don't want to happen is for a user to type in the word "shop" and link it to the word car. So I'm thinking I will need to add some sort of weight to each relationship. Eventually the synonyms the users enter will be used so they can auto select common synonyms used with a certain word. The lower weight words will not be displayed so shop could never be a synonym of car unless it had a very high weight, and chances are nobody is going to do that. Does the above sound right? Can you offer any suggestions or improvements?

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  • Multiple database support in django.

    - by codebreak
    From some forum I came to know that Multiple database support is added in Django at lower level, but the higher level apis are not added yet. Can anyone please tell me how one can achieve multiple database connections in Django. Does anyone have any idea by when Django will fully/officially support Multiple database connections.

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  • C#, Manage concurrency in database access

    - by Goul
    Hi there, I have written a while ago an application used by multiple users to handle trades creation. I haven't done development for some time now and can't remember how I managed the concurrency between the users and so would have liked your advices in term of design. The application was as follow: - One heavy client per user - A single database - Access to the database for each user to insert/update/delete trades - A grid in the application reflecting the trades table. That grid being updated each time someone changes a deal. My questions: 1- Do you confirm I shouldn't care about the connection to the database for each application. Considering that there is a singleton in each, I would expect on connexion per client with no issue. 2- How preventing the concurrency of the accesses? I guess I should lock when modifying the data, however don't remember how to. 3- How to have the grid automatically updated whenever the database is (by another user for example)? Thank you in advance for your help!

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  • android tag editor

    - by GatesReign
    It is my first time building an android app. Was wondering firstly, if there are demos that exists which could help me to build a media tag editor (form to edit mp3 files). I would also like to know how to populate the sd card on the emulator. Any help on android would be good. Thanks all!

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  • Database Insider - November 2012 issue

    - by Javier Puerta
    The November issue of the Database Insider newsletter is now available. (Full newsletter here) Mark Hurd: Oracle Database Wrap-up from Oracle OpenWorld 2012 Oracle executives kicked off Oracle OpenWorld 2012, discussing the needs of customers, the brand-new Oracle Exadata Database Machine X3, and the latest Oracle Database innovations. (Read More) Webcast: Introduction to Oracle Exadata Database Machine X3 Oracle’s next-generation database machine, Oracle Exadata X3, combines massive memory and low-cost disks to deliver the highest performance at the lowest cost. Available in an eight-rack configuration, it allows you to start small and grow. Webcast: SAP Applications Run Better on Oracle Exadata Find out why a growing number of SAP application customers are turning to Oracle Exadata Database Machine for better performance, better productivity—and big savings. 

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  • Displaying conditional amount of fields in UI (Android)

    - by Sochin
    I am using layout xml documents for my ui controls. I need to create and remove these controls (input fields) on the fly, based on how many results I get back from my database. For each group, there can be 0..* fields and these are prepopulated from the database. Also, it would be good if I can invoke a method to create an additional field; something like the address book, where you can click + or - to add or remove a phone or other detail. In a "psuedo" style, I'm guessing something like this: Check database - How many of X are there [y]? Create Y fields. The user may then add new fields, so once I click submit i need to apply all of that to database. Any examples or hints greatly welcomed. Hope this make sense! :)

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  • Android Device Management

    - by Jon Hopkins
    I'm looking at the possibility of using Android as a secure corporate mobile platform. One of the pre-requisites for this will be a way of managing multiple devices, security policies, software deployment, that sort of thing - essentially the things the BlackBerry Enterprise Server handles for BlackBerry or MDM (or something 3rd party like SOTI) handles for Windows Mobile. Does such a thing exist for Android? It's a platform we're interested in but without this right now (and we're not in a position to build it ourselves) it's a non-starter.

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  • android bluetooth

    - by yoavstr
    can someone explain to me the concept behind using bluetooth my project in my studies is to make an android app using bluetooth, SQLLIGHT and google app the app itself is a very easy one but i just dont get the tools i need to use : how does the bluetooth works? is there a simple example ? the concept behind android GUI (i allready nade one but i think i am not fully understood his power)? note : i am using v 2.1

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  • Database design: one huge table or separate tables?

    - by littlegreen
    Currently I am designing a database for use in our company. We are using SQL Server 2008. The database will hold data gathered from several customers. The goal of the database is to acquire aggregate benchmark numbers over several customers. Recently, I have become worried with the fact that one table in particular will be getting very big. Each customer has approximately 20.000.000 rows of data, and there will soon be 30 customers in the database (if not more). A lot of queries will be done on this table. I am already noticing performance issues and users being temporarily locked out. My question, will we be able to handle this table in the future, or is it better to split this table up into smaller tables for each customer?

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  • Export from a standalone database to an embedded database.

    - by jdana
    I have a two-part application, where there is a central database that is edited, and then at certain times, the data is released and distributed as its own application. I would like to use a standalone database for the central database (MySQL, Postgres, Oracle, SQL Server, etc.) and then have a reliable export to an embedded database (probably SQLite) for distribution. What tools/processes are available for such an export, or is it a practice to be avoided? EDIT: A couple of additional pieces of information. The distributed application should be able to run without having to connect to another server (ex: your spellchecker still works even you don't have internet), and I don't want to install a full DB server for read-only access to the data.

