Ok so I'm trying to develop a server for an android app that I'm developing.
Basically it's an application that needs to connect with other phones through a database system.
I was thinking of using an sql database to store the simple data I need to exchange.
What type of server should I be using?
What language should I be writing the database code in (if besides SQL)?
How do I get the android application to communicate and exchange information with the database?
Is there a type of virtual server I can use to test my app?
The server type and language choices very much depend on your skillset and environment. However, I'd suggest exposing queries to your database either through JSON or XML, and presenting through a web server.
PHP & MySQL are as good a choice as any, as you can run the same code on UNIX, Linux, Solaris, or MacOS servers. Of course, using a J2EE environment with JDBC drivers to a generic server is also a good choice, especially if you need to share any classes between Android and your server.
By 'virtual server' I assume you mean 'virtual handset', in which case the Android emulator in the SDK might be good enough (although it is painfully slow), or just use a real Android device plugged in to your development machine.
Hope this helps,
Phil Lello
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I'm working on a Project which aims to develop an app for a bloomberg anywhere subscriber. We have a Framework available, which we usually use to write our apps. These run ususally on a cloud as webapplications.
As apps using bloombergs open API can only run on the same machine as the subscriber is logged in biometrically, due to data acess restrictions and prohibition to distribute the data further, we plan to run our framework locally on the clients machine as a desktop application, in order to use the tools we are familiar with.
the back-end, which would use the bloomberg open api to get the data from the local interface provided by the local bloomberg-software, runs on a tomcat-server. the frontend is a javascript client, accessing the back end via API-calls locally.
My Questions are:
As bloomberg data-access is very restrictive, i'm wondering whether the bloomberg-interface accepts calls which come from a server software (like tomcat), even when running on the same machine an not used to distribute the data further?
Would set-up: framework running on a second machine (linux, its easyer to run there), calls Bloomberg Port on first machine via private local network, data not leaving second machine, be possible 1. technically and 2. legally?
Does anybody know that? Any advice highly appreciated, many thanks in advance!
I am just a beginner in android app development and that's why I have many doubts. I am building one application where the user enters some data in editText. Now I want to save that data in my database. My database is running on my laptop. How would my app connect to the database? Do I need a web server in between? If yes then which web server is used for Android apps? Basically, i want to know the flow of data from app to the database.
Study more from Udacity.com, its free.
You may use a jdbc Connector to connect to database.
Connect your jdbc connector over local network ip\servername and database connection string
You can use REST Service when it comes to web Service on Android like this. You can either pass the values as parameters or an Object depending on your requirement. All the best
Wamp server is best option to play with server related utilities.You can use it even if you are offline. and it provides various option for data storage. It Mainly uses MySql and PHP scripts for fast performance.
For More details Click Here
I am working on a project where the raspberry pi (model B) runs JAVA application to connect to and retrieve data from a Router.
What i want to know is the best approach or the best database that i should use to store that data retrieved from the router. Knowing that i will need to build another android application that should connect to that database (on the raspberry pi) and display that data.
So, what database that is compatible with the java application and the android application?
Also, later on i wish i could run the RPI as a server that enables me to connect to that database from anywhere.
Keeping in mind that:
I am new to Raspberry pi
New to Database
I suggest you to take a look at OrientDb is a NoSql Java graph-document db (you can chose) it support a lot of queries paradigm and an Sql dialect as well (you dont have the join), is fast, light, and support native rest query, i have tested it on raspberry pi (even in distributed multi-master mode on 2/3 raspberry node) and it perform well, the nice thing is that allow you to think in a different way, your data is presented like a java object an exposed you by rest paradigm in Json over http so you can think your client application on client side, using html 5 and jscript framework like angularJs for example (and you can 'deploy' your static resource direcly on the db that work like an extremly light application server)
This answer follows the previous comments. Let's say :
You have your router. Connected to it you have PC (with IP address called IP1) and your RPI with IP2.
On your RPI, I guess you have RaspBian. So with the package manager, you install mysql. You create your desired database and tables.
When using eclipse to access your database for testing purpose, or explore all data, I think you need to provide the jdbc driver, and configure the url of the db. Because you are running eclipse on your pc and you want to access the db hosted by the RPI, you should provide the IP2 address in the url.
