Question

I’ve written a BackupAgent to backup my data, but I want to enable the backup only when WiFi is connected and not GPRS/3G/4G. Can I control that programmatically ?

Answer 1

Wifi State can always be known as follows :

1) Get a WifiManager object using the method Context.getSystemService(Context.WIFI_SERVICE)

2) Use the
isWifiEnabled class to know the state of Wifi.

To know the status of Data Connectivity of Cellphone, get an Instance using
TelephonyManager tm = Context.getSystemService(Context.TELEPHONY_SERVICE), and then use

tm.getDataState to know the status of data connectivity.

Now, run your BackupAgent when the return value of getDataState is TelephonyManager.DATA_DISCONNECTED and the return value of isWifiEnabled is true.

To be able to disable the backup once the connection (3G/WiFi) is dropped , create a new method is follows :

enter code here  
protected void checkMyConnectivity()


{

if (tm.getDataState ==  TelephonyManager.DATA_DISCONNECTED && wm.isWifiEnabled==true)

return true;

else

return false;

}`

And use this code whenever you want to check the connectivity and if the return value is false, stop the upload. If you want to be very specific, use a while loop instead.