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  • Updating table from async task android

    - by CantChooseUsernames
    I'm following this tutorial: http://huuah.com/android-progress-bar-and-thread-updating/ to learn how to make progress bars. I'm trying to show the progress bar on top of my activity and have it update the activity's table view in the background. So I created an async task for the dialog that takes a callback: package com.lib.bookworm; import android.app.ProgressDialog; import android.content.Context; import android.os.AsyncTask; public class UIThreadProgress extends AsyncTask<Void, Void, Void> { private UIThreadCallback callback = null; private ProgressDialog dialog = null; private int maxValue = 100, incAmount = 1; private Context context = null; public UIThreadProgress(Context context, UIThreadCallback callback) { this.context = context; this.callback = callback; } @Override protected Void doInBackground(Void... args) { while(this.callback.condition()) { this.callback.run(); this.publishProgress(); } return null; } @Override protected void onProgressUpdate(Void... values) { super.onProgressUpdate(values); dialog.incrementProgressBy(incAmount); }; @Override protected void onPreExecute() { super.onPreExecute(); dialog = new ProgressDialog(context); dialog.setCancelable(true); dialog.setMessage("Loading..."); dialog.setProgress(0); dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); dialog.setMax(maxValue); dialog.show(); } @Override protected void onPostExecute(Void result) { super.onPostExecute(result); if (this.dialog.isShowing()) { this.dialog.dismiss(); } this.callback.onThreadFinish(); } } And in my activity, I do: final String page = htmlPage.substring(start, end).trim(); //Create new instance of the AsyncTask.. new UIThreadProgress(this, new UIThreadCallback() { @Override public void run() { row_id = makeTableRow(row_id, layout, params, matcher); //ADD a row to the table layout. } @Override public void onThreadFinish() { System.out.println("FINISHED!!"); } @Override public boolean condition() { return matcher.find(); } }).execute(); So the above creates an async task to run to update a table layout activity while showing the progress bar that displays how much work has been done.. However, I get an error saying that only the thread that started the activity can update its views. I tried doing: MainActivity.this.runOnUiThread(new Runnable() { @Override public void run() { row_id = makeTableRow(row_id, layout, params, matcher); //ADD a row to the table layout. } } But this gives me synchronization errors.. Any ideas how I can display progress and at the same time update my table in the background? Currently my UI looks like:

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  • Can't exit an Android application

    - by saravanan
    // @Override public boolean onOptionsItemSelected(MenuItem item) { // TODO Auto-generated method stub switch(item.getItemId()) { case EXIT: try { this.finish(); } catch(Exception e) { } break; } return false; } When I exit my android application it resumes the previous screen. How can I exit the Android application properly?

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  • How many android apps are open source?

    - by Alex
    I know that the android plattform is open source. What I am interested in is the share of open source Android apps, thus developers that realease their own apps under a open source license. Does anybody have an idea, how to get this information?

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  • Why my java app for android not connect to server?

    - by FredVaz
    Why my java app for android not connect to server ? I run the aplication in android emulator, and the server wich port 9999 and host 127.0.0.1 in my pc, but just not connect and i think this method isn't good for android app. It is my source code: import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; //Java imports //import android.util.Log; import java.io.*; import java.net.*; import java.util.*; import java.util.logging.Level; import java.util.logging.Logger; public class MainActivity extends Activity { //Variaveis Interface private Button ligar; private Button enviar; private EditText text1; private TextView text2; //Variaveis static Socket cSocket; static PrintWriter out; static BufferedReader in; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //Declaração butões ligar = (Button) findViewById(R.id.ligar); enviar = (Button) findViewById(R.id.enviar); text1 = (EditText) findViewById(R.id.text1); text2 = (TextView) findViewById(R.id.text2); //Interacao ligar.setOnClickListener(new OnClickListener(){ public void onClick(View arg0){ connect(); } }); enviar.setOnClickListener(new OnClickListener(){ public void onClick(View arg0){ out.println("Hello"); text2.setText(""); } }); } //Outras Funcoes public void connect(){ //Funcao ligar cSocket = null; out = null; in = null; try { cSocket = new Socket("127.0.0.1",9999); out = new PrintWriter(cSocket.getOutputStream(), true); in = new BufferedReader(new InputStreamReader(cSocket.getInputStream())); text2.setText("Estas conectado com sucesso."); } catch (IOException ex) { //Logger.getLogger(client.class.getName()).log(Level.SEVERE, null, ex); text2.setText("Erro! Na conexão"); } } // }

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  • Creating Simple desktop database application

    - by KoolKabin
    Hi guys, I am here to write a small database application that will be running in desktop (offline mode). I am using MSAccess 2007 as my database file and trying to write code in vb.net. I used to write the code vb6 an usually had global variables for storing database connection and executing every query from that. I am trying to upgrade myself from vb6 to vb.net. do i need to read some more simple starter books also?

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