I am trying to build an application/service that will execute some coding everytime I connect to a specific wifi network (to log into that network and then keep the connection active ). I do already have the code for the login part and it is working fine, but I don't really know how I can automatically run this code when I connect to a network.
Ideally, I would like to build a service that starts when I join a specific wifi network, keeps the connection active (like makes a request every 10 min to keep the connection active) and finally stops when I leave that network.
I know how to build the service and keep it active, but don't know how to start and stop it automatically when joining / leaving a wifi network. Any suggestions on how to do this is appreciated. If my approach is not correct and there is a better/simpler way to do that, please let me know
Regards,
Marcel
you need a broadcast receiver.
this broadcast receiver will receives broadcasts of Wifi connected and wifi disconnected actions and from there you can start and stop your service.
Implement a BroadcastReceiver listening for the scan results from WifiManager.startScan()
Have a look at Android Scan for Wifi networks
Related
As the title says, I'm wondering if the there is some way in Android for listen to network connections. Something like using a service that is registered to handle the SMS messages that, for example, we can consume the SMS and broadcast or not that SMS.
The idea is that my app will sit on the background and be notified when some app makes a network connection. Based on some rules, my app can decide if this network connection will be denied or allowed.
As an example, suppose an app tries to connect to the Wireless network with SSID "netA". My app would be notified and if the rule is to deny this app on "netA" the calling app would not be able to connect to the network.
Any idea if this is possible?
Why don't you use a Broadcast recevier that listen for some events?.
It seems to me from your description that you don't need a Service, that is a android component that runs long time task, but something that listens to events.
Give a look here
I want to write an android service at is activated when the internet connection goes down, and displays another activity to user when that happens. I don't know how to start to write this service. Can any one give me an idea or better tutorial how to catch the connection down within Android service.
Thanks
When Internet connectivity changes, the system sends out a broadcast with an android.net.conn.CONNECTIVITY_CHANGE intent. You should be able to create a broadcast receiver that will be called whenever the device is connected or loses its connection.
You've to write a receiver for the connection changes.
You can look right here : Android, How to handle change in network (from GPRS to Wi-fi and vice-versa) while polling for data
i'm writing a client-server application which uses TCP socket connection. In my android project, Service creates a thread for listening the TCP socket.
Everything seems OK. But i have got one problem.. My network service running in background fine; But some time later (10-15 min..), when i try to open my application (main activity) again, I can't get responses from the socket connection. It freezes or something?? i cant send or get TCP messages from the socket.. What can be the reason of this? I'm working on my phone, via 3G connection.
(Besides, the app running in the emulator hasn't got such this problem; I assume Its connection is stable, long-during )
Thank you for your answering.
Due to power optimizations and perhaps changes in connectivity (GPRS/HSDPA/Wifi) it's very likely your connection is being dropped.
In order to maintain a connection, your background service needs to claim a wakelock using the PowerManager class. This prevents the device from going to power-saving mode and thus disconnecting your socket. But beware, this significantly lowers the battery life of the device.
Also, you need to handle changes in connectivity which break your open connection. Android sends out a broadcast message named android.net.conn.CONNECTIVITY_CHANGE to notify of changes in connectivity.
Depending on your use-case I would poll with when the device is in the sleep-mode and only build a connection when the device is actively in use or just use C2DM push notifications
When I have experienced something like this in my apps, it has usually been because of power optimisations on the phone (which cant be overridden). If the socket has been idle for too long, it is automatically closed and needs to be reopened.
Are you sending data from time to time? Like implementing a heartbeat protocol ? if you are not, you should...or maybe it has to do with socket READ/WRITE TIMEOUT
Like many apps my app depends on WIFI and Http Connection to operate. What I am not clear on is how I can time a wait until WIFI is enabled AND device is attached to WIFI network is. What is the best way to delay on application startup long enough for this to happen? during this time I would for example keep buttons deactivated. Also is there any way to make the device attempt to connect to its preferred network? Thanks
Take a look at ConnectivityManager and WiFiManager. Using these you can get events when network state changes
Use WifiManager to get the state of the connection.
Generally you will have to try. A Wifi connection can show as connected but not be able to actually send/receive because the signal is too weak. Once the connection is up, the app should try connecting and only when it succeeds, the buttons should be activated and so forth.
Iam connection to services trougth my app, I woul like to check if the connections gets broken, alert a message than.
Or is this taken carre of in android?
If not, How should I take care of it? is there a timer?
If you are connecting to built-in services of Android, for example Connection with GPRS, WIFI or MOBILE 3G connection, then you can register a Broadcast Receiver that will tell the user when the connection is lost.
But if you are connecting to your custom-made services, for example ABC Application, then you would have to make your own service, that will periodically (example every 15mins) will check the connectivity with ABC Application. Hope this helps.