Here is the current scenario:
I have two(2) Android phones.
Android Phone 1 as the server phone.
Android Phone 2 as the client phone.
Here is what I want to do:
I want to create an Android-based app (E.g. Student Information app) where it will have basically two (2) modes:
Server - for adding, editing and deleting data on a local database.
Client - for viewing data from the database of the server.
The app will be installed to Android Phone 1 and set to Server mode.
The app will be installed to Android Phone 2 and set to Client mode.
I want to ask these questions:
I want to locally host the database of the Server app, so that Client app will be able to view the data. Is this possible?
If yes, how can I do it?
Note:
I am currently a web developer so I know that connected on the same network is a requirement.
I have implemented the same concept on a medium business where the web-based system is locally hosted so that computers on the same network can access it.
Suggest everything that you want to suggest, except the disadvantage of doing this concept. I am aware of some obvious disadvantages based from my research and willing to face the disadvantages provided that I will be able to implement the concept.
Rooting the phones is an option.
I want to accommodate small-sized business that is why I want to use Android phones rather than using Desktop Computers/Laptop.
I have read similar suggested questions here based on my title.
We have done the exact same thing in my company. The way we solved this is that the server exposes a service using the Android NSD API, so the clients (using the same API) can find it on the network. And after a client has connected to the server, the server sends its database file (yes, the .db file in /data/data/...) to the client via OutputStream. When the client receives the entire database and checks for its integrity, it copies it to its own /data/data/... and restarts part of the app.
Android NSD
Related
I am planning to make a software which requires two or more databases to be in sync with a main server database ( located on a web server ). Suppose one user have installed my software on more than one computers. Suppose he updates some info on PC-1 then the change should be locally updated and if he is connected with the internet, it should get in sync with the main web server. When he opens the software on PC-2, latest into must be shown there ( assuming he is connected with the internet ).
Now suppose both PC-1 and PC-2 have same data, and both are offline. User deletes the data from PC-1 but don't deletes it from PC-2 ( he assumes it'll get managed automatically ), now when both of the systems go online, the record must be deleted from PC-2 too.
Basically, I am trying to find the database which was most recently updated or modified and sync it with the main database ( on the server ). How can I do it ?
It sounds like you want to synchronize some user data whenever the users or application becomes "online" again.
A couple of suitable services are:
Amazon Cognito Sync is an AWS service and client library that enables cross-device syncing of application-related user data. You can use it to synchronize user profile data across mobile devices and the web without requiring your own backend. The client libraries cache data locally so your app can read and write data regardless of device connectivity status. When the device is online, you can synchronize data, and if you set up push sync, notify other devices immediately that an update is available.
AWS AppSync enables developers to interact with their data by using a managed GraphQL service. GraphQL offers many benefits over traditional gateways, encourages declarative coding style, and works seamlessly with modern tools and frameworks, including React, React Native, iOS, and Android. GraphQL is a data language that was developed to enable apps to fetch data from servers. It has a declarative, self-documenting style. In a GraphQL operation, the client specifies how to structure the data when it is returned by the server. This makes it possible for the client to query only for the data it needs, in the format that it needs it in.
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.
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I'm trying to make an android application that displays tables of sorted data which is stored on a 2008 MS SQL Server. I already thoroughly googled this issue and essentially every person who wanted to connect to a server directly through Android was told they should make a web service which bridges the app with the database server. Problem is, I have no clue how to do that. I only have (v. limited) java/android knowledge.
Instead, I was hoping that the data on the server could somehow be stored locally on the phone and used by the app, instead of connecting to the server directly, which is slow and insecure. (This is a HUGE database we're talking about - 100,000s of entries) Would that be feasible at all?
I have created database in one application and that application is installed in multiple devices.My requirement is that if i change the value in database of one device then,that changes in database should reflect in another device of same application.I need it without server/third api.
Thanks in advance...
This is precisely when one does need a sever.
Stop and consider what it is that you are asking for. You need a way for a phone to notify all other phones that hold the same application about a change. Phones are not directly addressable to each other via the web, which makes any kind of peer to peer algorithm tricky. SMS texts is the closest form of direct addressing that phones do support, thus it could be used to build a peer to peer protocol, but that would be tricky, unreliable and is unlikely to be beneficial.
A server on the other hand is the standard approach to solving this problem, the server acts as a shared agent that all phones that connect to the web can address easily. Even if the server is just an FTP server on a freebie hosting site.
You need to implement a server functionality in your android application.
What is a server : A server is a running instance of an application (software) capable of accepting requests from the client and giving responses accordingly. Servers can run on any computer including dedicated computers, which individually are also often referred to as "the server".
For further information,I would like to provide this link which will clarify you about communication between two devices Android - communicating between two devices (Use of bluetooth etc.)
i am developing an APP in Android which share screen to all android mobile phone connected in a session.
i want to know that android provides any sdk which provides same service like desktop to dektop access as in team View ?
or any Idea, which SDK i have to used?
Thank you.
Smartphones can't directly connect to each others since they are running in different networks. The common way to solve this is an additional server component. All phones need to connect to the server and send their data. The server is pushing this data to other connected clients, probably by using push notifications. In Android Push Notifications are known as C2DM.
Android developers blog:
http://android-developers.blogspot.com/2010/05/android-cloud-to-device-messaging.html
Here's another tutorial on the topic:
http://www.zylinc.com/blog-reader/items/c2dm-a-simple-introduction-using-a-java-server.html
I like 2X RDP a lot. It works very well on phone and tablet and connects to the regular Windows RDP server, so don’t have to install anything else on the server machine.