Because your Java app will run on RPI, you can set the url to "localhost". See the following link : http://dev.mysql.com/doc/refman/5.0/en/connector-j-reference-configuration-properties.html
So, to sum up, eclipse and java app both need a mysql jdbc driver, configured the right way.
Later, you'll want to access your db through your android app. You'll need to configure your router with port forwarding, to access your db from outside. But this is out of topic. I let you search.
Almost All the Databases are Compatible with JAVA.And Hardly I belive that you will not have such privilege to choose Database while develop real time Application .
Java and Android Both are not different , both are same on a Pillar.There will be no problem because of using Database.
i suggest SQLite as Android uses it natively and it does not need that much of resources as other DBMS like *SQL
I would like to be able to control a USB device from a web application.
I was hoping to use Adobe Flex but I don't think that Flex can support access to USB devices.
Is this possible using Java applets, or a similar approach using .NET?
Thanks.
I don't think any web client platform will allow this. On purpose.
If you find one that does, I will uninstall from all my machines.
With .NET, you could
Create a WinForm control and host it in IE with an object tag. This requires security settings to be set using CASPOL or ActiveDirectory, but you would have full-trust to the machine after this
http://weblogs.asp.net/spano/archive/2007/09/19/hosting-a-windows-form-control-in-a-web-page.aspx
If there is already a COM object on the machine that does what you need, you can access it via Silverlight with elevated permissions.
http://www.silverlightshow.net/items/Silverlight-4-elevated-permissions.aspx
With Applets, you could do it with a trusted applet.
Using a lot of different technologies, you could create ActiveX objects, plugins or browser extensions to do it.
We successfully connected POS devices with a Flex UI... for this we created a bridge application with Merapi which connects Flex (either Air or Web) with Java, and left the connection with the devices to Java... this was for a controlled environment where we where sure that the client had the bridge configured...
Other option is to try Air 2.0 which allows to execute Native code (e.g. Java) to connect to the devices, and you could release your app in Air or develop a bridge this time in Air instead of Java to connect with the browser app
HTH
Gus
Your question is a little unclear because you did not say what computers the web application is running on, what computer the USB device is on, and what computer is yours.
Depending on the details, one possible solution would be to write a Chrome Packaged App and use Chrome USB API. The app would need to be installed on the computer that has the USB device and then it could present a UI to the user or just connect to a remote server and allow the device to be controlled remotely.
I am making an Android application. Since it is so simple, I first thought I could simply eliminate the need for Java application on the server which acts as a middleware. I tried directly connecting to the database using the JDBC driver for MySQL but my program is crashing so I'm not sure if Android "supports" the JDBC driver for MySQL.
So I am thinking of how to implement the application. Basically the application writes some data from a remote MySQL database and retrieves some data from a remote MySQL database.
Do I connect to a Java server program using sockets (or some other method of communication)? Or could I implement a direct connection to the MySQL database from the client application?
I tried directly connecting to the
database using the JDBC driver for
MySQL but my program is crashing so
I'm not sure if Android "supports" the
JDBC driver for MySQL.
Never never never use a database driver across an Internet connection, for any database, for any platform, for any client, anywhere. That goes double for mobile. Database drivers are designed for LAN operations and are not designed for flaky/intermittent connections or high latency.
Do I connect to a Java server program
using sockets (or some other method of
communication)?
It doesn't have to be Java. It just has to be something designed for use over the Internet. As Mr. King's comment suggests, Web services have been used for this for much of the past decade. For Android, REST Web services are probably the easiest to consume, since there is no built-in support for SOAP or XML-RPC. But whether the Web service is implemented in Java, or PHP, or Perl, or SNOBOL, is up to you.
Well, OK, perhaps SNOBOL won't be a viable option. :-)
I know this might be a little late but as I ran into the same problem with a project at school I wanted to share my solution with you as you might profit out of my experiences.
Android is bad for Database-Operations so creating a normal Database-Controller wasn't a thing. Instead I created a Server in Java which handles all Database-related stuff and can also be extended (in my case I used a Feedback-function, too).
The Github-REPO is: https://github.com/Cedced-Bro/Public-Server You can check it out and this is open-source so you can use and contribute to it if you have more ideas to it.
To answer your question more properly: I would strongly suggest to NOT grant all users direct access to your DB as you can run into security issues with malicious users. This was the reason why I created this controller in the first place instead of just a PHP "forwarding"-server.