J1and1 J1and1 - 5 months ago 53
Android Question

BroadcastReceiver when wifi or 3g network state changed

I started do develop an app which will update the database whenever the phone is connected to WiFi. I have implemented a

which will run the
(it will tell me what network is in use), but the problem is I don't know what to add in the manifest file to start
when the network state changes or when it connects to some kind of network

Thank you.

Answer Source

You'll want

<action android:name="android.net.wifi.WIFI_STATE_CHANGED"/>
<action android:name="android.net.wifi.STATE_CHANGE"/>

In your receiver tag.

Or if you want more control over it, before registering BroadcastReceiver set these up:

final IntentFilter filters = new IntentFilter();
super.registerReceiver(yourReceiver, filters);


Broadcast intent action indicating that Wi-Fi has been enabled, disabled, enabling, disabling, or unknown. One extra provides this state as an int. Another extra provides the previous state, if available.


Broadcast intent action indicating that the state of Wi-Fi connectivity has changed. One extra provides the new state in the form of a NetworkInfo object. If the new state is CONNECTED, additional extras may provide the BSSID and WifiInfo of the access point. as a String

Also, you'll need to specify the right permissions inside "manifest" tag:

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />

To check connectivity, you can use ConnectivityManager as it tells you what type of connection is available.

ConnectivityManager conMngr = (ConnectivityManager)this.getSystemService(this.CONNECTIVITY_SERVICE);
android.net.NetworkInfo wifi = conMngr.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
android.net.NetworkInfo mobile = conMngr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
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